Phosphorus (P)

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Grain Legumes
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Nutrient and Soil Amelioration
Nitrogen
Phosphorus
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SUM20.GP1: GRDC NPK Projects - P Rates in Scepter Wheat, Moorine Rock
sum20-gp1-grdc-npk-projects-p-rates-in-scepter-wheat-moorine-rock
-31.555208
119.192011
This trial is part of a series of trials contributing to GRDC Project UWA1801-002RTX looking at ‘profit from N, P and K fertilizer inputs into the evolving cropping sequences in the Western Region.
trial-show
2020
Phosphorus
SUM20.GK1: GRDC NPK Projects – K Rates, Source and Placement for Canola, Muntadgin
sum20-gk1-grdc-npk-projects-k-rates-source-and-placement-for-canola-muntadgin
-31.736736
118.659525
We assess the importance of potassium (K) placement as either MOP or SOP at increasing rates on canola at a sandy clay loam site east of Muntadgin.
trial-show
2020
Potassium
SUM20.33: Apex Yield Series – Strategic Nitrogen Rates & Timing for Wheat on Heavy Loam Soil, Mingenew
sum20-33-apex-yield-series-strategic-nitrogen-rates-timing-for-wheat-on-heavy-loam-soil-mingenew
-29.2604
115.616176
This trial assesses a number of nitrogen application strategies with increasing rates to match site conditions and Scepter wheat yield potential at a loamy site south east of Mingenew.
trial-show
2020
Nitrogen
SUM20.32: Apex Yield Series - Strategic Nitrogen Rates & Timing for Wheat on Sandy Soil, Mingenew
sum20-32-apex-yield-series-strategic-nitrogen-rates-timing-for-wheat-on-sandy-soil-mingenew
-29.351062
115.37915
This trial assesses a number of nitrogen application strategies with increasing rates to match site conditions and Scepter wheat yield potential at a sandy site south west of Mingenew.
trial-show
2020
Nitrogen
SUM20.28: Nitrogen x Phosphorus Rates to Support Scepter Wheat Production, Tammin
sum20-28-nitrogen-x-phosphorus-rates-to-support-scepter-wheat-production-tammin
-31.627523
117.594367
This trial assesses the response of wheat under a factorial nitrogen (N) and phosphorus (P) fertilizer application trial design in the Tammin area.
trial-show
2020
Phosphorus
Nitrogen
SUM20.27: Establishment Phosphorus Compounds and Nutrient Supply for Wheat Crop Production – Large Plot Trial, Yornaning
sum20-27-establishment-phosphorus-compounds-and-nutrient-supply-for-wheat-crop-production-large-plot-trial-yornaning
-32.72867
117.216533
We investigate the agronomic response of Magenta wheat to various rates and compounds of P fertilisers in a scaled-up plot trial
trial-show
2020
Phosphorus
SUM20.25: Implications of P for Barley on High PBI Soil, Year 1 – Yield Response and Seed Nutrient Accumulation, Boyup Brook
sum20-25-implications-of-p-for-barley-on-high-pbi-soil-year-1-yield-response-and-seed-nutrient-accumulation-boyup-brook
-34.030574
116.501232
Varying levels of nutrition were applied so that seed can be analysed and retained for use next year to assess the performance of varying seed nutrition levels. This trial hopes to provide further insight for improving on-farm P management.
trial-show
2020
Phosphorus
SUM20.30: Form and Efficacy of Manganese Supply to Coromup Lupins, Regans Ford
sum20-30-form-and-efficacy-of-manganese-supply-to-coromup-lupins-regans-ford
-30.873215
115.718982
This trial aims to assess the long-term response and carryover effect of manganese (Mn) fertiliser at a sandy soil site north of Regans Ford.
trial-show
2020
Phosphorus
Other
SUM20.17: Nitrogen x Phosphorus Rate Interactions in Winter Wheat (Illabo), Muntadgin
sum20-17-nitrogen-x-phosphorus-rates-interactions-in-winter-wheat-illabo-muntadgin
-31.844615
118.662261
This trial investigates the interactions between increasing nitrogen (N) and phosphorus (P) interactions on Illabo wheat. At a sandy loam site south east of Muntadgin we aim to improve understanding of N and P importance in yield and grain quality and begin to elucidate nutrient response behaviour in winter wheats with their distinct growth habits.
trial-show
2020
Phosphorus
Nitrogen
SUM20.16: Potassium and Phosphorus Rate Interactions for Wheat Production, Moorine Rock
