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试验采用二因素五水平二次回归通用旋转组合设计,研究野燕麦(Avena fatua)(x_1)、遏兰菜(Thlaspi arvense)(x_2)不同密度的复合群体与小麦减产率((?) y)、穗数减少率((?)s)、穗粒数减少率((?)g)等指标函数间的变化规律。结果表明,野燕麦密度是影响产量的主要因子,遏兰菜密度是次要因子。野燕麦、遏兰菜密度与小麦减产率、穗数减少率、穗粒数减少率在试验范围内呈正相关关系;小麦减产率回归方程为:(?)y=20.70+6.0913x_1+3.1563x_2+4.3250x_1 x_2-2.1355x_1~2+0.7995x_2~2野燕麦和遏兰菜种群,每 m~2在7.7株和5株、7.7株和26.3株、35.7株和5株时,不造成小麦穗数减少,可不进行化学防除;在野燕麦每 m~2超过35.7株和遏兰菜超过26.3株的复合群体,需要做好防除工作。
In the experiment, a two-factor and five-level quadratic regression general rotation combination design was used to study the yield reduction of wheat (A yd), Avena fatua (X_1) and Thlaspi arvense (x_2) , The decrease rate of spike number ((?) S), and the decrease rate of spike grain number ((?) G). The results showed that the density of wild oat was the main factor affecting the yield, and the density of orchid was the secondary factor. The density of wild oat and korean orchid had a positive correlation with the decrease rate of wheat yield, the decrease rate of spike number and the reduction rate of spike grain number within the experimental range. The regression equation of wheat yield was: (?) Y = 20.70 + 6.0913x_1 + 3.1563x_2 + 4.3250x_1 x_2-2.1355x_1 ~ 2 + 0.7995x_2 ~ 2 wild oat and orchidaceous larvae population, each m ~ 2 in 7.7 and 5 strains, 7.7 strains and 26.3 strains, 35.7 strains and 5 strains, does not cause the number of wheat spikes Reduce, can not be chemical control; in wild oats more than 35.7 per m ~ 2 and more than 26.3 CranAge composite population, need to do a good job of control.