نوع مقاله : مقاله پژوهشی
1 گروه تولید و ژنتیک گیاهی دانشکده علوم کشاورزی دانشگاه گیلان
2 دانشکده علوم کشاورزی دانشگاه گیلان، رشت
3 میدان گیل_جنب بیمارستان رسول اکرم_کوی سازمانی موسسه تحقیقات برنج ر
4 گروه زراعت و اصلاح نباتات دانشکده علوم کشاورزی، دانشگاه گیلان- رشت، ایران
عنوان مقاله [English]
In order to investigate the role of inter-species interference and competitive outcome of barnyard grass (Echinochloa crus-galli) and bulrush (Bolboschoenus planiculmis) weeds with Guilaneh cultivar of rice, a factorial experiment with two factor including weed species (barnyard grass and bulrush) and rice: weed ratios in each pot (0: 4, 1: 3, 2: 2, 3: 1 and 4: 0) was conducted as a randomized complete-block design with three replications. The results showed that, except for height, all other traits of rice decreased more in competition with barnyard grass than competition with bulrush. The percentage of these reductions averaged over planting ratios, respectively on pot- and single plant level were 10 and 21% for biological yield, 12 and 23% for seed yield, 10 and 21% for number of panicle, 13 and 25% for number of filled seeds, 7 and 16 for total number of seeds and 10 and 17% for number of tillers more due to rice competition with barnyard grass than bulrush. These results, along with the replacement series diagrams studies have indicated the sever competition of barnyard grass with rice plants. However, no significant difference in the competitive effect of the two weed species, as well as the insignificant dominance index and the ratio of barnyard grass and bulrush competition, indicates the importance of bulrush as a new weed in rice fields. Therefore effective management of bulrush in addition to barnyard grass should be taken into consideration in the development of the weed management programs in paddy rice fields.