Of course one hectare is twice as much land as you mentioned in you first post and the price will increase either a little or a great deal, depending on the location.
Frenchie made a very important point about security.
When I arrived in 2006 I found several quintas in the area near Tigre that looked very nice, but was advised against buying and living there due to lack of security.
If you find a property in a "gated" community you will have to pay monthly expenses/fees in addition to utilities, taxes, etc. There may also be restrictions on how extensively you would be "allowed" to work the land.
You could buy an older (but well maintained) house with one hectare of land (with mature trees) near me for less than $100K USD. You could do almost anything you want with the land, but you might not enjoy living here as much as I do, 650 KM from the Capital.