INDIAN GEOGRAPHY

Detailed explanation-1: -We plant seeds for plants to grow in the topsoil. It is the topmost layer of soil. Plants get minerals and organic matter or humus required for their growth from this layer.

Detailed explanation-2: -The layers of the soil are called horizons. The uppermost horizon is called the topsoil layer. The topsoil layer is a mixture of sand, silt, clay and broken down organic matter, called humus. Humus is rich, highly decomposed organic matter mostly made from dead plants, crunched-up leaves, dead insects and twigs.

Detailed explanation-3: -It has the right water holding capacity for the growth of plants as it has almost equal proportion of fine particles and the large particles. It contains a balance of all three soil materials–silt, sand and clay–plus humus. It has a higher pH and calcium levels because of its high organic matter content.

Detailed explanation-4: -Topsoil is the upper layer of soil. It has the highest concentration of organic matter and microorganisms and is where most of the Earth’s biological soil activity occurs.