sum20-16-potassium-and-phosphorus-rate-interactions-for-wheat-production-moorine-rock
-31.55521
119.192121
This trial investigates the interactions between increasing phosphorus (P) and potassium (K) interactions on wheat at a sandy loam site south of Moorine Rock. With hope to increase understanding and refinement of P and K application rates and importance in wheat yield and grain quality.
trial-show
2020
Phosphorus
Potassium
SUM20.15: Nitrogen x Phosphorus rates to support Spartacus Barley Production, Merredin
sum20-15-nitrogen-x-phosphorus-rates-to-support-spartacus-barley-production-merredin
-31.630156
118.143697
This trial assesses the response of barley under a factorial nitrogen (N) and phosphorus (P) fertilizer application trial design in the Merredin area to increase recognition of the value of optimal N and P to barley yield, grain quality and profitable returns.
trial-show
2020
Phosphorus
Nitrogen
SUM20.14: Potassium and Phosphorus Rate Interactions for Noodle Wheat production, Nungarin
sum20-14-potassium-and-phosphorus-rate-interactions-for-noodle-wheat-production-nungarin
-31.205428
117.994797
This trial investigates the interactions between increasing phosphorus (P) and potassium (K) interactions on a noodle wheat at a sandy clay loam site south west of Nungarin. With hope to increase knowledge of P and K importance in wheat yield and grain quality.
trial-show
2020
Phosphorus
Potassium
SUM20.13: Factorial Nitrogen x Phosphorus rates to support Spartacus Barley Production, Mukinbudin
sum20-13-factorial-nitrogen-x-phosphorus-rates-to-support-spartacus-barley-production-mukinbudin
-30.773026
118.231809
This trial assesses the response of barley under a factorial nitrogen (N) and phosphorus (P) fertilizer application trial design in the Mukinbudin area to increase recognition of the value of optimal N and P to barley yield, grain quality and profitable returns.
trial-show
2020
Nitrogen
Phosphorus
SUM20.10: Effect of Sowing Time and Conditions on Wheat P Requirements, Northam
sum20-10-effect-of-sowing-time-and-conditions-on-wheat-p-requirements-northam
-31.560422
116.76954
We aim to assess the response of Scepter and RockStar wheat to increasing rates of applied phosphorus (P) when sown at different times during the sowing window in the Northam area.
trial-show
2020
Phosphorus
SUM20.07b: Effects of Seed Manganese Concentration in Lupins, Eradu
sum20-07b-effects-of-seed-manganese-concentration-in-lupins-eradu
-28.839
115.1
This trial aims to utilise seed retained from SUM19.19 to assess the growth and performance of Barlock and Jurien lupin seed with different manganese (Mn) concentrations on a low Mn status sandy soil south of Eradu.
trial-show
2020
Other
SUM20.07a: Form and Efficacy of Manganese Supply to Lupin Varieties, Eradu
sum20-07a-form-and-efficacy-of-manganese-supply-to-lupin-varieties-eradu
-28.836753
115.150005
This trial aims to assess the response of Barlock and Jurien lupins to manganese (Mn) fertilizer on sandy soils south-east of Eradu, while also assessing the efficacy of various chemical forms of Mn fertilizer, with hopes to provide further insight into the decision making when using Mn sources at seeding.
trial-show
2020
Other
SUM20.02: Potassium Rates, Source and Placement, Year 1, Wheat, Badgingarra
sum20-02-potassium-rates-source-and-placement-year-1-wheat-badgingarra
-30.480422
115.713934
Progressively increasing K rates to optimise returns poses questions of contemporary crop tolerance to chloride (Cl-) associated with muriate of potash (MOP) compared with sulphate of potash (SOP) sources. This trial assesses the importance of K placement as either MOP or SOP, on wheat in 2020, at a sandy site east of Badgingarra at rates designed to run-down, maintain and potentially build K soil reserves over time.
trial-show
2020
Potassium
SUM20.23: Apex Yield Series – High end Nitrogen, Phosphorus and Potassium Rates for Wheat, Corrigin
sum20-23-apex-yield-series-high-end-nitrogen-phosphorus-and-potassium-rates-for-wheat-corrigin
-32.283108
117.748968
