Greenhouse and Field experiments were conducted at the Institute for Agricultural Research and Samaru College of Agriculture, Ahmadu Bello University, Zaria. The objectives of the experiments were to evaluate the combine effects of cow dung subjected to different management practices and Urea fertilizer on some Maize growth parameters and to observe the residual effects of the cow dung in the second year. The experiment was a factorial experiment, 3 management practices, 4 duration of storage, and 2 nitrogen levels, laid out in a Randomized complete block design and replicated three times. The Greenhouse study revealed that, combining cow dung subjected to different management practices (pit covered May and surface heaped uncovered June) and Urea at 45 kg N ha -1 gave significantly (P < 0.05) higher dry matter yield and surface heaped covered April treatment gave taller plants, which were statistically at par with NPK treatment (120 kg N ha -1 ). The results of the field studies for the two years were consistent on the dry matter yield and plant height. The field studies showed that, the direct effect, N amended surface heaped covered April gave the highest Maize Stover yield for the two seasons, while on the residual effect, N amended, the surface heaped uncovered March treatments gave the highest stove yields. On plant height, the direct effect N amended surface heaped uncovered May treatments gave significantly taller plants than all other treatments in the two seasons. While on the residual effect, the surface heaped covered April treatment was the one that gave taller plants in the two seasons.
This study consisted of collection and incubation of cow dung, followed by evaluation of the incubated cow dung in field experiments in years 2003 to 2004 at the Institute of Agricultural Research, Ahmadu Bello University and Samaru College of Agriculture farms, all located in Samaru, Zaria. The objectives of this study are to determine the effects of subjecting cow dung to different management practices and nitrogen fertilizer on maize grain yield. The study was a factorial experiment, with 3 cow dung management practices, 4 storage durations in the field and 2 levels of nitrogen. There was a control treatment, where no cow dung or nitrogen fertilizer was applied. These gave a total of 25 treatment combinations, laid out in a randomized complete block design, replicated three times. The results showed that, the best cow dung management practice that gave the highest maize grain yields in the two farms was the surface heaped covered in April, nitrogen amended treatment. The non N amended treatments were not able to significantly increase the maize grain yields than the untreated control.
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