Oswald Schreiner

1875

• Certain organic constituents of soils in relation to soil fertility
• Chemical nature of soil organic matter
• Colorimetric, turbidity, and titration methods used in soil investigations
• Crop injury by borax in fertilizers
• Essential plant food elements
• Examination of soils for organic constituents
• Lawn soils
• Less common elements in fertilizer practice
• Making the most of fertilizers
• Nitrogenous soil constituents and their bearing on soil fertility
• Occurrence and nature of carbonized material in soils
• Organic compounds and fertilizer action