The Journal of the Department of Agriculture, Victoria . 273 TO May, 191-.] IiiflKi-iicc of Soil MoislKrc upon Nitrificaiion. •79 In the chemical analysis the larger percentage of lime, and particularlyof carbonic acid, in the clav is notable as representing available base. soil with .032 carbonic acid falls below the minimum requirements.*and is apparently deficient in available lime—a point which will be referredto later on. Analytical Methods. Before going on to the results, the analytical methods must be brieflydescribed. Moisture.—At the close of the experiments, the soil in the
The Journal of the Department of Agriculture, Victoria . 273 TO May, 191-.] IiiflKi-iicc of Soil MoislKrc upon Nitrificaiion. •79 In the chemical analysis the larger percentage of lime, and particularlyof carbonic acid, in the clav is notable as representing available base. soil with .032 carbonic acid falls below the minimum requirements.*and is apparently deficient in available lime—a point which will be referredto later on. Analytical Methods. Before going on to the results, the analytical methods must be brieflydescribed. Moisture.—At the close of the experiments, the soil in the bottles wasmixed, and 25 grams dried at 212 deg. F. for five hours in a tarred dish. Xitrate Xitrogen.—Fifty grams of the mixed soil from the bottleswas transferred to a small bag of nainsook, and 250 of a solution con-taining sat. potash alum + .64 formalin was poured over thesoil in the bag placed in a mortar. After kneading for 2 min. as much ofthe solution as possible was transferred to a Mason jar. and left over. READING THE night to settle. Fifty of the clear solution was evaporated to the water bath, cooled, and 20-30 drops disulphonic acid (Gill) added,stirred, and left ten minutes. There was then added 15 distilled water,potash till alkaline, the solution was filtered if necessary, and ma(ie upto 50 This solution was read in the colorimeter against standardnitrate of potash. Allowance was made for the water in the moist \ll solutions and salts used were tested for nitrate, and care was taken inwashing the bags, and preparing nitrate-free water. Chlorides were eliminated with a measured quantity of saturated silver .sulphate. Theanalytical work was carried out bv Mr. \\. ( . Robertson, chief deputychemist. Results of the First Experiments. Table IV. gives the progress of nitrification in sandy soil, with difterentdegrees of moisture. Airunonia nitrogen added-^ .02121 gram per 300grams soil
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