Assessment of Pesticide Use and Its Environmental Impact on Vegetable Farms in Southwestern Nigeria

CHAPTER ONE

1.1 Background to the Study

Vegetable farming plays a major role in Nigeria’s agricultural system. It provides income, nutrition, and employment for many households. In southwestern Nigeria, vegetables such as tomatoes, okra, and leafy greens are cultivated both for local consumption and for urban markets. However, pest infestation remains a serious challenge for farmers. To control pests, many rely heavily on chemical pesticides (Oluwaseun & Akintunde, 2021).

While pesticides increase crop yields, their misuse has serious consequences. Excessive or improper application can contaminate soil, water, and air. It can also harm non-target organisms, including pollinators and beneficial insects (FAO, 2020). Moreover, pesticide residues on vegetables may pose health risks to consumers. The environmental and health effects of pesticide use have become a growing concern among researchers and policymakers.

In Nigeria, poor regulation and limited awareness contribute to unsafe pesticide practices. Farmers often apply higher doses than recommended or mix different chemicals without proper guidance. According to Adeoye et al. (2022), this problem is made worse by low literacy levels and weak extension support services.

Therefore, assessing pesticide use and its environmental effects is essential for ensuring sustainable vegetable production. Understanding how pesticides affect soil quality, biodiversity, and human health can guide the development of safer farming methods. This study focuses on pesticide use in southwestern Nigeria, where vegetable farming is common and environmental impacts are increasingly visible.

1.2 Statement of the Problem

The widespread use of pesticides in vegetable farming has raised environmental and health concerns. Many farmers apply chemicals without following safety instructions. As a result, pesticide residues accumulate in the soil and water, reducing soil fertility and harming aquatic life.

Although pesticides help control pests, their long-term effects can outweigh their short-term benefits. Poor handling and lack of protective equipment also expose farmers to toxic substances. Despite these risks, there is limited data on how pesticide use affects the environment in southwestern Nigeria.

This study therefore seeks to evaluate the patterns of pesticide use, identify the types of chemicals applied, and examine their environmental consequences on vegetable farms.

1.3 Objectives of the Study

The main objective of this study is to assess the environmental impact of pesticide use on vegetable farms in southwestern Nigeria. The specific objectives are to:

1. Identify the types and frequency of pesticide use among vegetable farmers.

2. Examine the level of farmers’ knowledge and safety practices in pesticide application.

3. Analyze the environmental effects of pesticides on soil, water, and biodiversity.

4. Recommend strategies for safe and sustainable pesticide management.

1.4 Research Questions

1. What types of pesticides are commonly used by vegetable farmers in southwestern Nigeria?

2. How knowledgeable are farmers about safe pesticide practices?

3. What are the major environmental impacts of pesticide use in vegetable farming?

4. What measures can promote safe pesticide application and environmental protection?

1.5 Research Hypotheses

• H₀₁: Pesticide use has no significant effect on the environment in vegetable farms in southwestern Nigeria.

• H₀₂: There is no significant relationship between farmers’ pesticide handling practices and environmental degradation.

1.6 Significance of the Study

This study is important because it highlights the link between pesticide use and environmental sustainability. The results will help policymakers and agricultural extension officers design awareness programs that promote safe pesticide use.

It will also guide farmers on how to reduce chemical dependency and adopt integrated pest management (IPM) practices. Environmental agencies can use the findings to strengthen regulations and protect ecosystems from harmful contamination. Academically, this study adds valuable knowledge to agricultural and environmental research in Nigeria.

1.7 Scope and Limitations of the Study

The study focuses on selected vegetable farms in southwestern Nigeria, covering states such as Oyo, Ogun, and Osun. It assesses pesticide usage patterns, environmental effects, and farmers’ safety awareness.

Limitations may include farmers’ reluctance to disclose pesticide types, time constraints, and challenges in collecting environmental samples. Despite these limitations, the study offers useful insights into the environmental consequences of pesticide use.

1.8 Definition of Key Terms

• Pesticide: A chemical substance used to kill or control pests, including insects, weeds, and fungi.

• Environmental Impact: The effect of human activities, such as pesticide use, on the natural ecosystem.

• Vegetable Farming: The cultivation of edible plant crops for human consumption.

• Integrated Pest Management (IPM): A sustainable approach to pest control that combines biological, cultural, and chemical methods.