Field experiment was carried out at the Teaching and Research Farm of Kwara State University, Malete, Ilorin, to evaluate the effect of compost, organomineral, and inorganic fertilizers on the growth and yield of Amaranthus caudatus as well as its residual effects. Amaranthus was grown with compost Grade B (unamended compost), organomineral fertilizer Grade A (compost amended with mineral fertilizer), and NPK 15-15-15 and no fertilizer (control). All the treatments except control were applied at the rate of 100？kg？N/ha. The results indicated that the Amaranthus yield of 18.9？t/ha produced from Grade A was significantly () higher than 17.6？t/ha obtained from NPK fertilizer. Residual effect of Amaranthus growth parameters such as plant height, number of leaves, and yield values obtained from Grade A was also significantly () higher than that of NPK, compost, and control values. Thus, organomineral fertilizer could be used in cultivation of Amaranthus caudatus in Ilorin and in similar type of soil in similar agroecology. 1. Introduction Vegetable production in Africa is as old as peasant farming though its cultivation is still at the household level with very few farmers producing on a commercial level. This could be due to the fact that crops such as cereals, roots, and tubers and body-building crops like legumes are given much attention. Cereals and tubers form the bulk of food consumed in the tropics but they are deficient in minerals and vitamins compared to the body requirement to guarantee good healthy living [1]. Amaranths species is a leafy vegetable in the tropical region of world. It forms a high percentage of the daily intake of leafy vegetables [2]. Amaranthus caudatus is grown for its leaves and is among the highly prized leaf vegetables in Nigeria, due to their high nutritional and commercial significance. There is an increasing awareness of value of leafy vegetable in contributing to balanced diet, particularly in area where animal protein is deficient. Leafy vegetables contribute significantly to the amount of carotene, vitamin c, protein, and minerals particularly calcium [3]. To grow vegetable amaranth it is necessary to know the effect of sources of nitrogen fertilization on its yield because nitrogen was found to be the primary limiting factors of Amaranths production [4]. Most Nigerian soils have low nitrogen and the low nitrogen status is usually supplemented with N fertilizer, and the importance of this source has increased over the year. However, the problem with the usage of chemical fertilizer is that while it can lead to high
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