Soil Science - Study Mode

[#551] The nutrient concentration range in which added nutrient will not increase yield but can increase nutrient concentration is referred as
Correct Answer

(C) Luxury consumption

Explanation

Solution: The nutrient concentration range in which added nutrients will not increase yield but can increase nutrient concentration is referred to as Luxury consumption. It is often used to describe nutrient absorption by the plant that does not influence yield. It occurs when soil nutrient levels are above optimum and plants take up more of a nutrient than needed for functioning and production.

[#552] Bray has modified the mitscherlich equation to
Correct Answer

(D) log (A - y) = log A - C 1 b - cx

Explanation

Solution: The equation introduced by Mitscherlich has been generally used to express nutrient-yield relationships as follows: $${x08f{y = A}}left( {{x08f{1 - }}{{x08f{e}}^{{x08f{ - eb - ex}}}}}
ight)$$ Bray has modified the mitscherlich equation to $${x08f{log}}left( {{x08f{A - y}}}
ight){x08f{ = logA - }}{{x08f{C}}_{x08f{1}}}{x08f{b - cx}}$$ Where A = % theoretical maximum yield, y = actual yield obtained in q ha -1 , b = native soil test value in kg ha -1 , x = fertilizer nutrient applied in kg ha -1 , c 1 and c = constants i.e., the efficiency of soil and fertilizer nutrients respectively.

[#553] A soil profile is a vertical section of soil having depth
Correct Answer

(D) 1.5 - 2.0 m

Explanation

Solution: A soil profile is a vertical section of soil, standard to a depth of 1.5 - 2.0 meters. Most soils have layers, parallel to the soil surface, called horizons. The horizons are the result of soil formation and geological processes. The soil profile is a cross-section of the soil that reveals its horizons (layers). Soil generally consists of visually and texturally distinct layers, which can be summarised from top to bottom as A, B, C, E and O horizons.

[#554] Urea-form contains N in % is
Correct Answer

(D) 40%

Explanation

Solution: This is the correct answer . Urea-form contains approximately 40% nitrogen (N). Urea-form is a type of nitrogen fertilizer commonly used in agriculture to supply plants with nitrogen, which is an essential nutrient for their growth and development. Therefore, the correct answer is Option D: 40% . Urea-form contains approximately 40% nitrogen.

[#555] In the case of Zn deficiency of paddy, how much zinc sulphate should be applied in one hectare of soil.
Correct Answer

(C) 25 kg

Explanation

Solution: In the case of Zn deficiency of paddy, around 25 kg of zinc sulphate should be applied in one hectare of soil or dip roots of rice seedlings in a 2 - 4% zinc sulphate suspension before planting to overcome the deficiency. Zinc is an essential plant nutrient required for several biochemical processes in the rice plant, including chlorophyll production and membrane integrity.