The Journal of the Department of Agriculture, Victoria . rforated tinvessels containing pulverised rock phosphate and bone-dust respectively, ina garden soil and covering them to a depth of 12 inches. The soil was watered every morning and, by a launder arrangement,the drainings were separately collected in two glass vessels. After the expiration of one month, the drainage water in each vesselwas tested for phosphoric acid, with the result that the drainings from thebone-dust gave a distinct affirmative reaction, whereas the test on the liquidfrom the rock phosphate gave an entirely negative r
The Journal of the Department of Agriculture, Victoria . rforated tinvessels containing pulverised rock phosphate and bone-dust respectively, ina garden soil and covering them to a depth of 12 inches. The soil was watered every morning and, by a launder arrangement,the drainings were separately collected in two glass vessels. After the expiration of one month, the drainage water in each vesselwas tested for phosphoric acid, with the result that the drainings from thebone-dust gave a distinct affirmative reaction, whereas the test on the liquidfrom the rock phosphate gave an entirely negative result. In the experiment under review, the mode of procedure was asfollows :— Two lots of virgin soil, each weighing 7 lbs., were placed in twoearthenware jars having an outlet at the bottom. From the latter, a tube with stop cock attached, led to a glass jar con-taining in one case 100 grammes of finely ground rock phosphate, and inthe other the same amount of bone-dust. The following diagram will serve to show the arrangement of theapparatus:—?. or fi,one dust- The sod in the earthenware receptacles was kept saturated with waterand the dramage conducted through the outlet tube to the glass jars andthus allowed to act upon the material contained therein. The experimentwas conducted over a period of four months, but progress analyses wereconducted at the end of {a) one week, {b) one month, {c) four months. The soil in the first instance was analysed for humus and availablephosphoric acid and was found to contain per cent, humus, whilst theavailable phosphoric acid content was infinitesimal. The soil water wasof an acidity equal to .012 per cent, citric acid. II Nov., Tgi2.] (icrdiiiu)ii Ciillivation jar /i-<xciituil Oil. 677 The suhioiiifd tahlt- gives the results :- Material Treated. Ier cent, of Total Phosphoric Acid dissolved in- Ratio of One Week. One Month. Four Months. Solubility Bone dustRock Phos])h;ite per Nil per cent. •75?0019 per 2
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectagricul, bookyear1902
