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农作物在生长发育过程对碳、氢、氧、氮、磷、钾等需要量较多,一般称常量元素肥料。而对钼、硼、锌、锰、铜等需要量很少,叫做微量元素肥料。一般土壤中并不缺乏微量元素,但是它们在土壤中变化幅度很大,有时可达100倍左右。如碱性土壤容易缺硼、锌、铜等,酸性土壤中,有效钼常与土壤中游离铁、铝作用而沉积,所以需要施钼肥,或施用石灰中和土壤中的酸以减少钼的固结,提高有效钼的含量。此外,随着复种指数的增加,微量元素也会出现
Crops in the process of growth and development of carbon, hydrogen, oxygen, nitrogen, phosphorus, potassium and other needs more commonly known as the elemental fertilizer. The molybdenum, boron, zinc, manganese, copper and other small amounts of demand, called trace element fertilizer. The general soil is not lack of trace elements, but they vary greatly in the soil, sometimes up to 100 times. Such as alkaline soil easily boron, zinc, copper, acidic soil, the effective molybdenum and iron in the soil often free of iron and aluminum deposition, so the need for molybdenum fertilizer, or the application of lime and soil acid to reduce the molybdenum Consolidation, improve the effective molybdenum content. In addition, trace elements also appear as the multiple crop index increases