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首页> 外文期刊>Indian Journal of Weed Science >Effect of nitrogen and plant population levels on competition of maize (Zea mays L.) with weeds
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Effect of nitrogen and plant population levels on competition of maize (Zea mays L.) with weeds

机译：氮素和植物种群水平对杂草对玉米（Zea mays L.）竞争的影响

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摘要

Field experiments were conducted at the experimental area of Punjab Agricultural University, Ludhiana during kharif seasons of 2000 and 2001 in order to study the competitive ability of maize with weeds as influenced by nitrogen levels and plant densities on loamy sand soils. Higher plant population of 90000 plants ha~(-1) significantly reduced dry matter accumulation by weeds during 2000 as compared to the recommended plant density (75,000 plants ha~(-1)) but these differences were non-significantduring 2001. Higher level of nitrogen (175 kg ha~(-1)) resulted in significant increase in grain yield than the recommended dose i.e. 125 kg ha~(-1), whereas higher plant population (90,000 ha~(-1)) resulted in significant reduction in grain yield than75,000 plants per hectare during both the years. On an average of two years, pre-emergence application of atrazine at 1 kg ha~(-1), atrazine 0.75 kg ha~(-1)+straw mulch and two hand weeding treatments increased grain yield by 39.4, 38.2 and 36 percent than unweeded control.
机译：为了研究玉米和杂草在氮肥水平和植物密度影响下对壤土质沙土的竞争能力，于2000年和2001年的哈里夫季期间在卢迪亚纳旁遮普农业大学的实验区进行了田间试验。与建议的植物密度（75,000株ha〜（-1））相比，2000年期间90,000株ha〜（-1）较高的植物种群显着减少了杂草的干物质积累，但这些差异在2001年期间不显着。氮（175 kg ha〜（-1））导致谷物产量显着高于推荐剂量，即125 kg ha〜（-1），而较高的植物种群（90,000 ha〜（-1））导致谷物产量显着降低。两年间，谷物产量均超过每公顷75,000株植物。平均两年，出芽前施用阿特拉津1 kg ha〜（-1），阿特拉津0.75 kg ha〜（-1）+秸秆覆盖和两只手除草处理可使谷粒增产39.4％，38.2％和36％比不除草控制。

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