Soil Science MCQ Question and Answer | Agriculture MCQ Question

SSP (Single Super Phosphate) is the most popular phosphatic fertilizer. The percentage of P₂O₅ is approximately 16 - 20% in SSP.

TSP (Triple Super Phosphate), is a chemical fertilizer with a P₂O₅ content of over 40 - 48%.

DAP (Diammonium Phosphate) is the widely used phosphate-based fertilizer with a phosphorus content of 54%.

Rock phosphate is the phosphorite, is mined from clay deposits that contain phosphorus and is used to make organic phosphate fertilizers that many gardeners utilize. It contains 20 - 30% of P₂O₅.

Nitrate can be absorbed by roots as it can be lost by the process of Leaching. Nitrogen can be lost from agricultural lands through soil erosion and runoff.
Leaching is the loss of water-soluble plant nutrients from the soil or applying a small amount of excess irrigation to avoid salinity.

Thiobacillus is one of the denitrifying bacteria which is as well as a Sulphur oxidizer.
Denitrifying bacteria are the group of microorganisms whose action results in the conversion of nitrates in the soil to free atmospheric nitrogen.
And suphur oxidizers are the microorganisms that produce reduced Sulphur compounds formed as a product of anaerobic heterotrophic respiration with sulphate.

Percent yield is the percent ratio of actual yield to the theoretical yield. This concept is given by “Baule”.
It is calculated as the experimental yield divided by the theoretical yield multiplied by 100%. In the case where actual yield and theoretical yield are the same, the percent yield is 100%.

Feldspar is the primary mineral and group of naturally occurring aluminosilicate minerals containing varying amounts of potassium, sodium, calcium or lithium which occur in igneous rocks.
Feldspars make up about 60% of the earth's crust, 41% of the Earth's crust and 41% of the Earth's continental crust by weight.

The use of balanced fertilizer use is most desirable because it corrects all deficiencies. A balanced fertilizer is a fertilizer that has three numbers that are about the same, like a ratio of 10 : 10 : 10.
Balanced application of fertilizers enhances fertilizer use efficiency and leads to an increase in crop yields by improving the physical, chemical and biological environment of the soil.

Basic slag is low in silica and high in base-forming oxides that are used in the basic process of steelmaking and that are subsequently useful as a fertilizer.
A basic slag contains oxides like MgO and CaO, which makes the slag thicker.
The chemical composition of basic slag is (CaO)₃P₂O₅, SiO₂.

The particle density of normal soil is 2.65 gm/cm³. It is defined as the mass of a unit volume of sediment solids.
Particle density is the density of the solid particles that collectively make up a soil sample. The value is commonly expressed in grams per cubic centimeter.

The bacterial population constitutes 2 - 4% of organic matter.
Soil organic matter is the organic component of soil, consisting of three primary parts including small and fresh plant residues, small living soil microorganisms, decomposing active organic matter and stable organic matter.
Soil organic matter is the primary source of carbon which gives energy and nutrients to soil organisms.

Gleization is the pedogenic process of soil formation under an anaerobic environment and leads to the development of a gley horizon in the lower part of the soil profile with green-blue colours above the parent material due to poor drainage conditions, related to the reduction of soluble ferrous iron under water-logged conditions.
This pedogenic process occurs in Bog soil, which is oxygen and nutrient deficient and is much more acidic than other soils.