论文部分内容阅读
棉花早衰每年都有不同程度的发生。轻度早衰表现为花开上顶,主茎上部变细呈尖顶,果枝短小,空果枝多。早衰严重时,主茎顶尖干枯,上部果枝叶片变褐枯焦,蕾铃大量脱落或干瘪瘦小。早衰使秋桃减少,铃重降低,一般减产10—20%,严重者达30—40%。棉花早衰的根本原因是营养不良;而造成营养不良的原因则是多方面的。是天旱。蕾花期地上地下部急剧生产,需肥需水量大,此时若缺水,不仅影响棉株水分生理,土壤中可溶性养分也相对减少,使棉株营养受到影响。二是缺肥,尤其是有机肥和钾肥。有机质含量低于1%或速效钾含量低于100PPm 的轻壤土和
Cotton premature aging occurs to varying degrees each year. Mild Premature Senility showed flowers on top, the upper part of the main stem was thinned spire, fruiting branches short, empty fruiting branches and more. Serious premature senility, the top of the main stem dry, the upper fruiting leaves brown and dry coke, a large number of buds fall off or shriveled lean small. Premature aging to reduce the autumn peach, boll weight reduction, the general reduction of 10-20%, severe cases up to 30-40%. The underlying cause of cotton premature aging is malnutrition; the cause of malnutrition is multifaceted. It is drought. In the bud stage, the aboveground and underground parts are produced rapidly, requiring large amount of fertilizer and water. If water is lacking at this time, not only the moisture physiology of the cotton plants is affected, but also the soluble nutrients in the soil are relatively reduced, which affects the nutrition of cotton plants. Second, lack of fertilizer, especially organic fertilizer and potassium. Light loam with less than 1% organic matter or less than 100 ppm available potassium