Question

why must farmers work hard to conserve their topsoil

Answer 1

Due to today's condition soil erosion is common so it is a huge responsibility on farmers to conserve their fertile topsoil or their means of earning will be lost and wil also harm us.
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Answer 2

Answer:

Most farmers strive hard to protect the topsoil as it is the most fertile layer of the soil that contains all the essential nutrients required for the proper growth of the plants.

This topsoil also contains the humus, which is the organic component of soil formed by the decomposition of living matter. This is very important for the growth of plants as it helps in the retention of nutrients and water in the soil for the plant uptake.

Soil erosion is quite common and it takes away mainly the topsoil that hampers the growth of plants and thereby it needs to be protected.