Effects of different mulching and tillage practices on soil nutrient temporal and spatial characteristics and crop yield of sloping farmland in black soil areas
To investigate the spatiotemporal variation characteristics of soil nutrients and the mechanism of crop yield in maize and soybean rotation farmland of sloping farmland in black soil areas under different covering and tillage measures,field experiments were conducted from 2022 to 2023.Four treatments of uniform covering of broken stems along the slope ( SM),uniform covering of broken stems across the slope ( CM),covering crops along the slope ( SC),and traditional tillage ( CK) were set up to explore the trend of changes in soil nutrient content with growth period and soil depth under different cover and tillage measures,the changes in crop yield,and the correlation between soil nitrate nitrogen ( NO3--N),ammonium nitrogen ( NH4+-N),available phosphorus ( AP ),and available potassium ( AK ) contents and crop yield under different cover and tillage measures.The results showed that soil AP content in each treatment showed a trend of first increasing and then decreasing with the ad-vancement of crop growth period while the soil AK content showed a gradually decreasing trend with the advance-ment of crop growth period.The NH4+-N,NO3--N,AP and AK contents of each treatment showed a gradually de-creasing trend as the soil depth deepened.The dry mass and yield of each treatment were significantly improved by 3.29%～11.96% and 4.29%～14.77%,respectively compared to the CK treatment.Except for the NH4+-N content in the 0～20 cm and 20～40 cm soil layers in 2022,the nutrient contents in all other soil layers showed a significant positive correlation with crop yield ( P<0.05),the influence of soil AK content on crop yield was higher.
sloping farmlandmaize and soybean rotationmulchingsoil nutrientcrop yield
万方数据
维普
