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近年来,江苏沿海棉区,存在着超量施肥和超量化控的现象,亩施纯氮多达15～25公斤,化控次数达6次之多,亩用药量5克以上,造成亩投入过大,经济效益降低。为探明最佳用肥和最适化控量次,1983～1985年进行了合理经济施肥和定量定次化控试验。试验设亩施氮素7.5公斤、10公斤、12.5公斤、15公斤四个等级,每处理又分化
In recent years, the coastal cotton paddies in Jiangsu Province have over-fertilization and over-quantified control. As much as 15-25 kilos of pure nitrogen per acre are applied and the number of chemical control is more than 6 times. Mu dosage is more than 5 grams, resulting in the investment of mu Too large, economic benefits reduced. In order to find out the best fertilizer and the optimal control of the times, from 1983 to 1985 conducted a reasonable economic fertilization and quantitative fixed-dose chemical control test. Test set mu nitrogen nitrogen 7.5 kg, 10 kg, 12.5 kg, 15 kg four levels, each treatment and differentiation