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 The main contradiction of wheat from low yield to high yield is the contradiction between the development of groups and individuals. To solve this contradiction, we mainly use reasonable and close planting methods and the use of fertilizers and other means to coordinate cultivation. Often seen in the production due to blindly fertilizing and sowing too large, resulting in late disease aggravating, lodging, production cuts and so on. In order to economically and reasonably use fertilizers, seeds, in order to maximize the economic benefits, since 1984 in Huaibei region organized scientific research units in collaboration with the pilot study. The test results are summarized later. First, the test profile The test were carried out in 10 units in Huaibei, respectively, according to the unified scheme with split design, fertilizer-based treatment (referred to as A factor), set Mushi nitrogen 5,10 and 15 kg (A_1, A_2, A_3 ); Density of the secondary treatment (referred to as the B factor, set the basic seedlings per mu 16,22 and 280,000 (B_1, B_2, B_3), a little bit different, as shown in Table 1. Community area 0.02-0.03 acres, Requirements in the local appropriate broadcast period, Qi Miao set point (each small