Effects of increasing application of organic fertilizer on subsoil fertility betterment in paddy field

• Main Authors: HAN Shang, WU Ji, ZHANG Xiang-ming, HU Peng, YANG You-bing, LI Min, WANG Hui, TANG Shan
• Format: Article
• Language: zho
• Published: Agro-Environmental Protection Institute, Ministry of Agriculture 2018-06-01
• Series: Journal of Agricultural Resources and Environment
• Subjects: organic fertilizer, soil nutrient, topsoil, subsoil, yield
• Online Access: http://www.aed.org.cn/nyzyyhjxb/html/2018/4/20180407.htm

Field trials were conducted to study the effect of soil nutrient contents in topsoil(0~15 cm) and subsoil(15~30 cm) and rice yield on the basis of the application of chemical fertilizer adding organic fertilizer. The results showed that the increasing application of cattle manure and cake fertilizer obviously improved the contents of organic matter, total nitrogen and available phosphorus in soil, with increase by 32.17% and 10.96%, 30.69% and 6.56%, 131.48% and 31.74% in topsoil, while improved by 10.72% and 4.77%, 6.72% and 3.64%, 62.69% and 11.40% in subsoil, respectively compared with the single fertilizer treatment. The treaments of increasing application of organic fertilizers increased rice yield and inter-annual stability. The yield of the increasing application of cattle manure and cake fertilizer treatments increased by 7.98% and 7.72%, while the coefficient of variation decreased by 3.90% and 3.20%. There were positive correlations of a certain extent between the rice yield and the soil nutrient indexes. The correlation coefficients of the yield with soil organic matter, total nitrogen and available phosphorus in subsoil was higher than those in topsoil. The contents of soil organic matter, total nitrogen and available phosphorus presented extremely significant(<i>P</i><0.01) correlations with rice yield stability in topsoil and subsoil. In summary, increasing application of organic fertilizer had good effects on soil nutrient contents, rice yield and its stability. The emphasis of fertility betterment should be put on subsoil in production because the nutrient contents in topsoil and subsoil both could present an appreciable effect on rice yield and its stability.