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有机无机氮配比连续施用,土壤有机质及养分含量随有机肥比例增加而提高,养分比例更趋协调,含量与比例的差异形成了土壤肥力梯度,因而各具不同的生产潜力和肥效反应。4年比较,两肥配施其残效较单施氮肥增产25.6～44.3％,有机肥比例愈大,后效持续期愈长。随着肥力梯度的增高氮效愈加明显,而磷、钾效果显著下降。
The ratio of organic to inorganic N was continuously applied. The content of soil organic matter and nutrients increased with the increase of organic manure, and the proportion of nutrients was more coordinated. The difference of content and proportion formed the gradient of soil fertility, which resulted in different production potentials and fertilizer responses. Compared with the single application of nitrogen fertilizer, the residual effect of two-fat fertilizer application increased by 25.6-44.3% over the past four years. The larger the proportion of organic fertilizer was, the longer the after-effect duration was. With the increase of fertility gradient, the effect of nitrogen increased more obviously, while the effect of phosphorus and potassium decreased significantly.