By D. W. Gilchrist Shirlaw and J. E. Nichols (Auth.)
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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.
PLATE 2. Leaching rack. 58 A PRACTICAL COURSE IN AGRICULTURAL CHEMISTRY PLATE 3. Leaching stand. 6. This second flask is inverted to deliver into the funnel and fixed in place. 7. T h e soil is leached until almost 250 ml of leachate have been collected. This should take no less than 4 hr and preferably no longer than overnight. T h e speed of leaching will depend in part on the compaction of the glass wool and of the soil. If preferred a short length of rubber tubing and a screw clip can be fixed on to the bottom of the funnel to gain better control of the flow rate.
Let reading of flame photometer — x. T h e n concentration of calcium in solution = 0-bx ppm. And concentration of CaO in solution = 0·7χ ppm. 0·7χ Therefore in 25 ml of solution there were —TJT- mg CaO. This was in 10 ml of original soil extract. 50 A PRACTICAL COURSE IN AGRICULTURAL CHEMISTRY iX Therefore in 100 ml of original extract there were τττ mg CaO. This was equivalent to 2-5 g of soil. 30. THE DETERMINATION OF MAGNESIUM BY ATOMIC ABSORPTION Reagents required 1. A series of magnesium standards is required: 1, 2, 3, 4, 5 and 6 ppm.
A Practical Course in Agricultural Chemistry by D. W. Gilchrist Shirlaw and J. E. Nichols (Auth.)