Summit have instigated a trial series to allow maximum yield potential expression of contemporary crop varieties by removing all nutrient limitations. This trial investigates the interactions between nitrogen (N), phosphorus (P) and potassium (K) rates on Scepter wheat grain production at a sandy clay loam site north west of Corrigin.
trial-show
2020
Nitrogen
Phosphorus
Potassium
SUM19-13: N Rates, N-Calc Recommendations & Cereal Varieties, Morawa Agricultural College Site
sum19-13-n-rates-n-calc-recommendations-cereal-varieties-morawa-agricultural-college-site
-29.2166
115.9925
Aim: To assess the response of Barley, Oat & Wheat varieties to applied nitrogen (N) fertilizer.
trial-show
2019
Nitrogen
SUM19-24: Potassium Strategies for wheat, Goomalling
sum19-24-potassium-strategies-for-wheat-goomalling
-31.1322
116.6616
Aim: To assess the response of wheat to applied potassium (K) rates, sources and placement.
trial-show
2019
Potassium
SUM19-25: Nitrogen x Phosphorus Rates, Goomalling.
sum19-25-nitrogen-x-phosphorus-rates-goomalling
-31.1324
116.6166
This trial investigates the response of wheat to applied nitrogen (N) and phosphorus (P) rates to determine a recommended fertilizer regime for local growers that maximises yield and profitability.
trial-show
2019
Nitrogen
Phosphorus
SUM19-11: Factorial Phosphorus x Potassium Rates in wheat, Mukinbudin
sum19-11-factorial-phosphorus-x-potassium-rates-in-wheat-mukinbudin
-30.989555
118.16972
To evaluate the response of wheat to phosphorus (P) and potassium (K) fertilizer application at a sandy loam site south of Mukinbudin
trial-show
2019
Nitrogen
Phosphorus
Potassium
SUM19-03: Nutrition for high-end wheat production on ameliorated soil east of Esperance
sum19-03-nutrition-for-high-end-wheat-production-on-ameliorated-soil-east-of-esperance
-33.73220556
122.99055
To investigate high-end cereal nutrient growth response capacity after removal of soil constraints. Particularly evaluating how wheat responds to nitrogen (N), phosphorus (P) and potassium (K) fertilizer application.
trial-show
2019
Nitrogen
Phosphorus
Potassium
Nutrient and Soil Amelioration
SUM19-04: Nutrition for high-end canola production on ameliorated soil, east of Esperance
sum19-04-nutrition-for-high-end-canola-production-on-ameliorated-soil-east-of-esperance
-33.74639722
123.0258333
Aim: To determine high-end nutrient-growth response capacity after removal of soil constraints. Particularly evaluating how canola responds to nitrogen (N), phosphorus (P) and potassium (K) fertilizer application.
trial-show
2019
Nitrogen
Phosphorus
Potassium
Nutrient and Soil Amelioration
SUM19-15: Phosphorus Rates in Chickpeas, Yandanooka
sum19-15-phosphorus-rates-in-chickpeas-yandanooka
-29.29071
115.7213
Aim: To assess the response of chickpeas to phosphorus (P) fertilizer application on heavy land site SE of Mingenew.
trial-show
2019
Phosphorus
SUM19-19: Form and efficacy of manganese supply to lupin varieties, Eradu
sum19-19-form-and-efficacy-of-manganese-supply-to-lupin-varieties-eradu
-28.7776
115.1402
Aim: On light, sandy soils, Mn deficiency can be prevalent. In narrow leafed lupin, Mn deficiencies can cause split seed and reduce grain yield. Split seed occurrence in the Jurien lupin variety has been observed in 2018, but links with Mn are unknown. This trial aimed to assess Mn rates and sources to combat the split seed issues.
trial-show
2019
Other
Potassium and Mouldboard Ploughing
potassium-and-mouldboard-ploughing
-30.41618889
116.1081611
A long term trial looking at the annual yield response to K applied in 2014 before and after mouldboard ploughing.
trial-hide
2014
Potassium
Nutrient and Soil Amelioration
SUM19-06: Factorial Nitrogen x Phosphorus Rates in Scepter Wheat, Merredin
sum19-06-factorial-nitrogen-x-phosphorus-rates-in-scepter-wheat-merredin
-31.70946
118.113
Aim: To evaluate the response of wheat to nitrogen (N) and phosphorus (P) fertilizer application at a loamy sand site south of Merredin.
trial-show
2019
Phosphorus
Nitrogen
SUM19-05: Factorial Nitrogen x Phosphorus Rate Trial in Scepter Wheat, Tammin
sum19-05-factorial-nitrogen-x-phosphorus-rate-trial-in-scepter-wheat-tammin
-31.63111
117.542
Aim: To evaluate the response of wheat to nitrogen (N) and phosphorus (P) fertilizer application at a sandy clay site east of Tammin.
