If these verses declaring the merit attaching to gifts of earth be recited on the occasion of a Sraddha, neither Rakshasas nor Asuras can succeed in appropriating any share of the offerings made in it. Without doubt, the offerings one makes unto the Pitris at such a Sraddha become inexhaustible. Hence, on occasions of Sraddhas, the man of learning should recite these verses on the subject of the merits that attach to gifts of earth, in the presence and hearing of the invited Brahmanas when engaged in eating. I have thus, O chief of the Bharatas, discoursed unto thee of that gift which is the foremost of all gifts.
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http://shukraguru.blogspot.com/search/label/Earth