Question

disadvanrage of fertilizer over manure.​

Answer 1

Answer:

Disadvantages of Fertilizers over Manures

The excessive use of nitrogenous fertilizers concentrates nitrates in the soil and water. ...

Excessive use of fertilizers over a long period may affect the alkalinity or acidity of the soil and may adversely affect the crop production.

Explanation:

Answer 2

Answer:

Disadvantages of fertilizer over manure:-

Chemical fertilizers when used in proper amounts promote the growth of plants and boost the crop yield. However, the excessive use of fertilizers has many serious disadvantages. Some of these are discussed below:

1. Chemical fertilizers when used in proper amounts promote the growth of plants and boost the crop yield. However, the excessive use of fertilizers has many serious disadvantages. Some of these are discussed below:The excessive use of nitrogenous fertilizers concentrates nitrates in the soil and water. Nitrate rich water is unfit for drinking, and is rather difficult to treat. When nitrate rich water is carried off into surface water bodies such as ponds, rivers and lakes it proliferates (accelerates) the growth of alga. These algae consume dissolved oxygen from water and thus deplete the water of its oxygen content leading to the death of useful aquatic life such as fish. Such an increase in the growth of algae in the lakes, ponds etc. resulting in the reduction of oxygen content in water is called EUTROPHICATION. Eutrophication thus destroys the life supporting environment in lakes and ponds.
2. Excessive use of fertilizers over a long period may affect the alkalinity or acidity of the soil and may adversely affect the crop production.