Soil Science - Study Mode

[#766] Final C/N of Compost is nearly
Correct Answer

(D) 25 : 1

Explanation

Solution: Carbon to Nitrogen Ratio is a ratio of the mass of carbon to the mass of nitrogen in a substance. Carbon and nitrogen are the most important elements required for microbial decomposition of organic matter to produce compost. When composting is under process the C/N ratio is higher but the final C/N ratio noted is about 25:1.

[#767] For nitrification, the optimum pH is
Correct Answer

(C) 8.5

Explanation

Solution: Nitrification is the microbial process by which reduced nitrogen compounds are sequentially oxidized to nitrite and nitrate. The bacteria involved in the process of nitrification are very sensitive to pH. The pH should be between 7.0 - 8.0 for Nitrosomonas, and the optimum pH range for Nitrobacter is approximately 7.5 - 8.5. Therefore as per the given options, the optimum pH for the nitrification process is 8.5.

[#768] A soil having pH of 8 is
Correct Answer

(C) Alkaline

Explanation

Solution: As we know a pH level above 7 is basic and referred to as the alkalinity of any substance. Likewise, A soil having pH of 8 is also referred to as alkaline soil. Alkaline soil is a type of soil with high amounts of calcium, sodium and magnesium. A variety of perennials, shrubs, trees and vines like lilac, daphnes and elms have adapted to tolerate higher alkaline levels.

[#769] L-value is lowest for soil of which region?
Correct Answer

(A) Arid

Explanation

Solution: L-value is the amount of phosphorus in the soil and in the soil solution which is exchangeable with added orthophosphate to the soil as measured by a plant growing in the system. L-value is lowest for Arid region soil.

[#770] Primary minerals are having diameter
Correct Answer

(D) Both B and C

Explanation

Solution: The primary mineral is the mineral that is formed during the original crystallization of the host igneous primary rock and includes the essential mineral used to classify the rock along with any accessory minerals. Primary minerals can be used to analyze geochemical dispersion halos and indicator minerals. The diameter of primary minerals are having a diameter greater than 2 μm (0.002 mm), which includes silt, sand and gravel.