【摘要】 以绵阳26为供试材料,采用烯效唑干拌种研究了不同浓度(0、10、20、40 mg/kg)对不同播种密度(90×10~4、180×10~4、270×10~4/hm~2)下小麦分蘖成穗的影响。结果表明,烯效唑处理后,公蘖前期(出苗50d内)烯效唑浓度越高,达到最大分蘖速度的时间越早,低节位分蘖特别是第1、第2分蘖的发生加快;分蘖后期(出苗50 d后)分蘖速度减慢,高浓度处理(40 mg/kg)的分蘖发生比低浓度提早10 d结束。烯效唑提高了孕穗后期单位面积的茎蘖数、分蘖成穗率、单株穗数和单位面积有效穗,其中以20 mg/kg最优。密度不同,烯效唑提高分蘖成穗率的效果有差异,以高密度下的效果更佳。更多还原

【Abstract】 Effects of uniconazole waterless-dressing seeds treatments on tiller-earring of wheat variety Mianyang 26 under different seedling densities(90×104、180×104、270×104/hm2)were studied. The results showed that during the early tillering stage (within 50 days after emergence) , the higher concentration of uniconazoleis, the earlier the highest tillering speed reach. It was especially true to the first and second tillers. During the late tillering stage (50 days after emergence), the tillering speed of the treated plants decreased and tillering emergence of lower concentration treatments come over later 10 days than that of higher concentration treatment (B3). The results indicated that uniconazole treatments increased the percentage of tiller emergence, earring-tiller and the number of stem-tiller per unit area. It also showed that 20 mg/kg was the best among all treatments. The effects of uniconazole treatments varied under different seedling densities, i. e. , the higher was better.更多还原