【摘要】 通过盆栽试验,探讨了2,4-D丁酯土壤封闭处理对黑龙江3个大豆主栽品种东农52、合丰55、黑河48的出苗、株高、茎粗、鲜重、叶长和叶宽的影响。结果表明:(1)2,4-D丁酯施药量540 a.i.g·hm-2,3个品种大豆真叶叶长、叶宽小于对照,且黑河48的植株鲜重降低;对3个品种大豆其他指标及东农52、合丰55鲜重无影响。仅以鲜重为判定指标,黑河48较其他两个品种大豆更敏感;(2)2,4-D丁酯施药量1080 a.i.g·hm-2,3个供试品种大豆出苗率正常,但茎基部畸形膨大,株高、鲜重以及真叶叶长、叶宽生长均受抑制。敏感品种黑河48大豆受害最重,最终减产;(3)2,4-D丁酯施药量达到或超过1620 a.i.g·hm-2,3个品种大豆出苗率过低。东农52、黑河48大豆均减产;(4)施药量2160 a.i.g·hm-2,供试3个品种大豆出苗率过低,且叶长、叶宽生长受抑制时间过长,最终3个品种大豆均减产。更多还原

【Abstract】 Effect of 2,4- Dbutylate treatment of soil on emergence rate, plant height, stem diameter, freshweight, leaf length and width of three main cultivars in Heilongjiang Province, Dongnong 52, Hefeng 55 and Heihe48, was studied in the paper by pot-cultured experiment. The results indicated that when the application rate was540 g/hm2, only leaf length and width of true leaf of these three soybean cultivars and fresh weights of Heihe 48 re-duced. If we take the fresh weight as the only evaluating indicator, Heihe 48 was more sensitive than the other twocultivars; When the application rate was 1080 g/hm2,emergence rates were normal, but stem bases expanded andplant heights, fresh weights and leaf lengths and widths all reduced. Yield of the most sensitive cultivar Heihe 48 de-creased. When the application rate reached or exceeded 1620 g/hm2, emergence rates of three soybean cultivars re-duced significantly. Yield of Dongnong 52 and Heihe 48 reduced. When the application rate reached 2160 g/hm2,emergence rates of three soybean cultivars were too low, and leaf lengths and widths were inhibited for too long, thusyield of all three cultivars reduced.更多还原