EFFECTS OF SOME WEATHER PARAMETERS ON RICE AND TOMATO PRODUCTION IN THE DOWNSTREAM OF TIGA STATION, NIGERIA

B. Adegbehin, S. Mukhtar, Y. Y. Yakubu, C. K. Daudu

Abstract



This study investigates the effects of some weather parameters on rice and tomato production in the Tiga station downstream. Data on rainfall, temperature, evaporation and reservoir water level data for 30 years and 24 years rice and tomato yields were used. The data collected were analyzed using the relative definition method and Pearson's Product Moment Correlation Coefficient. A focus group discussion was conducted to get first-hand information from the farmers. The Relative Definition Method (RDM) showed the rainfall onset, retreat periods and the length of the growing season for the station downstream. The RDM revealed the first decadal of May with cumulative percentage rainfall values of 7.94% for the onset, while the retreat period was the first decadal of October with a cumulative percentage rainfall value of 92.56%. The Pearson's product-moment correlation between climatic variables (rainfall, temperature evaporation) and reservoir water level at Tiga station revealed that only rainfall in Tiga with 0.98 showed a very strong positive significant relationship on the reservoir water level in the study. Similarly, only rainfall showed a strong positive significant relationship between climatic variables and crop yields. The r-value between rainfall amount, rice and tomato production in Tiga station downstream were 0.94 and 0.90 respectively. These showed positive significant relationships between rainfall and these crops implying that an increase in rainfall will lead to an increase in the amount of water available downstream for irrigation farming of rice and tomato and hence, good yields. Temperature and evaporation showed weak relationships on crop yields and positive insignificant relationships on the reservoir water level in the station downstream. Findings from the focus group revealed that 80% of the farmers reported flood occurrences during the rainy season and deficit of water in the latter days of the dry period (mostly between January and March of each year) which might be a result of operational failures(poor storage facilities) in the reservoir station. It was recommended that special projects and strategies should be adopted to address the issue of water deficit during the dry season and overflowing of the reservoir stations during rainy seasons to control surplus and deficit water inflow and outflow in all seasons as well as limits flooding, destruction of cultivated crops, arable lands and properties.

Keywords


Relative definition method, Correlation, Rice, Tomato, Tiga Dam

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