Abstract: Different combinations of herbicide 20% propanil and 56% mcpa Na were used to upland rice for post emergence treatment in 1996-1998. Results showed that 20% propanil 7.5-11.5 kg/hm² combining with 56% mcpa Na 0.25-0.75 kg/hm² and sprayed with water 750-900 kg/hm² on stems and leaves at 2-6 leaves seedling stage could get satisfying effects, the rice plant grew strongly and had resistance to lodging. Within safety and valid range, the combinations had no adverse effect on plant height, tiller number, panicle length, and grains number per panicle.

Key words: upland rice, herbicide, weed control, spraying

摘要： 1996～1998年采用不同量的20%敌稗乳油和56%二甲四氯钠盐粉剂混合喷施防除旱稻田中已出苗的杂草。通过分析不同处理杂草防除率、产量及影响产量指标，得出对旱稻田苗后杂草经济、安全、有效的用药范围，即20%敌稗乳油7.5～11.5 kg/hm2，与56%二甲四氯钠盐粉剂0.25～0.75 kg/hm2混合，对水750～900 kg/hm2，在稻苗2～6叶期进行茎叶喷施。它可以达到或超过人工除草效果，对稻株安全，并对稻株有增粗、抗倒伏作用。在安全用药量的范围内，不同用药量对旱稻株高、分蘖数、穗长、穗粒数影响不显著。

关键词: 旱稻, 除草剂, 杂草控制, 喷药