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首页> 外文期刊>Weed Technology >Effect of Glyphosate Application Timing and Row Spacing on Weed Growth in Corn (Zea mays) and Soybean (Glycine max)1
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Effect of Glyphosate Application Timing and Row Spacing on Weed Growth in Corn (Zea mays) and Soybean (Glycine max)1

机译：草甘膦施药时间和行距对玉米（Zea mays）和大豆（Glycine max） 1 杂草生长的影响

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摘要

Corn and soybean were planted in narrow- and wide-row spacings to study the effects of glyphosate application timing and row spacing on light interception and subsequent weed growth. Corn planted in narrow rows (38 cm) had greater light interception than corn planted in wide rows (76 cm) from 35 to 55 d after crop emergence. Soybean planted in narrow rows (both 19 and 38 cm) had greater light interception throughout the growing season than soybean in 76-cm rows. At maximum canopy closure, narrow-row soybean (both 19 and 38 cm) intercepted more light than narrow-row corn. Biomass of weeds emerging after glyphosate application was greater when soybean was planted in 76-cm than in 19- or 38-cm rows. However, weed biomass was generally similar in both row spacings of corn. Sequential glyphosate applications reduced weed biomass in corn each year compared with a single glyphosate application at the 5-cm weed height. Sequential glyphosate applications that followed initial glyphosate application to 10- or 15-cm-tall weeds did not reduce weed biomass compared with a single application.
机译：玉米和大豆分别以窄行和宽行的间距种植，以研究草甘膦施用时机和行距对光拦截和随后杂草生长的影响。在作物出苗后的35到55 d，窄行（38厘米）种植的玉米比宽行（76 cm）种植的玉米具有更大的光拦截能力。在狭窄的行（19 cm和38 cm）中种植的大豆在整个生长季节比在76 cm行中的大豆具有更大的光拦截能力。在最大的树冠闭合处，窄行大豆（19和38 cm）比窄行玉米拦截的光更多。当大豆种植在76 cm的行中时，草甘膦施用后出现的杂草生物量大于19 cm或38 cm时。但是，杂草生物量在两个玉米行距中通常相似。与在5厘米杂草高度单次施用草甘膦相比，连续施用草甘膦每年减少了玉米中的杂草生物量。与单次施用相比，在草甘膦最初施用到10厘米或15厘米高的杂草之后，顺序施用草甘膦不会减少杂草的生物量。

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