. Bulletin of the Department of Agriculture. Agriculture; Agriculture. BULLETIN OF THE MPMIIOFAflOJIM No. 97 Contribution from the Bureau of Soils, Milton Whitney, Chief. June 12, (PROFESSIONAL PAPER.) IDENTIFICATION OF COMMERCIAL MATERIALS. FERTILIZER By William H. Fry, Scientist in Soil Laboratory Investigations. INTRODUCTION. In working with commercial fertilizers it is often desirable to know not only the percentages of the various ingredients as given by chemi- cal analysis but also the compounds in. which these occur in the fer- tilizer, i. e., the carriers of these ingredien
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. BULLETIN OF THE MPMIIOFAflOJIM No. 97 Contribution from the Bureau of Soils, Milton Whitney, Chief. June 12, (PROFESSIONAL PAPER.) IDENTIFICATION OF COMMERCIAL MATERIALS. FERTILIZER By William H. Fry, Scientist in Soil Laboratory Investigations. INTRODUCTION. In working with commercial fertilizers it is often desirable to know not only the percentages of the various ingredients as given by chemi- cal analysis but also the compounds in. which these occur in the fer- tilizer, i. e., the carriers of these ingredients. The calculation of the rational composition from the ultimate analysis in the case of salts gives results which are open to doubt and requires a much more com- plete analysis than is usually made. In the case of organic materials such a calculation is practically impossible. It, therefore, becomes necessary to identify a great number of the substances occurring in commercial fertilizers by means which give the compounds as dis- tinguished from the chemical ingredients of these compounds. The following substances were chosen for examination: Potassium chloride. Potassium sulphate. Ammonium sulphate. Kainite. Sodium nitrate. Superphosphate. Calcium nitrate. Lime. Apatite. Phosphate rock. Gypsum. Limestone. Calcium cyanamid. Basic slag. Ground rocks and minerals. Cottonseed meal. Raw bone meal. Steamed hone meal. Peat, humus, muck, etc. Dried blood. Slaughterhouse tankage. Garbage tankage. Fish scrap. Dissolved bone black. Shells. Note.—This bulletin gives methods for identifying the carriers of the various fertilizing ingredients, and is intended to serve as a laboratory guide to those studying this phase of the fertilizer question. 38791°—14. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original United Sta
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