Seed Rate Calculator India — Optimising Crop Planting for Maximum Yield
Seed rate is the quantity of seed required to plant one hectare (or acre) of land at optimal plant density. Using the correct seed rate is critical for achieving target plant population — too little seed leads to sparse crops and yield loss; too much wastes expensive seeds and causes overcrowding that reduces individual plant yield and increases disease risk.
Seed Rate Formula: Seed Rate (kg/ha) = (Target Plant Population per ha × 1000 × Seed Weight in grams) ÷ (Germination % × 10,000). The target population depends on the crop variety and spacing recommendation from ICAR (Indian Council of Agricultural Research). Always add 10-15% extra to account for field losses from poor germination, pest damage, and irregular moisture.
Reference Seed Rates for Major Indian Crops: Wheat: 100-125 kg/ha (transplanted varieties may use less). Paddy: 20-25 kg/ha for transplanting nursery; 80-100 kg/ha for direct seeding. Maize: 20-25 kg/ha. Soybean: 70-80 kg/ha. Cotton: 3-5 kg/ha (hybrid varieties vary significantly). Groundnut: 100-120 kg/ha (shelled). Sunflower: 5-7 kg/ha. These are general recommendations — your KVK (Krishi Vigyan Kendra) can provide variety-specific rates for your agroclimatic zone.
Germination Testing — Before You Calculate: Before sowing, conduct a germination test: take 100 seeds randomly from the lot, place on moist cloth at room temperature for 3-7 days, count germinated seeds. Germination % = germinated seeds ÷ 100 × 100. If only 80 of 100 seeds germinate, the seed rate must be increased proportionally (÷ 0.80 instead of ÷ 0.90 for 90% germination). Poor germination from old, improperly stored seeds is a major cause of low plant populations and yield losses.
Certified vs Farm-Saved Seeds: Certified seeds from government certified seed companies (National Seeds Corporation, State Farms Corporation) have guaranteed germination and genetic purity. Farm-saved seeds may have lower germination, variety mixing, and seed-borne diseases. The extra cost of certified seed (typically ₹2,000-5,000 per quintal premium over farm seed) is almost always recovered through better yield and uniformity. PM Fasal Bima Yojana also has provisions for seed replacement to certified varieties.
CalcuTools India · Free calculator · Updated July 2026 · FY 2025-26 · Not financial advice · About · How we verify
Seed Rate Planning for Indian Crops
Using the correct seed rate is critical for optimal plant population, which directly determines yield potential. Too few seeds results in gaps and unused field area; too many wastes expensive seed and creates overcrowded plants that compete for nutrients and light, reducing individual plant productivity.
Why Germination Percentage Matters
Certified seeds from government agencies or reputable companies typically achieve 85-95% germination. If germination is only 80%, you need to sow 25% more seed to achieve the same final plant population as seeds with 100% germination. Always get a germination test done on stored seed before sowing season — germination rates decline with improper storage.
Line Sowing vs Broadcasting
Line/row sowing uses 10-20% less seed than broadcasting for the same plant population, while improving weed control, irrigation efficiency, and mechanical harvesting ease. Broadcasting is faster but wastes seed due to uneven distribution.
Frequently Asked Questions
Where can I get certified seed in India? +
State Seed Corporations, National Seeds Corporation (NSC), and registered private seed companies supply certified seeds. NSC's e-commerce portal allows online ordering. Your local Krishi Vigyan Kendra (KVK) can advise on the best variety for your region.
How do I test seed germination at home? +
Take 100 seeds at random, spread on a moist cloth or paper towel, and keep in a warm place. Count the germinated seeds after 7-10 days (varies by crop). This percentage is your expected field germination.
Should I treat seeds before sowing? +
Seed treatment with fungicides, insecticides, and bio-inoculants (Rhizobium for legumes, Trichoderma for soil-borne disease protection) significantly improves germination and early plant establishment, and is recommended by ICAR for most crops.
🔄 Last Updated: July 2026
Formula
Formula: Seed Rate (kg/ha) = (Plant Density × 1000 × Seed Weight) ÷ (Germination % × 10,000). Adjust for field losses (typically add 10–15% extra).
Worked Example
Wheat: Target 200 plants/m², 1000-grain weight = 40g, 90% germination. Seed rate = (200 × 40) ÷ (90 × 10) = 88.9 kg/ha. Add 10% for losses: buy 98 kg/ha. Standard recommendation: 100–125 kg/ha for wheat.