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三、四川省主要作物上施用锌、锰、硼、钼元素的试验研究和效果我省土类复杂,作物种类繁多。近年来由于农业持续增产,从土壤里取走的养分多,还入的少,加之氮、磷、钾施用的数量及比例不当,方法不合理,降低了土壤中微量元素的有效性,作物吸收的各种营养元素间的比例失调。因此,各地陆续出现了大面积的缺素症,如水稻坐蔸、油菜花而不实、玉米白苗花叶和小麦花叶死苗等。各地对这些缺素症由于不能正确识别,采用老办法防治,收效甚微,病情逐
Third, the main crops in Sichuan Province on the use of zinc, manganese, boron, molybdenum elements of the experimental study and the effect of soil complexity in our province, a wide range of crops. In recent years, due to the continuous increase in agriculture, more nutrients are taken from the soil and fewer nutrients are added. In addition, the quantity and proportion of nitrogen, phosphorus and potassium applied are improper. The method is irrational, reducing the availability of trace elements in the soil and crop absorption The imbalance between the various nutrients. Therefore, there have been a large number of emerging from all over the world, such as rice sit up, rape, but not real, white corn and white flower Miao Miao dead seedlings. Due to the lack of proper identification of these deficiencies and the prevention and treatment by the old methods,