Soil Science - Study Mode

[#741] Water balance approach was given by
Correct Answer

(B) Thornwhite

Explanation

Solution: The water balance approach was given by Thornwhite . The law of water balance states that the inflows to any water system or area are equal to its outflows plus the change in storage during a time interval. In hydrology, a water balance equation can be used to describe the flow of water in and out of a system. It can also be referred to as how an organism maintains water in dry or hot conditions.

[#742] SAR of the normal soil is
Correct Answer

(A) Less than 15

Explanation

Solution: SAR is the sodium adsorption ratio and is the measure of the amount of sodium relative to calcium and magnesium in the water extract from the saturated soil paste. It is the ratio of the sodium concentration divided by the square root of one-half of the calcium and magnesium concentration. SAR of the normal soil is less than 15.

[#743] The share of urea in the N production pattern is
Correct Answer

(B) 85%

Explanation

Solution: Urea is a source of nitrogen, an essential nutrient crucial for crop growth and development. It is the most important nitrogenous fertilizer in the country because of its high N content (46%). The share of urea in the N production pattern is around 85%. Other Straight fertilizers, such as CAN and ammonium chloride account for only 2%. The share of N through DAP and other complex fertilizers is about 16%.

[#744] Potassic fertiliser containing maximum quantity of potash is
Correct Answer

(A) Muriate of potash

Explanation

Solution: Potassium fertilizer containing the maximum quantity of potash is Muriate of potash . It usually contains 60% K 2 O. It is the most common source of potash for farm use and is also the main potash ingredient for compound fertilizers containing potassium. MOP (Muriate of Potash) is a red-white crystal, completely soluble in water and therefore readily available to the crops.

[#745] With increasing water content, Thermal Conductivity of soil
Correct Answer

(A) Increases

Explanation

Solution: With increasing water content, the Thermal conductivity of soil Increases . As per the studies, it is seen that soil thermal conductivity increases as a power function of soil moisture content. The thermal diffusivity first increases with increasing soil moisture, then decreases after reaching its maximum.