Soil Science - Study Mode
[#211] For consideration of Argillic endopedon, how many times of clay content need to have than overlying horizon?
Correct Answer
(B) 1.2
Explanation
Solution: Endepedon is a diagnostic horizon characterized by the accumulation of aluminum and organic matter with or without iron. And Argillic is the mineral soil horizon that is characterized by the illuvial accumulation of layer-lattice silicate clays. For consideration of Argillic endopedon, 1.2 times of clay content need to have than the overlying horizon.
[#212] Size of colloidal clay particle is less than
Correct Answer
(C) 0.002 mm
Explanation
Solution: A colloid is a glue-like organic or inorganic matter with too little particle size but a large surface area per unit mass or volume. The size of the clay particles is the smallest. It is less than 0.002 mm in diameter. Moreover, the size of sand is 2.0 to 0.05 mm and Silt is 0.05 to 0.002 mm.
[#213] In Ammonium Nitrate % of Ammonium and Nitate are
Correct Answer
(B) 50% & 50%
Explanation
Solution: Ammonium nitrate is a chemical compound with the chemical formula NH 4 NO 3 . It is a white crystalline solid consisting of ions of ammonium and nitrate. Both of them i.e. ammonium cation and nitrate anion are in 50% - 50%. It is highly soluble in water and hygroscopic as a solid, although it does not form hydrates. It is predominantly used in agriculture as a high nitrogen fertilizer.
[#214] Sulpher, Rock phosphate & Thiobacillus combined to form
Correct Answer
(B) Biosuper
Explanation
Solution: Phosphate rock combined with finely-divided, elemental Sulphur and Thiobacillus is combined to form a fertilizer “Biosuper” . Biosuper is effective on soils of both low and medium phosphorus status, and also on soils differing in P retention capacity. Thiobacillus present in Biosuper oxidizes Sulphur, producing sulphates useful to plants.
[#215] No. of benchmark soil in India is
Correct Answer
(D) 64
Explanation
Solution: A benchmark soil is one of a large extent within one or more major land resource areas that holds a key position in the soil classification system. A benchmark soil is a reference point that is adequately characterized in terms of its properties and environmental conditions. 64 benchmark soils have been identified in the different major land resource areas of Kerala for which soil monoliths were collected. The basic objective of this soil is to focus attention on extensively occurring soils and their agronomic concepts for wider acceptability of interpretations and extrapolations of research data.