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首页> 外文期刊>Indian Journal of Weed Science >Crop-Weed Competition and Determination of Critical Period in Onion (Allium cepa) under North-West Plain Zone
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Crop-Weed Competition and Determination of Critical Period in Onion (Allium cepa) under North-West Plain Zone

机译：西北平原带区洋葱杂草竞争与关键时期的确定

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Significantly higher bulb yield was obtained when crop was kept weed-free for initial 60 days after transplanting (DAT) compared to 20 and 40 DAT where weeds remerged at later stages and accumulated higher weed dry matter and reduced the bulb yield. Bulb yield remained at par with weed-free check when weeds were allowed to grow with the onion crop upto 20 DAT; however, weedy period beyond 20 days was detrimental to bulb yield. There was 53.4% reduction in bulb yield under season long unweeded conditions. Critical period of crop-weed competition was found to be 20-60 DAT. Early infestation of weeds in onion is one of the major constraints limiting the establishment of the crop and thereafter its production. Weed pressure can be especially damaging toyoung onion plants because they are slow growing, have shallow roots and do not have enough foliage to adequately shade the ground. Bulb size .and bulb yield are reduced under weedy conditions and yield reduction of 40-80% was reported in weed-infestedfield of onion (Mondal, 1997; Kolhe, 2001). The yield losses may be minimized effectively by keeping the fields weed-free during the critical period of weed-crop competition. Removing the weeds throughout the growing season may not be economical. Information on critical period of crop-weed competition is essential to optimize the herbicide use or integration of alternative weed control measures such as stage of mechanical weeding. Therefore, an experiment was conducted to determine the critical period of crop-weed competition in onion bulb to render weed management more effective and economical.
机译：当作物在移植后最初的60天保持无杂草（DAT）时，获得的鳞茎产量明显更高，相比之下，杂草在后期阶段再生并积累了较高的杂草干物质并降低了鳞茎产量的20和40 DAT则可以达到。当允许杂草随洋葱作物生长至20 DAT时，鳞茎的产量与无杂草检查保持一致。然而，超过20天的杂草期对鳞茎产量有害。在长期无杂草的条件下，鳞茎产量降低了53.4％。作物杂草竞争的关键时期被发现为20-60 DAT。洋葱中杂草的早期侵染是限制农作物定植及其后产量的主要制约因素之一。杂草压力可能会特别损害年轻的洋葱植物，因为它们生长缓慢，根系浅且没有足够的叶子来充分遮蔽地面。在杂草条件下，鳞茎大小和鳞茎产量降低，据报道，在杂草洋葱田中鳞茎产量降低了40-80％（Mondal，1997; Kolhe，2001）。通过在杂草作物竞争的关键时期保持田间无杂草，可以有效地使产量损失最小化。在整个生长季节清除杂草可能不经济。有关作物杂草竞争关键时期的信息对于优化除草剂的使用或替代杂草控制措施（例如机械除草的阶段）的整合至关重要。因此，进行了一项实验来确定洋葱鳞茎中作物杂草竞争的关键时期，以使杂草管理更加有效和经济。

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