Effects of Annual Straw Incorporation Combined with Application of Nitrogen Fertilizer in Rice Season on Dry Matter and Nutrient Accumulation Characteristics of Subsequent Rapeseed

In the rice–rapeseed rotation system, straw incorporation plays an important role in achieving rational utilization of resources and maintaining crop production. However, study rotation, there was no on effect nitrogen (N) fertilizer rice season dry matter accumulation (DMA) nutrient subsequent rapeseed. So, this relied localization experiment annual (full returning to field, SR; control is full removal from CK) with different N application rates (N1: 0 kg ha−1, N2: 75 N3: 150 N4: 225 ha−1) season. Based fourth year implementation, effects combined rate leaf area index (LAI), photosynthetic potential (PP), DMA its distribution proportion rate, uptake allocation rapeseed were discussed. At bolting stage (BS), initial flowering (IFS), terminal (TFS), mature (MS), SR significantly higher than that CK by 69.90, 64.27, 62.90, 41.27%, respectively. The N, phosphorus (P), potassium (K) at BS, IFS, TFS, MS. Straw treatment had a significant impact apparent surplus P, K rice, rapeseed, seasons, while or extremely (AS) indicating fertilization previous crops certain aftereffect. Therefore, sustainable farmland management measure.