Crop Production and Management — Question 4
Back to all questionsQuestion 4
Write a paragraph in your own words on each of the following.
(a) Preparation of soil
(b) Sowing
(c) Weeding
(d) Threshing
(a) Preparation of soil — Preparation of soil is primary step before growing a crop. It involves loosening and turning of soil. The process of loosening and turning of the soil is called tilling or ploughing. Turning the soil and loosening it allows the roots to penetrate deep into the soil. The loose soil allows the roots to breathe easily even when they go deep into the soil. The loosened soil helps in the growth of earthworms and microbes present in the soil. Since only a few centimetres of the top layer of soil supports plant growth, turning and loosening of soil brings the nutrient-rich soil to the top so that plants can use these nutrients.
(b) Sowing — Sowing of seeds is done after ploughing of land. Before sowing, good quality, clean and healthy seeds of a good variety are selected and are put into water. The floating seeds are rejected as they are damaged or hollow. Seeds are either broadcasted by hand or are sown with the help of traditional tool with a funnel. Nowadays the seed drill is used for sowing with the help of tractors. This sows the seeds uniformly at equal distance and depth. It ensures that seeds get covered by the soil after sowing. This protects seeds from being eaten by birds. Sowing by using a seed drill saves time and labour.
(c) Weeding — Undesirable plants growing naturally along with the crop are called weeds. The removal of weeds is called weeding. Weeding is necessary since weeds compete with the crop plants for water, nutrients, space and light. Thus, they have adverse effect on the growth of the crop. Weed management can be done by following ways:
- tilling before sowing uproots and dries weeds.
- manual removal with help of khurpi.
- by using chemicals, known as weedicides. For example, 2,4-D
(d) Threshing — The process of separation of the grains from the chaff is called threshing. The primary goal of threshing is to extract the edible part of the plant, which is the grain or seed, from the non-edible parts. It is done with the help of threshing machine or combine. A combine is a harvester as well as a thresher.
Chapter Overview: Crop Production and Management
This chapter covers the complete agricultural cycle from soil preparation to grain storage. Students learn about Kharif and Rabi crops, modern and traditional irrigation methods, the difference between manure and fertiliser, and how food grains are harvested, threshed, and stored. Animal husbandry is introduced as a complementary food production practice.
Board Exam Weightage: 5-7 marks | Difficulty: Moderate
Key Formulas & Concepts
| Concept | Details |
|---|---|
| Kharif Crops | Sown in June-July (monsoon season); harvested in September-October. Examples: paddy, maize, soybean, cotton |
| Rabi Crops | Sown in October-November (winter); harvested in March-April. Examples: wheat, gram, pea, mustard |
| Drip Irrigation | Water delivered drop by drop at plant roots; most water-efficient method |
| Sprinkler Irrigation | Water sprayed through rotating nozzles; suitable for uneven land |
Must-Know Concepts
- Soil preparation loosens soil and brings nutrients to the surface
- Seed drill ensures uniform spacing and depth of sowing
- Manure is organic (plant/animal waste), fertiliser is chemical (NPK)
- Weeds compete with crops for water, nutrients, and sunlight
- Combine harvester does harvesting and threshing simultaneously
- Grains must be dried to reduce moisture before storage
Manure vs Fertiliser
| Feature | Manure | Fertiliser |
|---|---|---|
| Source | Plant/animal waste (organic) | Chemical factories (inorganic) |
| Nutrients | All nutrients + humus | Specific (N, P, or K) |
| Soil Effect | Improves soil texture and water-holding | No improvement; may degrade soil over time |
| Speed | Slow-acting, long-lasting | Fast-acting, short-term |
| Pollution | None | Excessive use causes soil/water pollution |
Common Mistakes to Avoid
- Confusing Kharif and Rabi crops and their growing seasons
- Thinking manure and fertiliser are interchangeable
- Not knowing the difference between threshing and winnowing
- Forgetting that irrigation means artificial water supply, not rainfall
Scoring Tips
- Learn crop classification with seasonal memory aids
- Draw flowcharts of the complete crop production process
- Compare irrigation methods in a table for quick revision
- Practice NCERT in-text questions for definitions
Frequently Asked Questions
Q: How many marks does this chapter carry in the exam?
A: Approximately 5-7 marks in the annual exam.
Q: What question types are commonly asked?
A: MCQs (1 mark), Very Short Answer (2 marks), Short Answer (3 marks), and Long Answer / Diagram (5 marks).
Q: Is this chapter important for competitive exams?
A: Yes, concepts from this chapter appear in NTSE, Olympiad, and other science competitions.