Explanation:

In drip irrigation, water is applied directly to the roots, and not the entire field because of which the weed do not get sufficient moisture which reduces the weeds growth.

 Generally excessive logging and flooded fields suffer from higher salinity. So, replacing conventional irrigation may help in curbing water-logged soil salinity. But according to the given option we need to do elimination and statement 2 is least probable option.

Drip irrigation reduces soil erosion as water is delivered directly to plant roots at a very slow  which help in reducing the flow of surface soil.