Is zakat obligatory on a plot of land, part of which was purchased with money from an association, while a portion of its price and the association's debts remain unpaid, and with no determined intention for its future disposition?

Zakat is not obligatory on the land you have purchased as long as your intention to sell it is not firm, because trade goods are not subject to Zakat unless they were acquired with the intention of trade. However, if you have other Zakat-eligible wealth, there is a difference of opinion among scholars regarding deducting debt from it.