Rice hulls (or rice husks) are the hard protecting coverings of grains of rice. In addition to protecting rice during the growing season, rice hulls can be put to use as building material, fertilizer, insulation material, or fuel. AND ANIMAL FEED 0 Potential On-Farm Uses of Rice Hulls Compost Production and Soil Improvement. ... Biochar Production. ... Fuel and Briquette Production. ... Supplemental Construction Material. ... Bedding for Hog/Chicken Deep Litter Systems. ... Livestock Feed Supplement. ... Potting Mix Production. ... Mushroom Production Substrate.