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为了探讨北京地区秋播大白菜品种、播种期、密度和追肥量等因素的最佳处理组合,以期尽可能地提高一、二级净菜产量,获得更好的经济效益,我们于1990年秋在本所试验基地进行了正交试验,现将试验情况简报如下: 一、试验方法本试验设四个因素,每个因素设三个水平。A因素为品种,分别是:“北京106”(A_1)。“北京新1号”(A_2),“北京新2号”(A_2)B因素为密度(株/亩),分别为2300(B_1),2000(B_2),1700(B_3);C因素为追肥量(公斤/亩),分别施尿素,折合硫铵为150(C_1),100(C_2),50
In order to explore the best treatment combinations of autumn-sowed Chinese cabbage varieties, sowing date, density and topdressing amount in Beijing, in order to improve the output of first and second grade net vegetables as much as possible and get better economic benefits, The test base were orthogonal test, the test situation is now briefed as follows: First, the test method The test set four factors, each setting three levels. A factor for the variety, namely: “Beijing 106” (A_1). The factors of “A 2” and “A 2” in Beijing were density (strains / acre), which were respectively 2300 (B_1), 2000 (B_2) and 1700 (B_3) The amount of urea (kg / acre), urea were applied, equivalent to ammonium sulfate 150 (C_1), 100 (C_2), 50