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Crop Production and Management - Sowing and Selection of Seeds

Grade 8CBSE

Review the key concepts, formulae, and examples before starting your quiz.

🔑Concepts

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Sowing is the process of planting seeds in the soil. It is considered the most important part of crop production.

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Selection of Seeds: Before sowing, good quality, clean, and healthy seeds of a high-yielding variety are selected. Farmers prefer seeds that give a high yield per unit area.

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Seed Quality Test: Damaged seeds become hollow and are thus lighter. When put in H2OH_{2}O, damaged seeds float while healthy, heavy seeds sink.

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Traditional Tools: Tools used traditionally for sowing seeds are shaped like a funnel. Seeds are filled into the funnel and passed down through two or three pipes having sharp ends that pierce the soil.

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Seed Drill: A modern tool used for sowing with the help of tractors. It sows the seeds uniformly at equal distance and depth.

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Advantages of Seed Drill: It ensures that seeds get covered by the soil after sowing, protecting them from being eaten by birds. It also saves time and labour\text{labour}.

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Prevention of Overcrowding: Proper spacing between seeds is necessary to avoid overcrowding of plants. This allows plants to get sufficient sunlight, nutrients, and H2OH_{2}O from the soil.

📐Formulae

Seed Quality∝1Buoyancy in H2O\text{Seed Quality} \propto \frac{1}{\text{Buoyancy in } H_{2}O}

Density of Healthy Seed>Density of H2O\text{Density of Healthy Seed} > \text{Density of } H_{2}O

Density of Damaged Seed<Density of H2O\text{Density of Damaged Seed} < \text{Density of } H_{2}O

💡Examples

Problem 1:

A farmer observes that some seeds float when soaked in H2OH_{2}O. Should he use these seeds for sowing? Justify.

Solution:

No, the farmer should not use the seeds that float.

Explanation:

Seeds that float are typically damaged or infected by pests, making them hollow from the inside. Since their density is less than the density of H2OH_{2}O, they float. These seeds lack the necessary nutrients and embryo health to germinate into healthy crops.

Problem 2:

Why is it essential to maintain an appropriate distance between seeds during the process of sowing?

Solution:

To prevent competition for resources.

Explanation:

If seeds are sown too close together, the resulting plants will compete for sunlight, H2OH_{2}O, and soil nutrients. This overcrowding leads to poor growth. Optimal spacing ensures each plant has access to the maximum available resources for a better yield.