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NIGERIAN JOURNAL OF SOIL AND ENVIRONMENTAL RESEARCH

Year: 2018|   Volume No: 17|   ISSN: 1595-61-21|   Page No: 50 - 57


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Title:  Optimum Yield and Economic Analysis of Rice (Oryza Sativa L.) Varieties as Affected by Nitrogen Rates under Irrigated Conditions in Gashua, Yobe State, Nigeria
*Ibrahim, U.1, Tiku, N. E.2, Ishaya, D. B.1 and N. M.3

1DEPARTMENT OF AGRONOMY, FACULTY OF AGRICULTURE, FEDERAL UNIVERSITY GASHUA, YOBE STATE, NIGERIA 2DEPARTMNET OF AGRICULTURAL ECONOMICS AND EXTENSION, FEDERAL UNIVERSITY GASHUA, YOBE STATE 3DEPARTMENT OF SOIL SCIENCE, AHMADU BELLO UNIVERSITY, ZARIA, KADUNA STATE

ABSTRACT

The experiment was conducted in two locations at Gashua in Yobe State, Nigeria during the 2016/ 2017 dry season under irrigated conditions to determine optimum yield and economic analysis of five rice varieties with different application rates of nitrogen. Yield data collected were subjected to analysis of variance, where significant differences existed, the Duncan multiple range tests was used to separate the means. The yield data were also analysed using regression analysis to determine the optimum fertilizer rates and the corresponding yield. Economic analysis using the gross margin analysis was estimated. Results obtained from both locations showed that application of 135kgN/ha gave the highest grain yield against all the other rates evaluated. Application of N beyond 135kg N/ha resulted in significantly lower grain yield and lower gross margin. Based on the results of this study, it could be concluded that basal application of 50 kg P 0 ha-1 and 40 kg K O 2 5 2 during land preparation and 135kg Nha-1 split into two halves (at two weeks and at six week after transplanting) increased both the grain yield and gross margin of rice under irrigation in Gashua. The results from regression models also indicated a lower N value below 135kg N ha-1which shows that N application should not exceed 135kg N ha-1in the dry ecology of Gashua.

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