trial-show
2019
Phosphorus
Nitrogen
SUM19-09: Nitrogen phosphorus and potassium boost for canola after soil amelioration, Merredin
sum19-09-nitrogen-phosphorus-and-potassium-boost-for-canola-after-soil-amelioration-merredin
-31.404625
118.27333
Aim: To assess the combination of pre-drilled phosphorus and potassium rates and in-season nitrogen rates on ameliorated and non-ameliorated soils in the Merredin area.
trial-show
2019
Nutrient and Soil Amelioration
SUM19-16: Nitrogen Strategies for Yield and Grain Quality, Dandaragan (WMG)
sum19-16-nitrogen-strategies-for-yield-and-grain-quality-dandaragan-wmg
-30.65715
115.722
Aim: To assess the response of Scepter wheat to applied high nitrogen rates across a range of application timings, with the purpose of comparing strategies to optimise grain yield and quality in the Dandaragan area.
trial-show
2019
Nitrogen
SUM19-08: N x P +/- K in Mace Wheat, South Burracoppin
sum19-08-n-x-p-k-in-mace-wheat-south-burracoppin
-31.6531
118.621
Aim: To evaluate local wheat response to nitrogen (N), phosphorus (P) and potassium (K) fertilizer application.
trial-show
2019
Potassium
Phosphorus
Nitrogen
SUM19-02: N x P +/- K in Scepter Wheat, Esperance
sum19-02-n-x-p-k-in-scepter-wheat-esperance
-33.47011111
122.403
Aim: To evaluate local wheat response to nitrogen (N), phosphorus (P) and potassium (K) fertilizer application.
trial-show
2019
Potassium
Phosphorus
Nitrogen
Sum15-27 Potassium Sources and placement in wheat, Gibson
sum15-27-potassium-sources-and-placement-in-wheat-gibson
-33.570444
121.8913
To assess the relative value of banding and topdressing K at seeding time or topdressing after emergence on growth and yield of wheat
trial-show
2015
Potassium
Sum15-18 Nitrogen and Potassium in Noodle Wheat Varieties, Binnu
sum15-18-nitrogen-and-potassium-in-noodle-wheat-varieties-binnu
-28.2686111
114.7645361
To investigate the effect of nitrogen and potassium on yield and grain quality of noodle wheat varieties in the northern agricultural region.
trial-show
2015
Potassium
Nitrogen
Sum15-17 Tactical N with Fuel Gauges
sum15-17-tactical-n-with-fuel-gauges
-28.2683
114.76453
Demonstrate and evaluate nitrogen-rich strips (N Gauges) and Normalised Difference Vegetation Index (NDVI) measurement as decision support tools to guide economic application of nitrogen during the growing season.
trial-show
2015
Nitrogen
Sum15-12 Nitrogen and Phosphorus in Wheat, Moorine Rock
sum15-12-nitrogen-and-phosphorus-in-wheat-moorine-rock
-31.537
119.19223
Part of a series of trials to assess wheat response to N and P fertilizer applications under different conditions.
trial-show
2015
Phosphorus
Nitrogen
Sum15-10 NPK in Wheat, Burracoppin
sum15-10-npk-in-wheat-burracoppin
-31.44279
118.5497778
Potassium influence on Nitrogen x Phosphorus in wheat
trial-show
2015
Potassium
Phosphorus
Nitrogen
Sum15-09 Nitrogen and Phosphorus in wheat, Nungarin
sum15-09-nitrogen-and-phosphorus-in-wheat-nungarin
-31.2385
118.11356
To assess how wheat responds to N and P fertilizer applications under different conditions, soil P stores and soil PBI across the wheat belt
trial-show
2015
Phosphorus
Nitrogen
Sum15-08 Nitrogen, Phosphorus and Potassium in Wheat, Merredin
sum15-08-nitrogen-phosphorus-and-potassium-in-wheat-merredin
-31.39423
118.28943
Expanding the series of eastern wheat belt trials assessing how wheat responds to N and P fertilizer applications by the addition of K.
trial-show
2015
Potassium
Phosphorus
Nitrogen
Sum15-06 Tactical N with Fuel Gauge, Morawa
sum15-06-tactical-n-with-fuel-gauge-morawa
-29.1817888
115.739559
Evaluate N Gauges and Normalised Difference Vegetation Index (NDVI) measurement as decision support tools to guide economic application of nitrogen and testing NDVI usage in the Summit In-Season Nitrogen Calculator predictions of yield.
trial-show
2015
Nitrogen
Sum15-05 Tactical N, N-Gauge, Mingenew
sum15-05-tactical-n-n-gauge-mingenew
-28.95798611
115.3246861
Evaluate N Gauges and NDVI measurement as decision support tools to guide economic application of nitrogen during the growing season, and testing NDVI usage in the Summit In-Season Nitrogen Calculator predictions of yield.
