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.
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美
- 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。