Relationships between available zinc and its fractions in the presence of vermicompost
A field experiment was conducted to study the role of vermicompost (VC) in the availability of zinc (Zn) in rice soil by Zn incubated with verrnicornpost at ratios of 1:10, 1:20 and 1:30. Experimental result indicated that available form (DTPA-Zn) and all species of Zn were progressively increased at lower level of Zn (2.5kg/ha) in combination with vermicompost at ratios of 1:10 to 1:30. In many cases, cornplexation of organic Zn with organic ligands resulted in decreased adsorption on mineral colloids. The highest value of available Zn is recorded in 1:10 ratio of Zn enriched with verrnicompost due to the formation of water soluble (WS), organically complexed (OC) and manganese oxide bound (MnO<2>) Zn species. Among the different species of Zn the highest value was recorded in the form of MnO<2>, followed by OC, amorphous sesquioxide bound (AMR<2>O<3>), crystalline sesquioxide bound (CRYR<2>O<3>) and WS fractions. The present study indicated that Zn (5kg/ha) incubated with vermicornpost (50kg/ha) (1:10) fertilizer promotes the availability of DTPA-Zn in submerged soils.
DTPA-extractable Zn verrnicornpost zinc
Kannan, p Mani, S
Department of Soil Science & Agricultural Chemistry, Tamil Nadu Agricultural University, Coimhatore 641 003 INDIA
国际会议
第九届痕量元素生物地球化学国际会议(9th International Conference on the Biogeochemistry of Trace Elements)
北京
英文
906-907
2007-07-15（万方平台首次上网日期，不代表论文的发表时间）