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棉花是一大传统优势作物,同时又是要求栽培技术较强的农作物。特别是近年来新品种新技术的推广应用以及产量品质的提高,在棉花种植和管理中,暴露出一系列问题。主要表现有:一是把握不准最佳播种期,不能保证一次播种拿全苗;二是密度不合理,即肥地密度偏高,薄地密度偏低;三是水肥管理偏晚,底肥不足或单一;四是打顶晚,化控
Cotton is a large traditional dominant crop, and at the same time it is a crop requiring strong cultivation techniques. Especially in recent years, the popularization and application of new varieties of new technologies and the improvement of yield and quality have exposed a series of problems in cotton cultivation and management. The main performance are: First, grasp the best sowing time is not allowed, can not guarantee a sowing all the seedlings; Second, the density is unreasonable, that is, the high density of fat, thin to low density; Third, water and fertilizer management late, lack of fertilizer or Single; Fourth, topping late, chemical control