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首页> 外文期刊>Bulletin of the National Research Centre >Weed Competition in the Field of Direct Seeded Rice
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Weed Competition in the Field of Direct Seeded Rice

机译：直播水稻领域的杂草竞争

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摘要

Two field experiments were carried out during summer seaon of 1998 and 1999 at Sharbas Village, Domietta Goveraorate, Egypt, to study the effect of the time removal of weeds on yield in direct seeded rice. Ecliinochloa crus-galli, Echinochoa colonum, Cypcrus difformis and Aania attenuate were the major weed species. Competition beyond 20 days after sowing caused drastic reduction in the number of panicles/m2 and grain yield. Grain yield of rice increased significantly with the increase in the duration of weed-free period. Density of weeds emerging between 20 and 40 days after sowing was high and could compete with the crop resulting in reduced grain yield. Hand weeding at three times (20 , 40 and 60 days) after sowing gave results equal to the hand weeding up to harvest (4.437 and 4.532 ton/feddan). While, hand weeding at two times (20 and 40 days) gave the second rank (4. 437 ton / feddan). The period during 20 to 60 days after sowing was found to be an important factor in crp/weed competition.
机译：1998年和1999年夏季，在埃及Domietta Goveraorate的Sharbas村进行了两个田间试验，以研究除草时间对直播稻米产量的影响。杂草主要有杂草（Ecliinochloa crus-galli），大肠棘草（Echinochoa Colonum），艰难丝草（Cypcrus difformis）和淡化A / nania。播种后20天以上的竞争导致每平方米穗数和籽粒产量大大降低。随着无草期的延长，水稻的籽粒产量显着增加。播种后20至40天出现的杂草密度很高，可能与作物竞争，导致谷物减产。播种后三遍（20、40和60天）进行人工除草，其结果与收获前的人工除草（4.437和4.532吨/前馈）相等。而两次除草（20天和40天）则排在第二位（4. 437吨/联邦调查）。发现播种后20至60天的时间段是crp /杂草竞争的重要因素。

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