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首页> 外文期刊>Journal of Agronomy and Crop Science/Zeitschrift fur acker-und pflanzenbau >Altitude, temperature, and N Management effects on yield and yield components of contrasting lowland rice cultivars
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Altitude, temperature, and N Management effects on yield and yield components of contrasting lowland rice cultivars

机译：高度，温度和N管理对比较低稻米品种产量和产量组分的管理影响

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摘要

Nitrogen (N) is one of the main nutrients that drive rice grain yield and is intensely managed especially in lowlands under irrigated conditions. A set of experiments was conducted in mid- and high-altitude sites in Rwanda to investigate the response of five genotypes under different sowing dates and different N management. Genotype grain yields were higher and more stable at mid-altitude across sowing dates. N rates strongly affected grain yield at mid-altitude (p < .0001), but not at high altitude. Postponing basal N had positive effects on yield and yield components in both sites, with more pronounced effects at high altitude. Increasing N rate beyond 120 kg/ha led to a decrease in percentage of panicles per tiller and spikelet fertility and a decrease in grain yield due to excessive tillers at both high altitude and mid-altitude. Thus, basal N application should be recommended at high altitude and the increase in N rate up to 120 kg/ha at mid-altitude. A strict observation of recommended planting date should be followed at high altitude, and the use of cold-tolerant genotypes is encouraged.
机译：氮气（n）是促进水稻产量的主要营养素之一，并且在灌溉条件下特别在低地进行强烈管理。在卢旺达中的中高海拔地点进行了一组实验，以研究不同播种日期和不同N管理下的五种基因型的响应。基因型籽粒产率在播种日期的中高度较高，更稳定。 N率在中空中受到强烈影响的谷物产量（P <.0001），但不高海拔。 Postpinging Basal N对两个位点的产量和产量组分进行了积极影响，在高海拔地区具有更明显的效果。增加N率超过120kg / ha导致每分蘖和小穗生育率的百分比减少，并且由于在高海拔高度和中高度的耕作中由于过度分蘖而降低粮食产量。因此，应在高海拔地区建议基础N施用，在中海拔高达120千克/公顷的N比率增加。在高海拔地区应遵循对建议的种植日的严格观察，并鼓励使用冷耐寒基因型。

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