测土推荐施肥适用技术路线的研究

Study on an applicable technical route for fertilizer recommendation based on soil testing

根据中国的土壤养分空间变异研究中反映的变异系数信息,分析了按代表性混合土样推荐施肥的方法可能出现的失误概率,提出了失误概率与变异系数之间的定量关系.研究结果表明,目前土壤主要养分的变异系数一般在30%以上,与现行的以共性为基础的测土推荐施肥技术路线比较,个性化测土蕴藏着接近50%的增产潜力.建议根据允许的施肥偏差,选择变异系数临界值;根据当地土壤养分空间变异情况选择适用的测土推荐施肥技术路线.

The failure probability of the fertilizer recommendations caused by testing the representative and mixed soil samples was analyzed, and the quantity relationship between the failure probability and the coefficient of variation was presented in this paper according to the coefficient of variation derived from the study on spatial variation of soil nutrients occurring in China. Study results show that the cur- rent coefficient of variation for testing main soil nutrients is greater than 30%. The potential output yielded by testing the individual samples will increase by 50% compared to the technical route for fer- tilizer recommendation based on testing overall samples. It indicates that the critical value of the varia- tion coefficient should be selected according to the permissible fertilization errors. The suitable techni- cal route for fertilization recommendation should be obtained by analyzing the spatial variation of soil nutrients.