Question

_______ is the most suitable fertilizer for paddy.
A. Urea
B. Superphosphate
C. Ammonium sulphate
D. Potassium nitrate

Answer 1

Hint: The suitable fertilizer for paddy is the one which fulfils its nutrition needs of plants especially nitrogen and sulphur needs.

Complete step by step answer:
The most suitable fertilizer for paddy is Ammonium sulphate. Growers apply ammonium sulphate primarily where they need supplemental N (Nitrogen based) and S (Sulphur based) to meet the nutritional requirement of growing plants. Subsequently, ammonium sulphate contains only 21 percent N other fertilizer sources are more concentrated and economical to move which makes it a far better choice for N-deficient fields. However, ammonium sulphate provides an outstanding source of S, which supports or drives numerous essential plant functions including protein synthesis. As the N-fraction is present in the ammonium form of ammonium sulphate, rice farmers frequently apply it to flooded soils, since nitrate based fertilizers are a poor choice due to denitrification losses.

Ammonium sulphate has a chemical formula ${(N{H_4})_2}S{O_4}$ . It is an inorganic salt with various commercial uses. The most common use is as a soil fertilizer. In the soil the ammonium ion is released and forms a small amount of acid which lowers the pH balance of the soil which in turn contributes essential nitrogen for plant growth. It is also used as an agricultural spray adjuvant for water soluble insecticides, herbicides and fungicides. It binds iron and calcium cations that are present in both well water and plant cells. It is particularly effective as an adjuvant for glyphosate and glufosinate herbicides. Other uses of ammonium sulphate include treatment of water for drinking purpose in which it is used in combination with chlorine which generates monochloramine for disinfection. It is also used in the preparation of other ammonium salts, especially ammonium persulfate. It is also used as an ingredient for vaccines.

Note:
Ammonium sulphate has various applications but its main application is as a fertilizer. It fulfils the nutritional requirements of growing plants by supplying nitrogen and sulphur needs of the plants.