Soil Science MCQ Question and Answer | Agriculture MCQ Question

In crop logging, during the growing season, plant tissue is sampled every 35 days and analyzed for Nitrogen, sugar, moisture and weight of the young sheath tissue.
Crop logging is a system of monitoring the nutritional status of plants by periodic and regular sampling and analysis of soil and plant parts. The main motive is to be able to correct the nutritional problem while the plant is still standing and can benefit from the corrective measure.

Terai soil comes under Mollisol. Terai is a low land in a lowland region in northern India Soils which are mostly similar to mollisols but contain either continuous or discontinuous permafrost.
Mollisol is a soil type that has deep, high organic matter, nutrient-enriched surface soil, typically between 60 and 80 cm in depth, and this fertile surface horizon is called mollic epipedon.

Then Value Cost Ratio (VCR) is the amount of money earned per money spent. In response to the fertilizer, the ratio of unit fertilizer price to unit crop price for different levels of fertilizer response.
If one kg nutrient worth Rs. 6 produces an extra crop worth Rs. 20, the value cost ratio will be 20 - 6 = 14.

Five stages of soil development are given by both Mohr and Van Baren.
They hypothesize five stages of soil development in the tropics based on the properties of soil, and these are initial, juvenile, virile, senile and final.
The evolution of soils and their properties is called soil formation, and the factors which influence this are parent material, topography, climate, organisms and time.

Urea hydrolysis results in an increase in soil pH around the urea granules, thereby subjecting the NH₄⁺ produced to volatilization in form of NH₃ in the presence of the enzyme Urease.
Urea hydrolysis in soil produces ammonium carbonate and finally ammonium and carbonic acid.

Anion exchange capacity (AEC) represents the positive charge available to attract anions in solutions. Soils that have an anion exchange capacity typically contain weathered kaolin minerals, iron and aluminum oxides and amorphous materials.
It is dependent upon the pH of the soil and the anion exchange capacity (AEC) increases as soil pH Decreases.

The weathered material transported through water and deposited in river basins is termed Alluvial.
An alluvial fan is a triangle-shaped deposit of gravel, sand and even smaller pieces of sediment, such as silt. This sediment is called alluvium. Alluvial fan are usually created as flowing water interacts with mountains, hills and steep walls of canyons.

Barkhan & Inselberg are formed due to the action of wind.
Barkhan is a crescent-shaped dune produced by the action of wind predominantly from one direction.
An inselberg is an isolated rock hill, knob, ridge, or small mountain that rises abruptly from a gently sloping or virtually level surrounding plain.

Strengite is a relatively rare iron phosphate mineral with the formula FePO₄·2H₂O.
Variscite is a hydrated aluminum phosphate mineral with the formula AlPO₄·2H₂O. it is a relatively rare phosphate mineral.
Gibbsite is one of the mineral forms of aluminium hydroxide with the chemical formula Al₂O₃·3H₂O. It is an important ore of aluminium.
Hematite is a heavy and relatively hard oxide mineral, ferric oxide (Fe₂O₃), that constitutes the most important iron ore because of its high iron content (70 percent) and its abundance.

The Softest mineral is Talc. This softest mineral position is given at bottom of Moh's scale of Hardness with a relative hardness value of 1. It has a soapy, greasy feel.
Talc is formed by the hydrothermal alteration of ultrabasic rocks or low-grade thermal metamorphism of siliceous dolomites.