Soil Science - Study Mode
[#281] Which soil order have highest area in India
Correct Answer
(B) Inceptisols
Explanation
Solution: Inceptisols are the soil order that has the highest area in India. It is about 39% and most of the area of Uttar Pradesh is covered by inceptisols soil order. Followed by Entisols i.e. 24% and alfisols which is 13%. Inceptisols are soils of relatively new origin and are characterized by having only the weakest appearance of horizons, or layers produced by soil–forming factors.
[#282] For vermiculite, isomorphous substitution mainly occur at
Correct Answer
(A) Tetrahedral sheet
Explanation
Solution: Vermiculite is a type of clay consisting of two tetrahedral silicate layers coupled with one octahedral magnesium hydroxide-like layer. Vermiculite is a hydrous phyllosilicate mineral that undergoes significant expansion when heated. Vermiculite clays are weathered micas in which the potassium ions between the molecular sheets are replaced by magnesium and iron ions .
Isomorphic substitution is the process of replacing one structural cation for another of similar size. It only occurs between the cations of similar ionic radii. In vermiculite, isomorphous substitution mainly occurs at the Tetrahedral sheet.
[#283] Which of the following is correct
Correct Answer
(A) P 2 O 5 × 0.44 = P
[#284] A sandy soil needs frequent irrigation because of
Correct Answer
(B) Low water holding capacity
Explanation
Solution: Sandy soil needs frequent irrigation because of the low water holding capacity of sandy soil. Water flows down as well as evaporates very quickly from the sandy soil which makes it dry soon. Sandy soil is light, warm and dry and tends to be acidic and low in nutrients as it cannot hold water with it like other clay mixed soils.
[#285] Which one of the following will perform very poor as a source of N fertilizer under waterlogged rice field
Correct Answer
(A) Ammonium nitrate
Explanation
Solution: Ammonium nitrate will perform very poorly as a source of N fertilizer under a water-logged rice field. Ammonium nitrate is a popular fertilizer with 34% of nitrogen. The most suitable Nitrogenous fertilizer for submerged Rice fields is ammonium sulphate. It has 21% of N content.