The word kshetram itself is a wonderful sanskrit word. In his divine bhagavat geetha, geethacharyan says "edam sareeram kowthEyA kshetram ethyabhidheeyathE" (chap 13, sloka 1) [Oh! the son of kunti, this is the body it is called as a kshetram] What does kshethram mean? The meaning of the word kshetram is 'a cultivable land'. Depending on the qualities of a field, the farmer cultivates. The jeevatma is the farmer in the case of a body.

Why do we then call a divya desam or a sacrad place to be a kshetram?

Because this is a place where the lord who resides is the farmer who cultivates divine qualities (satvika gunas) and auspiciousness in the jeevatmas and blesses them with the fruit of moksha. Thirumazhisai Azhvar celebrates lord to be "paththi uzhavan" (expert farmer-nanmugan thiruvandhAdhi-23) as he cultivates in such a wonderful way to get the maximum yield even in barren lands like our hearts. That is why our elders stress the importance of divya desa vasam or if not possible, atleast visit divya desams regularly to get rid of this mundane cycle of life and death and reach the ultimate goal, ever happiness in the divine land of moksha (andamil pErinbam - Thiruvaimozhi 10-9-11)