3. How are living organisms Important for Improving soll fertility?
4. Which soll horizon is rich in humus? How is clayey soll useful for cro
Answers
Answer:
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Explanation:
3] One of the most important roles of soil organisms is breaking up the complex substances in decaying plants and animals so that they can be used again by living plants. This involves soil organisms as catalysts in a number of natural cycles, among the most prominent being the carbon, nitrogen, and sulfur cycles.
4] The A horizon is the top layer of the mineral soil horizons, often referred to as 'topsoil'. This layer contains dark decomposed organic matter, which is called "humus".
5] Clayey soil has very small sized particles. These particles are packed tightly and therefore can retain water. Clayey soil is also rich in organic matter. For growing crops such as wheat, gram, and paddy, the soil should be good at retaining water and rich in organic matter is suitable.