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水稻生长过程中必需的营养元素有三大特点:一是该元素是所有作物完成生活周期所不可缺少的;二是缺少这种元素时作物表现出缺素症状,唯有补充它后才能恢复正常,要预防缺素症;三是必需的元素在作物营养上具有直接作用的效果,而不是由于它改善了作物生长条件所产生的间接效果。以上三条是判断作物生长必需的营养元素的标准。下面主要介绍氮、磷、钾、锌、硫、硅、铁等七种植物必需的营养元素。1、氮素
There are three characteristics of essential nutrients in the process of rice growth: First, the element is indispensable to the complete life cycle of all the crops; second, when the element is missing, the crop shows the symptoms of deficiency, and only after supplementing it can it return to normal. Preventing deficiency deficiency; Third, the necessary elements have a direct effect on crop nutrition, not because it improves the indirect effects of crop growth conditions. The above three are the criteria for determining the nutrient elements necessary for crop growth. The following describes the nitrogen, phosphorus, potassium, zinc, sulfur, silicon, iron and other nutrients necessary for the seven plants. 1, nitrogen