9 BS Chapter 3 upto agriculture Revision Notes

CLICK ABOVE TITLE TO OPEN. Posted on

 

🌾 Class 9 – Chapter : Improvement in Food Resources

9 BS Chapter 3 upto agriculture


1️⃣ Need for Improvement in Food Resources

🔹 Why Improvement is Necessary?

  • India has a large and growing population

  • Limited cultivable land

  • Need to increase production efficiency

🔹 Revolutions in Agriculture

  • Green Revolution → Increased food grain production

  • White Revolution → Increased milk production

🔹 Sustainable Practices Needed

  • Avoid environmental damage

  • Maintain ecological balance

  • Ensure food security (availability + access)

2️⃣ Types of Crops and Nutrients

🌾 Food Crops

Crop TypeExamples    Nutrients Provided
Cereals    Wheat, Rice, Maize    Carbohydrates
Pulses        Gram, Pea, Moong    Proteins
Oil seeds    Soyabean, Mustard    Fats
Fruits & Vegetables    Various    Vitamins & Minerals
Fodder crops    Berseem, Oats    Animal feed

3️⃣ Crop Seasons

🌧️ Kharif Crops (June–October)

  • Paddy

  • Soyabean

  • Maize

  • Cotton

  • Green gram

❄️ Rabi Crops (November–April)

  • Wheat

  • Gram

  • Mustard

  • Linseed

4️⃣ Steps to Improve Crop Yield

Three major stages:

  1. Selection of seeds

  2. Nurturing of crop

  3. Protection of crop

🔹 Three Main Strategies

  • Crop variety improvement

  • Crop production management

  • Crop protection management

5️⃣ Crop Variety Improvement

🔹 Objectives

  • Higher yield

  • Disease resistance

  • Better quality

  • Fertilizer response

🔹 Hybridization

  • Crossing genetically different plants

  • Types:

    • Intervarietal

    • Interspecific

    • Intergeneric

🔹 Genetically Modified Crops

  • Desired gene introduced

  • Improved characteristics

6️⃣ Crop Production Management

Based on farmer’s financial capacity:

  • No-cost production

  • Low-cost production

  • High-cost production

7️⃣ Nutrient Management

Plants need nutrients from:

SourceNutrients
AirCarbon, Oxygen
WaterHydrogen
Soil13 essential nutrients

🔹 Macronutrients

  • Nitrogen

  • Phosphorus

  • Potassium

  • Calcium

  • Magnesium

  • Sulphur

🔹 Micronutrients

  • Iron

  • Zinc

  • Boron

  • Copper

  • Manganese

  • Molybdenum

  • Chlorine

8️⃣ Manures and Fertilizers

🌿 Manure

  • Organic matter

  • Improves soil fertility

  • Improves soil structure

  • Increases water holding capacity

Types:

  • Compost

  • Vermicompost

  • Green manure

🧪 Fertilizers

  • Commercial nutrients

  • Supply NPK (Nitrogen, Phosphorus, Potassium)

  • Give quick results

⚠ Overuse leads to:

  • Soil fertility loss

  • Water pollution

  • Harm to microorganisms

9️⃣ Irrigation

Most Indian agriculture is rain-fed.

🔹 Sources:

  • Wells (Dug wells, Tube wells)

  • Canals

  • River lift systems

  • Tanks

🔹 Modern Methods:

  • Rainwater harvesting

  • Watershed management

  • Check dams

🔟 Cropping Patterns

🌾 Mixed Cropping

  • Two or more crops grown together

  • Reduces risk

🌱 Intercropping

  • Two crops grown in definite row pattern

  • Better nutrient utilization

  • Pest control

🔄 Crop Rotation

  • Different crops grown in sequence

  • Maintains soil fertility

1️⃣1️⃣ Crop Protection Management

🔹 Weeds

  • Unwanted plants

  • Compete for nutrients

  • Example: Xanthium, Parthenium

🔹 Pests

  • Cut roots & leaves

  • Suck sap

  • Bore into stem/fruits

🔹 Diseases

  • Caused by bacteria, fungi, viruses

Control Methods:

  • Pesticides (herbicides, insecticides, fungicides)

  • Mechanical removal

  • Crop rotation

  • Resistant varieties

1️⃣2️⃣ Storage of Grains

Causes of Loss:

  • Insects

  • Rodents

  • Fungi

  • Improper moisture

Prevention:

  • Proper drying

  • Cleaning

  • Chemical fumigation