Answer:
Effect of the use of manure in maintaining soil quality
(i) Manures provide a lot of organic matter (humus) to the soil. Humus helps to restore water retention capacity of sandy soil and drainage in clayey soil.
(ii) These are the sources of soil organisms like soil friendly bacteria.
Effect of fertilisers on soil quality
(i) Use of excess fertilisers leads to dryness of soil and the rate of soil erosion increases.
(ii) Due to continuous use of fertilisers, the organic matter decreases which reduces porosity of the soil and the plant roots do not get sufficient oxygen.
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