Soil Science - Study Mode

[#886] For saline-sodic soils EC, ESP & pH values are
Correct Answer

(D) > 4, > 15, > 8.5

Explanation

Solution: Soils that have detrimental levels of neutral soluble salts and a high proportion of sodium ions are classified as saline-sodic soils. Plant growth in these soils can be adversely affected by both excess salts and excess sodium levels. For saline-sodic soils EC value is greater than 4, ESP is greater than 15, & pH values are greater than 8.5.

[#887] The purpling along the leaf edges is the characteristic deficiency symptom of
Correct Answer

(A) P

Explanation

Solution: The purpling along the leaf edges are the characteristic deficiency symptom of Phosphorus . It mostly occurs on the underside of the older leaves due to the accumulation of the pigment, Anthocyanin. Phosphorus is important for plants to promote photosynthesis, protein formation, seed germination, bloom stimulation and budding.

[#888] A soil which has pH < 8.5, ESP < 15 and EC > 4 dSm -1 at 25°C is called
Correct Answer

(A) Saline soil

Explanation

Solution: A soil with pH < 8.5, ESP < 15 and EC > 4 dSm-1 at 25°C is called Saline Soil . Saline soil is referred to as one that inhibits the growth of most crops because of the higher concentration of neutral soluble salts in it. ESP is Exchangeable Sodium Percentage, used to determine soil sodicity. EC is the electrical conductivity, used to measure the salinity of the soil.

[#889] Which one of the following is not correctly matched in the term of Soil order and Pronunciation?
Correct Answer

(D) Vertisols ⇔ Pedalfor

Explanation

Solution: Entisols are soils of recent origin. It is defined as soils that do not show any profile development other than an A horizon. Aridisols are Calcium containing soils of arid regions that exhibit subsurface horizon development. Histosols are soils that are composed mainly of organic materials. Vertisols are soils with a high content of clay minerals that shrink and swell as they change water content. It has no link with the word Pedalfor.

[#890] Flame photometer is used in the determination of
Correct Answer

(C) Potassium

Explanation

Solution: A flame photometer is used in the determination of Potassium . The principle of flame Photometer is based on the measurement of the emitted light intensity when metal is introduced into the flame. The wavelength of the colour gives information about the element and the colour of the flame gives information about the amount of the element present in the sample.