The Effect of Climate Change on Crop Yield in Nigeria (2010–2024)

CHAPTER ONE

1.1 Background of the Study

Agriculture remains a critical sector in Nigeria, contributing significantly to employment, food security, and economic growth. However, in recent decades, the sector has been increasingly affected by the global challenge of climate change. Climate change refers to long-term alterations in temperature, rainfall patterns, and weather extremes resulting from human and natural factors (IPCC, 2023). These changes directly affect crop production, soil fertility, and water availability, making food production less predictable.

Nigeria, with its predominantly rain-fed agriculture, is highly vulnerable to changing climatic conditions. The country experiences erratic rainfall, prolonged dry spells, and increasing temperatures, all of which disrupt planting and harvesting schedules. Studies show that changes in temperature and rainfall patterns reduce yields of staple crops such as maize, rice, yam, and cassava (Ajetomobi & Abiodun, 2021). For example, high temperatures during flowering stages often lead to poor pollination, while excessive rainfall causes flooding and crop losses.

The impact of climate change on agriculture extends beyond yield reduction. It increases food insecurity, affects farmers’ income, and limits rural development. Farmers have begun to adapt through early planting, crop diversification, and irrigation, but these strategies remain inadequate without strong policy support and climate-smart technologies.

This study therefore examines the effect of climate change on crop yield in Nigeria between 2010 and 2024. It focuses on identifying the specific climatic factors influencing crop output and assessing farmers’ adaptation strategies.

1.2 Statement of the Problem

The agricultural sector in Nigeria faces serious threats from climate change. Frequent droughts, unpredictable rainfall, and rising temperatures continue to reduce the productivity of major food crops. Although several adaptation initiatives have been introduced, crop yields remain unstable, leading to food shortages and increased import dependence.

The main problem lies in the lack of empirical evidence on how climate variables such as temperature, rainfall, and humidity specifically affect crop yields over time. Understanding this relationship is essential for designing effective agricultural and environmental policies. This study aims to fill that gap by analyzing the long-term effect of climate change on crop production in Nigeria.

1.3 Objectives of the Study

The main objective of this study is to analyze the effect of climate change on crop yield in Nigeria from 2010 to 2024. The specific objectives are to:

1. Examine the trend of climatic changes in Nigeria during the study period.

2. Assess the impact of rainfall and temperature variations on crop yields.

3. Identify the adaptation strategies used by farmers to cope with climate change.

4. Provide policy recommendations for improving agricultural resilience.

1.4 Research Questions

1. What are the trends of temperature and rainfall changes in Nigeria between 2010 and 2024?

2. How do climate variables such as rainfall and temperature affect crop yields?

3. What adaptation strategies are employed by farmers to mitigate the effects of climate change?

4. What policies can enhance resilience and improve crop productivity?

1.5 Hypotheses

• H₀: Climate change has no significant effect on crop yield in Nigeria.

• H₁: Climate change has a significant effect on crop yield in Nigeria.

1.6 Significance of the Study

This study provides useful insights into the relationship between climate change and agricultural productivity. The findings will help policymakers, researchers, and farmers understand how environmental changes affect food security. It will also guide the development of adaptive measures such as irrigation, improved seed varieties, and early warning systems. For students and researchers, the study will serve as a reference for future research on agricultural resilience and climate-smart practices.

1.7 Scope of the Study

The study focuses on Nigeria and covers the period from 2010 to 2024. It examines climatic variables such as rainfall, temperature, and humidity, as well as the yields of key staple crops including maize, rice, cassava, and yam. The analysis uses data from the Nigerian Meteorological Agency (NiMET), the Food and Agriculture Organization (FAO), and the National Bureau of Statistics (NBS).

1.8 Definition of Terms

Climate Change: Long-term changes in temperature, precipitation, and other weather patterns affecting the environment.
Crop Yield: The amount of agricultural output produced per hectare of farmland.
Adaptation Strategies: Methods used by farmers to adjust and respond to climate-related challenges.
Rain-Fed Agriculture: Farming practices that depend on natural rainfall rather than irrigation systems.

References

Ajetomobi, J., & Abiodun, A. (2021). Climate Variability and Agricultural Productivity in Sub-Saharan Africa. Ibadan: Spectrum Books.
Intergovernmental Panel on Climate Change (IPCC) (2023). Sixth Assessment Report. Geneva: IPCC.
National Bureau of Statistics (2023). Agricultural Output and Climate Data Report. Abuja: NBS.