一、试验经过与效果 1978～1979年镇江地区农科所主持开展了双三熟制早稻施肥技术协作研究,改过去“一轰头”施肥方法为适当减少前期肥,把追肥的重点放在保花肥上的新施肥法。1978年8组大田对比试验,新法平均亩产959.3斤,平均亩施肥量折纯氮24斤,比旧法增产7.8％,少用纯氮20％。1979年16组大田对比试验,新法平均亩产952.9斤,平均亩施肥量折纯氮29.1斤,比旧法增产8.6％,少用纯氮14.7％。按每生产100斤稻谷需纯氮计算,两年新法为2.6和3.1斤,分别比旧法减少1和0.8斤。 First, the test passed and the effect 1978-1979 years, led by the Agricultural Science Institute of Zhenjiang carried out a double three cooked early rice fertilization technology collaborative research, change the past, “a boom” fertilization method for the appropriate reduction of pre-fertilizer, the focus of top dressing insurance Fertilizer fertilizer on the new method. Eight groups of field trials in 1978, the new method average yield of 959.3 kg per mu, the average amount of acre fertilizer folded 24 kg, an increase of 7.8% over the old method, less use of pure nitrogen 20%. In 1979, 16 groups of field trials showed that the average yield per mu was 952.9 kg, and the average amount of acre fertilizer was 29.1 kg of pure nitrogen, an 8.6% increase over the old method and 14.7% less for pure nitrogen. According to the calculation of pure nitrogen for producing 100 kg of rice, the new method in two years is 2.6 and 3.1 kg, respectively, which are respectively 1 and 0.8 kg less than the old method.