Crop Production and Management — Question 5
Back to all questionsQuestion 5
Explain how fertilisers are different from manure.
| Fertilisers | Manure |
|---|---|
| Fertiliser is a man-made inorganic salt. | Manure is a natural substance obtained by the decomposition of cattle dung and plant residues. |
| Fertiliser is prepared in factories. | Manure can be prepared in the fields. |
| Fertiliser does not provide any humus to the soil. | Manure provides a lot of humus to the soil. |
| Fertilisers are very rich in plant nutrients like nitrogen, phosphorus and potassium. | Manure is relatively less rich in plant nutrients. |
| Fertilisers are not good for soil as they degrade the soil in long run. | Manures improve the soil texture. |
| They cause water pollution. | They do not cause water pollution. |
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.