4. Which substance in the soil increases its water-holding capacity?5. Nameany twomicro and macro-organisms that are found in soil.6. How many layers or horizons are present in a soil profile?7. Write the three horizons of soil.8. State the uses of clayey soil.9. How many types of soil are found in our country?1, Which crops can be cultivated in black soil?

4. Which substance in the soil increases its water-holding capacity?5.

1.	4. Which substance in the soil increases its water-holding capacity?5. Nameany twomicro and macro-organisms that are found in soil.6. How many layers or horizons are present in a soil profile?7. Write the three horizons of soil.8. State the uses of clayey soil.9. How many types of soil are found in our country?1, Which crops can be cultivated in black soil?
Answer» <p>4. The water holding capacity for sand is low. Soilorganicmatter (SOM)is another factor that can help increase water holding capacity. Soilorganicmatter has anaturalmagnetism to water. If the farm increases the percentage of soilorganicmatter, the soil water holding capacity will increase.5. bacteria, fungi are micro organismarthropods and earthworm6. five soil horizons7. topsoil horizon, subsoil horizon, parent material8.Clay soilisusedfor moulding.Clayis Sticky when wet and hard when dry, these feature makes it a goodsoilfor moulding in ceramics industries(moulding plates, flower vases, cups etc). ...Clay soilalso support the growth of some plants,therefore; it isusedin agriculture to produce crops9. alluvial soil, red soil, black soil, desert soil, laterite soil and mountain soil10. Blacksoilis rich in calcium, potassium and magnesium but has poor nitrogen content.Cropslike cotton, tobacco, chilly, oil seeds, jowar, ragi and maize grow well in it.</p>