Agronomy and Crop Production: Season, Seed Rate and Nutrient Calculations
Agronomy and Crop Production is the science of raising field crops. The BSEH NSQF exam tests season–crop matching, seed rate, sowing geometry, nutrient calculations, critical irrigation stages and cropping systems.
Core rules
- Haryana has two main seasons: kharif (June–October; paddy, cotton, bajra, guar) and rabi (October–April; wheat, mustard, gram). Wheat–paddy is common, but a legume in the rotation improves soil nitrogen.
- Use certified seed, treat seed before sowing, and sow at the recommended depth and spacing. Line sowing with a seed drill is more uniform than broadcasting.
- Fertilizer doses are written as kg N–P2O5–K2O per hectare. Convert to bags using nutrient content: urea 46% N, DAP 46% P2O5 and 18% N, MOP 60% K2O.
- Critical stages include wheat crown root initiation at about 20–25 days after sowing, paddy panicle initiation, mustard flowering, and cotton flowering and boll formation.
Worked example
A 0.4 ha wheat plot needs 120 kg N/ha. Total N = 120 × 0.4 = 48 kg. Urea needed = 48 ÷ 0.46 = 104.3 kg. If 60 kg P2O5/ha is also required, DAP = 60 ÷ 0.46 = 130.4 kg/ha, which supplies 130.4 × 0.18 = 23.5 kg N/ha. The balance N is 120 − 23.5 = 96.5 kg/ha, so urea = 96.5 ÷ 0.46 = 209.8 kg/ha. For 0.4 ha, urea = 83.9 kg and DAP = 52.2 kg. Keep every step on a per-hectare basis before scaling.
Traps that cost marks
1 hectare = 2.47 acre, so per-acre and per-hectare doses are not interchangeable. Do not top-dress before the first irrigation, broadcast urea on wet foliage, ignore germination percentage, or use gross plot area when the question asks for net cropped area. Do not confuse CRI with flowering.