1.

Compare the use of manures and fertilisers in maintaining the fertility of soil.

Answer»

Effects of using manures on soil quality:

  • Manures enrich the soil with nutrients and provide a lot of organic matter (humus) to the soil and thus restores water retention capacity of sandy soils and drainage capacity in clayey soil.
  • The addition of manures reduces the chances of soil erosion.
  • They provide food for the soil organisms, like soil friendly bacteria.

Effects of using fertilisers on soil quality:

  • By continuous use of fertilisers, soil can become powdery, dry and the chances of soil erosion increases.
  • By the use of fertilisers, the organic matter decreases which further decreases the porosity of soil and plant roots planted in the soil do not get oxygen properly.
  • The nature of soil turns to acidic or basic unnecessarily and it can harm the soil organisms.


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