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

作者：Jingmiao Shao, Chunyu Gao, Patience Afi Seglah, Jie Xie, Zhao Li, Yuyun Bi, Yajing Wang · 发表于：Agriculture · 年份：2023 · DOI：10.3390/agriculture13061187 · 被引用次数：41 · 研究领域：Soil Carbon and Nitrogen Dynamics、Polymer-Based Agricultural Enhancements、Soil erosion and sediment transport

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