[Avodah] Buying a small plot of land for shmittah. Legitimate purchase?

[Avroham Yakov]

Hello,

I have received numerous mailing and seen many ads about bnei chutz la’aretz
purchasing small plots of land (4 amos x 4 amos) to be ma’kayim the mitzvos
te’luios be’aretz.

If I go ahead with this, is it a legitimate purchase?

Will that really help me ma’kayim the many mitzvos te’luios be’aretz?

Thank you,

Avroham

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