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Defining critical soil nutrient concentrations in soils supporting grains and cotton in Northern NSW and Queensland

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The balance of nutrients removed in harvested product is coming from the background soil fertility in both organic (primarily N and S) and inorganic (P, K and other cations) forms... Current commercially available soil tests for both P and K are correlated with the immediately plant-available nutrient pools, so the background soil nutrient reserves are undetected and there is increasing uncertainty about the need to apply expensive fertilizers to meet current crop demand in different soils and regions... Some soil types and locations appear to have multiple nutrient limits on crop growth; Combinations of P, K and/or S in field experiments are increasing crop responses; Soil test after looking at yield maps or soil type areas to identify potential risk zones; Consider plant tissue testing to monitor crop..
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