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Asian Journal of Plant Sciences
Year: 2007  |  Volume: 6  |  Issue: 6  |  Page No.: 906 - 912

Effects of Rates and Split Application of Compound NPK Fertilizer on the Growth and Yield of Three Amaranthus Species in Nigeria Guinea Savanna

S.O. Alonge, F.O. Alonge, S.P. Bako, J.D. Olarewaju and O.B. Adeniji    

Abstract: Field trials were conducted at two sites in Ahmadu Bello University, Samaru-Zaria, Nigeria, to determine the effect of five rates (0, 125, 2501, 2502 and 500 kg ha-1) of compound fertilizer (NPK 27:13:13) on the growth (root and shoot dry weight) and grain yield of three Amaranthus species. The Amaranthus species include: A. hybridus, A. spinosus and A. hybridus var. cruentus. The plants were sampled weekly between 4 and 7 Weeks After Planting (WAP) and the second dose of the fertilizer (for 125 and 2502 kg ha-1) was applied at 5 WAP. The best growth in the Amaranthus species resulted from 500 kg ha-1 NPK treatment at 4 and 5 WAP and from 2502 kg ha-1 NPK treatment at 6 and 7 WAP. The 2501 kg ha-1 NPK application also produced slightly higher values in growth parameters than 125 kg ha-1 at 4 and 5 WAP, but this situation was reversed at 6 and 7 WAP. The overall data showed that, 2502 kg ha-1 NPK treatment produced higher shoot growth and grain yield than the other treatments. Amaranthus hybridus had the highest shoot growth and total dry weight ha-1 than the other species. Amaranthus hybridus var. cruentus also produced the highest total grain weight per hectare than the other species. This study showed that, the split in contrast to sole application of NPK fertilizer rates can be of greater economic benefit in Amaranthus production.

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