Abstract:

The study aimed to investigate the response of rice yield and components, and soil physicochemical properties to organic fertilizer (OF) substitute for chemical fertilizer (CF) in rice-grain rotation system, and provide theoretical foundation for rational fertilization, increase yield and promote fertility. The experiments was conducted in long-time fertilizer test point in Yizheng, Jiangsu, 6 treatments were set: convention chemical fertilizer (M0), OF ratios of 10% (M10), 20% (M20), 30% (M30), 40% (M40), and 50% (M50). The yield and composition were studied, and the basic physicochemical property was measured. The results indicated that compared with M0, the rice yield decreased at the ratios of 40% and 50% in the first year, and increased at all treatments in the second year. The highest rice yields were observed at the ratios of 30% and 40% in the second year. With the increase of OF ratio, soil organic matter content increased significantly, whereas there were decrease trends for the concentrations of total phosphorus and available phosphorus, and small increase was found in available potassium, there were no significant differences in other indices. In the precondition of stable rice yield, 20%-30% OF could promote crop growth and nutrient uptake, increase soil fertility.

Key words: Rice, Yield, Yield Components, Organic Fertilizer, Soil Physicochemical Properties, Soil Nutrient