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Chinese Agricultural Science Bulletin ›› 2023, Vol. 39 ›› Issue (5): 100-108.doi: 10.11924/j.issn.1000-6850.casb2022-0107

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Response of Soil Available Nutrients and Bulk Density to Straw Returning in North China

SUN Liyang1,2(), XU Minggang2,3(), WANG Jinfeng2, LI Jianhua2, LIU Ping1, SUN Nan3()   

  1. 1 College of Resources and Environment, Shanxi Agricultural University, Taigu, Shanxi 030800
    2 Academy of Eco-environment and Industrial Technology, Shanxi Agricultural University/Key Laboratory of Soil Environment and Nutrient Resources, Shanxi Province, Taiyuan 030031
    3 Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences/Key Laboratory of Arable Land Quality Monitoring and Evaluation, Ministry of Agriculture and Rural Affairs, Beijing 100081
  • Received:2022-02-21 Revised:2022-04-28 Online:2023-02-15 Published:2023-02-06

Abstract:

To explore the effects of straw returning on soil available nutrients and bulk density in north China, we set the keywords ‘straw returning’, ‘physical and chemical properties’, ‘north China’, ‘northeast China’ and ‘northwest China’ in databases such as CNKI and Wanfang. 60 literature about the effects of straw returning on crop yield and soil improvement and the influencing factors were screened. Meta-analysis was conducted to quantitatively study the response of soil available nutrients and bulk density to straw returning and the influencing factors. The results showed that straw returning could significantly (P<0.05) increase the content of soil organic carbon, alkali-hydrolyzable nitrogen and available potassium, and reduce soil bulk density to a certain extent. The improvement of soil available nutrients by straw returning in north China was significantly higher than that in northeast China and northwest China. The reduction effect on soil bulk density in northwest China was lower than that in north China and northeast China. Medium and high amounts of straw returning (5000-10000 kg/hm2 and 10000-15000 kg/hm2) could significantly increase the content of soil organic carbon, alkali-hydrolyzable nitrogen and available potassium. Low amount of straw returning (≤5000 kg/hm2) had no significant effect on soil bulk density, while ultra-high amount of straw returning (>15000 kg/hm2) significantly decreased soil bulk density (P<0.05). Compared with rotary tillage, deep tillage and shallow tillage, no tillage could significantly (P<0.05) increase the content of soil organic carbon, alkali-hydrolyzable nitrogen and available potassium. In addition, deep tillage could significantly (P<0.05) decrease soil bulk density. Both wheat and corn straw had significant effects on the improvement of soil bulk density and available nutrients, but there was no significant difference between the two kinds of straw. Returning medium and high amounts of straw to field combined with no tillage could significantly increase soil basic nutrients’ contents and improve soil physical and chemical properties, which is a reasonable way to promote soil fertility in north China.

Key words: straw returning, available nutrients, soil bulk density, north China, Meta-analysis