---
title: "Irrigation — AP Human Geography Definition & Exam Guide"
description: "Irrigation is the artificial application of water to cropland. In AP Human Geo, it links agricultural hearths, the Green Revolution, and consequences like soil salinization."
canonical: "https://fiveable.me/ap-hug/key-terms/irrigation"
type: "key-term"
subject: "AP Human Geography"
---

# Irrigation — AP Human Geography Definition & Exam Guide

## Definition

Irrigation is the artificial application of water to soil or land to assist in the growth of crops. This practice is crucial in agriculture, especially in arid regions where natural rainfall is insufficient. By controlling water supply, irrigation helps increase crop yields and supports agricultural productivity, influencing economic stability and food security.

## Related Study Guides

- [5.3 Agricultural Origins and Diffusions](/ap-hug/unit-5/agricultural-origins-diffusions/study-guide/0w8PoDg8fpwGgA1KPnjV)
- [5.10 Consequences of Agricultural Practices](/ap-hug/unit-5/consequences-agricultural-practices/study-guide/RAzF4S3Shg41OlgCRS59)
- [5.1 Introduction to Agriculture](/ap-hug/unit-5/intro-agriculture/study-guide/ascRt2BlCv4BX7lfzXSM)
- [5.5 The Green Revolution](/ap-hug/unit-5/green-revolution/study-guide/p227kJki0IrxMhcz5WFW)

## Review

### Related Terms

- [Drought](/ap-hug/key-terms/drought): A prolonged period of abnormally low rainfall, leading to water shortages that can severely affect agricultural production.
- [Crop Rotation](/ap-hug/key-terms/crop-rotation): The practice of alternating the species or families of crops grown on a particular piece of land to improve soil health and reduce pests.
- Aquifer: A geological formation that can store and transmit groundwater, often tapped for irrigation through wells.

### Key Facts

- Irrigation systems can vary widely, from simple surface irrigation methods like furrows and flood irrigation to advanced techniques such as drip irrigation and sprinklers.
- Historically, civilizations like the Mesopotamians and Egyptians developed sophisticated irrigation systems that allowed them to thrive in arid climates.
- Irrigation has enabled the intensification of agriculture, allowing farmers to cultivate multiple crops per year instead of relying on seasonal rainfall.
- Excessive irrigation can lead to problems such as soil salinization and waterlogging, negatively impacting crop health and soil quality.
- Modern irrigation practices are increasingly being integrated with technology, including sensors and automated systems, to optimize water usage and improve efficiency.

### How does irrigation influence agricultural productivity in arid regions?

Irrigation significantly boosts agricultural productivity in arid regions by providing a reliable water source where rainfall is scarce. This controlled water supply allows for the cultivation of crops that would otherwise fail due to drought conditions. Moreover, it enables farmers to grow multiple harvests in a year, increasing overall food production and supporting local economies.

### Discuss the environmental consequences of improper irrigation practices.

Improper irrigation practices can lead to serious environmental consequences such as soil salinization, where excess salts accumulate in the soil due to over-irrigation. This affects soil fertility and crop yields, making it difficult for plants to absorb necessary nutrients. Additionally, poor irrigation can result in waterlogging, which disrupts root development and leads to plant stress or death. These issues not only harm individual farms but can also threaten local ecosystems and biodiversity.

### Evaluate the role of modern technology in improving irrigation efficiency and its impact on global food security.

Modern technology plays a crucial role in improving irrigation efficiency through precision agriculture techniques. Innovations like drip irrigation, smart sensors, and automated systems allow farmers to optimize water use, significantly reducing waste while enhancing crop yields. By ensuring that water resources are utilized more effectively, these advancements contribute to global food security by enabling consistent food production in regions facing water scarcity, thus helping meet the needs of a growing population.