用肥料和生长调节剂处理棉花种子及叶面喷施(或涂茎),既能增产,又能提高纤维品质,而且简便易行,是一项投资小而收益大的技术措施。 一、肥料在棉花上的应用 1.喷尿素 在棉花生育后期每隔7～10天,喷施一次0.2～0.3％的尿素液,连喷2～3次,可防止早衰,提高成铃率,增产10％左右。 2.施磷酸二氢钾 用0.2％的磷酸二氢钾浸棉种18～20小时后捞出,晾干后播种。在蕾期、花期、铃期各喷一次0.3～0.4％磷酸二氢钾,可增产10％以上。 3.施微肥 (1)硼肥。在盛蕾期、初花期、盛花期各喷一次0.2％的硼砂或0.1％ Fertilizers and growth regulators for cotton seed and foliar spray (or painted stems), both to increase production, but also improve fiber quality, and easy, is a small investment and large gains in technical measures. Fertilizer application on cotton 1. Spraying urea in the late growth period of cotton every 7 to 10 days, spraying a 0.2 to 0.3% urea solution, and even spray 2 or 3 times to prevent premature aging and improve the rate of boll, Increase about 10%. 2. Potassium dihydrogen phosphate with 0.2% potassium dihydrogen phosphate soaked cotton 18 to 20 hours after the fish, dried and sown. In the bud, flowering, bell spray each 0.3 to 0.4% potassium dihydrogen phosphate, can increase yield of 10%. 3. Fertilizer (1) boron fertilizer. In the Sheng Lei stage, the first flowering, flowering each spraying a 0.2% borax or 0.1%