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P dynamics in vertosols-factors influencing fertiliser P availability over time and the implications for rate, application method and residual value

Bell, M., Raymond, N., Kopittke, P., Janke, C. and Lester, D. (2022) P dynamics in vertosols-factors influencing fertiliser P availability over time and the implications for rate, application method and residual value. Grains Research Update . p. 51.

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Article Link(s): https://grdc.com.au/__data/assets/pdf_file/0031/57...

Abstract

Take home messages
• Fertiliser P is an increasingly important contributor to profitable cropping and efficient use of available water and nitrogen
• The method of P application, soil characteristics and seasonal moisture availability will significantly impact the recovery of fertiliser P by plants. Starter P is important but only supplies a small proportion of the crop total P requirement in the year of application
• Dispersing or spreading P fertiliser through large soil volumes to increase root exposure to fertilised soil reduces the risk of P precipitation but enhances the risk of low crop recovery due to strong P sorption to soil surfaces. This risk is enhanced when soil P reserves are strongly depleted and occurs somewhat independent of PBI
• Conversely, applying P in concentrated bands limits the risks of irreversible P sorption but increases the chances of precipitating insoluble P minerals – particularly when fertiliser bands are acidic and/or co-application of other cations like K increases calcium availability in
the soil solution
• Fertiliser strategies need to balance the competing risks and rewards from differing volumes of soil P enrichment, while ensuring adequate available P in both topsoils and immediate subsoil layers to meet water limited crop demands
• Closer spaced, less concentrated P bands applied more frequently hold the keys to more effective crop P use in these soils and will increase the return of P in crop residues to enhance the background P supply in topsoil layers.

Item Type:Article
Business groups:Crop and Food Science
Additional Information:Goondiwindi update 2022
Keywords:P sorption, PBI, P saturation indices, deep bands, P incorporation, residual value
Subjects:Agriculture > Agriculture (General) > Soils. Soil science
Agriculture > Agriculture (General) > Methods and systems of culture. Cropping systems
Agriculture > Agriculture (General) > Fertilisers
Plant culture > Field crops > Grain. Cereals
Agriculture > By region or country > Australia
Deposited On:30 Nov 2022 02:02
Last Modified:30 Nov 2022 02:06

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