trial-show
2015
Nitrogen
Sum15-02 Potassium rate, source and timing, Dandaragan
sum15-02-potassium-rate-source-and-timing-dandaragan
-30.69439
115.727916
To assess the value of sources of potassium on growth and yield of wheat when applied by banding and topdressing at seeding or topdressing after emergence
trial-show
2015
Potassium
Sum15-01 Nitrogen, Phosphorus and Potassium in Wheat, Ballidu
sum15-01-nitrogen-phosphorus-and-potassium-in-wheat-ballidu
-30.629725
116.7713139
Part of a trial series to assess how wheat responds to N, P and K fertilizer applications under different conditions, soil P stores and soil PBI across the wheat belt.
trial-show
2015
Potassium
Phosphorus
Nitrogen
Sum16-29 Nitrogen and Phosphorus on Pasture, Darkan
sum16-29-nitrogen-and-phosphorus-on-pasture-darkan
-33.43063333
116.7107222
To assess the most efficient way to allocate pasture fertilizer spend following a medium term cropping phase.
trial-show
2016
Phosphorus
Nitrogen
Sum16-36 Phosphorus rates in wheat, Northampton
sum16-36-phosphorus-rates-in-wheat-northampton
-28.29635556
114.6251944
To assess how wheat responds to phosphorus (P) fertiliser applications under different conditions, soil P stores and soil Phosphorus Buffering Index (PBI) across the wheat belt
trial-show
2016
Phosphorus
Sum16-33 N & K on Barley, Cranbrook
sum16-33-n-k-on-barley-cranbrook
-34.263055
117.5472139
Response of barley to potassium (K) and nitrogen (N) rates.Yield and grain quality can be limited if either of these macro nutrients is in short supply.
trial-show
2016
Potassium
Nitrogen
Sum16-32 NPK on Oats, Williams
sum16-32-npk-on-oats-williams
-33.16988
117.5624722
Part of a trial series to assess how wheat responds to nitrogen (N), Phosphorus (P) and Potassium (K) fertilizer applications under different conditions, soil P stores and soil Phosphorus Buffer Index PBI across the Wheatbelt
trial-show
2016
Potassium
Phosphorus
Nitrogen
Sum16-30 P rates on high PBI soils, Darkan
sum16-30-p-rates-on-high-pbi-soils-darkan
-33.23115556
116.6098417
Assess how barley responds to phosphorus (P) fertilizer applications under high PBI conditions.
trial-show
2016
Phosphorus
Sum16-28 Potassium Strategies, Darkan
sum16-28-potassium-strategies-darkan
-33.3073333
116.983888
To assess the value of muriate of potash (K) on growth and yield of oats when applied by banding and topdressing at seeding time or topdressing after emergence.
trial-show
2016
Potassium
Sum16-27 Tactical Nitrogen in oats, Wandering
sum16-27-tactical-nitrogen-in-oats-wandering
-32.759744
116.8933889
To test and calibrate the in-season nitrogen (N) calculator from wheat and barley to oats to help mid-season nitrogen decisions and maximise efficiency and returns.
trial-show
2016
Nitrogen
Sum16-24 Response to K Placement, Rates and Timing, Corrigin
sum16-24-response-to-k-placement-rates-and-timing-corrigin
-32.407333
117.9259694
Potassium strategies in wheat: source, rate, timing and placement
trial-show
2016
Potassium
Sum16-23 Tactical Nitrogen in Oats, Wickepin
sum16-23-tactical-nitrogen-in-oats-wickepin
-32.790025
117.6153611
Testing and calibrate the extension of Summit's in-season nitrogen calculator.In conjunction with the Facey Group
trial-show
2016
Nitrogen
Sum16-23 Tactical Nitrogen in Oats
sum16-23-tactical-nitrogen-in-oats
-32.790025
117.6153611
Testing and calibrate the extension of Summit's in-season nitrogen calculator.In conjunction with the Facey Group
trial-show
2016
Nitrogen
Sum16-20 Tactical Nitrogen, Moora
sum16-20-tactical-nitrogen-moora
-30.662911
115.8901722
Evaluate nitrogen-rich strips (N Gauges) and Normalised Difference Vegetation Index (NDVI) measurement as to provide a simple, accurate and easy-to-understand decision support tool to guide economic application of nitrogen during the growing season.
trial-show
2016
Nitrogen
Sum16-21 N x K on canola
sum16-21-n-x-k-on-canola
-33.316972
118.3986194
Investigate the response of canola to potassium (K) and nitrogen (N) rates
trial-show
2016
Potassium
Nitrogen
Sum16-19 Potassium rates and timing
sum16-19-potassium-rates-and-timing
-30.60731
115.8902036
Examine the effect of rates and timing of potassium on wheat
