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1.棉花在不同的生长发育阶段需要不同的外界条件。采取开沟排水、合理灌溉、早施苗肥、稳施蕾肥、重施铃肥、适时摘心、整枝打叶等各种措施。克服春寒死苗、梅雨疯长、伏旱增加脱落和减轻铃重、秋雨烂铃等不利外界条件。正确处理个体与群体的关系,实现棉花高产。 2.棉花高产必须做到苗期早发,蕾期稳长和铃期不早衰。具体要求是四月底全苗,六月中现蕾,八月下旬吐絮。技术上的关键是争时间,争光照,促壮根,长势稳。根据1967—1974年对28块高产田的资料分析,亩产皮棉200斤,一般每亩种植4500株,株高100厘米左右,果枝15个以上,单株果数50个左右,每亩总铃数65000左右,上中下三部位的百铃重平均为458克,中期花平均衣分39.4％,大暑前(7月23日)成铃占总铃数的78.6％。盛花期的叶面积系数为3.5左右。 3.生长正常和长势差或生长过旺的棉株在不同的生育时期有不同的形态结构。根据各生育期的株高日增长量,红茎比例、自上而下第4叶中部的宽度、叶色、碳氮比等指标,在蕾期(6月中下旬)、花期(7月中旬)、和铃期(8月下旬)采取相应的栽培措施,使棉株符合高产的形态指标。
1. Cotton requires different external conditions at different stages of growth and development. To take ditching drainage, irrigation, as early as Miao Shi, Wen Shi Lei fertilizer, heavy bell fertilizer, in time topping, pruning leaves and other measures. To overcome the cold winter seedlings, plum rain soaring, volt increase loss and reduce boll weight, autumn rotten bell and other adverse external conditions. Correctly handle the relationship between individuals and groups to achieve high yield of cotton. 2. High-yielding cotton must be early seedling stage, bud stage and the premature aging is not premature. The specific requirements of the whole seedlings by the end of April, bud in June, in late August boll. The key is to fight for technology time, strive to light, promote strong roots, steady growth. According to the analysis of the data of 28 high-yield fields from 1967 to 1974, the average yield of lint per mu was 200 kg, and the average planting acreage was 4,500 plants per acre. The plant height was about 100 centimeters and the fruiting branch was more than 15 with about 50 per plant. The average number of hundred bellies was 458 grams in the middle, middle and lower parts, with an average of 39.4% in the middle period and 78.6% of the total number of bolls in the summer days (July 23). The full-flowering leaf area coefficient of about 3.5. 3. Normal growth and growing or over-growing cotton plants in different stages of growth have different morphological structure. According to the growth rate of plant height, proportion of red stem and stem, width of middle fourth leaf from top to bottom, leaf color and C / N ratio, ), And boll stage (late August) to take the corresponding cultivation measures, so that cotton plants meet the high yield of morphological indicators.