Sulfur is an important nutrient for crops, just like nitrogen, phosphorus, and potassium. Many farmers in India know about NPK, but sulfur often gets ignored. Over the years, soil sulfur levels have decreased because of continuous farming, use of high-analysis fertilizers, and removal of crop residues. This has led to yellowing leaves, weak plant growth, and lower yields in many crops. Knowing the correct sulfur requirement per acre helps farmers grow healthier crops and improve productivity.
How Much Sulfur Do Crops Need?
The recommended sulfur dose depends on the crop, soil type, and expected yield. Different crops have different nutrient needs. Oilseed crops like mustard, groundnut, and sunflower require higher sulfur. Pulses, cereals, and vegetables need moderate amounts. However, as a general guideline, most Indian soils require 20–40 kg sulfur per acre to maintain crop health.
Below is an easy breakdown:
Oilseeds (mustard, groundnut, soybean): 25–40 kg sulfur per acre
Pulses (chickpea, moong, urad): 15–25 kg sulfur per acre
Cereals (wheat, maize, jowar): 10–20 kg sulfur per acre
Vegetables (onion, garlic, cabbage): 20–30 kg sulfur per acre
Cash crops (sugarcane, cotton): 20–30 kg sulfur per acre
These values may vary slightly depending on local soil test results.
Why Do Farmers Need to Apply Sulfur?
Modern fertilizers like urea, DAP, and MOP contain little or no sulfur. Earlier, single super phosphate (SSP) and other fertilizers supplied sulfur naturally. Today, because farmers use high-analysis fertilizers, sulfur deficiency has become common. Symptoms include:
Yellowing between veins (similar to nitrogen deficiency)
Poor tillering in cereals
Small-sized pods in oilseeds
Reduced oil content
Weak plant growth
Applying the right sulfur dose helps improve protein synthesis, oil content, and overall plant health.
Which Sulfur Sources Are Best for Farmers?
Farmers can apply sulfur using different fertilizers:
Single Super Phosphate (SSP)
Contains 12% sulfur
Also supplies phosphorus
Good for cereals, pulses, and oilseeds
Gypsum
Contains 15–18% sulfur
Affordable and easy to apply
Suitable for all crops
Bentonite Sulfur Pastilles
Contains 80–90% sulfur
Releases sulfur slowly
Good for long-term soil improvement
Ammonium Sulfate
Contains 24% sulfur and 21% nitrogen
Useful when both nitrogen and sulfur are needed
Choosing the right source depends on availability, crop need, and soil condition.
How and When to Apply Sulfur?
Sulfur should be mixed well into the soil before sowing. This ensures uniform availability during early crop stages. In standing crops like sugarcane, farmers can apply it during earthing-up. For bentonite sulfur, apply it 2–3 weeks before sowing so that it breaks down properly.
Final Advice
For best results, farmers should use soil testing to know the exact sulfur requirement of their field. But as a general rule, applying 20–40 kg sulfur per acre improves growth, yield, and quality across most crops.
Effective sulfur management is a simple step that can significantly boost farm productivity.
