Soil Science MCQ Question and Answer | Agriculture MCQ Question

A branch of science that deals with the study of the origin of the soil, its classification, and description are known as Pedology.
It is the discipline within soil science that focuses on understanding and characterizing soil formation, evolution, and the theoretical frameworks for modeling soil bodies, often in the context of the natural environment.

Nutrient index (N. I.) is a measure of the nutrient supplying capacity of soils to plants. It makes it easy to compare soil fertility of different areas of soil as it obtains a single value for each nutrient. It is calculated as a low, medium and high ratings of soil nutrients.
A nutrient index value below 1.5 is categorized as low.
The nutrient index between 1.5 and 2.5 is categorized as Medium.
A nutrient index value greater than 2.5, refers to a fertility status being high.

CAN is calcium ammonium nitrate also known as nitro-lime stone or nitrochalk, widely used as inorganic nitrogenous fertilizer. It is not basic.

SSP is single super phosphate and is the most popular phosphatic fertilizer after DAP. It contains 3 major plant nutrients i.e. Phosphorus, Sulphur, and calcium. It is not basic.

Sodium nitrate (NaNO₃) is also known as Chile saltpeter. It is a white deliquescent solid very soluble in water and is a readily available source of the nitrate anion. It is used in fertilizers, where it supplies the water-soluble form of nitrogen. It is basic but it does not alter the pH of the soil.

Little leaf disease is caused by the deficiency of Zinc. Its deficiency leads to stunted growth and little leaf disease in crop plants like brinjal etc.
Zinc is an important component of various that are responsible for driving many metabolic reactions in all crops. And if enzymes don’t work efficiently the whole growth and development will be hampered.

A soil having a pH of 6.0 is called Acidic soil. As the pH level below 7 is categorized as acidic soil whereas the pH of the soil above 7 - 14 is categorized as basic soil.
The use of fertilizers, especially those supplying nitrogen usually causes acidity in the soil. And most plants thrive in slightly acidic soil because that pH affords them good access to all nutrients.

Aluminum is an octahedral sheet of clay mineral that indicates Dioctahedral.
Octahedral sheets of clay are composed of individual octahedrons that share edges composed of oxygen of hydroxyl anion groups with Aluminium, Magnesium and Iron typically serving as the coordinating cations.
An aluminum octahedral sheet of clay has six OH ions at each of the six corners of an octahedron, with the aluminum atom at the center of the octahedron.

Iron is preferred by foliar spray because its soil application is not effective.
The plants absorb most of the nutrients in the fertilizer spray directly through the leaves than through soil application. It is like a direct application for quick and effective outcomes.
The application of foliar Iron sprays is a common means of correcting an Iron deficiency in crops.

A soil reclamation is a process of reclaiming the soil's quality like lost fertility, minerals, nutrients and moisture to make it fit for intensive use again.
The alkali-rich soils are reclaimed by the process of leaching, crop rotation and also by the addition of gypsum.
Gypsum is the major soil amendment used to reclaim alkali soils. Gypsum is a soft sulphate composed of calcium sulphate dehydrate.

SOP is Sulphate of Potash and MOP is Muirate of Potash means potassium chloride.
Some of the crops are sensitive to chlorides then in that case SOP is better to be used. SOP is not a naturally occurring mineral and usually must be produced through chemical methods. And because of the resource-intensive process used to create it, SOP is priced higher than MOP.

To calculate the quantity of zinc sulphate required, we use the formula:
Quantity (in grams) = Concentration (in ppm) × Volume (in liters) ÷ 1000

Given that the concentration is 200 ppm and the volume is 100 liters, we can calculate:
Quantity (in grams) = 200 ppm × 100 liters ÷ 1000 = 20 grams

Therefore, the correct answer is:
D. 20 grams