摘要： 在田间条件下,研究了杂草的发生危害规律及防除关键技术等.初步认为:1.杂草对旱种水稻生长的影响主要表现在降低产量,减少成穗数、结实率、千粒重和穗长|2.杂草累计收获总干重或禾本科杂草干重可作为杂草危害程度的指标|3.禾本科杂草危害较严重,是旱种水稻田的优势草类|4.旱种水稻除草临界期为播种后第25～40天.此外,对杂草发生潜力、除草时期等也进行了讨论.

关键词: 水稻旱种, 杂草危害, 杂草防除

Abstract: Weeds are one of the major limiting factors to the development of dry seeded rice. Therefore, the weed infestation and weed control practices were studied in field experiment. The results are as follows: 1. Weeds damaged the growth of dry seeded rice, especially in reducing yield, the number of panicle, seed setting, 1000-grain weinght and panicle length. 2. The total weed or grasses accumulated dry weight might serve as one of the weed damage indexes. 3. Grasses injured much more seriously than others,which dominated in dry seeded rice field. 4. The critical period of weed control is at 25 to 40 days after sowing. Moreover, the potentiality of weed seeds and weeding time were also discussed.

Key words: Dry seeded rice, Weed infestation, Weed management