| 大豆与杂草竞争临界期研究初报 |
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| 引用本文： | 张洪进,张夕林.大豆与杂草竞争临界期研究初报[J].大豆科学,1992,11(3):273-276. |
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| 作者姓名： | 张洪进 张夕林 |
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| 作者单位： | 江苏省南通县植保站
(张洪进，张夕林)，江苏省南通县植保站(严佑建) |
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| 摘 要： | 草害是造成大豆减产的主要因素之一。本试验通过系统观察大豆田杂草消长规律,对大豆播后不同时期人工除草的保产效果进行了对比试验研究。结果表明:本地大豆田杂草有两个发草高峰,出现时间分别在大豆播后18～30天和37～48天。大豆田杂草防除临界期为大豆播后18～30天,在此期内除草一次,保产效果最佳。
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| 关 键 词： | 大豆田 杂草 竞争临界期 大豆 |
PRIAMRY STUDY ON TIIE CRITAL COMEPTITION INDEX BETWEEN SOYBEAN AND WEED |
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| Zhang Hongjin Zhang Xilin Yan Youjian.PRIAMRY STUDY ON TIIE CRITAL COMEPTITION INDEX BETWEEN SOYBEAN AND WEED[J].Soybean Science,1992,11(3):273-276. |
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| Authors: | Zhang Hongjin Zhang Xilin Yan Youjian |
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| Abstract: | Weed encroachment is one of the main factors that decrease soybean yield. This experimant was conducted to compare the effectiveness of weeding time after soybean sowing for soybean yield protection continual observation on the dynamics of weed growth in soybean fields was undertaken. The result showed that there were two peak periods of weed emergence in soybean fields in Nantong region and the two periods were 18-30 days and 37-48 days after soybean sowing prespectively. The critical period of weed control was 18-30 days after soybean sowied. The highest effectiveness of soybean yield protection was obtained with one weeding on this critical period. |
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| Keywords: | Weeds is soybean and barley fields The distribution The index of critcal com-petition |
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