Effects of different winter ploughing models on soil physical and chemical properties, peanut yield and economic benefits in sloping farmland of red soil

In order to evaluate the suitability of different winter ploughing models in sloping farmland of red soil, the winter ploughing models experiment was set up, which included three treatments: continuous ploughing (CK), alternate winter ploughing (T1) and no winter ploughing (T2).The effects of different winter ploughing models on soil physicochemical properties, peanut yield and economic benefits were analyzed.The results showed that: (1) No ploughing in winter significantly increased the soil bulk density and reduced the soil water content at 0~20 cm soil layer before peanut sowing compared with CK(P < 0.05); (2) T1 treatment had little effect on soil nutrients at 0~20 cm soil layer, only significantly reduced the content of available potassium in 10~20 cm soil layer (P < 0.05), while T2 treatment significantly reduced the content of soil organic matter, alkaline-hydrolysis nitrogen and available potassium at 10~20 cm soil layer compared with CK(P < 0.05); (3) Different winter ploughing models could affect peanut seedling emergence rate and peanut yield by affecting soil bulk density and water content of 0~20 cm soil layer before peanut sowing, and different winter ploughing models could also increase or decrease the yield of peanut by increasing or decreasing the content of available potassium at 10~20 cm soil layer; (4) In the three years (2018~2020) of different winter tillage modes, CK had the highest economic benefit, with a decrease of 6.90% in T1 treatment and 43.5% in T2 treatment.From the perspective of maintaining the soil quality and economic benefits in sloping farmland of red soil, continuous winter ploughing is an excellent winter ploughing mode for sloping farmland of red soil, while rotated tillage in winter could be adopted in some sloping farmland of red soil.