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NCERT Science Notes - Class 8
Chapter 1 - Crop Production and Management
Chapter - 1 : Crop Production and Management
Before sowing seeds, it is necessary to break soil clumps to get a better yield. This is done with the help of various tools. The main tools used for this purpose are the plough, hoe, and cultivator.
1. Plough:
2. Hoe:
3. Cultivator:
1. Importance of Sowing:
2. Selection of Seeds:
Activity 1.1: Why Some Seeds Float
3. Tools Used for Sowing:
Seed Drill
Boojho's Observation:
Importance of Appropriate Seed Spacing:
1. Definition:
Boojho's Observation:
Nutrient Depletion in Soil:
Manure:
Plant Growth Observation:
Manure vs. Fertilizers:
Impact of Fertilizer Use:
Crop Rotation:
Role of Rhizobium Bacteria:
S. No. |
Fertilizer |
Manure |
---|---|---|
1. | Fertilizer is a man-made inorganic salt. | Manure is a natural substance obtained from the decomposition of cattle dung and plant residues. |
2. | Fertilizer is prepared in factories. | Manure can be prepared in the fields. |
3. | Fertilizer does not provide any humus to the soil. | Manure provides a lot of humus to the soil. |
4. | Fertilizers are very rich in plant nutrients like nitrogen, phosphorus, and potassium. | Manure is relatively less rich in plant nutrients. |
Advantages of Manure over Fertilizers
1. Importance of Water:
1. Importance of Traditional Methods:
1. Definition:
Effects of Weedicides on Handlers
1. Definition:
1. Importance of Storage:
1. Storage Containers:
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