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五年定位监测的田间试验结果表明，施用有机肥料对土壤铁、锰、铜、锌的消耗具有明显的补充作用，但对有效用的补充仍显不足．因此，土壤硼营养有可能成为作物产量的限制因子．长期单施正要素化肥的土壤有效态铁、锰、铜、锌、硼的含量均明显下降，下降量达3mg／kg以上，其中土壤有效态硼则有潜在缺乏的可能．
Field experiment results of five years of location monitoring showed that the application of organic fertilizers could significantly replenish the consumption of iron, manganese, copper and zinc in the soil, but the available supplements were still inadequate. Therefore, soil boron nutrition may be a limiting factor in crop yield. The content of available iron, manganese, copper, zinc and boron in long-term single application of chemical fertilizers decreased obviously with the decrease of 3 mg / kg, while the available boron in soil was potentially lacking.