Magnesium oxide (MgO) is widely used in the agricultural industry for various applications. 

Here are some of its applications:

1. Soil amendment: Magnesium oxide is used as a soil amendment to correct magnesium deficiency in soils.Magnesium is an essential nutrient for plants and plays a crucial role in chlorophyll synthesis and enzyme activation. Adding magnesium oxide to the soil helps to improve the nutrient balance and enhance plant growth.

2. Fertilizer ingredient: Magnesium oxide is also used as an ingredient in fertilizers.It provides a slow-release source of magnesium, ensuring a steady supply of this essential nutrient to plants over time. This helps to prevent magnesium deficiency and improve crop yield and quality.

3. pH adjustment: Magnesium oxide is alkaline in nature and can be used to adjust the pH of acidic soils. By raising the pH, it helps to create a more favorable environment for plant growth and nutrient availability.

4. Livestock feed supplement: Magnesium oxide is commonly used as a feed supplement for livestock, 

especially for ruminants like cows and sheep. It helps to prevent magnesium deficiency, which can lead to health issues like grass tetany in animals. Adding magnesium oxide to animal feed ensures a sufficient intake of this essential mineral.

Overall, magnesium oxide is an important tool in the agricultural industry for maintaining soil fertility, 

improving crop productivity, and ensuring the health and well-being of livestock.