Meta Analysis of Cover Crops Effects on Corn Yield under Rotation and Intercropping Regimes in North America and Northern China
A meta-analysis was conducted to summarize the effects of cover crops on corn yield under rotation and intercropping in North America and northern China.The results showed that corn yield in rotation with cover crops was significantly increased by 5.9％on average,while a yield reduction of 2.5％was found under intercrop-ping.Planting of legume,brassica and mixture of cover crops increased subsequent corn yield on average by 13.0％,1.6％and 18.1％,respectively.While planting of grass cover crops decreased yield by 2.7％.Intercropping with le-gume cover crops resulted in an average yield increase of 8.1％compared to corn monoculture in northern China,while an average yield reduction of 9.6％was found in North America.The results of this study suggested that rota-tion with cover crops had positive effect on corn yield both in North America and northern China,and mixed sowing of grass,legume and brassica was the most beneficial.
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万方数据
