Agriculture: Agronomy, Horticulture, Plant Protection and Soil Science
Agriculture dominates UPCATET scoring, and questions are applied: a package of practices - variety, seed rate, nutrient dose, plant-protection schedule - must be matched to a soil, climate or cropping situation rather than recited.
Agronomy
Cropping intensity = (gross cropped area ÷ net sown area) × 100. Cropping systems are judged by land equivalent ratio and by whether a legume in the rotation fixes nitrogen for the cereal that follows. Tillage questions hinge on primary (ploughing) versus secondary (harrowing) operations, and on why zero tillage conserves moisture and organic carbon.
Horticulture
Pomology (fruits), olericulture (vegetables) and floriculture (flowers) are separated by purpose, not plant type. Know vegetative propagation - cutting, layering, budding, grafting - plus parthenocarpy (banana, seedless grape) and apomixis (mango seedlings true to type).
Plant Protection
The disease triangle needs a susceptible host, a virulent pathogen and a favourable environment; remove one and the epidemic fails. IPM ranks cultural, mechanical and biological methods before chemicals, and sprays are justified only at the economic threshold level.
Soil Science
Texture, pH, electrical conductivity, organic carbon and cation exchange capacity drive fertility answers. Nutrient availability peaks near pH 6.5–7.5; below 6.5, aluminium toxicity and phosphorus fixation rise.
Worked example
A recommendation of 120 kg N, 60 kg P₂O₅ and 40 kg K₂O per ha, with urea (46% N), DAP (18–46–0) and MOP (60% K₂O). Straight urea would need 120 ÷ 0.46 ≈ 261 kg. Using DAP first: 60 ÷ 0.46 ≈ 130 kg DAP, which also supplies 130 × 0.18 ≈ 23 kg N, so urea falls to (120 − 23) ÷ 0.46 ≈ 211 kg; MOP = 40 ÷ 0.60 ≈ 67 kg.
Traps
Mixing kg/acre with kg/ha (1 ha = 2.47 acre); treating DAP as a pure phosphorus source; quoting P instead of P₂O₅; confusing ETL with the economic injury level; ignoring how germination and purity percentages raise the seed rate.