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首页> 外文期刊>Australian Journal of Crop Science >Effect of different nitrogen sources and time of application on corn grain yield
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Effect of different nitrogen sources and time of application on corn grain yield

机译：不同氮源和施用时间对玉米籽粒产量的影响

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Alternatives to reduce N losses in soil and increasing nutrient utilization efficiency are important because of the complex dynamicsof nitrogen in the soil. In this context, the objective of this study was to evaluate the mechanized application of N doses, atdifferent times (sowing or top-dressing) and forms (surface or incorporated) using urea to evaluate N leaf concentration,production components and corn grain yield. The study was conducted in Selvíria - MS, Brazil, in an Oxisol with clay texture inBrazilian Cerrado. The experimental design was a randomized complete block design with four replicates, arranged in a 6 x 2 x 2factorial scheme: 6 doses of N (0, 50, 100, 150, 200, 250 kg ha -1 ), 2 application times (fully sowing or top-dressing) and 2 applicationforms in the soil (surface and incorporated). The evaluations were: N leaf concentration, stem diameter, plant height, height of pininsertion, spike length and diameter, number of rows per spike, grains per row, and grains per spike, 100 grains mass and corn grainyield. The N application in surface would be more beneficial due to the greater operational capacity. We recommended theapplication of 153 kg ha -1 of N in the soil without incorporation at sowing or top-dressing time in a clayey texture soil and withadditional irrigation.
机译：由于土壤中氮的复杂变化，减少土壤中氮损失和提高养分利用效率的替代方法很重要。在这种情况下，本研究的目的是评估尿素在不同时间（播种或追肥）和形态（表面或掺入）的N剂量的机械施用，以评估N叶片的浓度，生产成分和玉米籽粒的产量。这项研究是在巴西塞维利亚（Selvíria）的巴西塞拉多（Cerrado）的粘土质地的Oxisol中进行的。实验设计是一个随机的完整模块设计，具有四个重复，以6 x 2 x 2因子方案布置：6剂量的N（0、50、100、150、200、250 kg ha -1），2次施用（完全播种或追肥）和2种在土壤中的应用形式（表面和结合）。评估为：N叶片浓度，茎粗，植株高度，插针高度，穗长和直径，每个穗的行数，每行的谷物和每个穗的谷物，100粒质量和玉米籽粒产量。由于更大的操作能力，在地面上施用N会更加有益。我们建议在土壤中施用153 kg ha -1的氮，但不要在播种或追肥时将其掺入粘土质地的土壤中，并且需要额外灌溉。

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