Impact of Legacy-P as Source of P to Crops ![]() Moreover, some agronomic approaches are described which have the potential to enable the use of legacy P more effectively and allow more accurate predictions on the ability to reduce legacy P on the environment, while maintaining sustainable production of crops. In this Research Topic we have collected contributions from North America, South America and Australasia, highlighting the impacts of legacy P on agricultural and environmental sustainability. Moreover, as economically viable phosphate rock is finite and non-renewable, agricultural systems need to be redesigned for a better balance (input = output) of P and postpone a future scarcity scenario. Unfortunately, this imbalanced P input: output ratio is necessary in most cases to maintain satisfactory yields in conventional agricultural systems, ultimately promoting environmental concerns such as eutrophication, if transferred to water bodies. Part of applied P is accumulated in the soil in non-labile forms due to its chemical high-affinity reactions and occlusion to soil minerals and organic matter, known as “legacy P.” Continued fertilizer applications beyond plant requirements have led to a build-up of legacy P in soils. However, many soils globally are P deficient and phosphate fertilizer input is necessary for agricultural production. ![]() Phosphorus (P) is an essential nutrient for higher plants and the primary source of this nutrient is from soil.
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