Measurement of Si adsorption and ''active Si'' in a soil amended with slag fertilizers by using stable isotope Si-30

作     者：Kato, N Yanagisawa, K Owa, N 

作者机构：CHUO UNIVFAC SCI & ENGNBUNKYO KUTOKYO 112JAPAN 

出 版 物：《SOIL SCIENCE AND PLANT NUTRITION》 (土壤科学与植物营养学)

年 卷 期：1997年第43卷第3期

页      面：623-631页

核心收录：

学科分类：0710[理学-生物学] 0830[工学-环境科学与工程（可授工学、理学、农学学位）] 09[农学] 0903[农学-农业资源与环境] 

主　　题：adsorption available Si isotopic dilution silicon slag 

摘      要：The silicic acid adsorption by a soil (Eutric Gleysols) where slag fertilizers were applied was measured by the addition of a silicic acid solution labelled with Si-30 after soil incubation, in order to study the effect of slag application on the specific Si adsorption by the soil and to estimate the amount of Si in the soil solid phase which can easily enter the soil solution, It nas evident that the application of slags increased the ability of soil to adsorb Si, It was also shown that the Si-30 added was diluted with not only the Si present in the soil solution but also the Si dissolved from the soil solid phase, We proposed the use of the term active for Si in soil which can take part in the isotopic dilution within 1 h, The amount of active Si in the soil solid and liquid phases (D-60-value) was calculated from the Si-30 content in the soil solution and compared with the amount of Si taken up by rice plant (Oryza sativa L.), which was determined in our previous study, The buffering capacity of the soil for Si, which can reflect the ability of soil to maintain the Si concentration in the soil solution constant when Si is added to or removed from the soil, was also determined. The D-60-value and the Si buffering capacity of the soil increased by slag application, These increases were large when the alkalinity of the applied slags was high, The correlation study revealed that the D-60-value was a better index of Si availability of the soil than the amount of Si dissolved from the soil solid phase during the incubation when the slags were previously applied.