🌿 Chapter: Improvement in Food Resources
🌱 1. Improvement in Crop Yields
✅ Key Definition
Improvement in crop yields means increasing the production of crops per unit area by using scientific methods and improved agricultural practices.
🌱 Three Main Approaches
- Crop Variety Improvement
- Crop Production Management
- Crop Protection Management
📚 A. Crop Variety Improvement
✅ Key Definition
The development of new crop varieties with desirable characteristics to increase productivity.
🌱 Desirable Traits in New Varieties
- Higher yield
- Improved quality (protein content in pulses, oil content in oilseeds)
- Biotic resistance (against pests and diseases)
- Abiotic resistance (against drought, salinity, heat, flood)
- Short maturity duration
- Wider adaptability
🌱 Hybridisation
✅ Key Definition
Crossing between genetically dissimilar plants to produce a new variety.
📚 Types:
- Intervarietal (between varieties)
- Interspecific (between species)
- Intergeneric (between genera)
🧠 Exam Tip: Hybridisation is a frequently asked 2-mark question.
📊 Types of Crops (Based on Season)
| Crop Type | Season | Examples |
|---|---|---|
| Kharif | Rainy (June–Oct) | Rice, Maize, Cotton |
| Rabi | Winter (Oct–March) | Wheat, Gram, Mustard |
🧠 Memory Trick:
“Kha-Rain, Ra-Winter”
📚 B. Crop Production Management
✅ Key Definition
Agricultural practices used to improve crop yield.
🌱 1️⃣ Nutrient Management
Plants require nutrients for growth.
📊 Essential Nutrients (NCERT)
| Macronutrients | Micronutrients |
|---|---|
| Nitrogen | Iron |
| Phosphorus | Manganese |
| Potassium | Zinc |
| Calcium | Copper |
| Magnesium | Boron |
| Sulphur | |
| Carbon | |
| Hydrogen | |
| Oxygen |
🌱 Sources of Nutrients
1️⃣ Manure
- Organic
- Improves soil texture
- Increases water holding capacity
2️⃣ Fertilizers
- Inorganic
- Rich in specific nutrients
- Act quickly
📊 Manure vs Fertilizer (Very Important for Exams)
| Manure | Fertilizer |
|---|---|
| Organic | Inorganic |
| Low nutrient content | High nutrient content |
| Improves soil structure | Does not improve soil structure |
| Environment friendly | Excess use harms soil |
🌱 2️⃣ Irrigation
✅ Key Definition
The artificial supply of water to crops at regular intervals.
🌱 Traditional Methods
- Moat (Pulley system)
- Dhekli
- Rahat
- Chain pump
🌱 Modern Methods
- Sprinkler system
- Drip system
🧠 Why Modern Methods?
- Save water
- Suitable for uneven land
- Prevent waterlogging
🌱 3️⃣ Cropping Patterns
1️⃣ Mixed Cropping
Growing two or more crops simultaneously on the same field.
2️⃣ Intercropping
Growing two or more crops in a definite row pattern.
3️⃣ Crop Rotation
Growing different crops on the same land in a planned sequence.
📊 Mixed Cropping vs Intercropping
| Mixed Cropping | Intercropping |
|---|---|
| No fixed row pattern | Definite row pattern |
| Reduces risk of failure | Efficient use of nutrients |
| Example: Wheat + Gram | Example: Soybean + Maize |
🧠 Important Point:
Leguminous crops fix nitrogen in soil → Improve soil fertility.
📚 C. Crop Protection Management
✅ Key Definition
Protection of crops from weeds, pests, and diseases to prevent loss of yield.
🌱 Weeds
Unwanted plants growing with crops.
🔹 Removed by:
- Hand weeding
- Hoeing
- Weedicides (2,4-D)
🌱 Pests
Insects that damage crops by:
- Cutting roots
- Boring stems
- Sucking cell sap
🌱 Diseases
Caused by:
- Bacteria
- Fungi
- Viruses
🌱 Storage of Grains
Grains must be:
- Properly dried
- Stored in clean, dry places
Storage Structures
- Granaries
- Silos
🌿 2. Improvement in Food from Animals
This branch is called Animal Husbandry.
📚 A. Cattle Farming
✅ Key Definition
Rearing of cattle for milk and draught purposes.
🌱 Types of Cattle
| Type | Use |
|---|---|
| Milch animals | Milk production |
| Draught animals | Agricultural work |
🌱 Important Practices
- Proper feeding
- Clean shelter
- Vaccination
- Cross-breeding
📚 B. Poultry Farming
Rearing of fowls for eggs and meat.
🌱 Types
- Layers → Egg production
- Broilers → Meat production
🔹 Broilers require protein-rich feed.
📚 C. Fish Production
🌱 Types of Fisheries
| Type | Source |
|---|---|
| Marine fisheries | Sea |
| Inland fisheries | Rivers, lakes, ponds |
🌱 Composite Fish Culture
Different fish species grown together.
Example (NCERT):
- Rohu
- Catla
- Mrigal
- Grass carp
- Silver carp
🧠 Benefit: They occupy different levels of pond → No competition for food.
📚 D. Bee-Keeping (Apiculture)
Rearing of honeybees for honey and wax.
🌱 Important Points
- Requires flowering plants
- Honey is nutritious
- Bees increase crop yield by pollination
🖊 Important Diagrams (How to Draw)
1️⃣ Sprinkler irrigation – Show pump, pipe, rotating sprinkler
2️⃣ Drip irrigation – Show pipes along rows, water droplets at roots
3️⃣ Beehive – Rectangular box, frames, honeycomb
🌟 Quick Revision Summary
🔥 Three main methods to increase crop production:
- Crop variety improvement
- Crop production management
- Crop protection management
🔥 Nutrient sources: Manure and Fertilizers
🔥 Cropping patterns: Mixed cropping, Intercropping, Crop rotation
🔥 Irrigation: Traditional and Modern methods
🔥 Crop protection: Weeds, pests, diseases
🔥 Animal husbandry includes cattle, poultry, fisheries, bee-keeping
🧠 Scoring Strategy for Exams
✔ Learn all tables (3-mark questions)
✔ Practice differences (2-mark questions)
✔ Revise hybridisation and cropping patterns carefully
✔ Diagrams can fetch easy marks
