Potassium polyacrylamide based. Protects bare root seedlings, shrubs, crops, grasses/sod, and flowers from transplant shock, “dry-out” in shipping/storage, lack of irrigation, drought and more! Maximizes germination, shelf life, vigorous plant growth. Treats 2,000 to 4,000 bare root seedlings per pound of Terra-Sorb in the nursery, 1,500 to 2,000 bare root seedlings per pound in the field. Particles have effective life of up to five years in the soil and absorbency up to 400 times dry weight. Contains no starch. Less susceptible to biodegradation. Require a period of time to reach full absorbency, from 20 minutes for the small particle (Fine Grade), to over one hour for the large particle (Medium Grade). Terra-Sorb Medium Grade Approximately 0.10″ (.75 to 2.0 mm) particle size. Can be mixed into the soil. Recommended for transplanting trees and shrubs, preparing planting beds. Application: For transplanting, use 1 oz. per foot of root ball diameter. For planting beds, use 2 lbs. per 100 sq. ft. of 6″ deep bed.