|Title:||Studies on Competitive Ability of Rice and Barnyardgrass I.Suppresing Effect of Rice on Barnyardgrass||Other Titles:||水稻與稗草競爭關系之探討 (一)水稻對稗草之壓制效應||Authors:||楊純明
|Keywords:||Rice;Barnyardgrass;competition;suppressing effect;growth;productivity;水稻;稗草;競爭關係;壓制效應;生長;生產力||Issue Date:||1-Jun-1995||Publisher:||中華民國雜草學會||Journal Volume:||16||Journal Issue:||1||Start page/Pages:||56-62||Source:||中華民國雜草學會會刊||Abstract:||
Field experiments were conducted in the experimental farm of Taiwan Agricultural Research Institute to study the suppressing effect of rice (Oryza sativa L. cv.Tainung NO.67) on growth and productivity of barnyardgrass [Echinochloa crus-galli (L.) Beativ.] plants of Barnyardgrass were grown interlined to rice with the same plant distance and in the ratio of 1:1,and with pure stands as checks in the second crop of 1993 and the first crop of 1994. It was shown that generally growth of barnyardgrass was suppressed by rice when grown together in the paddy field. Rice exerted a strong suppressing effect from the early growth stage for the second crop while such effect became significant in the later growth stage for the first crop. Dry weights of leaves, sheaths (with stems) and panicles (with caryopses) were decreased by the competition of rice during growing period. At harvest, the suppression of panicle weight of barnyardgrass was significant only in the first crop. Productivity of sheaths was higher than of leaves in barnyardgrass without the competition of rice as indicated in the decreasing leaf sheath weight ratio. The proportion of sheaths to leaves increased greatly from 30 days after transplanting. When competed with rice in the second crop, barnyardgrass built up their leaves significantly in the early growth stage. Barnyardgrass was tended to produce more caryopses in competition with rice, especially in the second crop. Without rice competition, the reproduction capability was prevailing in the first crop.
|Appears in Collections:||作物組|
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.