|Title:||Studies on competitive ability of rice and barnyardgrass II. Effect of barn-yardgrass density on growth and yield of rice||Other Titles:||水稻與稗草競爭關係之探討(二) 稗草密度對水稻生育之影響||Authors:||Chwen-Ming Yang
|Keywords:||Rice;Barnyardgrass;Competition;Interference;Growth;Yield;水稻;稗草;競爭關係;干擾;生長;產量||Issue Date:||23-May-1995||Publisher:||中華農藝學會||Journal Volume:||5||Journal Issue:||4||Start page/Pages:||375-381||Source:||中華農藝||Abstract:||
Experiments were conducted in the experimental farm of Taiwan Agricultural Research Institute to study growth and yield response of rice (Oryza sativa L. cv. Tainung No.67) to barnyardgrass [Echfnochloa crus-galli (L.) Beauv.] density. Barnyardgrass was planted interlined to rice 1.5 to 13.0 plants per meter of row in the second crop of 1993 and 0.5 to 11.0 plants per meter of row in the first crop of 1994. It was shown that growth characters of rice measured at 50% of heading were affected by barnyardgrass density in the first crop but not in the second crop. Tiller and leaf numbers and leaf area were decreased in rice grown in more than 3 plants per meter row of barnyardgrass. Season-long interference of barnyardgrass at the maximum density reduced rice yield by 50 and 64% for the second and the first crops, respectively. Among yield components, the percent filled grain was decreased significantly in both crops, dropping from 66.91 to 53.87% in the second crop and from 82.85 to 73.06% in the first crop at 7 plants per meter of row of barnyardgrass. For the first crop of 1994, tiller number, grain number per plant and 1000-grain weight were also decreased at this density.
本文研究旨在探討水田中稗草族群密度對水稻生長及產量之影響田間試驗係於臺灣省農業試驗所農場進行，包括1993年二期作及1994年一作。稗草植株植於水稻行間，密度分別為每公尺1.5〜13.0株（二期作）及0.5～11.0（一期作）。依水稻50%抽穗期取樣结果，稗草族群密度而低不顯著影響二補水稻調查生長性狀，但可明顯改變一期作水稻生長表現；當稗草密度達每公尺3株以上時，水稻之分糵數、葉片數、及葉面積均減少，致使稻株地上部植株生質量降低。收穫時發現，稗草每公尺7株全期干擾時，二期作顯著減產35%，—期作則減產48%，在最大稗草密度兢爭狀況，一、二期作分別減產64及50%。產量構成要素中以稔實率受稗草密度影響最大，在高稗草密度（7株/公尺）分別由66.91%降至53.87% (二期作）及82.85%降至73.06% (—期作）。另一期作之分糵數、每株充實粒數及千粒重也在此高密度下顯著減少。
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