Welcome to Chinese Agricultural Science Bulletin,

Chinese Agricultural Science Bulletin ›› 2022, Vol. 38 ›› Issue (7): 80-85.doi: 10.11924/j.issn.1000-6850.casb2021-0390

Special Issue: 土壤重金属污染

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Effects of Milk Vetch Returning to Field on the Content of Soil Nutrient and Heavy Metal

CHEN Hui1(), ZHOU Xiaoyue2, TAN Cheng2, ZHANG Yongchun3, WANG Jidong3, MA Hongbo3()   

  1. 1Nanjing Liuhe District Agricultural Technology Extension Center, Nanjing 210044
    2College of Horticulture, Hainan University, Haikou 570228
    3Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences/ Scientific Observing and Experimental Station of Arable Land Conservation, Ministry of Agriculture and Rural Affairs, Nanjing 210014
  • Received:2021-04-12 Revised:2021-10-29 Online:2022-03-05 Published:2022-04-13
  • Contact: MA Hongbo E-mail:491786371@qq.com;274579992@qq.com

Abstract:

To improve the soil quality under rice-wheat rotation in Liuhe, a field experiment of milk vetch-rice rotation (2018 to 2020) was conducted to study the effects of milk vetch returning on the content of soil nutrient and heavy metal in paddy field. Two rotation patterns were designed: milk vetch-rice rotation and wheat-rice rotation. The results of this study showed that compared with wheat-rice rotation, milk vetch-rice rotation effectively increased soil nutrients, including total nitrogen, organic matter, available potassium, exchangeable calcium, available sulfur, available manganese, available zinc and available molybdenum, improved soil structure (soil bulk density decreased from 1.32 g/cm3 to 1.21 g/cm3), alleviated soil acidification (soil pH increased from pH 6.36 to pH 6.51), and reduced the soil pollution of total Cr, Pb, As, and Hg. In conclusion, milk vetch-rice rotation could effectively reduce the amount of fertilizer applied in winter wheat field and improve soil quality, which is a promising fertilization mode for Liuhe rice planting area.

Key words: milk vetch, soil nutrient, soil heavy metal, evaluation on soil quality, tillage mode, fertilizer reduction

CLC Number: