Bothe the total nutrient quantities and crop yieldswere regressed. As a result,each efficient coefficient was not affected by some relatedsoil nutrients so that the avaerage model in the ecological zone can be established.

• 以养分总量与作物产量进行回归，其模式各效应系数不受土壤有关养分含量的影响，可以建立生态区的平均模式。