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首页> 外文期刊>Acta Universitatis Sapientiae: Agriculture and Environment >Evaluating the effect of plant population densities and nitrogen application on the leaf area index of maize in a reclaimed wetland in Kenya
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Evaluating the effect of plant population densities and nitrogen application on the leaf area index of maize in a reclaimed wetland in Kenya

机译：评价肯尼亚垦区湿地植物种群密度和施氮量对玉米叶面积指数的影响

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Maize is the main staple food in Kenya with over 90% of Kenyans relying on it. While the annual national consumption is increasing, the production of this crop has been on the decline in the last two decades. Maize production in Kenya fell by 33.4% in 2013 with Nyeri among the counties said to be grappling with the production of this crop. Land pressure is one of the major causes of decreased availability of food as well as soil depletion and encroachment upon fragile ecosystems such as wetlands. Nitrogen is a key nutrient in the production of maize, and its deficiency is a major factor limiting its production. This study investigated the effect of N application at 120 kg N/ha and maize density on the Leaf Area Index in reclaimed wetland soils in an experimental set-up comprising a randomized complete block design with three replications. The research was carried out in Nyeri County, Kenya. Leaf Area Index (LAI) was determined using the given SunScan formula. Measurements were done continuously until crop physiological maturity. Results indicated that the leaf area index increased with nitrogen application and reduced with spacing for most treatments. There were no significant differences between the two methods (Copy Method and SunScan). Leaf Area Index (LAI) was high in treatments containing nitrogen and high plant density. It was concluded that high plant density gives high LAI. 50 cm * 12.5 cm (-N) and 50 cm * 12.5 cm (+N) are the recommended plant densities for the site.
机译：玉米是肯尼亚的主要主食，超过90％的肯尼亚人依靠玉米。尽管全国年度消费量在增加，但过去二十年来该作物的产量一直在下降。肯尼亚的玉米产量在2013年下降了33.4％，其中据说奈里（Nyeri）的几个县都在努力种植这种作物。土地压力是导致粮食供应减少，土壤枯竭和对湿地等脆弱生态系统的侵害的主要原因之一。氮是玉米生产中的关键营养素，氮的缺乏是限制玉米生产的主要因素。这项研究在一个实验装置中研究了120 kg N / ha的施氮量和玉米密度对开垦湿地土壤中叶面积指数的影响，该装置包括一个随机的，完整的块设计和三个重复。该研究在肯尼亚的涅里县进行。使用给定的SunScan公式确定叶面积指数（LAI）。连续进行测量直到作物生理成熟。结果表明，在大多数处理中，叶面积指数随施氮量的增加而增加，随间距的增加而减小。两种方法（复制方法和SunScan）之间没有显着差异。在含氮和高植物密度的处理中，叶面积指数（LAI）高。结论是高植物密度产生高LAI。建议的现场植物密度为50厘米* 12.5厘米（-N）和50厘米* 12.5厘米（+ N）。

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