淮北地区冬小麦亩产300—400公斤播种密度与施氮量的研究

<正> 小麦由低产变高产的主要矛盾,是群体与个体之间发育的矛盾。解决这一矛盾,主要是在栽培措施上采用合理密植、运用肥水促控等手段来加以协调。在生产中常可见到由于盲目施肥和播量过大,而造成后期病害加重、倒伏、减产等现象。为了经济合理地用肥、用种,以便发挥最大的经济效益,自1984年起在淮北地区组织有关科研单位协作进行了该项试验研究。现将试验结果汇总于后。一、试验概况试验分别在淮北地区10个单位进行,按统一方案用裂区设计,以肥料为主处理(简称A因素),设亩施纯氮5、10和15公斤(A_1、A_2、A_3);密度为副处理(简称B因素,设每亩基本苗16、22和28万(B_1、B_2、B_3),个别点稍有差别,详见表1。小区面积0.02—0.03亩,播期要求在当地适播期内,齐苗后定点(每小

STUDY ON THE SOWING DENSITY AND NITROGEN APPLICATION TO WINTER WHEAT OF 300—400KG PER MU IN HUAIBEI AREA

The results indicated that effect of the sowing density and nitrogen application on wheat yield are in connection with soil fertility in Huaibei area. In this experiment, on the level of soil fertility with the yield of 300kg per mu on non-fertilizer condition, wheat yield may be reduced by the increase of nitrogen, but effect of the sowing density is not marked. With the increase of nitrogen, the yield is improving on the level of fertility with 200—300kg per mu, the suitable density for high yield is about 220000 seedling per mu, on the level of fertility with 150kg per mu, the yield is raising by the increase of nitrogen and the radical seedling If the nitrogenous ferfility is increased, the ear and grain will increase, too, but 1000-grain weight may be reduced. With the increase of density, the number of ear may be increased, but ear grain and 1000-grain weight reduced.