Sodium adsorption ratio (SAR) can be calculated by using of formula
A. $${\text{SAR}} = \frac{{{\text{N}}{{\text{a}}^ + }}}{{\sqrt {{\text{C}}{{\text{a}}^{2 + }} + {\text{M}}{{\text{g}}^{2 + }}} }}$$
B. $${\text{SAR}} = \frac{{{\text{N}}{{\text{a}}^ + }}}{{\sqrt {\frac{{{\text{C}}{{\text{a}}^{2 + }} + {\text{M}}{{\text{g}}^{2 + }}}}{2}} }}$$
C. $${\text{SAR}} = \frac{{{\text{C}}{{\text{a}}^{2 + }} + {\text{M}}{{\text{g}}^{2 + }}}}{{\sqrt {{\text{N}}{{\text{a}}^ + }} }}$$
D. $${\text{SAR}} = \frac{{{\text{N}}{{\text{a}}^ + }}}{{\sqrt {\frac{{{\text{C}}{{\text{a}}^{2 + }} + {\text{K}}}}{2}} }}$$
Answer: Option B
Solution(By Examveda Team)
Sodium adsorption ratio is a measure of the amount of sodium (Na) Relative to calcium (Ca) and Magnesium (Mg) in the water extract from 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.It can calculated by using formula: $${\text{SAR}} = \frac{{{\text{N}}{{\text{a}}^ + }}}{{{{\left[ {\left( {\frac{{{\text{C}}{{\text{a}}^{2 + }} + {\text{M}}{{\text{g}}^{2 + }}}}{2}} \right)} \right]}^{0.5}}}}$$
Which one is the most important among Amphibloes
A. Hornblend
B. Tremolite
C. Diopsite
D. Actinolite
Sources of negative charges on silicate clays is/are
A. Exposed crystal edges
B. Isomorphus substitution
C. Anion exchange
D. All of these
The most conspicuous chemical change that take place when soil is flooded is reduction of
A. Fe
B. P
C. S
D. None of these
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