Explanation:

Why: Standard questions that are lifted from www.agritech.tnau.ac.in every year. Expect 2-3 questions on core agricultural practices next year as well.
Statement 1: Tillage is the agricultural preparation of soil by mechanical agitation of various types, such as digging, stirring, and overturning.
No-till farming (also called zero tillage or direct drilling) is a way of growing crops or pasture from year to year without disturbing the soil through tillage. Zero tillage helps in soil moisture conservation.
Statement 2: An infiltration problem often occurs in farms if the irrigation water does not enter the soil rapidly enough during a normal irrigation cycle.
Gypsum helps in dissolution of the salt clay pan found in soils that hinder the percolation of water. This increases the efficiency of irrigation as less water is needed to irrigate the same soil.
Adding gypsum to irrigation water further increases its infiltration rate.
Statement 3: This reduces evaporation of farm soil water.