Effects of rape green manure returned to field on saline alkali soil improvement in Xinjiang

• Main Authors: LIU Hui, LI Zi-yu, BAI Zhi-gui, LIU Jian-guo
• Format: Article
• Language: zho
• Published: Agro-Environmental Protection Institute, Ministry of Agriculture 2020-11-01
• Series: Journal of Agricultural Resources and Environment
• Subjects: rape; green manure; saline-alkali soil; soil physical and chemical properties; base ion
• Online Access: http://www.aed.org.cn/nyzyyhjxb/html/2020/6/20200612.htm
• ISSN: 2095-6819; 2095-6819

We investigated the effects of returning rape green manure to field on saline alkali soil improvement in Xinjiang. Moderately saline and alkaline wastelands were subjected to three rape green manure treatments:1 year(T1), 2 years(T2), and no green manure(CK) to elucidate the effects of returning rape green manure on the physical and chemical properties of saline soil, soil salt composition, and cotton yield. The results showed that the effect of returning rape green manure was as follows:T2 > T1 > CK. Compared with CK, T2 and T1 treatments significantly(<i>P</i><0.05)increased cotton seed yield by 27.5% and 13.5%, respectively. The pH value and conductivity of T2 were 1.0 unit and 0.7 mS·cm^-1 lower, respectively, than that of CK; Moreover, total nitrogen, total phosphorus, total potassium, and organic matter content of T2 increased by 44.8%, 9.1%, 6.5%, and 115.2%, respectively. The content of saline-alkali ions in the soil was reduced by returning rape green manure to the field. Compared with CK, the content of T2 salt composition Ca²⁺, K⁺, Mg²⁺, Na⁺, Cl^-, SO₄^2-, CO₃^2-, and HCO₃^- significantly(<i>P</i><0.05)decreased by 30.3%, 42.7%, 41.0%, 30.5%, 39.2%, 33.0%, 32.2%, and 32.1%, respectively. The results indicated that rape green manure could improve the physical and chemical properties of soil, increase nutrient content, decrease salinealkali ion content, and have a good effect on saline-alkali soil improvement in the oasis arid area of Xinjiang.