. Some effects of a harmful organic soil constituent . ^; or, if so, it would mean thatthe bacterial products w^ere distinctly beneficial rather than other words, the ratio of the constituents removed fall in the sameregion of the triangle in which are found the cultures in which thegreatest growth occurs, and the region of greater growth is associated ANALYTICAL METHODS AND DETAILED RESULTS. 57 with the greater removal of nitrates, which would hardly be thecase if the bacterial activities had played a prominent i)art in theobserved results other than as above suggested. ANALYTICA
. Some effects of a harmful organic soil constituent . ^; or, if so, it would mean thatthe bacterial products w^ere distinctly beneficial rather than other words, the ratio of the constituents removed fall in the sameregion of the triangle in which are found the cultures in which thegreatest growth occurs, and the region of greater growth is associated ANALYTICAL METHODS AND DETAILED RESULTS. 57 with the greater removal of nitrates, which would hardly be thecase if the bacterial activities had played a prominent i)art in theobserved results other than as above suggested. ANALYTICAL METHODS AND DETAILED After changing the solutions at the end of the tliird day, these,as already stated, were brought to the laboratory for analysis, andthe concentration of nitrate, phosphate, and potassium was deter-mined. The quantities involved are necessarily small and colori- P3,0s. KoO Fig. 29.—Showing the ratios of P20i, NHs, and KjO in the original solutions, those in the solutions after. growth, and those of the loss of the constituents from the solutions, for a clear day. (In this experimentthe solutions were changed and analyzed daily.) metric methods, which had been dc^vised for the (]ct(^rminati()n ofsmall amounts of these substances, in aqueous (wtracts from soils,were used with very satisfactory results. With these methods it waspossible to detect slight differences in concentration, differences sosmall that to have determined them accurately with any of the pres-ent gravimetric or volumetric methods would have been (\The colorimeter used in this v/ork is that described elsewhere. Th(^ Schroinor and Failyer, Bill. 31, }). 25, Bureau of Soils, U. S. Dept. Agr., 1900. Schreiner, Jour. Am. Chem. Soc. 1192 (1905). 58 EFFECTS OF A HAEMFU-L SOIL CONSTITUENT. methods for the nitrate and the phosphate determmations enabledthe completion of the analy
Size: 1703px × 1467px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, bookpublisherwashi, bookyear1910
