5. Which method uses trenches to guide water across the field? \[ \begin{array}{ll}\text { A) Spray irrigation } \\ \begin{array}{ll}\text { o } & \text { B) Drip irrigation } \\ \text { O Furrow irrigation } \\ \text { () Flood irrigation }\end{array}\end{array} . \]

Furrow irrigation is a classic approach where trenches or furrows are dug along the crop rows, allowing water to flow directly to the plants. This method has been used for centuries, especially in agriculture where water conservation is critical. Its simplicity makes it a favorite for many farmers, especially in areas with varying soil textures. In real-world applications, furrow irrigation is beneficial for crops like corn and cotton, as it provides targeted watering and reduces water waste. However, it's essential for farmers to monitor soil moisture and adjust water flow to avoid over-saturation or drought stress. Getting it right can lead to healthier plants and improved yields!