CONTENTS. 



Page. 



I. Methods for the analysis of fertilizers 1 



1. Preparation of sample i 



2. Moisture \ 



3. Phosphoric acid 1 



(a) Gravimetric method 1 



(b) Optional volumetric method 4 



4. Nitrogen 5 



(a) Kjeldahl method 5 



(b) Gunning method 7 



(c) Kjeldahl method modified to include the nitrogen of nitrates. . 7 



(d) Gunning method modified to include the nitrogen of nitrates. . . 8 



(e) Absolute or cupric oxid method s 



(f ) Magnesium oxid method 9 



(g) Ulsch method, modified by Street 10 



(h) Zinc-iron method 10 



(i) Neutral-permanganate method 10 



(j) .Alkaline-permanganate method 11 



5. Potash 11 



(a) Lindo-Gladding method 11 



(b) Optional method 12 



(c) Factors 12 



II. Methods for the analysis of soils 13 



1. Directions for taking samples 13 



(a) Method 1 13 



(b) Method 2 13 



2. Preparation of sample 14 



3. Moisture 14 



4. Volatile matter 14 



5. Strong acid digestion of the soil 14 



(a) Method of preparing soil solution 14 



(b) Ferric and aluminic oxids and phosphates, collectively 15 



(c) Manganese 15 



b(d) Calcium 15 



(e) Magnesium 16 



(f ) Phosphoric acid 1C 



(g) Sulphuric acid 17 



(h) Potassium and sodium 17 



6. Acid-insoluble materials 18 



7. Total alkalies 18 



8. The more active forms of phosphoric acid in soils 18 



(a) Solutions required 18 



(b) Determination 18 



9. Lithium, caesium, and rubidium 19 



10. Total nitrogen 19 



v 



