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added stubble phosphorus

Catalogue: Ground Cover
Research shows that nutrients released from stubble, including phosphorus, need to be factored in when planning fertiliser requirements.. The type, size, placement and overall stubble load, as well as rainfall and soil moisture, can all influence the timing and amount of phosphorus released from stubbles to soil... A recent glasshouse experiment conducted by Sarah examined how the size and placement of stubble affected the amount of stubble phosphorus returned to the soil, and how much of this phosphorus was subsequently used by wheat plants...
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