FIELD METHOD FOR LIME REQUIREMENT OF SOILS

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Abstract
The method, based on laboratory data, in con-junction with laboratory rnethods, permits reduction of the number of samples to be analyzed in making surveys of large areas. It requires: (a) Compressed tablets of 0.5 gm. KCl and 0.0062 gm. Na2CO3 H2O; (b) brom-thymol blue; (c) 5 cc. measuring cup. Procedure: Mea-sure 3-4 5 gm. charges into separate test tubes. The measuring cup is filled and slightly heaped by pouring the crushed, but unground soil into it avoiding any shaking or jarring, then striking level. Add 1 tablet (a) to the first test tube, 2 to the 2nd, and so on. Crush the tablets before adding to the soil if too hard to dissolve quickly. Add 25 cc. of water, shake until (a) is completely dissolved, let settle, add 3 drops of (b) and read the end point, which is a green to greenish blue color.