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土壤有机质不仅影响到土壤一系列物理化学性质,而且是植物极重要的养料来源,其含量的高低一直被作为评价土壤肥力的重要指标。但是,也有一些土壤有机质含量与其实际的生产力之间并不呈现较好的相关性。从附表中5、6和7、8两组样品可以看出,土壤类型基本相似,有机质含量基本相同,常年产量却有较大的差异。而13号比15号和16号两样品的有机质低,但产量却大大超
Soil organic matter not only affects a series of physico-chemical properties of soil, but also is an important source of nutrients for plants. The content of soil organic matter has been used as an important indicator to evaluate soil fertility. However, there are also some soil organic matter content and its actual productivity does not show a good correlation between. As can be seen from the two sets of samples in Tables 5, 6 and 7, 8, the types of soils are basically the same, the organic matter contents are basically the same, and the perennial yields are quite different. On the 13th, the organic matter was lower than the 15th and 16th samples, but the yield was much higher than that of the 13th