trial-show
2016
Potassium
Sum16-16 P Sources on low PBI Soils
sum16-16-p-sources-on-low-pbi-soils
-29.8316
115.6346389
To assess how wheat responds to phosphorus applications on low fixing soils.
trial-show
2016
Phosphorus
Sum16-15 P Rates and Sources
sum16-15-p-rates-and-sources
-30.86425
115.4702583
trial-show
2016
Phosphorus
Sum16-13 Nitrrogen Timing on Canola
sum16-13-nitrrogen-timing-on-canola-2
-29.259558
115.597322
Use of nitrogen to shorten the flowering window of RR hybrid canola
trial-show
2016
Nitrogen
Sum16-13 Nitrrogen Timing on Canola
sum16-13-nitrrogen-timing-on-canola
-29.25955833
115.597322
trial-show
2016
Nitrogen
Sum16-05 N & P in Cereals
sum16-05-n-p-in-cereals
-30.4301111
118.246694
Determine the response of wheat, barley and oats to nitrogen (N) and phosphorus (P) application under the same conditions in the far eastern Wheatbelt
trial-show
2016
Phosphorus
Nitrogen
Sum16-02 NPK Wheat on Wheat
sum16-02-npk-wheat-on-wheat
-31.42546389
118.2601417
Nitrogen x Phosphorus +/- Potassium in Wheat on Wheat Stubble
trial-show
2016
Potassium
Phosphorus
Nitrogen
Sum14-04 K x Mouldboard Ploughing
sum14-04-k-x-mouldboard-ploughing
-30.416191
116.108161
A long term (2014 to 2016) potassium and mouldboard ploughing in Wheat, Barley and Canola
trial-show
2016
Nutrient and Soil Amelioration
Sum18-21 Wetter as a seed coating
sum18-21-wetter-as-a-seed-coating
-33.498325
116.7551389
To assess the germination and yield response of canola seed to coating with increasing wetter concentrations on non-wetting gravel soil.
trial-hide
2018
Other
Sum18-20 Phosphorus sources and rates
sum18-20-phosphorus-sources-and-rates
-33.55365278
116.6376944
To compare and contrast the response of wheat to P fertilizer application from TSP and MAP on high PBI, forest gravel soil
trial-hide
2018
Phosphorus
Sum18-19 P rates on high PBI soils
sum18-19-p-rates-on-high-pbi-soils
-33.55365278
116.6384639
To assess the response of wheat to P application on high PBI, forest gravel soil.Also to coroborate the new DGI soil test.
2018
Phosphorus
Sum18-18 Nitrogen Timing on Canola
sum18-18-nitrogen-timing-on-canola
-31.61384722
117.4246111
To assess the effect of applying nitrogen in-season at different timings on the flowering period, yield and quality of canola production
trial-hide
2018
Nitrogen
Sum18-17 P Placement
sum18-17-p-placement
-32.31546944
118.5800278
To investigate the optimal placement strategy for phosphorus fertilizer on high PBI soil
trial-hide
2018
Phosphorus
Sum18-16 N x P x K
sum18-16-n-x-p-x-k
-33.55364722
116.6423611
trial-hide
2018
Potassium
Phosphorus
Nitrogen
Sum18-15 P Sources
sum18-15-p-sources
-33.59191667
116.7125278
To assess the response of wheat to P application from two fertilizer sources, MAP and TSP.Also looking at the value of drilling P fertilizer on High PBI soil compared to banding the fertilizer below the seed.
trial-hide
2018
Phosphorus
Sum18-14 N x K x Wetter, Binnu
sum18-14-n-x-k-x-wetter-binnu
-27.990833
114.7560472
To assess the response of wheat to N, the value of applying K and using wetter coated seed on sandy soil
trial-show
2018
Nitrogen
Sum18-13 N x P x K x Cu
sum18-13-n-x-p-x-k-x-cu
-30.14031667
115.5228278
To assess the response of wheat to nitrogen and phosphorus fertilizer application and value of potassium and copper
trial-show
2018
Nitrogen
Sum18-12 N x Variety
sum18-12-n-x-variety
-29.217903
115.9959306
In collabaration with Morawa Ag CollegeTo assess the nitrogen response of oats, wheat and barley varieties and the accuracy of the nitrogen calculators in season recommendations to achieved 10.5% and 11.5% grain protein.
trial-hide
2018
Nitrogen
Sum18-11 Split N rates
sum18-11-split-n-rates
-28.92169444
115.2878889
To assess the response of wheat to N and to compare different application rates split between upfront and in-season top up.
trial-show
2018
Nitrogen
Sum18-10
sum18-10
-28.57548333
114.7575278
Assess the response of wheat o nitrogen and phosphorus fertilizer application after biserrulla
trial-hide
2018
Nitrogen
Sum18-09 NPK
sum18-09-npk
-30.5489666
117.5252778
To assess the response of wheat to combinations of nitrogen and phosphorus application and to additional value of using potassium in the Ballidu area
