is to put the salt in agriculture land offence ???

Putting salt in Agricultural Land is known as Salinity.

It does hurms the soil.

Soil salinity may affect the productivity of agricultural land directly as a consequence of the presence of critical amounts of soluble salts in the root zone, which limit water and nutrient uptake by plants and cause physiological and metabolic disorders.

Indirectly, salts may affect plants through adverse soil properties caused by sodicity and alkalinity imposed on the soil by soluble salts which may or may not be present in amounts detrimental to plants.

The US has their own Salinity Control Act.

I am NOT sure about India having/NoT having an  Indian Salinity Control Act