The Journal of the Department of Agriculture, Victoria . as used in a finely powdered condition. lo July, 1Q12.] Iiifiuciicc of Certain Soil Coiistiliicnts. &c. 395 The soil used was that described as sandy in the previous article,and was taken from the same bulk. The chemical and mechanical analysisof this soil has already been published. The method of experiment was essentially the same as that adoptedin the earlier investigations. Air-dry soil, equal to 300 grams of drysoil, includ ng the added substance, if any, was wetted up to 60 per cent,of its water-holding capacity, and 5 ammoniu
The Journal of the Department of Agriculture, Victoria . as used in a finely powdered condition. lo July, 1Q12.] Iiifiuciicc of Certain Soil Coiistiliicnts. &c. 395 The soil used was that described as sandy in the previous article,and was taken from the same bulk. The chemical and mechanical analysisof this soil has already been published. The method of experiment was essentially the same as that adoptedin the earlier investigations. Air-dry soil, equal to 300 grams of drysoil, includ ng the added substance, if any, was wetted up to 60 per cent,of its water-holding capacity, and 5 ammonium sulphate solution con-taining gram nitrogen was mixed with the wetted soil. This nitrogenequalled SSS-^S Pirts per million of dry soil. After adding the ammoniathe soil was transferred to a bottle, and compacted by tapping to a uniformvolume in each case. With any substance, there were always two bottles,one getting ammDnia, and one getting no ammonia (control). Where am-monia was given, the water of solution was part of the water required to. ASPIRATl?vIG THli LOTTLES. give the desired moisture. The bottles were corked during the incuba-tion period, and were placed in a dark cupboard where the temperaturewas read daily at 9 and 5 Twice weekly the bottles wereuncorked, and aspirated for five seconds with a suction pump in orderto maintain fresh air. Number 17, however, was sealed, and kept closedthroughout the whole course of the experments. The eighteen tests, with their controls, required thirty-six bottles. An-other set was filled similar to these, making seventy-two bottles. In addi-tion, four extra bottles of Nos. i and 2 were placed aside in order to getsome idea when the tim-e had arrived to begin the full analyses. The methods of analyss adopted have already been described. Thework was performed by Mr. W. C. Robertson, chief deputy chemist, whoalso attended to the filling of bottles and keeping of records. o 2 396 Journal of Agriculture, Victoria. [lo Ju
Size: 1820px × 1373px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, booksubjectagricul, bookyear1902
