Soil Science - Study Mode

[#356] Amount of free phosphoric acid in SSP in
Correct Answer

(C) 4%

Explanation

Solution: SSP is the most popular phosphatic fertilizer after Dap as it contains 3 major plant nutrients i.e. Phosphorus, Sulphur and Calcium along with traces of other micronutrients. Free phosphoric acid in both the SSP whether it is powdered or granulated is 4% maximum. Phosphoric acid yields more available phosphorus hence it can be directly used as a fertilizer.

[#357] Fertiliser P reacts in soil to form compounds with
Correct Answer

(C) Al, Fe, Ca

Explanation

Solution: Fertilizer P reacts in the soil to form compounds with Aluminium, Iron and Calcium. It forms water soluble phosphate ions and compounds reacting with these elements which can be readily absorbed by the plants for its use. Phosphorous is one of the essential nutrients of the plants and it shares a major portion in all widely used fertilizers like NPK, DAP, MAP, TSP, etc.

[#358] Fibrous clay is
Correct Answer

(D) Attapulgite

Explanation

Solution: Attapulgite also known as palygorskite is a fibrous clay with a chemical composition of magnesium aluminum phyllosilicate. It is one of the types of fuller's earth. Attapulgite is widely used in medicines. It binds to acids and toxic substances in the stomach and digestive tracts when taken orally.

[#359] In DTA (Differential Thermal Analysis), which are used as inert material?
Correct Answer

(D) All of the above

Explanation

Solution: DTA is Differential thermal analysis and is a thermoanalytical technique similar to differential scanning calorimetry. It consists of an inert environment with inert gases which will not react with sample and reference. Al 2 O 3 , Silica and Charcoal, all are used as inert materials.

[#360] Match the following columns: Column I (OM) Column II (N Content %) a. Compost 1. 0.50 b. FYM 2. 0.89 c. Night soil 3. 5.50 d. Bird guano 4. 7-8
Correct Answer

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

Explanation

Solution: The compost contains 0.89% of nitrogen. FYM is farmyard manure and its nitrogen content is 0.50%. Night soil is nothing but human excreta which is used as fertilizer and it contains 5.5% of nitrogen approximately. Bird Guano is the accumulated excrement of seabirds and bats, and is a highly effective fertilizer, it contains
7% - 8% of Nitrogen.