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农作物生长发育要从土壤中吸收养分,虽然作物对各必需元素的需要量不同,但是它们在作物生长发育过程中的生理功能是同等重要的和不可替代的,当缺乏某种元素或某种元素过量时,作物体内一系列代谢活动就会受到障碍,严重时在外形上就会表现出特殊的病态,这种由营养失调所引起的生理病态称为缺素症。一般从形态上诊断缺素,如作物的根、茎、叶、花、果及种子等方面。1.症状特点如症状先在老叶上出现,说明缺乏的是氮、磷、钾、镁、
The crop growth and development need to absorb nutrients from the soil. Although the crops have different requirements for the essential elements, their physiological functions in the process of crop growth and development are equally important and irreplaceable. In the absence of certain elements or elements Excessive, the body of a series of metabolic activities will be obstacles, in severe cases will show a special pathological appearance, which is caused by malnutrition physiological disease called deficiency. Generally diagnosed from the lack of morphology, such as crop roots, stems, leaves, flowers, fruits and seeds and so on. 1. Symptoms such as symptoms first appeared in the old leaves, indicating the lack of nitrogen, phosphorus, potassium, magnesium,