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我分院地处桂北山区,农田母质多属于第四纪红土,由于受附近石灰岩以及常年施用石灰的影响,水田土壤一般为中性至微碱性反应。1977年部分早稻出现不同程度的赤枯病。经调查诊断,主要由于土壤有效钾含量低导致植株缺钾所引起。一、主要病状早稻赤枯病出现的迟早,在不同田块是有差异的,有的出现于分蘖初期,有的出现于分蘖末期,但多数出现于分蘖盛期至分蘖末期。病状最初表现为生长减缓,比正常植株显著矮小,分蘖减少,上部叶片挺直,与
My branch is located in the mountains of northern Guangxi, farmland parent material mostly belong to the Quaternary laterite, due to limestone affected by the nearby and year-round application of lime, paddy soil is generally neutral to slightly alkaline reaction. In 1977, some of the early rice appeared different levels of the dead leaf blight. After investigation, it is mainly caused by the potassium deficiency caused by the low available potassium in soil. First, the main symptoms Early rice emergence of early and late, in different plots are different, some appear in the early tillering, and some appear in the late tillering stage, but most appear in tillering to the end of tillering. Symptoms initially manifested as slowing of growth, significantly shorter than normal plants, reduced tillers, upright leaves, and