Final answer:
Calcium hydroxide is used in agriculture to control soil pH. However, excessive use should be avoided.
Step-by-step explanation:
One significant application of calcium hydroxide in agriculture is in the control of soil pH. It can be used to neutralize acidic soil, making it more suitable for plant growth. However, it is important to avoid excessive use of calcium hydroxide because it can raise the pH of the soil too much, leading to nutrient imbalances and potential harm to plants.