杂交中籼汕优63、汕优6号和常规中籼910、75632是湖北省拟大面积种植的优良中稻品种。1985年,我们选择代表性种植地区中等肥力的土壤,研究了不同用N水平,对以上品种的产量构成及干物质积累分配的影响。以摸清各品种适宜的N肥用量,指导生产。现把研究结果整理于后。试验设计与实施方法试验设在京山县永兴三队。土壤母质为第四纪沉积物,土名薄隔黄土田。供试田块土壤含有机质2.53%、全氮0.136%、速效氮107ppm、速效磷4.5ppm、速效钾115ppm。试验处理:CK为完全不施肥对照。N_1PK、N_2PK和N_3PK处理中,分别亩施纯N为N_1—7.5公斤、N_2—10.5公斤、N_3—13.5公斤、磷钾肥用量相同,分别为亩施P_2O_55公斤、、K_2O_4公斤。N肥按基肥50%、分蘖肥30%、保花肥20%的比例施入。P肥作耖口肥一次施入。K肥按基肥50%、促花肥50%的比例施入。田间排列:采用裂区设计,肥料为主区,品种为副区,主区面积为44m~2(8.8m× The middle-indica hybrid rice Shanyou 63, Shanyou 6 and conventional middle-indica 910,75632 were excellent middle-sized rice varieties to be planted in large area in Hubei Province. In 1985, we selected moderately fertile soils from representative growing areas to study the effects of different N levels on the yield components and dry matter accumulation and distribution of these varieties. To find out the appropriate amount of N fertilizer for all varieties, to guide the production. Now the research results are arranged in the post. Test design and implementation of the test method is located in Jingshan County Yongxing three teams. The parent material for the Quaternary sediments, thin soil loess plateau. Soil for test field plots containing organic matter 2.53%, 0.136% total nitrogen, available nitrogen 107ppm, available phosphorus 4.5ppm, available potassium 115ppm. Test treatment: CK is completely non-fertilization control. Among N_1PK, N_2PK and N_3PK treatments, N were N_1-7.5kg, N_2-10.5kg and N_3-13.5kg respectively, with the same amount of P and K fertilizers, which were P_2O_55kg and K_2O_4kg, respectively. N fertilizer based on 50% of base fertilizer, tillering fertilizer 30%, Paul fertilizer 20% of the rate applied. P fat fertilizer for fertilizer once applied. K fertilizer by 50% of basal fertilizer, fertilizer 50% of the rate of fertilizer applied. Field arrangement: the split zone design, fertilizer-based area, the varieties for the sub-district, the main area of ​​44m ~ 2 (8.8m ×