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为明确大田条件下旱莲草对水稻生长和产量的影响和为其防治提供有效经济参数,采用添加系列试验和模型拟合的方法研究不同旱莲草密度下水稻田间透光率、水稻株高和产量性状的变化。当旱莲草密度≥2株/m2时,田间透光率显著降低,且随着旱莲草密度增加,水稻有效穗数、穗长、穗粒数等显著降低,空粒率显著增加,导致产量显著下降。二次曲线模型y=-0.0189x2+2.3546x+2.0819能很好地拟合旱莲草密度与水稻产量损失间的关系。人工拔除方法和10%苄嘧磺隆WP防除旱莲草,其经济危害允许水平分别为22.22%和4.67%,经济阈值分别为9.3株/m2和1.1株/m2。
In order to clarify the effect of Eclipta prostrata on the growth and yield of rice under field conditions and to provide effective economic parameters for its control, the series of experiments and model fitting methods were used to study the transmissivity, rice plant height And changes in yield traits. When the density of Eclipta greater than 2 plants / m2, the light transmittance decreased significantly in the field. With the increase of the density of Eclipta prostrata, the effective panicles, spike length and grains per spike of rice decreased significantly, Production dropped significantly. The quadratic curve model y = -0.0189x2 + 2.3546x + 2.0819 can well fit the relationship between the density of Eclipta prostrata and the yield loss of rice. The economic hazard of artificial removal method and 10% bensulfuron-methyl WP for controlling Eclipta prostrata were 22.22% and 4.67%, respectively. The economic thresholds were 9.3 plants / m2 and 1.1 plants / m2 respectively.