Q1: Which of the following is not a measure component necessarily to be present in fertilisers?

ANS:D - Sulphur

Sulphur is not a measure component necessarily present in fertilizers. While nitrogen, potassium, and phosphorus are primary nutrients essential for plant growth and are commonly found in fertilizers, sulphur is considered a secondary nutrient. While it can be beneficial for certain crops and soils, it is not always included in fertilizer formulations. Sulphur is an essential nutrient for plant growth, playing various roles in plant metabolism. It is a component of amino acids, vitamins, enzymes, and proteins, and is crucial for processes such as photosynthesis, nitrogen fixation, and the synthesis of certain vitamins. In agriculture, sulphur is considered a secondary nutrient, meaning it is needed by plants in smaller quantities compared to primary nutrients like nitrogen, phosphorus, and potassium. While many soils naturally contain sulphur, deficiencies can occur, particularly in soils with low organic matter content or in regions with high rainfall that leaches sulphur from the soil. Sulphur deficiencies can manifest as yellowing of leaves, reduced growth, and decreased crop yields. To address sulphur deficiencies, sulphur-containing fertilizers may be applied to soil or foliage. These fertilizers can come in various forms, such as elemental sulphur, sulphate-containing compounds like ammonium sulphate or potassium sulphate, or organic materials rich in sulphur. Overall, sulphur is an important element for plant health and productivity, and its availability in the soil directly impacts crop growth and yield.