A study was conducted on a research station at Kobo sub-center of Sirinka Agricultural research Center for two years to determine the optimum rates of N and P fertilizers for green maize production under irrigation in Kobo-Girana irrigation valley. Four levels of N (0, 46, 92 and 138 kg N ha -1 ) with three levels of P fertilizer (0, 23 and 46 kg P 2 O 5 ha -1 ) were factorially combined and laid in RCBD design with three replications. A uniform irrigation water depth and interval was applied to all plots based on maize’s irrigation water requirement determined for the area. The crop was irrigated a total amount of 500 mm irrigation water at 7 days interval starting from the development stage. Phosphorus fertilizer was applied all at planting. While, N fertilizer was applied in split, 1/3 at planting, 1/3 at knee height and 1/3 at tasseling stage. The result shows that there was no significant (p0.05) interaction of N and P fertilizers on the cob yield, cob number, cob length and cob diameter of green maize. However, the main effect of N fertilizer had significant (p 0.05) effect on the cob yield of green maize, which is attributable to the medium to high levels of Olsen’s extractable available P in bottom valleys of alluvial soils of Kobo where the study site laid. The highest cob number (51556) and cob weight (12.0 t ha -1 ) was recorded from application of 138 kg N ha -1 followed with statistically insignificant (p0.05) difference by the cob number (49020) and cob weight (11.1 t ha -1 ) obtained from application of 92 kg N ha -1 . The partial budget and the sensitivity analysis result considering 15% possible price fluctuation show that the highest marginal rate return of 421.7% was obtained from application of 92 kg N ha -1 . While, the lowest marginal rate return of 378.8% was recorded from application 138 kg N ha -1 . Therefore, application of 92 kg N ha -1 is recommended for maximum and economic return of green maize production under irrigation in Kobo valley.
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机译：一项研究是在西里克纳农业研究中心Kobo子中心的研究站进行了两年的研究，确定Kobo-Girana灌溉谷的灌溉下的绿色玉米生产的N和P化肥的最佳速率。具有三个水平的P肥（0,23和46 kg P 2 O 5 HA -1）的四个水平的N（0,46,92和138 kg Na -1）被视为组合并铺设在RCBD设计中，具有三种复制。基于针对该地区确定的玉米灌溉需求的所有地块应用均匀的灌溉水深和间隔。从开发阶段开始，在7天间隔内灌溉裁剪的总量为500毫米灌溉水。磷肥均以种植施用。虽然，N肥料在植物高度为1/3，膝关节高度1/3和旋转阶段的1/3施用。结果表明，N和P肥料对绿色玉米的COB产量，COB数，COB长度和COB直径没有显着（p> 0.05）相互作用。然而，N肥的主要作用对绿色玉米的COB产量有显着（p 0.05）的影响，该玉米玉米棒产率归因于研究现场奠定的大谷底谷底谷中的蛋白质可萃取的可用P. 。从施用138kg n ha -1的施用中记录了最高的COB数（51556）和COB重量（12.0 t HA -1），然后用COB数（49020）和COB重量差异（p> 0.05）差异（11.1 T ha -1）从施用92kg n ha -1获得。考虑到15％可能的价格波动的部分预算和敏感性分析结果表明，从施用92kg n ha -1，获得了421.7％的最高边际率返回。虽然，从申请138 kg n ha -1记录了378.8％的最低边际率返回。因此，建议在Kobo Valley灌溉下的绿玉玉米生产的最大和经济回报的应用。
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