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合理施肥可促进作物正常生长,增强其抗逆性;反之,施肥过量,易引起作物代谢失调,加重病虫为害程度。 一、合理施肥可减轻病虫为害。 作物在不同生育期,其所需肥料种类和数量不同,体内所含元素量亦各异。如水稻分蘖期,体内含氮最高,同时叶鞘和茎基部贮存的淀粉量最少,如果再施氮肥,体内就会有过剩的氮,易感染稻瘟病。因此此时不宜施氮肥。水稻缺硅时,稻瘟病和螟虫发生重。因为硅
Rational fertilization can promote normal crop growth and enhance its resistance; conversely, excessive fertilization can easily lead to crop metabolism disorders, increasing pest damage. First, a reasonable fertilization can reduce pests and diseases. Crops in different growth stages, the types and amounts of fertilizer required by the body contains different amounts of elements. Such as rice tillering stage, the highest nitrogen content in the body, while the leaf sheath and stem base storage of starch at least, if the nitrogen fertilizer, the body will have excess nitrogen, susceptible to blast. Therefore, nitrogen should not be applied at this time. Rice lack of silicon, rice blast and stem borer weight. Because of silicon