Soil Science - Study Mode

[#746] Father of Soil Taxonomy is
Correct Answer

(B) G. D. Smith

Explanation

Solution: USDA soil taxonomy is developed by the United States Department of Agriculture and the National Cooperative Soil Survey provides an elaborate classification of soil types according to several parameters and in several levels: Order, Suborder, Great Group, Subgroup, Family and Series. This classification was originally developed by Guy Donald Smith, hence also known as the father of Soil Taxonomy.

[#747] Fertiliser use is profitable if each rupee spent on fertiliser produces crop worth at least
Correct Answer

(D) Rs. 2

Explanation

Solution: Fertilizer use is profitable if each rupee is spent on a fertilizer crop worth at least Rs. 2. Using survey results, rough calculations suggest agricultural household's spend on fertilizer or manure would be in the range of Rs. 78,000 - Rs. 1,20,000 crore in a cropping year. Adding the fertilizer subsidy bill, this amount will be around 1.7% of India’s consumption expenditure.

[#748] The carbon dioxide percentage in the soil air is
Correct Answer

(B) 0.25

Explanation

Solution: The carbon dioxide percentage in the soil air is 0.25% . The soil air contains several gases including nitrogen, oxygen, carbon dioxide and water vapour. Soil air constantly moves from the soil pores into the atmosphere and from the atmosphere into the pore space. Soil air and atmospheric air differ in compositions.

[#749] Who considered the father of pedology
Correct Answer

(C) V. V. Dokuchaev

Explanation

Solution: Vasily V. Dokuchaev is known as the father of Pedology. He is also known as the founder of modern soil science. He introduced the idea that the geographical variations in soil type could be explained by other variables besides geological factors. He also developed the first soil classification. Pedology is defined as the science that studies the genesis, nature, distribution and use of the potentiality of soil resources.

[#750] Strength of DTPA extract used for micronutrient analysis is
Correct Answer

(C) 0.005M

Explanation

Solution: The strength of DTPA extract used for micronutrient analysis is 0.005M. DTPA (Diethylene triamine Penta acetate) micronutrient extraction method is a non-equilibrium extraction for estimating the potential soil availability of Zn, Cu, Mn and Fe. It has been used for cadmium, nickel and lead in soils. The soils are extracted for available cationic micronutrients using the AB-DTPA method developed by Soltanpour and Workman in one set and by DTPA extracting solution (0.005 M DTPA, 0.1 M triethanolamine, 0.01 M Cacl 2 ).