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为改进水稻秸秆还田条件下小麦田杂草治理技术,通过田间小区试验研究了不同还田量单独或结合炔草酯施用对后茬小麦田禾本科杂草的控制效果和小麦生长发育及产量的影响。结果表明,随着水稻秸秆单独还田量从1 125 kg/hm2增至4 500 kg/hm2,小麦田杂草发生密度显著下降,4 500 kg/hm2秸秆还田量下小麦分蘖期前杂草发生密度下降60%左右;结合炔草酯施用时,杂草发生密度随秸秆还田量的增加而下降,但不同还田量之间无显著差异,且炔草酯除草活性未受到影响。秸秆还田或炔草酯单独或结合施用均对小麦生长发育无明显的胁迫影响,4500 kg/hm2秸秆单独还田量下,小麦苗期功能叶SPAD值较对照增加7.0%,净光合速率和蒸腾速率分别增加14.9%和12.2%;抽穗期净光合速率、气孔导度、蒸腾速率分别增加28.3%、85.2%和100.0%;千粒重、有效穗数和产量分别增加3.9%、6.7%和16.1%。4 500 kg/hm2秸秆单独还田量对杂草控制效果、小麦生长及产量的影响均与炔草酯推荐剂量单独施用无显著差异,表明该秸秆还田量具有良好的农田生态效应。
In order to improve the technology of weed control in wheat field under the condition of rice straw returning to field, the control effect of weeds with different returning amount alone or in combination with clodinafop-propionate on the weeds in wheat cropping field and the growth and yield of wheat Impact. The results showed that the density of weeds in wheat field decreased significantly with the increase of rice straw alone from 1 125 kg / hm2 to 4 500 kg / hm2, and the weed density of 4 500 kg / hm2 straw before weaning The density of weeds decreased by about 60%. With the application of clodinafop inhibitor, the density of weeds decreased with the increase of straw returning amount, but no significant difference was found between the two treatments. The herbicidal activity of clodinafop homostar was not affected. No significant effect of straw returning or clodinafoprate alone or in combination on wheat growth and development was observed. SPAD value of functional leaves increased by 7.0% at the seedling stage of 4500 kg / hm 2 single straw compared with CK, and net photosynthetic rate Transpiration rate increased by 14.9% and 12.2%, respectively. Net photosynthetic rate, stomatal conductance and transpiration rate at heading stage increased by 28.3%, 85.2% and 100.0%, respectively. Thousand grain weight, panicle number and yield increased by 3.9%, 6.7% and 16.1% . The effect of 4 500 kg / hm2 straw returning alone on the weed control effect, wheat growth and yield was not significantly different from that of clodinafop propargyl alone, indicating that the straw returning amount had a good ecological effect on farmland.