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Field experiment was conducted under irrigation at Bayero University Kano, during 2011/2012 dry season to investigate the effects of different nitrogen levels and harvest interval on growth and leaf yield of Moringa  ( Moringa oleifera (Lam )). The treatments consisted of four levels of nitrogen (0, 50, 100 and 150kg N ha -1 ) and three times of harvest interval (2, 3, and 4 weeks). These were arranged in a split plot design with the nitrogen levels allocated to the main plots while the harvest interval allocated to the sub plots and replicated four times. The data collected were subjected to analysis of variance (ANOVA) using the general linear model of GenStat and significant different means were separated using DMRT. The result shows that applications of nitrogen significantly increased plant height, number of leaflets per plant, plant stem diameter, number of  branches per plant, fresh and dry weights per plant. Generally, 150kg N ha -1 level gave highest values for all  the growth and yield characters assessed. The highest fresh and dry total leaf yields were also obtained with  150kg N ha -1 level. Increase in harvest interval significantly increased fresh and dry leaf yields of Moringa with  the highest yields obtained from 4 weeks harvest interval. Nitrogen and harvest interval interaction was found  to be significant on fresh and dry leaf yields of Moringa , which indicated that high yields were supported by  150kg N ha -1 at 4 weeks harvest interval. Keywords : Moringa , harvest interval, Nitrogen level, yield

bayero journal of pure and applied sciences

Effects of nitrogen levels and harvest interval on the growth and yield of &lt;i&gt;Moringa (Moringa Oleifera Lam)&lt;/i&gt; in Sudan Savanna of Nigeria