Explore the importance, sources, and management of sulphur fertilization in modern agriculture. Assess your understanding of how sulphur impacts crop nutrition and yields.
Which major plant process is directly influenced by adequate sulphur fertilization in crops like canola and soybean?
Explanation: Sulphur is a vital component of certain amino acids and proteins, making it essential for protein synthesis in plants. Chlorophyll degradation is not a direct function of sulphur, while stomatal closure is more related to potassium. Fruit ripening acceleration is influenced by other nutrients like potassium and ethylene, not sulphur.
If a field of wheat shows uniform yellowing of younger leaves without necrotic spots, which nutrient is most likely deficient?
Explanation: Sulphur deficiency usually results in uniform chlorosis (yellowing) of younger leaves since sulphur is less mobile in the plant. Nitrogen deficiency affects older leaves first, calcium deficiency shows as tip burn, and phosphorus deficiency often causes purpling or stunted growth rather than yellowing.
Which of the following is commonly used as a sulphur-containing fertilizer in agricultural fields?
Explanation: Ammonium sulphate provides both nitrogen and sulphur, making it a popular sulphur fertilizer. Muriate of potash supplies potassium, urea is a nitrogen fertilizer, and triple superphosphate is a major source of phosphorus but not sulphur.
Apart from fertilizer application, which environmental factor is a significant natural source of sulphur for agricultural soils?
Explanation: Atmospheric deposition, especially via rainfall, contributes sulphur to soils as sulphate from industrial emissions and natural processes. Runoff typically carries nutrients away; mulch decomposition releases sulphur slowly, and windborne sand particles are not a notable sulphur source.
Why is it important to synchronize sulphur fertilizer application with the most active growth stages of crops?
Explanation: Applying sulphur when crops have the highest demand helps maximize nutrient uptake and productivity. It does not directly impact weed control, pesticide performance, or soil compaction, which are managed through other agronomic practices.