Soil Science - Study Mode

[#926] To apply NPK, an NP complex has to be supplemented with
Correct Answer

(B) Potash

Explanation

Solution: To apply NPK, an NP complex has to be supplemented with Potash ( Potassium-K ). NPK is a complex fertilizer consisting of Nitrogen, Phosphorus and Potassium. Each of these fundamental nutrients plays a key role in plant nutrition. Plant cells use these nutrients to grow and develop. They help root and shoot development, flower and fruit formation and assist natural pest and disease resistance.

[#927] Who developed method for estimation of lime requirement
Correct Answer

(B) Shoemaker et. al (1961)

Explanation

Solution: The lime requirement is defined as the amount of agricultural limestone or other basic. Material needed to increase the pH of the soil from an unacceptability acidic condition to a value that is considered optimum for the desired use of the soil. Estimation of the lime requirement was developed by Shoemaker et. al (1961) . Of the several buffer methods for measuring lime requirement of acid soils and is the most widely adopted by soil testing laboratories.

[#928] The extractant used for available phosphorus in soils is
Correct Answer

(B) 0.5 M NaHCO 3

Explanation

Solution: The extractant used for available phosphorus in soils is 0.5 M NaHCO 3 , (Olsen) . It is the most widely used method in P extraction for Routine fertility purposes, although it was initially proposed for neutral and alkaline soils. An extractant is a liquid used to remove a solute from a solution. Here, in Olsen method uses NaHCO 3 extractant that can remove Ca-Phosphates and phosphate absorbed on the surface of surfaces of calcium and magnesium carbonates along with Al-phosphates. Phosphorus is extracted from the soil with 0.5 M NaHCO 3 at a nearly constant pH of 8.5.

[#929] Soil test-based doze is better because is
Correct Answer

(A) Made for a particular field

Explanation

Solution: Soil testing-based doze is better because it is made for a particular field. Soil test refers to one or more of a wide variety of soil analyses conducted to estimate the plant available concentrations of plant nutrients, to determine fertilizer recommendations in agriculture. Soil testing helps in selecting the right fertilizer and its quantity for an optimum dose of fertigation.

[#930] Soils have no diagnostic pedogenic horizons are included in soil order
Correct Answer

(D) Entisols

Explanation

Solution: Soils have no diagnostic Pedogenic horizons included in soil order Entisols . Entisols are defined as soils that do not show any profile development other than an A horizon. An entisol has no diagnostic horizons and is most basically unaltered from its parent material, which can be unconsolidated sediment or rock. Entisols are the most abundant soil order. Occupying about 16% of the global ice-free land area.