| In order to explore the effects of different mulching and tillage measures on the spatio-temporal changes of soil nutrients and crop yield in rice and bean rotation farmland in black soil area, four treatments were set up: downslope uniform culm cover (SM), transverse slope uniform culm cover (CM), downslope cover crop (SC) and traditional tillage (CK). The variation trend of soil nutrient content with growth period and soil depth and crop yield under different mulching and tillage measures were analyzed, and the correlation between soil nitrate nitrogen (NO3--N), ammonium nitrogen (NH4+-N), available phosphorus (AP) and available potassium (AK) contents and crop yield were determined under different mulch and tillage measures. The results showed that the soil AP content increased first and then decreased with the change of crop growth period, and the soil AK content decreased with the change of crop growth period. The contents of NH4+-N, NO3--N, AP and AK in each treatment showed a decreasing trend with the change of soil depth. Compared with CK treatment, the dry matter quality and yield of each treatment were significantly increased by 3.29%-11.96% and 4.29%-14.77%, respectively. Except for soil NH4+-N content in 0-20cm and 20-40cm soil layers in 2022, soil nutrient content in other soil layers showed a significant positive correlation with crop yield (P<0.05). Compared with soil NO3--N, NH4+-N and AP content, soil AK content had a more significant impact on crop yield. |