Soil Science MCQ Question and Answer | Agriculture MCQ Question

Red soil is a type of soil that develops in warm, temperate and humid climates and comprises around 13% of the earth's soil. it is clayey in texture and rich in Iron oxide.
Alkali soil is clay soil with high pH, greater than 8.5, a poor soil structure and a low infiltration capacity.
Black soil is rich in lime, iron, magnesia, potash and alumina. The colour of the soil ranges from deep black to grey.
Laterite is both soil and rock type rich in iron and aluminum and is commonly considered to have formed in hot and wet tropical areas. The pH of this soil is less than 7 and is acidic.

A soil test commonly refers to the analysis of a soil sample to determine nutrient content, composition, and other characteristics such as acidity or pH level.
It is done to estimate the plant-available concentrations of plant nutrients and to determine fertilizer recommendations.
Emil Truog is the father of soil testing.

Out of the given options concentration of Oxygen, the element is highest in soil.
Soil is porous and the pores of the soil are filled with air in the cavities. And it is well-known oxygen is the second most abundant element after nitrogen in the air, thus the concentration of oxygen is more than iron, Copper and Zinc.

All the given elements Chlorine, Molybdenum and Potassium are mobile with the plant system.
The upward movement of calcium takes place in the transportation stream through the xylem. The calcium ions do not move by mass flow but by a series of exchange reactions along negatively charged sites on the wall of the xylem vessels.
They move from one place to another when there is any deficiency detected in plants. Plant moves mobile nutrients from older issues to newer tissues.

The nitrogen in all fertilizers comes from the air.
Nitrogen is also a component of the chlorophyll molecule, which enables the plant to capture sunlight energy by photosynthesis, driving plant growth and grain yield. Nitrogen plays a critical role within the plant to ensure energy is available when and where the plant needs it to optimize yield.

Soil fertility and fertilizers were written by Tisdale et al.
This is an introduction to nutrient management and provides a thorough understanding of the biological, chemical and physical properties affecting soil fertility and plant nutrition. Covering all aspects of nutrient management for profitable crop production, the text pays particular attention to minimizing the environmental impact of soil and fertilizer management.

An ammoniacal form of nitrogenous fertilizer will be preferred for paddy and potatoes. Nitrogen requirements of rice crops are met from both the soil and fertilizers. The main form of nitrogen taken up by rice roots is ammonium in flooded paddy soil.
Potatoes can utilize nitrate, ammonium and urea nitrogen. Urea must be converted to ammonium inside the plant with the aid of urease.

Eisenia Fetida is the earthworm species that is most efficient for vermiculture. The common names of this earthworm are manure worm, red worm, wiggler worm, etc. red wigglers are reddish brown, have small rings around their body and have a yellowish tail.
It is used for vermicomposting of both domestic and industrial waste. Vermicomposting septic systems have been used for decades and allow for decentralized on-site processing of black water using Eisenia fetida.

Muriate of potash (MOP) is the only fertilizer that is not produced in India. As India imports all of the potash we do not have any reserve of potash in India.
India imports handle promotes and markets potash fertilizers in India.
MOP (Muriate of Potash) is a red-white crystal, completely soluble in water and therefore readily available to the crops.
It usually contains 60% K₂O. It is the most common source of potash for farm use and is also the main potash ingredient for compound fertilizers containing potassium.

The diffusion coefficient (D) is the amount of a particular substance that diffuses across a unit area in 1 s under the influence of a gradient of one unit.
Moisture content is determined by subtracting the dry weight from the initial weight, and the moisture content is then calculated as the amount of water divided by the dry weight or total weight.
The relation of D_e (diffusion coefficient) with moisture content (θ) is that D_e increase with the increase in θ up to saturation.