Lecture—3 hour(s); Discussion—1 hour(s). Prerequisite(s): PLS 110C or PLS 111; or the equivalent. Unifying concepts of cropping systems in temperate and tropical climatic zones; agroecosystems stability, diversity and sustainability; management strategies, resource use efficiency and their interactions; role of animals, their impact on energy use efficiency, nutrient cycling, and providing food and power.. Not open for credit to students who have completed former IAD 200. (Letter.) Effective: 2017 Winter Quarter.