Soil Science - Study Mode

[#786] Match the following columns: Column I (Fertilisers) Column II (N Content %) a. Anhydrous ammonia 1. 16 b. Ammonium phosphate 2. 82 c. Di-ammonium phosphate 3. 18 - 21 d. Ammonium chloride 4. 25
Correct Answer

(A) a-2, b-1, c-3, d-4

Explanation

Solution: Ammonium ammonia is an efficient and widely used source of nitrogen fertilizer. It is relatively easy to apply and is readily available to producers. It has the highest content of Nitrogen which is about 82%. Ammonium phosphate is a widely used source of phosphorus and nitrogen. It’s made of two constituents common in the fertilizer industry and contains the most phosphorus of any common solid fertilizer. Nitrogen content is 16%. Di-ammonium phosphate is the most widely used Phosphorous fertilizer. But it also contains nitrogen and its N content is 18 - 21%. Ammonium chloride is medium-strength nitrogen fertilizer. It contains about 25% nitrogen.

[#787] Sub surface drainage is required for following crop
Correct Answer

(B) Tea

Explanation

Solution: Subsurface drainage is the removal of water from the root zone. It is accomplished by deep open drains or buried pipe drains. Subsurface drainage lowers the water table and removes excess water through open ditches or perforated pipes. Subsurface drainage is required for the following crop Tea.

[#788] The negative charge on 2 : 1 clays is
Correct Answer

(C) Both A and B

Explanation

Solution: The negative charge on 2 : 1 Clays is both pH-dependent and pH-independent. A 2 : 1 clay consists of an octahedral sheet sandwiched between two tetrahedral sheets and 2 : 1 layers have a net negative charge and may be bonded together either by individual cations or by positively charged octahedral sheets. Some examples are talc, vermiculite and montmorillonite.

[#789] Presence of cambic horizon is a feature of
Correct Answer

(B) Inceptisol

Explanation

Solution: Cambic horizons are subsurface soil layers of pedogenic change without appreciable illuviated material. It always has less carbonate than an underlying horizon with calcium carbonate accumulation. The presence of a cambic horizon is a feature of Inceptisol . Inceptisol is a soil order formed quickly through alteration of the parent material. They have an ochric or umbric horizon and a cambic subsurface horizon.

[#790] The mineralisation of organic phosphorus has been studied in relation to . . . . . . . . ratio.
Correct Answer

(C) C/N/P

Explanation

Solution: The mineralization of organic phosphorus has been studied in the C/N/P ratio. Mineralization is the process by which chemicals present in organic matter are decomposed or oxidized into easily available forms to plants. When the agent or animal dies, it decays and the organic phosphate is returned to the soil. within the soil, organic forms of phosphate can be made available to plants by bacteria that break down organic matter into inorganic forms of phosphorus.