Abstract: In order to explore the tillage method that increases the re-sown soybean yield and decreases the soil residues of nitrate-nitrogen under drip irrigation in the Ili River Valley, a field experiment was conducted in 2017 to study the effects of different tillage methods on soil physical properties, nitrate nitrogen and re-sown soybean yield. The results showed that the soil bulk density increased with the depth of soil, and the soil porosity showed the opposite trend. In 0-20 cm and 20-40 cm soil layers, the soil bulk density of NT treatment reached to the maximum value, and the porosity value were the smallest, the difference being significant(P < 0.05). The soil water content of each treatment period increased with the depth of the soil layer, showing TP > S > T > NT. The change trend of soil nitrate nitrogen content was the same as the soil bulk density, and each treatment period also showed S < TP < T < NT. The soil bulk density, porosity, water content and nitrate nitrogen content of each treatment were significantly different in the soil layer of 0-40 cm. The yield of TP treatment was the highest, reaching to 3 185.96 kg/ha, which was 12.33%, 20.04%, and 26.19% higher than that of S, T and NT treatment, respectively, all reaching to the P < 0.05 significant level. In the treatment without film mulching, S treatment was 6.86% and 12.35%,higher than T and NT treatment, respectively, and had the significant difference with the latter(P < 0.05). Therefore, in the Ili River Valley, tillage and mulching is the best way to cultivate high-yield soybean, and deep ploughing is the way to ensure higher soybean yield and reduce soil nitrate nitrogen residue.

Key words: Re-sown soybean, Tillage method, Soil physical properties, Soil nitrate nitrogen, Yield

CLC Number: 

• S143.1

• S565.1