Plantation units refer to the units of measurement used to measure the size of a plantation. ACRES (ACRE) is a unit of area, equal to 4, 840 square yards or 43, 560 square feet. Bales (BALE) is a unit of measurement for agricultural products such as cotton, tobacco, and hay, typically weighing between 500 and 700 pounds. Plantation units are used to measure the size of a plantation and the amount of crops produced.