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Effects of rotations and different green manure utilizations on crop yield and soil fertility.

YAO Zhi-yuan1, WANG Zheng1, LI Jing1, YU Chang-wei2, CAO Qun-hu2, CAO Wei-dong3, GAO Ya-jun1,4   

  1. (1College of Resource and Environment, Northwest A&F University, Yangling 712100, Shaanxi, China; 2Changwu District Agrotechnology Extension Center, Changwu 713600, Shaanxi, China; 3Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, China; 4Ministry of Agriculture Key Laboratory of Plant Nutrition and Agrienvironment in Northwest China,  Yangling 712100, Shaanxi, China)
  • Online:2015-08-18 Published:2015-08-18

Abstract: A 4year field experiment was conducted to investigate the influence of three rotation systems and three corresponding leguminous green manure (LGM) application methods on wheat yield and soil properties. The rotation patterns were summer fallow  winter wheat (SW), LGM  winter wheat (LW) and LGM  spring maize  winter wheat (LMW). The three LGM application methods of LW included: early mulch, early incorporation and late incorporation while the three LGM application methods of LMW were: stalk mulch, stalk incorporation and stalk moveaway. The results indicated that for LW, LGM consumed more soil water, thus the wheat yield was not stable. The nitrate storage in 0-200 cm soil after wheat harvest was significantly higher than that of the others, indicating an increasing risk of nitrate leaching. Early mulch under LW had the highest soil organic carbon (SOC) content and storage of SOC (SSOC) in 0-20 cm soil. For LMW, wheat yield was comparatively stable among years, because of higher water storage before wheat seeding, and the nitrate storage in 0-200 cm soil after wheat harvest was significantly lower than LW, which decreased the risk of nitrate leaching. Stalk mulch had higher SOC content in 0-20 cm soil after wheat harvest compared with moveaway. In addition, compared with the soil  when the experiment started, stalk much also increased SSOC in 0-20 cm soil. In conclusion, LMW with stalk mulch could increase soil water storage, stabilize crop yield, improve soil fertility and decrease 0-200 cm soil nitrate storage. This system could be treated as a good alternative for areas with similar climate.