Soil Science - Study Mode

[#491] Kisan khad (CAN) contains
Correct Answer

(B) 25 - 28% N

Explanation

Solution: CAN is the Calcium Ammonium Nitrate, also known as Kisan Khad . It contains around 8% calcium and 25% - 28% of Nitrogen. Mostly preferred for use on acidic soil, as the calcium present in it prevents the development of acidity in the soil.

[#492] An NPK complex can be used if the dose asks for
Correct Answer

(B) NPK

Explanation

Solution: NPK complex is a solid three nutrient fertilizer in a single granule that is produced via chemical or physical processes but excluding bulk blends. And normal NPK is a complex fertilizer that contains all three major nutrients 10% Nitrogen, 26% Phosphorous and 26% Potash. As both are the same, thus, NPK complex can be used if NPK dose is required.

[#493] The bulk density of a soil with portion density of 2.65 g/cc and pore space 40% would be
Correct Answer

(C) 1.59 g/cc

Explanation

Solution: Bulk density is an indicator of soil compaction. It is calculated as the dry weight of soil divided by its volume. It is expressed in grams per cubic centimeter. Portion density = 2.65 g/cc Pore space = 40% Putting on the formula. $$eqalign{
& { ext{Pore space }}\% = 100 - left( {frac{{{ ext{bulk density}}}}{{{ ext{portion density}}}}}
ight) imes 100 cr
& 40 = 100 - left( {frac{{{ ext{B}}{ ext{.D}}}}{{2.65}}}
ight) imes 100 cr} $$ Solving this, Bulk density = 1.59 g/cc

[#494] 'Mull Humas' is specifically associated with which organism?
Correct Answer

(C) Earth worm

Explanation

Solution: Mull humus is the humus with a granular layer known as mull, which is a porous mixture of organic material and mineral soil. Mull humus is characteristic of hardwood forests, deciduous forests or grasslands in warm and humid climates. Mull humus is specifically associated with Earth worm.

[#495] Match the following columns: Column I (Chemical) Column II (Use) a. Sodic soil 1. lllite b. Herbicide 2. N-serve c. Fruit ripening 3. 2, 4-D d. Nitrogen fixing inhibitor 4. Ethalene
Correct Answer

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

Explanation

Solution: Sodic soil means the soil is rich in sodium ions, sodium salts are leached through the soil and some sodium remains bound to clay particles and illite is the group of closely related non-expanding clay minerals. 2, 4-D is the Herbicide that controls broadleaf weeds. Ethylene in gaseous form is used to initiate the ripening process in the fruits, which can be referred to as artificial ripening. N and -serve is a nitrogen stabilizer and it inhibits nitrification, which helps to optimize the yield and profit potential of corn and wheat.