Can NRIs invest in plantations?

This is an excerpt from the faq from RBI website
"
Q.9 Can a person resident outside India (i.e,. a NRI or a PIO or a foreign national of non-Indian origin) acquire agricultural land / plantation property / farm house in India by way of purchase ?

A.9 No. A person resident outside India cannot acquire by way of purchase agricultural land / plantation property / farm house in India.
"
What does this mean?
We are seeing lot of advertisements of plantations like santhimadom targetting NRIs..
Is everyone aware of this law?

Ralminov