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1966年前后本队棉花产量均在150斤左右,但近四年来却徘徊在80～90斤之间,从产量因素分析,主要表现在单铃重的减轻。据测定,近几年平均单铃重只有3克左右,比过去约降低了30％。究其原因,除不良气候影响外,1.棉田间套作的复种指数的提高,造成逐年浅耕影响棉根发育;2.排水不良,多雨造成积水,引起上层土壤含盐量上升,影响棉根发育,导致棉株早衰;3.有机肥少,偏施氮肥使棉花生长不稳,后期倒伏;4.棉田土壤中含钾量下降。试验证明,土壤缺钾对棉根的发育、棉株的抗病、抗倒以及后期早衰均产生明显的不良影响。棉铃发育的好坏与棉根发育的好坏关系最密切,各种影响棉根发育的外因条件都在不
Before and after 1966 cotton production in the team are about 150 pounds, but hovering in the past four years, 80 to 90 pounds, from the yield factor analysis, mainly in the reduction of single boll weight. It is determined that in recent years the average single boll weight is only about 3 grams, about 30% lower than in the past. The reason for this is that in addition to the adverse climate effects, 1. The increase of mulching index in intercropping of cotton fields results in the development of cotton roots by shallow tillage year after year; 2. The poor drainage and rainy rains cause water accumulation, which causes the salt content of upper soil to rise, affecting Cotton root development, leading to premature cotton plant; 3. Organic fertilizer less, partial nitrogen fertilizer so that cotton growth instability, the late lodging; 4. Cotton soil potassium decreased. Experiments show that soil potassium deficiency on cotton root development, cotton plant disease resistance, lodging and premature aging have a significant adverse effect. The development of cotton bolls is closely related to the development of cotton bolls. The external factors that affect the development of cotton bolls are not