• 主题
高级搜索  >
历史搜索 清空历史
首页> 中文期刊> 《土壤圈：英文版》 >Effects of Tillage and Crop Residue Management on Maize Yields and Net Returns in the Central Mexican Highlands Under Drought Conditions

Effects of Tillage and Crop Residue Management on Maize Yields and Net Returns in the Central Mexican Highlands Under Drought Conditions

         
页面导航
  • 摘要
  • 著录项
  • 相关主题

摘要

In the subtropical highlands of Central Mexico,where the main crop is maize(Zea mays),the conventional practice(CP) involves tillage,monoculture and residue removal,leading to soil degradation and unsustainable use of natural resources and agricultural inputs.Conservation agriculture(CA) has been proposed as a viable alternative in the region,based on reduction in tillage,retention of adequate levels of crop residues and soil surface cover and use of crop rotation.This study began in 2009 when the highlands of Central Mexico suffered from a prolonged drought during vegetative maize growth in July-August,providing an opportunity for the on-farm comparison of CA with CP under severe drought conditions which 21 climate change models projected to become more frequent.Under dry conditions,CA resulted in higher yields and net returns per hectare as early as the first and second years after adoption by farmers.As an average of 27 plots under farmers' management in 2009,the maize yields were 26%higher under CA(6.3t ha^(-1)) than under CP(5.0 t ha^(-1)).2010 was close to a normal year in terms of rainfall so yields were higher than in 2009 for both practices;in addition,the yield difference between the practices was reduced to 19%(6.8 t ha^(-1) for CA vs.5.7 t ha^(-1) for CP).When all the 2009 and 2010 observations were analyzed in a modified stability analysis,CA had an overall positive effect of 3 838 Mexican Pesos ha^(-1)(320 $US ha^(-1)) on net return and 1.3 t ha^(-1) on yield.After only one to two years of adoption by farmers on their fields,CA had higher yields and net returns under dry conditions that were even drier than those predicted by the analyzed 21 climate change models under a climate change scenario,emission scenario A2.

著录项

获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号