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首页> 外文期刊>African Journal of Biotechnology >Seeding method and rate influence on weed suppression in aerobic rice
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Seeding method and rate influence on weed suppression in aerobic rice

机译：播种方法和施肥速率对好氧水稻杂草抑制的影响

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High weed pressure is amongst the major constraints to the extensive adoption of aerobic rice system as a water-wise technique. Towards developing a sustainable weed management strategy, seeding method and rate may substantially contribute to weed suppression and reduce herbicide use and weeding cost. A trough experiment was established at the Plant House of Universiti Putra Malaysia with two seeding methods, namely conventional broadcast seeding (CBS) and line seeding with east-west row orientation (REW). Three seeding rates were established at 200 (SR200), 300 (SR300) and 400 seeds m-2?(SR400); and two weed control levels were established as weedy (W) and weed free (F) in a factorial RCBD with four replications. Twenty?(20)?weed species comprising eleven broadleaved, five grasses and four sedges were identified. Broadleaved weeds contributed more than 50% of the total dry matter. Weed density and dry weight decreased gradually with increased seeding rate, but were independent of methods.?REW produced significantly higher grain yield compared with CBS. Among the seeding rates,SR300 produced?the?highest grain yield followed by SR200 and SR400. Weed free treatment performed better with a yield advantage of 23% over weedy treatment. Weed inflicted relative yield loss did not vary due to seeding methods or rates. Therefore, increasing seeding rate up to 300 seeds m-2?may be worthwhile to reduce weed pressure???without sacrificing rice yield.
机译：高杂草压力是有氧水稻系统作为水技术广泛采用的主要限制之一。为制定可持续的杂草管理策略，播种方法和播种量，可能会大大有助于抑制杂草并减少除草剂的使用和除草成本。通过两种播种方法在马来西亚布特拉大学的植物园建立了一个槽式试验，即常规播种（CBS）和东西向排列的线播种（REW）。确定了三个播种率分别为200（SR200），300（SR300）和400种子m-2？（SR400）;在具有四次复制的阶乘式RCBD中，将两个杂草控制水平确定为杂草（W）和游离杂草（F）。鉴定出20种（20）杂草，包括11种阔叶，5种草和4种莎草。阔叶杂草占总干物质的50％以上。杂草密度和干重随播种量的增加而逐渐降低，但与方法无关。与CBS相比，REW产生的谷物产量高得多。在播种率中，SR300的产量最高，其次是SR200和SR400。与杂草处理相比，无草处理效果更好，产量优势为23％。杂草造成的相对产量损失没有因播种方法或播种量而异。因此，在不牺牲水稻产量的情况下，增加播种量至300种子m-2？可能值得降低杂草压力。

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