Engelhorn, A. J., Pesek, J., & Shrader, W. D. (1964). Role of nitrogen, phosphorus and potassium fertilizers in continuous corn culture an nicollet and webster soils. Agricultural and Home Economics Experiment Station, Iowa State University of Sciene and Technology.
Chicago-Zitierstil (17. Ausg.)Engelhorn, A. J., John Pesek, und W. D. Shrader. Role of Nitrogen, Phosphorus and Potassium Fertilizers in Continuous Corn Culture an Nicollet and Webster Soils. Ames, Iowa: Agricultural and Home Economics Experiment Station, Iowa State University of Sciene and Technology, 1964.
MLA-Zitierstil (9. Ausg.)Engelhorn, A. J., et al. Role of Nitrogen, Phosphorus and Potassium Fertilizers in Continuous Corn Culture an Nicollet and Webster Soils. Agricultural and Home Economics Experiment Station, Iowa State University of Sciene and Technology, 1964.