论文部分内容阅读
棉花追肥是多结铃、少脱落、提高产量的重要措施,除播种前施足底肥外,追肥是否得当,对棉花产量起重要作用。怎样才能提高追肥的效果呢? 1.要根据需肥规律追肥 棉花不同的生育阶段,对营养的吸收量不同。一般苗期棉株吸收量分别占一生吸收总量,氮6.36％,磷5.19％,钾9.62％;蕾期吸收量分别占一生总吸收量,氮34.95％,磷21.04％,钾31.31％;花铃期吸收量分别占一生总吸收量,氮56.88％,磷72.74％,钾55.88％。根据棉花需肥规律,掌握苗轻、蕾稳、花铃重、后补的追肥原则,667平方米苗期追尿素5千克,促苗生长;蕾期追尿素7.5千克,磷肥20千克,钾肥7.5千克,氮磷钾配合,使棉株稳长;花铃期
Cotton topdressing is more than boll, less shedding, an important measure to increase yield, in addition to sowing enough before sowing, top dressing is appropriate, plays an important role in cotton yield. How to improve the effect of top dressing? 1. According to the law of need fertilizer topdressing cotton at different stages of growth, the absorption of nutrients is different. The average absorption of cotton plants at seedling stage accounted for 6.36% of total nitrogen, 5.19% of phosphorus and 9.62% of potassium, respectively. The total absorption of buds during the bud stage was 34.95% of total nitrogen, 21.04% of phosphorus and 31.31% of potassium, respectively The total amount of absorption during the boll period accounted for 56.88% of total nitrogen, 72.74% of phosphorus and 55.88% of potassium, respectively. According to the law of cotton need fertilizer, grasping seedlings light, bud stability, flower boll weight, fill up the principle of top dressing, 667 square meters seedling recovery of urea 5 kg, promoting seedling growth; budding stage urea 7.5 kg, phosphate 20 kg, potassium 7.5 Kg, with NPK, so that cotton plants stable; flower boll stage