Agricultural engineering is the engineering discipline that studies agricultural production and processing. Agricultural engineering combines the disciplines of mechanical, civil, electrical and chemical engineering principles with a knowledge of agricultural principles according to technological principles. A key goal of this discipline is to improve the efficacy and sustainability of agricultural practices. One of the leading organizations in this industry is the American Society of Agricultural and Biological Engineers. The ASABE provides safety and regulatory standards for the agricultural industry. These standards and regulations are developed on an international scale and include topics on fertilizers, soil conditions, fisheries, biofuels, biogas, feed machinery, tractors, and machinery.