trial-hide
2018
Phosphorus
Sum18b N x K x Nematodes
sum18b-n-x-k-x-nematodes
-32.490791
117.606222
To assess the response of wheat to nitrogen and potassium fertilizer on canola stubble and to evaluate the advantage of potassium in promoting plant health and alleviating nematode susceptibility.
trial-hide
2018
Potassium
Sum18-08a N x P x Nematodes
sum18-08a-n-x-p-x-nematodes
-32.490825
117.596055
To assess the response of wheat to nitrogen and potassium fertilizer on lupin stubble and to evaluate the advantage of potassium in promoting plant health and alleviating nematode susceptibility.
trial-hide
2018
Potassium
Sum18-07 NPK rates
sum18-07-npk-rates
-31.815197
118.7578261
Assess the response of wheat to nitrogen and phosphorus fertilizer +- potassium
trial-hide
2018
Nitrogen
Sum18-06 P x K in wheat
sum18-06-p-x-k-in-wheat
-31.48143611
118.6393194
Assess response of wheat to phosphorus and potassium fertilizer. South Burracoppin
trial-show
2018
Potassium
Sum18-05 N x P in Barley, Sth Burracoppin
sum18-05-n-x-p-in-barley-sth-burracoppin
-31.506352
118.65282
Assess the response to N and P in Barley after amelioration practices.
trial-show
2018
Phosphorus
Nitrogen
Sum18-04 N x P
sum18-04-n-x-p
-31.528002
118.57938
Assess the response in Canola to N & P rates, Sth Burracoppin
trial-hide
2018
Phosphorus
Nitrogen
Sum18-03 N x P
sum18-03-n-x-p
-30.81588
118.21038
Efficiency of Nitrogen and Phosphorus in the Eastern Wheatbelt
trial-hide
2018
Phosphorus
Nitrogen
Sum18-01 N x P
sum18-01-n-x-p
-31.647563
118.1732306
Efficiency of Nitrogen and Phosphorus in the Eastern Wheatbelt
trial-hide
2018
Nitrogen
Sum18-GK 1
sum18-gk-1
-30.54816389
117.524472
Collaborative project with GRDCAssess the relative K requirement and responsiveness of K fertilizer in wheat.
trial-hide
2018
Potassium
Sum18-GP5
sum18-gp5
-33.591694
116.73611
In collabaration with GRDC Increasing profits from fertilizer
trial-hide
2018
Phosphorus
Sum17-20 NPK in Pasture
sum17-20-npk-in-pasture
-30.87759444
115.6989
Efficient ways of allocating Nitrogen (N), Phosphorus (P) and Potassium (K) spend on pasture.
trial-hide
2018
Nitrogen
Sum17-17 Potassium soil test methods and responses
sum17-17-potassium-soil-test-methods-and-responses
-28.72779
115.21138
A long term potassium (K) trial to determinne more accurate critical values for K
trial-hide
2018
Potassium
Sum16-29
sum16-29
-33.43063
116.68618
Nitrogen and Phosphorus in pasture
trial-hide
2018
Phosphorus
Sum16-11 Long Term P Strategies
sum16-11-long-term-p-strategies
-33.18691
121.64899
Long term P strategies commenced in 2016
trial-hide
2018
Phosphorus
Sum18 - GP4 P rates in wheat.
sum18-gp4-p-rates-in-wheat
-31.64758
118.17311
In callaboration with GRDC. Increasing profits with fertilizer
trial-hide
2018
Phosphorus
Sum18-GP3 P rates in wheat
sum18-gp3-p-rates-in-wheat
-32.49061
117.6063
In collaboration with GRDC. Increasing profits from fertilizer
trial-hide
2018
Phosphorus
Summ18-GP2
summ18-gp2
-29.60133
115.52533
In collaboration with GRDC. Increasing profit from fertilizer
trial-hide
2018
Phosphorus
Sum18-GP1 P rates in wheat, Binnu
sum18-gp1-p-rates-in-wheat-binnu
-27.98108
114.76209
In collaboration with GRDC. Increasing profit from fertilizer
trial-show
2018
Phosphorus
Darkan 2017
darkan-2017
-33.22045
116.70326
Assessing nitrogen, phosphorus and potassium responses in wheat
trial-show
2017
Phosphorus
Mukinbudin 2017
mukinbudin-2017
-30.91343
117.996103
Response of oats to Nitrogen and Phosphorus with and without potassium.
trial-show
2017
Phosphorus
Nokaning 2017 Barley
nokaning-2017-barley
-31.347444
118.24865
Assessing the yield response of Barley to nitrogen and phosphorus rates on heavy red loams.
trial-show
2017
Phosphorus
Moorine Rock 2017
moorine-rock-2017-2018
-31.51355
118.91291
Examines rate responses in Wheat to Nitrogen, Phosphorus and Potassium
trial-hide
2017
Phosphorus
Moorine Rock 2017
moorine-rock-2017
-31.877594
118.912916
Examines rate responses in Wheat to Nitrogen, Phosphorus and Potassium
trial-show
2017
Phosphorus
Grain Legumes
Grain Legumes
Pasture
Pasture
Canola
Canola
Oats
Oats
Barley
Barley
Wheat
Wheat

