The correct answer is A) Phosphorus.
Phosphorus is a mineral that is essential for plant growth. It is involved in many important processes, including energy production, cell division, and the synthesis of proteins and nucleic acids. Phosphorus deficiency can cause a number of problems in plants, including stunted growth, yellowing leaves, and poor fruit production.
Red soils are a type of soil that is common in Telangana. They are characterized by their high iron content and their low pH. The low pH of red soils can make it difficult for plants to absorb phosphorus. In addition, the high iron content of red soils can bind to phosphorus, making it unavailable to plants.
To correct phosphorus deficiency in red soils, it is important to add phosphorus-rich fertilizers to the soil. Phosphorus-rich fertilizers can be applied to the soil as a top dressing or incorporated into the soil before planting. It is also important to maintain a neutral pH in the soil. This can be done by adding lime to the soil.
Magnesium, calcium, and iron are also important minerals for plant growth. However, they are not as likely to be deficient in red soils as phosphorus. If you are concerned about the nutrient content of your soil, you can have it tested by a soil testing laboratory.