How is Zakat calculated on money and land in the case of a partnership in an investment land that has not yet reached its Hawl (one year of possession), with a debt owed by the partner, and liquid assets that have reached their Hawl?

Zakat becomes obligatory on your share of the land if it reaches the nisab by itself or by joining with other assets. The passing of a lunar year is considered the completion of the hawl. As for debts owed by you, they can be deducted from the value of your share and other assets if you do not have surplus funds beyond your needs. If, after deduction, what remains is not less than the nisab, then pay zakat on it; otherwise, no zakat is due from you.