Volume 35, Bulletins 522-555. (522) Role of Nitrogen, Phosphorus and Potassium Fertilizers in Continuous Corn Culture on Nicollet and Webster Soils; (523) Solving Tile Drainage Problems by Using Model Data; (524) Soybean Yields and Plant...
Volume 33, Bulletins 448-488. (448) Management Aspects of School Lunch Programs in Iowa; (449) Optimum Farm Plans for Beginning Tenant Farmers on Clarion-Webster Soils (An Application of Linear Programming); (450) Farm Planning for Maximum Profits...
Volume 34, Bulletins 489-521. (489) Ownership of Iowa's Farmland; (490) Identification and Measurement of Inefficiencies in Leasing Systems; (491) Comparison of Resource Returns of Well-Organized Iowa Farms with Selected Nonfarm Opportunities;...