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一、缺氮 1.氮的特点及在作物体内的作用。种子播种后,细胞的原生质体开始活动,生长就开始了。原生质体的蛋白质是和生命紧密相连的,其中含氮约16％,作物吸收无机氮和硝酸,就可以制造氨基酸,并进一步生成蛋白质。这种蛋白质含有22种氨基酸,这些氨基酸是维持生命的重要化合物。此外,还有叶绿素、酶、激素和核酸等在作物体内起重要作用的化合物中也含有氮。因此,作物生长时氮的存在,有助于根的发育,茎叶的伸长,使叶子呈绿色。氮在作物生长中有一定的比例,所以氮不足,生育会受到阻碍。
First, nitrogen deficiency 1. Nitrogen characteristics and role in the crop. After the seeds are sown, the protoplasts of the cells begin to move and growth begins. Proteins in protoplasts are closely linked to life, with about 16% of nitrogen present. Crops absorb inorganic nitrogen and nitric acid to make amino acids and further protein production. This protein contains 22 kinds of amino acids, these amino acids are important compounds to maintain life. In addition, there are also chlorophyll, enzymes, hormones and nucleic acids that also play important roles in the crop, including nitrogen. Therefore, the presence of nitrogen during crop growth contributes to root development, stem and leaf elongation, and leaves green. There is a certain proportion of nitrogen in crop growth, so nitrogen deficiency, fertility will be hindered.