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试验于1989～1990年在南宫市进行,地力中上等。试验采用4因素5水平2次通用旋转回归设计方法。m_c=16,m_o=7,m_r=8,共设31个试验小区,其中m_o等间距排列,m_r、m_c随机排列。研究播期(x_1)、密度(x_2)、尿素追施量(x_3)、磷酸二铵底施量(x_4)对产量的影响及彼此关系。每小区8行,每行5m长,行距0.5m,小区面积20m~2。
The experiment was carried out in Nangong City from 1989 to 1990 with the best ground force. The experiment adopted four factors and five levels and two general rotation regression design methods. m_c = 16, m_o = 7, m_r = 8, a total of 31 experimental plots, of which m_o equally spaced arrangement, m_r, m_c randomly arranged. The effects of sowing date (x_1), density (x_2), topdressing amount of urea (x_3) and bottom dosage of diammonium phosphate (x_4) on yield were studied. Each cell 8 lines, each line 5m long, spacing 0.5m, cell area 20m ~ 2.