Question
Describe the main steps involved in crop production from field preparation to harvesting. Why is each step necessary?
Solution — Step by Step
What: The soil is loosened and turned using a plough (traditional) or tractor-mounted plough. This is called tilling or ploughing.
Why it’s necessary:
- Loosens compacted soil → roots can penetrate deeply
- Improves aeration (air spaces in soil) → root respiration and beneficial soil organisms
- Brings nutrients buried deeper to the surface
- Destroys weeds and kills insect pupae/eggs hiding in the soil
- Improves water retention (loose soil holds water better)
Levelling: After ploughing, the soil is often broken into smaller clumps and levelled. This prevents waterlogging in depressions and ensures uniform growth.
What: Organic manure (compost, farmyard manure — FYM, green manure) or chemical fertilisers (urea, DAP — diammonium phosphate, NPK fertilisers) are added to the soil.
Why it’s necessary:
- Plants need macro-nutrients: Nitrogen (N), Phosphorus (P), Potassium (K), plus micro-nutrients
- After each crop harvest, nutrients are depleted from the soil (the crop takes them away)
- Without replenishment, soil fertility declines and yields fall
- Organic manure also improves soil structure, water retention, and supports soil organisms
- Chemical fertilisers provide specific nutrients in concentrated, readily available form
What: Seeds are placed into the soil at the correct depth and spacing. Methods include broadcast sowing (scattering seeds by hand), drilling (using a seed drill which places seeds at uniform depth and spacing), or transplanting (growing seedlings in a nursery, then transplanting them to the field — used for rice, tomato, cabbage).
Why it’s necessary:
- Correct depth: seeds too shallow may dry out or be eaten by birds; too deep and the seedling may not have enough energy to reach the surface
- Correct spacing: overcrowding causes competition for sunlight, water, and nutrients → poor yields
- Seed drill ensures uniform depth and spacing, reducing seed wastage and improving germination rates
Seeds must be healthy — tested for viability (germination rate) before use.
What: Supplying water to crops. Methods: canal irrigation, well/tube well irrigation, rainwater harvesting, drip irrigation, sprinkler irrigation.
Why it’s necessary:
- Most crops cannot survive on rainfall alone, especially in regions with insufficient or unreliable monsoon
- Water is needed for germination, photosynthesis, nutrient uptake (dissolved nutrients move to roots via soil water), cooling (plants cool by transpiration), and cell turgidity
Overwatering is as harmful as underwatering — it waterloggs the soil, causes root rot, and depletes oxygen needed by roots for respiration. Drip irrigation is most efficient — delivers water directly to roots, minimising evaporation loss.
Weeding: Weeds compete with crops for water, sunlight, nutrients, and space. They also harbour pests and diseases. Weeding is done manually (by hand or hoe), by mechanical cultivators, or using herbicides (chemical weed killers). An important rule: weeding must be done before weeds flower and set seed, to prevent re-seeding.
Pest management: Insects, fungi, bacteria, and viruses can destroy crops. Pest control methods include: chemical pesticides, biological control (introducing natural predators of the pest), crop rotation (breaking pest life cycles), and resistant crop varieties.
Harvesting: When the crop is mature, it is cut and collected. Can be done manually (sickle) or mechanically (combine harvester). After cutting, the grain must be separated from the stalk (threshing) and from chaff (winnowing). The harvested grain is then stored.
Storage: Stored grain must be dry and protected from moisture, pests, and fungi. Silos and warehouses use pesticides, controlled humidity, and sometimes inert gas atmospheres (to prevent oxidation and pest survival).
Why This Works
Each step in crop production solves a specific problem:
| Step | Problem it solves |
|---|---|
| Ploughing | Compacted, aerated-poor soil |
| Manuring | Nutrient depletion |
| Sowing | Getting seeds to germinate uniformly |
| Irrigation | Water scarcity |
| Weeding | Competition from weeds |
| Pest control | Crop damage from insects/diseases |
| Harvesting | Collecting mature grain efficiently |
Modern agriculture works as a system — neglecting any one step reduces the final yield. Green Revolution crops were developed to have high yields IF all inputs (fertiliser, water, pest control) were provided — they are called High Yielding Varieties (HYVs).
Alternative Method — Kharif vs Rabi Classification
Crops are often classified by season in India:
- Kharif crops (monsoon season, June–November): Rice, maize, soybean, groundnut, cotton. Sown at the onset of monsoon.
- Rabi crops (winter, November–April): Wheat, mustard, lentil, gram. Sown after monsoon when temperatures are lower.
The crop production steps are the same for both, but the specific timing, irrigation requirements, and pest patterns differ.
Common Mistake
Students sometimes write “watering” and “irrigation” as the same thing. In agricultural science, irrigation specifically refers to the organised supply of water to fields through channels, wells, or sprinklers. Watering a garden at home is not irrigation. Also, do not say “fertilisers are the same as manure” — manure is organic (derived from decomposed plant/animal matter); fertilisers include both organic and synthetic/chemical products.
For CBSE Class 8 questions on “Agricultural Practices,” the list of steps follows the NCERT order: Soil preparation → Sowing → Manuring → Irrigation → Weeding → Harvesting → Storage. Memorise this sequence — exam questions often ask for the sequence or a specific step’s purpose.