Analysis of the Available Straw Nutrient Resources and Substitution of Chemical Fertilizers with Straw Returned Directly to the Field in China

Returning straw to the field is most significant utilization technique for China’s green development. It can provide nutrients crop growth and improve soil organic matter content. However, there are no standard parameters measuring nutrient content of directly returned field. In addition, in disregarded least researched. Therefore, address these issues, current research examines main composition fields potential substitution chemical fertilizers. This study used latest data on straw-to-grain ratio straw’s direct return from Database Agricultural Crops Straws Resources China (DACSRC) as basis a detailed estimation amount resources The were measured based yield nitrogen (N), phosphorous (P2O5), potassium (K2O) contents. results reveal that maximum was 517 teragram (Tg), while 128 Tg (25%) total not collected but left North region had an enormous at 176 (34%), South 26 (5%). amounts seasonally available N, P2O5, K2O 2 Tg, 1 7 respectively. per hectare (ha) 78 kg. quantity straw-originating corresponds 23% fertilizers applied, which substitute 10% 9% 58% K2O. provides critical insights effective ways fertilization through increased rate releasing seasonal nutrients.