Development of a Novel Model of Soil Legacy P Assessment for Calcareous and Acidic Soils

Phosphate (P) rock is a finite natural resource, and its use for P fertilizer production has resulted in rapid depletion worldwide. In order to reduce the of resources, reducing input into agricultural systems necessary. The assessment legacy soil an option maintain crop yield with low input. Many models have been tested assess contribution uptake. However, these face common challenge as conceptual pools cannot be accurately initiated evaluated using measured indexes. this study, novel (LePA) model was developed according empirical equations about uptake, Olsen-P, total from two long-term experiments typical calcareous acidic soils China. We used DPPS (dynamic phosphorus pool simulator) contrast estimate simulation accuracy new LePA model. calibration validation datasets both were set-up by collecting data results showed that simulated uptake similar soil. While failed depict under pH conditions, worked well after modification when limited growth caused conditions considered. Moreover, can also predict changes TP Olsen-P application, which are functions compared Based on scenario analysis generated model, application could reduced 52% Yangling 46% Qiyang conventional rate during period current yields if utilized efficiently. useful tool guiding management field country scales.