Allow two to three inches from soil to top of container for water. Firm the soil around the root ball. Scatter balanced fertilizer as recommended on package and water in once more. Water again in two days. Water every week, or more often if necessary.
Good drainage is essential.
Keep the soil moist. Don't let the tree dry out. In the ground , maintain a deep basin as wide as the tree. Citrus need a moist soil and air for roots - avoid airless and soggy soil. Allow time for it to drain between waterings.