论文部分内容阅读
本试验开始前五年,我省棉花播种面积为157.4～176.8万亩,播面亩产为19～29 kg,1kg 纯氮生产皮棉约4～5 kg,有的高产田块,亩施纯氮常达50余kg,争取亩产皮棉150 kg,1 kg 纯氮生产皮棉不过3 kg 左右,可见大面积棉花平均亩产和个别高产田块的氮肥经济效益都较低。据中棉所蒋国柱等(1981)报导,当时国内(?)高产试验田已达到125 kg 以上,甚至接近150 kg水平”。又上海市南汇县泥城公社1967～1974年28块亩产皮棉100 kg 的高产田块,平均亩施纯氮17.75kg,每公斤纯氮生产皮棉为5.63 kg。可见我省的棉花亩产及氮肥经济效益的增长潜力都很大,特别是稻棉轮作,
Five years before the start of this experiment, the cotton sown area in our province was 157.4-176.8 mu, the sown area per mu was 19-29 kg, and 1 kg of pure nitrogen was about 4-5 kg. Some high yield plots, Often more than 50 kg, strive for 150 kg of lint per mu, 1 kg of pure nitrogen but only about 3 kg of lint, showing that the average area of ?? cotton per mu and individual high yield of nitrogen fertilizer economic benefits are low. According to the report of Chiang Guozhu et al. (1981), when the high-yield experimental field in China reached more than 125 kg and even approached the level of 150 kg, another 28 kg mu of lint from 1967 to 1974 in Nanhui County, Shanghai was 100 kg Of high-yield plots, the average Mushi nitrogen 17.75kg, kg of pure cotton per kilogram of 5.63 kg. Shows that the province’s cotton yield per acre and economic benefits of nitrogen fertilizer have great potential for growth, especially rice cotton rotation,