Crop Husbandry and Management Practices
What you must understand
This domain covers the routine decisions that turn a planted field into a crop. Know plant population and spacing (wider rows for maize and sunflower, closer for cereals and legumes), thinning, gap filling, weeding schedule, mulching, staking, pruning, earthing up, and ratooning. Understand crop rotation principles: alternate deep and shallow rooters, alternate legumes with cereals, avoid repeating the same family, and never follow a crop with another that shares its pests.
Know intercropping (two crops together), mixed cropping, relay cropping and monocropping, with their advantages (risk spreading, nitrogen sharing, ground cover) and disadvantages (competition, harvesting difficulty, allelopathy). Understand cropping calendar decisions: planting date matched to rainfall, variety maturity length, and the effect of late planting on yield. Know the meaning of lodging, shattering, bolting and determinate versus indeterminate growth.
Traps in questions
- Rotation is not the same as intercropping; rotation is sequential.
- A legume in rotation adds nitrogen for the next crop, not for itself.
- Wider spacing can raise yield per plant while lowering yield per hectare.
- Thinning reduces competition; it is not the same as gap filling.
- Late planting shortens the growing period and reduces yield even with good rain.
Rule of thumb
Rotate by family and rooting depth: cereal after legume, deep rooter after shallow rooter, and never the same family twice in a row.
Worked example
A farmer plants maize late after the first rains. Reason it through: late planting pushes flowering into a drier period and shortens grain filling, so choose a shorter-maturity variety and raise plant density slightly only if moisture allows. The key answer is that late planting reduces the effective growing season and exposes flowering to drought.