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1.病征:泥炭圭、黑泥土等有机物集聚过多的湿田以及多量施用紫云英,大豆饼、绿肥等的水田,插田后二至三周,气温急剧上升,则水稻的生育衰退;伸长缓慢,下叶稍变黄,同时发生赤褐色、不定形的斑点,不规则的密布如铁锈状,以后则下叶枯萎。取其根观察,多变黑色腐败,有时土壤也呈黑色。2.原因:钾缺乏则本病发生,氮素量多则赤枯病增加。因为吸收进入稻体内的氮素由氨基酸合成蛋白质时,钾是必要,即稻体内的氮与钾的平衡极关重要。钾的吸收量对比氮的吸
Symptoms: Peatland, black soil and other organic matter accumulated too much wetland and the amount of application of asparagus, soybean meal, green manure and other paddy fields, two to three weeks after the intercropping, the temperature rose sharply, the fertility of rice decline; Long slow, the next leaves slightly yellow, while the occurrence of auburn, amorphous spots, irregular clouds such as rust-like, then under the leaves withered. Take root observation, changeable black corruption, and sometimes the soil is black. 2 reasons: the lack of potassium is the occurrence of this disease, the amount of nitrogen is more than the increase of the dry blight. Because absorption of nitrogen into the rice body by the amino acid synthesis of protein, potassium is necessary, that is, the balance of nitrogen and potassium in rice is very important. The amount of potassium absorbed compared to the nitrogen absorption