"Nitrogen fertilization and the keeping quality of apples : a preliminary report. "; "Hoffman, M. B.", "Knowlton, H. E. (Harry E.), 1890-"; "Apples--Storage.", "Apples--Fertilizers."; "Knowlton, H. E. (Harry E.), 1890-", "Hoffman, M. B."; "1930"; "Journal article reprint from: Proceedings of the American Society for Horticultural Science, 1930. "; ""; "P16997"; "pec"; "Apples--Fertilizers.", "Apples--Storage."; "14256"; .