The addition of phosphorus fertilizer (plus other nutrients) has become essential for agriculture in Western Australia to remain sustainable. It’s a known fact that WA soils are some of the poorest in the world when it comes to phosphorus, however, our native plants have evolved and adapted to survive in these conditions.

Introduced plants, including agricultural crop and pasture species, have no such adaptations. As a result, they will not produce to their maximum potential or even survive without the addition of phosphorus in the form of fertilizer.

Role of phosphorus in plants

Phosphorus is essential to the health of plants. This mineral is a major component of the genetic material DNA, plus it’s involved in many of the biochemical processes critical for plant metabolism, such as photosynthesis and energy production. Its critical role in early growth is demonstrated by the lack of root growth seen in phosphorus deficient plants.

As demonstrated in this nutrient removal table, relatively small amounts of phosphorus are removed in grain.

Phosphorus in soils

Phosphorus is very mobile once within the plant, yet immobile in the soil. Once phosphorus from water-soluble fertilizers is dissolved into the soil solution, it quickly becomes ‘bound’ by iron, aluminium and calcium particles, rendering it less available to the plants for which it was intended. For this reason, crops sown with phosphorus-containing fertilizer are placed as close to the seed as possible to enable seedling uptake before adsorption into the soil particles takes place.

Phosphorus deficiency

Given the major role phosphorus plays in plant metabolism, a deficiency will affect all aspects of growth. Plants lacking phosphorus will appear stunted, often with a reddish colouration on the stems. They will also have dark green leaves and dying leaf tips.

Preventing phosphorus deficiency

To prevent crop or pasture deficiencies, apply adequate rates of phosphorus-containing fertilizer either at seeding or prior to germination. An adequate rate can be established from a soil analysis, in conjunction with tissue testing.

Correcting phosphorus deficiency

Correcting a deficiency in an established crop is very difficult. This is due to the immobility of applied phosphorus, which would be bound by soil before getting into the root zone.

Supplying adequate phosphorus to the plant can be difficult in some soil types and some seasons. Recent research has highlighted the problem in soils with high phosphorus buffering index (PBI), particularly during dry seasons where the surface of the soil dries out early in the plants' life.

To find out more about preventing or correcting a phosphorus deficiency, speak to your local Area Manager.

Pasture
Soil Test Level
(K - ppm or mg/kg)
Cereals
Lupins
Canola*
Pulses
Low Rainfall
Medium Rainfall
High Rainfall
>120
0
0
0
0
0#
80 - 120
P.T.
0
0
10-20
20-30
60 - 80
15-20
0
10-20
20-30
30-40
40 - 60
20-25
P.T.
20-30
30-50
40-60
25-35
20-25
30-50
40-60
50-60
Product
Autumn Application
Winter Application
After 4 weeks
After 7 weeks
After 4 weeks
After 7 weeks
Amsul
3.7
6.9
1.0
2.5
Urea
59.9
58.4
36.8
38.9
Cations
Anions
Chemical Symbol & Charge
Name
Chemical Symbol & Charge
Name
K+
Potassium
NO3-
Nitrate
NH4+
Ammonium
Cl-
Chlorine
Na+
Sodium
SO4--
Sulphate
Cu++
Copper
HPO4- -
Phosphate
Zn++
Zinc
BO3----
Boron
Mn++
Manganese
MoO4- -
Molybdenum
Ca++
Calcium
Mg++
Magnesium
Fe++
Iron
N
P
K
S
Cu
Zn
Mn
Ca
Mg
Clover Pasture
25-30
3.5
16-20
2-3
0.005
0.02
0.40
0.4
1.2
Product
% N
Urea
46.0
MAXam/Amsul
21.0
UreaPlus
37.1
NitroPlus
33.4

Compounds

Product
%Ammonium-N
DAPSZC
16.4
MAPSZC
10.6
AllStar
13.0
Vigour
5.0
Product
N
P
K
S
Ca
Mg
Cu
Zn
Mn
kg per tonne
grams per tonne
Wheat
23
3
4
1.4
0.33
0.93
5
29
40
Barley
20
2.9
4.4
1.1
0.3
1.08
3
15
11
Oats
16
3
4
1.5
0.5
1.0
3
17
40
Canola
40
6.5
9.2
9.8
4.1
4.0
4
40
40
Lupins
51
3.8
8.8
3.1
1.7
1.7
5
30
60
Chickpeas
34
3.8
8.9
1.8
1.1
1.2
7
38
34
Faba Beans
39
3.8
9.8
1.4
1.1
1.0
10
28
30
Field Peas
37
4.0
8.2
2.0
0.7
1.2
5
35
14
Hay - cereal
15
1.0
15
1.0
0.5
1.1
5
12
40
Straw - cereal
7
0.7
10
0.7
3
3
Milk
5.7
0.95
1.4
0.3
1.2
0.12
Greasy Wool
170
0.26
15.8
28.5
1.2
0.3
Sheep - Live
34
7.0
2.3
4.0
14.4
0.4