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Questions and Answers
What is the purpose of using a seed drill for sowing seeds?
What happens to the nutrients in the soil if the same field is used for continuous cultivation of crops without adding manure?
The soil becomes poor in nutrients.
The process of adding manure to the fields to replenish the soil with nutrients is called _______________________.
manuring
Soil supplies organic nutrients to the crop plants.
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Why are seeds of some plants first grown in a nursery?
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Manure and fertilizers are added to the soil to prevent the growth of plants.
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Match the following terms with their definitions:
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What is the benefit of using a seed drill for sowing seeds?
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The soil is never left _______________________ in areas where crops are grown continuously.
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What is the result of improper or insufficient manuring?
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Study Notes
Soil Replenishment with Nitrogen
- Leguminous plants have Rhizobium bacteria in their roots, which fix atmospheric nitrogen.
- Farmers are encouraged to adopt this practice to replenish soil with nitrogen.
Fertilisers vs Manure
- Fertilisers are man-made inorganic salts prepared in factories, rich in plant nutrients like nitrogen, phosphorus, and potassium.
- Manure is a natural substance obtained from the decomposition of cattle dung and plant residues, prepared in fields.
- Manure provides humus to the soil, whereas fertilisers do not.
- Fertilisers are richer in plant nutrients than manure.
Advantages of Manure
- Manure is an organic substance obtained from the decomposition of plant or animal wastes.
- Microorganisms cause decomposition, and the resulting matter is used as organic manure.
- Manure is considered better than fertilisers for healthy crop growth.
Crop Growth and Management
- Suitable distance between seeds is necessary to avoid overcrowding and ensure healthy growth of plants.
- Seed drill is used for sowing seeds uniformly at equal distance and depth, saving time and labour.
Importance of Manuring
- Soil supplies mineral nutrients to crop plants, essential for their growth.
- Continuous cultivation of crops makes the soil poor in nutrients.
- Manuring replenishes the soil with nutrients, ensuring healthy crop growth.
- Improper or insufficient manuring results in weak plants.
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Description
Learn about the different ways to replenish soil with nitrogen, including leguminous plants and Rhizobium bacteria, and understand the differences between fertilisers and manure.
