Soil Science - Study Mode
[#796] With increase in soil depth, CO 2 content . . . . . . . .
Correct Answer
(B) Increases
Explanation
Solution: With the increase in soil depth, CO 2 content Increases. Carbon dioxide content in soil is about 0.25% while carbon content in the atmosphere is only 0.04%. The soil can store more carbon when it is protected from microbial activity. Gases fill soil pores in the soil structure as water drains or is removed from a soil pore by evaporation or root absorption.
[#797] Total porosity of a soil with 1.325 g/cc and 2.65 g/cc PD is
Correct Answer
(C) 50%
Explanation
Solution: Soil porosity is the percent of total soil volume made up of pore space. The total porosity is the total void space and as such includes isolated pores and the space occupied by clay-bound water. $$eqalign{
& { ext{Total porosity}} = frac{{{ ext{volume of voids}}}}{{{ ext{total volume}}}} imes 100\% cr
& = frac{{1.325}}{{2.65}} imes 100\% cr
& = 50\% cr} $$
[#798] In complex 12-32-16 each granule has
Correct Answer
(A) All three nutrients
Explanation
Solution: In complex 12-32-16 each granule has all three nutrients i.e. Nitrogen, Phosphorus and Potassium. NPK 12-32-16 fixes the phosphorus and potassium content in the soil and is highly effective in soils with leaching conditions. It should be applied during sowing and through broadcasting. The dosage should be as per the crop and the soil.
[#799] Keys to Soil Taxonomy came in the year of
Correct Answer
(C) 1990
Explanation
Solution: Keys to soil taxonomy came in the year 1990 and developed under the leadership of Dr. Guy Smith.
Soil taxonomy is a hierarchical soil classification system with six categories or levels that are order, suborder, great group, subgroup, family and series. It is a morphogenetic soil classification system using diagnostic horizons and features to infer pathways of soil genesis and formation.
[#800] Who is considered as father of soil testing
Correct Answer
(B) Troug
Explanation
Solution: Emil Troug , an American Scientist is known as the father of soil testing. Soil tests may refer to one or more of a wide variety of soil analyses conducted to estimate the plant available concentrations of plant nutrients. It also helps in determining nutrient content, composition and other characteristics like the acidity or pH level of the soil.