By D. W. Gilchrist Shirlaw and J. E. Nichols (Auth.)
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T H E ANALYSIS O F SOILS 39 (d) 0*1 normal hydrochloric acid is again run into the flask until the indicator turns back to pink. (e) T h e flask is again boiled. (f) Steps (d) and (e) are repeated until a permanent pink colour is obtained. (g) T h e volume of acid used is noted. 4. At the end of the hour the soil suspension is filtered; double filtering may be required to obtain a clear solution. 5. 50 ml of the filtrate are titrated against 0-1 normal hydrochloric acid as in step 3. 6. T h e lime requirement of the soil is calculated.
Reagents required 1. Sodium tetraphenyl boron is prepared as a 1 per cent solution in distilled water. 2. 0· 1 normal sodium hydroxide is also required. 3. Two standard potash solutions in Morgan's reagent are necessary: 10 ppm and 20 ppm. Procedure 1. 2 ml of the soil extract are pipetted into a test-tube. 2. hydroxide is added. 3. 4 ml of distilled water are added and the tube and contents well shaken. 4. The turbidity developed is compared against turbidities of a blank, 10 ppm potash, and 20 ppm potash, prepared in a similar manner.
T h e unknown solution is now sprayed and the reading noted; if the reading is over 100, the solution should be diluted and a second reading taken. A reading for a diluted solution must, of course, be multiplied by the dilution factor before the concentration is calculated. 3. T h e concentration of potash in the soil is given by the following formula: mg available potash per 100 g of soil = meter reading X 0*48 46 A PRACTICAL COURSE IN AGRICULTURAL CHEMISTRY (The concentration of potassium in the soil extract is given by: meter reading —iö— p p m The concentration of potash (K 2 0) can be obtained by multiplying this figure by 1-2.