Economic return with conventional, integrated and ecological farming. [Results from the system trial: "Different types of farming methods and their impact on the environment, product quality and economy" at Planteforsk Apelsvoll Research Center]

accounting budget budgets contabilidad costos costs cropping systems economic analysis exploitation agricole explotaciones agrarias farm results farming systems farms modele modelos models noruega norway presupuesto production economics rendement rendimiento sistemas de cultivo subsidies subsidios subvention yields