Soil Science - Study Mode

[#266] Ammonium sulphate contains
Correct Answer

(A) 20.6% N

Explanation

Solution: Ammonium sulphate is a quick-acting acidic fertilizer used usually for alkaline soils. It is used as slow releasing nitrogenous fertilizer and a rich source of Sulphur nutrients also. It contains 20.6% Nitrogen and 24% Sulphur. It is also used as an agricultural spray adjuvant for water-soluble insecticides, herbicides and fungicides.

[#267] From Q/I relationship described by Beckett (1964), a high PBC K indicates that
Correct Answer

(C) Availability of potassium in the soil is excellent

Explanation

Solution: From the Q/I relationship described by Beckett in 1964, a high PBCK indicates that the availability of potassium in the soil is excellent. The Q/I relations of labile soil K relate its availability or intensity (I) to the amount (Q) present. Values of labile K+ indicated a greater K+ released into the soil solution, resulting from a larger pool of soil K+. a high value of the potential buffering capacity for K+ (PBC K ) in the soil is indicative of a good K+.

[#268] Soils with high pH are generally deficient in
Correct Answer

(A) Zn and Mn

Explanation

Solution: Soils with high pH are alkaline soils and are generally deficient in Zinc and Manganese. These types of soil have high amounts of calcium, sodium and magnesium. The concentration of Hydrogen ions ranges from zero to 14 on the pH scale, soil with a pH level below seven is acidic soil whereas the soil with a pH level above seven indicates alkaline soil.

[#269] Soil moisture regime dominant in India is
Correct Answer

(A) Ustic

Explanation

Solution: The soil moisture regime dominant in India is Ustic . Ustic is a class of soil moisture regime. It is one of a range of different soil moisture regimes. The ustic moisture regime is intermediate between the aridic regime and the udic regime. The ustic moisture regime is common in semi-arid and sub-humid climates.

[#270] Boron deficiency in fodder crops can be seen when boron is
Correct Answer

(C) 1 - 2%

Explanation

Solution: Boron deficiency in fodder crops can be seen when boron is 1 - 2% in the soil. Boron deficiency can be identified by the symptoms like stunting and distortion of the growing tip that can lead to tip death, brittle foliage and yellowing of lower leaf tips.