| 摘要: |
| 研究结果表明,杂草株高、干重指数越大,危害期越长,对小麦产量影响越大,损失越严重。杂草相对株高干重积与危害期对小麦产量及成穗数、穗粒数、千粒重呈极显著负相关;与产量损失率呈极显著“S”型生长曲线正相关,杂草防除经济阈值为株高干重积102. 1mg·m-2(混合密度为15～20株/m2);危害临界期为小麦拔节前。并建立了混生杂草对小麦危害损失关系数学模型。 |
| 关键词: 混生杂草群落，小麦，产量损失测定模型，经济阈值 |
| DOI： |
| 分类号:S451.1 |
| 基金项目: |
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| A Study on the Effect of Weed Colony on Wheat Yield Loss and Its Economic Threshold |
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| Abstract: |
| The research results showed that the height, index and harm period of
weeds could strongly affect the yield of wheat. The greater they were, the more severe
the loss of yield was.The relative weed height, dry weight, and the harm period had a remarkable negative relationship with wheat yield, ears/hm2, grains/ear and weights/1000 grains,while they showed a remarkable positive relationship to the rate of wheat
yield loss.A simulated equation of weeds to wheat yield loss was established in this paper. The economic threshold for weed control was 102. 1 mg·m-2 of the product of
height and dry weight (15-20 plants/m2 weed density). The critical harm period was
justbefore jointing stage. |
| Key words: weed colony,wheat,yield loss determination model,economic threshold |
