Soil Science MCQ Question and Answer | Agriculture MCQ Question

COLE is known as the Coefficient of linear extensibility. It is also known as Potential volume exchange as well as a swell index.
The coefficient of linear extensibility is a quantitative expression to classify soils according to their swell and shrink potential and its estimation is crucial for engineering and agronomic applications.

Void ratio is defined as the ratio of the volume of voids to the total volume of soil solid. It is a mixture is the ratio of the volume of voids to the volume of solids. It is denoted by the letter 'e'.
The range of Void ratio (e) is 0.3 - 2.0. if the void ratio is high (loose soils) voids in a soil skeleton tend to minimize under-loading-adjacent particles contract. Whereas, when the void ratio is relatively small (dense soils), indicates that the volume of the soil is vulnerable to increase under loading-particles dilate.

The oxidation state of Sulphur is +6 to -2. A monatomic ion’s oxidation state is the same as its charge.
The oxidation state shows the total number of electrons that have been removed from an element (a positive oxidation state) or added to an element (a negative oxidation state) to get to its present state.

Soil preservation is the prevention of loss of the top layer of the soil from erosion or prevention of reduced fertility caused by over usage. Thus, soil conservation can be called Protection against loss.
Soil conservation farming involves no-till farming, green manures and soil enhancing practices which make it hard for soils to be equalized.

Soil series occurring together in repeating geographic patterns are grouped into Soil association. It is a group of closely associated soil profiles on one parent material and one soil zone.
The soil association developed the world's first organic standards in 1960.
A place name is assigned to each soil association. That place name is usually the name of a town near where the soil was first recognized and described by soil surveyors.

Intrinsic permeability is an attribute of the Soil matrix.
Intrinsic permeability is a measure of the relative ease with which a porous medium can transmit fluid under a potential gradient and is a property of the medium alone.
Whereas, the soil matrix is the solid phase of soils and comprise the solid particles that makeup soils.

Kaolinite is a clay mineral with layered silicate minerals, with one tetrahedral sheet of silica linked through an oxygen sheet of alumina octahedral. It is observed that kaolinite is very active in phosphate fixation.
An illite is a group of closely non-expanding clay minerals. Its structure is a 2 : 1 sandwich of silica tetrahedron–silica layers.
Montmorillonite is a very soft phyllosilicate group of minerals that form when they precipitate from water solution as microscopic crystals. Its chemical formula is (Na, Ca)_0.33(Al, Mg)₂(Si₄O₁₀)(OH)₂·nH₂O.
Vermiculite is a hydrous phyllosilicate mineral that undergoes significant expansion when heated. Vermiculite clays are weathered micas in which the potassium ions between the molecular sheets are replaced by magnesium and iron ions.

Nitrolim fertilizer is calcium cyanamide an inorganic compound with the formula CaCN₂ + C. It is the calcium salt of the cyanamide anion. It reacts with water to form ammonia. This chemical is used as a fertilizer and is commercially known as nitrolime. It was first synthesized in 1898 by Adolph Frank and Nikodem Caro.

Rock phosphate is a non detrital sedimentary rock that contains high amounts of phosphate minerals. Rock phosphate has a chemical composition of Ca₃(PO₄)₂.
the phosphate content of phosphorite varies greatly from 4% to 20% phosphorous pentaoxide (P₂O₅).
Around 90% of rock phosphate production is used for fertilizer and animal feed supplements and the balance for industrial chemicals.

Zinc sulphate monohydrate contains approximately 35% of Zinc and around 15% Sulphur. It is used as a basal application and as a foliar spray to fulfill the deficiency of Zinc and Sulphur in plants.
It is an inorganic compound that was historically known as "white vitriol" and it has a variety of uses in medicines, industry and more.