Question

Soil salinity is measured by
A. Porometer
B. Potometer
C. Calorimeter
D. Conductivity meter

Answer 1

Hint: Soil salinity is usually defined as the measure of salt present in the soil. This condition is described by the term salinization. It means accumulation of salt in the soil. These soil are usually water soluble and get dissolved in soil with the help of water. Soil salinity can be good for plants but sometimes it can affect plant health in a bad way also.

Complete answer: soil salinity can be measured by passing an electric current between the two electrodes of a salinity meter in a sample of soil . The electrical conductivity of a soil sample is influenced by the concentration and composition of dissolved salts in the soil.
Now let us know the function of each option :-
Porometer :- it usually measures the conductance or resistance of the stomata and not soil salinity. Hence this option is not correct.
Potometer :- it is also known as transpirometer and measures the rate of water uptake by the shoot and not soil salinity. Hence this option is not correct.
Calorimeter :- it is used to measure the heat in chemical reactions and not soil salinity. Hence this option is not correct.
Conductivity meter :- soil salinity is measured by passing current so it is measured by conductivity meter. Thus this option is correct.

Our required answer is d that is conductivity meter.

Note: A conductivity meter consists of a tool that measures the conductivity of given solution or substance as of soil. electrical current flows between two electrodes a .If there is presence of high concentration of ions ( salt) in the solution, the conductance is high, resulting in a fast current.