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首页> 外文期刊>Weed technology >Influence of Narrow Row/High Population Corn (Zea mays) on Weed Control and Light Transmittance
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Influence of Narrow Row/High Population Corn (Zea mays) on Weed Control and Light Transmittance

机译：窄行/高种群玉米对杂草控制和透光率的影响

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摘要

Field experiments were conducted from 1989 to 1992 to determine whether no-tillage corn grown in 38-cm rows and a 2x population could improve weed control relative to 76-cm rows and 1x population under reduced-herbicide options. A standard treatment including 1.12 kg ai/ha of atrazine plus 2.24 kg ai/ha of metolachlor was compared with a treatment including the same herbicides applied at 25% of the standard rates. Both treatments included 0.56 kg ai/ha of paraquat which controlled annual weeds established at the time of application. Weed control was less in the 25%-herbicide treatment than in the standard treatment in two of four years when corn was grown in 76-cm rows with a 1x population. The 25%-herbicide treatment provided weed control and grain yields similar to the standard treatment in each year when corn was grown in 38-cm rows with a 2 x population. Weed control was poor and yield was reduced when no herbicides were applied regardless of row spacing or population. The leaf canopy of corn in the 38-cm row/2x-population treatment reduced light transmittance 1 wk earlier than corn in the 76-cm row/1x-population treatment.
机译：从1989年至1992年进行了田间试验，以确定相对于76厘米行和1倍种群在减少除草剂选择下生长在38厘米行和2倍种群的免耕玉米是否可以改善杂草控制。将包括1.12 kg ai / ha的azine去津加2.24 kg ai / ha的异丙甲草胺的标准处理与以25％的标准比例施用相同除草剂的处理进行了比较。两种处理均包括0.56 kg ai / ha的百草枯，可控制施用时建立的一年生杂草。当玉米种植在76厘米，1倍人口的行中时，在25％的除草剂处理中，杂草控制比标准处理少了四年。当玉米生长在38厘米，2倍人口的行中时，采用25％的除草剂处理可提供与标准处理相似的杂草控制和谷物产量。当不施用除草剂时，无论行距或种群如何，杂草控制均很差，且产量降低。在38厘米行/ 2x种群处理中，玉米的叶冠层比76厘米行/ 1x种群处理中的玉米，其透光率降低了1 wk。

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