Soil Science - Study Mode
[#681] Ammonium Sulfate is
Correct Answer
(A) Single
Explanation
Solution: Ammonium Sulphate is an inorganic salt and a single-type fertilizer with several commercial uses. The most common use is as a soil fertilizer. It contains 21% nitrogen and 24% Sulphur. The primary use of ammonium is as a fertilizer for alkaline soils. In the soil the ammonium ion is released and forms a small amount of acid, lowering the pH balance of the soil, while contributing essential nitrogen for plant growth.
[#682] In submerged soil availability of phosphorus
Correct Answer
(A) Increases
Explanation
Solution: In submerged soil, the availability of phosphorus increases. On submergence, the availability of native as well as applied phosphorus increases in the soil. The phosphorus transformation is also known to be associated with pH changes in submerged soils. Soil available P is the fraction of total P in soil that is readily available for absorption by plant roots.
[#683] Which plant element accounts for at least one half of the total number of ions absorbed
Correct Answer
(A) N
Explanation
Solution: Nitrogen is the plant element that accounts for at least one-half of the total number of ions absorbed.
Nitrogen is absorbed by plants in the form of nitrate, and ammonium ions. And the other ions absorbed by plants are phosphate and potassium ions.
[#684] Potassium sulphate has chemical composition
Correct Answer
(B) K 2 SO 4
Explanation
Solution: Potassium sulphate has a chemical composition of K 2 SO 4 ., and its molecular weight is 174.26. A water-soluble fertilizer with high potassium and sulphate content along with an optimal amount of sodium. It helps in protein synthesis and enzyme function requirements. This combination of potassium and Sulphur ensures strong flower and fruit development.
[#685] Walkley and Black's method of organic matter determination allows percent recovery.
Correct Answer
(D) 74
Explanation
Solution: Walkley and Black 's method quantifies the amount of oxidizable organic matter in which organic matter is oxidized with a known amount of chromate in the presence of sulphuric acid. This method claims to estimate organic carbon and determine the overall organic matter and the percent recovery is about 74%.