Abstract
Temperature and rainfall are important variables that affect maize yield, and as such this study aimed at evaluating the impact of onset, cessation of rainfall and temperature on maize yield in Akure. To achieve this objective, climatic parameters comprising daily rainfall and temperature (maximum and minimum temperature) 1981-2016 for Akure, were obtained from the archives of the Nigerian Meteorological Agency, NiMet. Annual maize yield data for the same period 2000-2016 were obtained from Ondo State Agricultural Development Programme. Walter’s method, as modified by [1], was then used to determine the onset, cessation and length of growing season. The significance of the annual trend of these climatic parameters was also tested using an approach involving z-test and p-value analysis. Likewise, the significance of all the climatic parameters contributing to maize yield was also determined based on the p-value approach under a null hypothesis. The coefficients of determination (R2) and Pearson correlation coefficient (r) in relation to the SLR and MLR models were calculated. The result showed a slight decreasing trend of rainfall, increasing trend of maximum, minimum and maize yield. Their associated p-values are 0.6925, 0.5794, 0.5136 and 0.0630, which showed that the trend over the years was not statistically significant at the 1%, 5% and 10% levels; however maize yield was significant at 10% significant level. The mean onset, cessation and length of growing season for Akure were 8th March ± 9, 21st October ± 21 and 239 days ± 27 days. The relationship between maize yield and all climatic variables in association with SLR model showed that rainfall was the major contributing variable to maize yield in Akure, Ondo State at all significant levels (p-value (0.009539) r = 61%, R2 = 37%). The p-value in association with MLR model, also showed that rainfall was significant at 5% and 10%. P (0.019412) r = 72%, R2 = 51%.
Highlights
The knowledge and variation of rainfall onset, cessation and length of the growing season both at national and international level is paramount, as many agricultural activities and planning for sustainable food yield depend on rainfall for land preparation, seed/crop planting and harvesting [2].[3] observed that the irregularity of onset and cessation of the rainy season across many regions over the years had made it difficult for farmers to optimize the seed planting period and adjust to the length of the growing season
The relationship between maize yield and all climatic variables in association with Single Linear Regression (SLR) model showed that rainfall was the major contributing variable to maize yield in Akure, Ondo State at all significant levels (p-value (0.009539) < 0.01, 0.05 and 1 r = 61%, R2 = 37%)
This paper aims to evaluate the annual variations and patterns in the rainfall onset/cessation dates, length of growing season and temperature in relation to maize yield in Akure
Summary
[3] observed that the irregularity of onset and cessation of the rainy season across many regions over the years had made it difficult for farmers to optimize the seed planting period and adjust to the length of the growing season. As many regions over the world are expected to experience substantial modifications as a result of climate variability. These changes are expected to affect the onset and cessation of the rainy season which has become irregular over the years [4]. The determination of the onset and retreat dates of the rainy season in various regions across the world has become a challenge for many researchers [7]
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