丰产沟内秸秆还田对第一年水稻产量的影响效果都不明显,但对第二年水稻产量的影响明显,秸秆还田比对照增产6.3%～8.8%。后茬油菜,秸秆还田产量提高3.0%～4.0%,以单位面积计算产量,施用小麦、油菜秸秆处理水稻产量增产11.7%～27.7%,油菜产量增产16.6%～17.7%。水稻NPK吸收量,秸秆还田处理N增加6.8%～12.6%,P增加11.4%～22.4%,K增加21.0%～27.0%。试验后的土壤有机质含量提高5.7%～6.6%,土壤速效磷含量提高4.9%～9.1%。 The effect of returning straw to straw in the first year on the yield was not obvious, but the effect on the second year was obvious. Straw returning increased by 6.3% ~ 8.8% compared with the control. After rapeseed and straw returning, the yield increased by 3.0% -4.0%. The yield per unit area was calculated. Yields of rice increased by 11.7% -27.7% and rapeseed yield increased by 16.6% -17.7%. NPK uptake by straw and straw returning treatment increased by 6.8% ~ 12.6%, P increased by 11.4% ~ 22.4% and K increased by 21.0% ~ 27.0%. After the experiment, the content of soil organic matter increased by 5.7% ~ 6.6% and the available phosphorus content increased by 4.9% ~ 9.1%.