Soil Science MCQ Question and Answer | Agriculture MCQ Question

Sodium nitrate supplies water supplies a water-soluble form of nitrogen without altering the pH of the soil. It contains 16% of nitrogen.

Calcium nitrate fertilizer is a water-soluble chemical solution that provides plants with supplemental calcium and nitrogen. Its nitrogen content is about 15%.

Potassium nitrate fertilizer is a water-soluble fertilizer with high potassium and nitrogen content along with an optimal amount of sodium, its nitrogen content is 13%.

Urea is the most important nitrogenous fertilizer and is widely used also because of its high Nitrogen content which is about 46%.

Bacillus radicicola is the organism responsible for Nitrogen fixation and was isolated by M. W. Beijerinck in 1888. This bacteria was discovered as it produces root nodules for fixation.
He observed the motile "swarmer" stage as well as the branching forms, that were developing the nodules for fixing atmospheric nitrogen.

The first law of Restitution was given by Leibig, which states that always restore the nutrients removed by the farming process, so as not to reduce the fertility of the soil.
The main motive of this principle is to increase the profitability of crop production without deteriorating soil fertility and food quality.

The relative purity or strength of the spectral colour of soil is Hue. The concept of a colour system with a hue was explored as early as 1830, and Munsell's colour system was a great step forward in realizing perceptual uniformity.
It is one of the main properties of a colour, which refers to the degree to which a stimulus can be described as similar to or different from stimuli that are described as red, orange, yellow, green, blue and violet (colour of vision).

Equivalent acidity is defined as the acidity developed by a fertilizer when applied to soils, measured in terms of calcium carbonate required for its neutralization.
Equivalent mass of acid or equivalent acidity = molecular mass of the acid/basicity.
The equivalent acidity of urea is 80.

India depends completely on imports for its need for Potash. India imports more than 4 - 5 million tonnes of potash every year mostly from South Korea, Canada and Belarus. The top import market for potash is India in the world.
Potash is a form of Potassium oxide, which is a vital nutrient of plants required throughout their life cycle. It helps them bear flowers and fruit also.

Nitrogen is the main component of our atmosphere and is required as a micronutrient by plants for their growth, development and also for survival.
The richest source of nitrogen out of all given options is dried blood. Adding dried blood to the soil will increase nitrogen levels to improve the growth of strong and healthy plants.
A blood meal is a dry, inert powder made from blood and one of the highest non-synthetic sources of nitrogen. Its nitrogen content is about 13.25%.

Granite is a course-grained intrusive igneous rock composed mostly of quartz, alkali feldspar and plagioclase. It is usually hard, massive and tough.
It is formed from magma with a high content of silica and alkali metal oxides that cools down slowly and solidifies underground.

When P > PET, it is said to be a Humid period.

A convenient method for determining total Sulphur in soils has been developed by using Calcium chloride.
It consists of the fusion of 0.500 g of soil with 1.4 g of sodium peroxide, followed by the determination of sulphate by turbidimetric measurement after interfering ions have been removed and thus estimated.