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首页> 外文期刊>Middle Eastern and Russian Journal of Plant Science and Biotechnology >Effect of Different Levels of Nitrogen Fertilizer and Cultivars on Growth, Yield and Yield Components of Romaine Lettuce (Lactuca sativa L.)
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Effect of Different Levels of Nitrogen Fertilizer and Cultivars on Growth, Yield and Yield Components of Romaine Lettuce (Lactuca sativa L.)

机译：不同水平的氮肥和品种对长叶莴苣（Lactuca sativa L.）生长，产量和产量构成的影响

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摘要

In order to determine the effect of nitrogen fertilizer rates and cultivars on growth and critical yield of lettuce, an experiment was conducted at Shahid Chamran University of Ahwaz, Iran during 2005-2006. This study was arranged in a spilt plot experiment based on a randomized complete block design, in three replications. The treatments included four nitrogen rates (0, 60, 120, and 180 kg N ha~(-1)) as the main plot and two lettuce cultivars ('Pich Ahwazi' and 'Pich Varamini') as the sub-plot. Sampling was done in 86, 100, 114, 126, 142, and 156 days after sowing. The criteria measured were plant length, fresh and dry weights of leaves, leaf area, number of leaves, crop growth rate (CGR), leaf area index (LAI) and yield. Results indicated that different levels of nitrogen fertilizer on all growth characteristics were significant at P<0.01. Nitrogen fertilizer caused head formation to accelerate and delayed the bolting date of lettuce. Cultivar had a significant effect on growth characteristics, on fresh and dry weights of leaves and on leaf number but not on plant length and leaf area. The highest yield was obtained with 120 kg ha~(-1) treatment by 'Pich Ahwazi'. Also, it took 'Pich Varamini' longer to form a head and to flower than 'Pich Ahwazi'.
机译：为了确定氮肥用量和品种对生菜生长和临界产量的影响，2005-2006年在伊朗阿瓦兹的Shahid Chamran大学进行了一项实验。这项研究被安排在一个基于随机完整块设计的溢漏图实验中，一式三份。处理包括以四个氮肥（0、60、120和180 kg N ha〜（-1））为主要小区，以两个生菜品种（“ Pich Ahwazi”和“ Pich Varamini”）作为子小区。播种后第86、100、114、126、142和156天进行采样。所测量的标准是植物长度，叶片的新鲜和干燥重量，叶片面积，叶片数量，作物生长速率（CGR），叶片面积指数（LAI）和产量。结果表明，不同水平的氮肥对所有生长特性的影响均显着于P <0.01。氮肥导致黑头形成加快并延迟了生菜的抽date期。品种对生长特性，叶片的新鲜和干燥重量以及叶片数量有显着影响，但对植物长度和叶片面积没有显着影响。通过“ Pich Ahwazi”处理120 kg ha〜（-1）可获得最高产量。同样，比起“ Pich Ahwazi”，“ Pich Varamini”花更长的时间才能形成头并开花。

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