近几年来,氮素化肥的用量逐年增加,1964年亩用量为154斤,1981年亩用量为365.6斤,17年共增加211.5斤。但粮、棉、油产量却徘徊不前。为此,我们于1981年在市化肥协作网的指导下,组织庄行(青黄土)、江海(沟干泥)、头桥(黄泥头)等公社,在早稻、后季稻上进行了碳铵适宜用量的试验。试验设有机肥区(早稻、后季稻),不施肥作对照。早稻亩施不同用量碳铵60、90、120、150、180斤;后季稻为60、90、120、150斤。随机排列,三个重复,小区面积0.1亩。产量均为小区实产。小区间筑小堤岸,各设独立的两用排灌,避免水肥相互流通影响试验可靠性。基肥施猪塮25～30担/亩, In recent years, the amount of nitrogen fertilizer increased year by year, 1964 mu amount of 154 pounds, 1981 acres of 365.6 kg, a total increase of 211.5 pounds 17 years. However, grain, cotton and oil output have stagnated. To this end, we organized communes such as Chongzhuang (Qing Loess), Jianghai (Dugang Mudao) and Tiaqiao (Huangni Tou) under the guidance of the Municipal Fertilizer Collaboration Network in 1981, The appropriate amount of ammonium bicarbonate test. Experimental area with organic fertilizer (early rice, after the third season rice), no fertilization as a control. Early rice MU Shi different amounts of ammonium bicarbonate 60,90,120,150,180 pounds; the latter quarter of rice is 60,90,120,150 pounds. Random arrangement, three repetitions, the plot area of ​​0.1 acres. Production are real estate area. Small embankment between the block, each with a separate dual-purpose irrigation and drainage, to avoid the flow of water and fertilizer affect the test reliability. Basal fertilizer pigsty 25 ~ 30 Tam / mu,