Which of the following is a method of agriculture conservation?

Implementing drip irrigation systems is a recognized method of agricultural conservation because it optimizes water use efficiency and reduces waste. Drip irrigation delivers water directly to the plant’s root zone through a network of tubing and emitters. This targeted approach minimizes evaporation and runoff, which are common issues with traditional irrigation methods like flooding or sprinkling. By conserving water and ensuring that it reaches the plants where it's most needed, drip irrigation supports sustainable farming practices.

In contrast, options such as using chemical fertilizers can lead to soil degradation and potential water contamination, while increasing crop variety, although beneficial for biodiversity, does not directly address resource conservation. Raising livestock can also contribute to nutrient cycling but may not inherently conserve resources like water or minimize environmental impact as effective irrigation systems do.