Soil Science - Study Mode
[#731] Which form of nitrogenlous fertiliser will be preferred for paddy and potato?
Correct Answer
(B) Ammonical
Explanation
Solution: An ammoniacal form of nitrogenous fertilizer will be preferred for paddy and potatoes. Nitrogen requirements of rice crops are met from both the soil and fertilizers. The main form of nitrogen taken up by rice roots is ammonium in flooded paddy soil. Potatoes can utilize nitrate, ammonium and urea nitrogen. Urea must be converted to ammonium inside the plant with the aid of urease.
[#732] Which earth worm species is most efficient for Vermiculture?
Correct Answer
(A) Eisenia Fetida
Explanation
Solution: Eisenia Fetida is the earthworm species that is most efficient for vermiculture. The common names of this earthworm are manure worm, red worm, wiggler worm, etc. red wigglers are reddish brown, have small rings around their body and have a yellowish tail. It is used for vermicomposting of both domestic and industrial waste. Vermicomposting septic systems have been used for decades and allow for decentralized on-site processing of black water using Eisenia fetida .
[#733] Which of the following fertiliser is not produced in India?
Correct Answer
(D) Murate of potash
Explanation
Solution: Muriate of potash (MOP) is the only fertilizer that is not produced in India. As India imports all of the potash we do not have any reserve of potash in India. India imports handle promotes and markets potash fertilizers in India. MOP (Muriate of Potash) is a red-white crystal, completely soluble in water and therefore readily available to the crops. It usually contains 60% K 2 O. It is the most common source of potash for farm use and is also the main potash ingredient for compound fertilizers containing potassium.
[#734] Relation of D e (diffusion coefficient) with moisture content (θ)
Correct Answer
(C) D e increase with increase in θ upto saturation
Explanation
Solution: The diffusion coefficient (D) is the amount of a particular substance that diffuses across a unit area in 1 s under the influence of a gradient of one unit. Moisture content is determined by subtracting the dry weight from the initial weight, and the moisture content is then calculated as the amount of water divided by the dry weight or total weight. The relation of D e (diffusion coefficient) with moisture content (θ) is that D e increase with the increase in θ up to saturation.
[#735] Among the following fertilizers which one having highest solubility in water?
Correct Answer
(C) Urea
Explanation
Solution: Among the given options, Urea is the nitrogenous fertilizer for the amide group. It contains nitrogen in amide form but this form of nitrogen is swiftly converted by soil microorganisms into ammonical form and then into nitrate form. Urea is a white crystalline solid containing 46% of nitrogen as an animal feed additive and fertilizer.