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由于丰产栽培,土壤各种养分的耗用量增加,这就要求恢复和提高土壤有效肥力和潜在肥力。研究指出:系统施肥可防止土壤腐殖质含量下降,有机肥比化肥更容易达到这个要求。而增施有机肥则可提高土壤腐殖质含量。季米里亚捷夫农科院的定点试验表明,62年内施肥与定期施用石灰相配合,使生草灰化土一米深度内腐殖质和氮素大大增加。与原来
As a result of high yield cultivation, soil nutrient consumption increased, which requires the restoration and improvement of soil available fertility and potential fertility. The study pointed out: System fertilization can prevent soil humus content decline, organic fertilizer easier than fertilizer to achieve this requirement. The application of organic fertilizer can increase soil humus content. A pilot study by the JIMIR Academy of Agricultural Sciences showed that 62 years of fertilization combined with regular application of lime resulted in a substantial increase in humus and nitrogen within one meter depth of raw grass grained soil. With the original