ウレタンと土壌の硝化作用

石沢
1956 Japanese Journal of Soil Science and Plant Nutrition  
Effect of organic acid exuded frQm crop r 。 ots , up 。 n mineraliz ・ ti・ n ・ f ・ ・ganlc ph ・ sph ・ rus i 臓 soils were investig 艮 ted th 三 s time , and the results were as fellowli : ・ 1 , Crop roots , especially theircaps , were observed to liberate cont 三 nuously their surface ce1 ! s into culture ・ solution ( Photo.1and 2 ) . Rate of this liberation was so different with respect to plants as 量 n the f・ 11 。 wing order , Gramineae 》 L ・ guminosae > Sotana ・ ' eae . 2 . By paper chromatography
more » ... per chromatography , cell sap of . roots was recognlzed to cantain organic acids , such as oxalic acid , succinic ac 董 d , malic acid , tartaric acid and citric acid . By the sam6 chromategraph ア, oxalic acld was traceable and tartaric acid as well as citric acid were found in a small amount in ether extract from nutrient solution , in wh 量 ch a large number of sweet potato shoot had been culture 乱 3. Na sa 互 ts of α 一 〇 xyacid ( tartaric and citric ac 三 ds ) , when added to soi1 , 三 ncTeased the solubi1 ... ty of organic phosphorus , er 三 ginally contained in, and newly added to , the so 呈 1, This increase was mainly due to the solvent action of oxyacids but not due t〔 } the change of pH of the soi1 ( Table 2 a 皿 d Fig.1). 4 . Addition of oxyacids to so 玉 1 prolnoted the mineralization of organic phosphorus , when the soil was incubated , This promGtion was considered tQ be caused by the increased solubility of organic phospherus due to addit 三 〇 n of oxyacid and by the increased pH of soil and , at the sa 皿 e time by the accelerated activity of soil microbes bア the supply Qf new carbon source ( Tabie 3 and F三 g . φ 2 ) .
doi:10.20710/dojo.26.11_444_1 fatcat:uemmmosg4vczxmwnxnpgq35lju