EFFECTS OF RAINFALL, TEMPERATURE VARIATIONS AND FERTILIZER APPLICATION ON CASSAVA YIELD IN ANAMBRA STATE FROM 1977 TO 2006

AUTHOR: DULUORA, JOSEPH OLUCHUKWU

DEPARTMENT: ENVIRONMENTAL MANAGEMENT

AFFILIATION: NNAMDI AZIKIWE UNIVERSITY AWKA

This work was carried out to determine the extent to which rainfall, temperature variability and fertilizer use have affected cassava yield in Anambra State. Descriptive statistics were employed in the data analysis. Purposive and random sampling were used to select the LGAs and towns respectively. Climatic data were collected from NIMET, while cassava yield and fertilizer use was sourced from Nigerian Bureau of Statistics. The calculated PET showed that February has the highest PET value. The water budget of Anambra State revealed a six month water deficit and a six month water surplus with September having the highest water surplus. A trend analysis of rainfall and temperature data for 30years (1977 – 2006) using a 3-year running mean, revealed that the rainfall is relatively constant, while temperature is on the increase. A regression of temperature and rainfall on cassava yield for 12 years (1995 – 2006) showed that an increase in both climatic parameters had a negative effect on cassava yield. Fertilizer application has boosted cassava yield in the last 12 years since the Pearson’s Product Moment correlation of fertilizer use and cassava yield revealed a strong positive relationship. Regression of fertilizer use on cassava yield equally showed a strong positive relationship. Analysis of variance on temperature, rainfall and fertilizer use on cassava yield revealed a strong relationship. Based on the findings of the work, the study made some recommendations such as provision of fertilizer to farmers to boost cassava yield to reduce food shortage, education of farmers on consequences of climate variability on crop production, use of improved varieties and ensuring that peasant farmers get the yearly weather forecast prior to planting season are considered major policy implications.

TO VIEW THE FULL CONTENT OF THIS DOCUMENT, PLEASE VISIT THE UNIZIK LIBRARY WEBSITE USING THIS LINK, http://naulibrary.org/dglibrary/admin/book_directory/Thesis/11008.pdf

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