Abstract: Grain amaranth is an important leaf and seed vegetable crop in Nigeria. There is scanty information on its nutrient requirements for optimum yield and quality. Field experiments were conducted at Ladoke Akintola University of Technology Teaching and Research farm, Ogbomoso in the cropping seasons of 2004 and 2005 to determine the effect of nitrogen fertilizer on the growth, yield, quality and chemical composition of grain amaranth varieties. The investigated treatments were two varieties of grain amaranth; NH 84/593-1 and 1 NH 84/594 subjected into five levels of nitrogen fertilizer viz: 0, 15, 30, 45 and 60 kg N ha. These were assigned randomly into three replicates and fitted into factorial experiment in a randomized complete block design. Data collected on the growth parameters, yield and quality attributes were analyzed using ANOVA. The plant height, number of leaves, dry matter yield of the leaves and stem of the grain amaranth increased significantly (P = 0.05) 1 1 as the applied N rates was increased from 0 kg ha up to 60 kg ha of N. The grain yield and quality of the 1 grain amaranth varieties were increased from 0 up to 45 kg N ha and declined thereafter. The combined nitrogen and varietal effects were significant for the grain yield in both years. The highest grain yield was recorded for NH 84/593-1 while NH 84/594 gave the least values with and without N application. Although, all the plant parts are very rich in protein, fat, carbohydrate and other nutrient elements, the leaves recorded the highest contents followed by the grain and the stem. Therefore, the optimum N rate for the maximum yield and 1 quality of grain amaranth is 45 kg N ha and NH 84/593-1 is adjudged as the best variety for the southwester
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