Which formula is applied to calculate gypsum requirement (meq/I00gm)
A. $${\text{GR}} = \frac{{{\text{ES}}{{\text{P}}_{\left( {{\text{final}}} \right)}} - {\text{ES}}{{\text{P}}_{\left( {{\text{initial}}} \right)}}}}{{100}} \times {\text{CEC}}$$
B. $${\text{GR}} = \frac{{{\text{ES}}{{\text{P}}_{\left( {{\text{initial}}} \right)}} - {\text{ES}}{{\text{P}}_{\left( {{\text{final}}} \right)}}}}{{{\text{CEC}}}} \times 100$$
C. $${\text{GR}} = \frac{{{\text{ES}}{{\text{P}}_{\left( {{\text{initial}}} \right)}} - {\text{ES}}{{\text{P}}_{\left( {{\text{final}}} \right)}}}}{{100}} \times {\text{CEC}}$$
D. $${\text{GR}} = \frac{{{\text{ES}}{{\text{P}}_{\left( {{\text{initial}}} \right)}} - {\text{ES}}{{\text{P}}_{\left( {{\text{final}}} \right)}}}}{{100}} \times {\text{AEC}}$$
Answer: Option C
Solution(By Examveda Team)
Gypsum is a soft sulphate mineral composed of calcium sulphate dehydrate. It is used as fertilizer and helps soil better absorb water and reduces erosion also helps in the reclamation of soil.The gypsum requirement (GR) is the calculated amount of gypsum necessary to add to reclaim the soil.
$${\text{GR}} = \frac{{{\text{ES}}{{\text{P}}_{\left( {{\text{initial}}} \right)}} - {\text{ES}}{{\text{P}}_{\left( {{\text{final}}} \right)}}}}{{100}} \times {\text{CEC}}$$
ESP is Exchangeable sodium percentage.
CEC is Cation exchange capacity.
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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