关键词: 农户行为, 农户行为, 盐碱地, 信贷, 治理技术

Abstract: The study aims to understand the effect of nitrogen management in different soil layers on growing development and nitrogen use of summer maize, using improved summer precision seeder with subsoiling and layered fertilizer. Two nitrogen fertilizer types, two soil depths with two nitrogen fertilization ratios were set. The effects of nitrogen management in different soil layers on leaf area index, dry matter accumulation per plant, yield and nitrogen partial factor productivity of summer maize were studied. The results indicated that the leaf area index, dry matter accumulation, yield and nitrogen partial factor productivity of summer maize with subsoiling and layered fertilization technology all obtained significant increase, compared to traditional fertilization technology with the same nitrogen amount. The yield and nitrogen partial factor productivity were increased by 5.5%-7.9%. Of the different subsoiling and layered fertilization technologies, the application of compound fertilizer with topdressing urea at bell stage obtained greater dry matter accumulation, yield and nitrogen use efficiency. While, it had no significant difference with controlled release fertilizer applied as base. The subsoiling and layered fertilization with compound fertilizer applied at 8cm and 12cm soil layer with ratios of 3:7 obtained the highest yield and nitrogen partial factor productivity both increased by 7.9%, which was the best model for subsioling and layered fertilization technology. Therefore, in summer maize areas of direct-seeding on wheat stubbles, the subsoiling and layered fertilization technology should be applied to improving yield and nitrogen efficiency.