307-7 Silicon Extraction in Fertilizer with Na2CO3 + NH4NO3 in the Autoclave.

Poster Number 2233

See more from this Division: S08 Nutrient Management & Soil & Plant Analysis
See more from this Session: Silicon As a Beneficial Element for Plants
Tuesday, October 23, 2012
Duke Energy Convention Center, Exhibit Hall AB, Level 1
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Hamilton Pereira, Agricultural Sciences Institute, Federal University of Uberlandia, Uberlandia, Brazil, Marcos Humberto Assis, Agronomy Jataí, Federal University of Goias, Jatai, Brazil and Gaspar Korndorfer, Agronomy, University Federal of Uberlandia, Uberlandia, Brazil
Poster Presentation
  • Presentation Poster HS Pereira.pdf (241.2 kB)
  • An extraction method of silicon in slag and fertilizers was developed to quantify the potentially available Si for the plants. The method is based on the solubilization of the Si content materials in an alkaline extractor of Na2CO3 + NH4NO3. This study aimed at evaluating variations in the use of Na2CO3 + NH4NO3 as extractors of Si fertilizers. An experiment completely randomized with the rice culture in a Quartzipsamment soil and in a greenhouse was installed with 18 Si sources applied at a rate of 250 kg ha-1 and a control with four replication. Another experiment was installed in factorial scheme (18 x 5) with 18 Si sources and five extractions of Si fertilizers and three replications in the laboratory. For this study, it was used four extractant solutions: Solution 1: Na2CO3 (0,1 mol.dm-3) + NH4NO3 (0,2 mol.dm-3); Solution 2 - Na2CO3 (0,1 mol.dm-3) + disodium EDTA (0,03 mol.dm-3) + NH4NO3 (0,2 mol.dm-3); Solution 3 - Na2CO3 (0,1 mol.dm-3) + disodium EDTA (0,03 mol.dm-3) + NH4NO3 (0,2 mol.dm-3) + C2Na2O4 (0,06 mol.dm-3) and; Solution 4 - Na2CO3 (0,1 mol.dm-3) + disodium EDTA (0,03 mol.dm-3) + NH4NO3 (0,2 mol.dm-3) + CH3COONH4 (0,1 mol.dm-3). The extractions with 4 solutions were induced by autoclave for 1 h at 120 °C. The solution 1 was also used in an extraction without application of autoclave but with rest of 5 days, thus totaling 5 extractions. The most efficient source for Si release to rice was Wollastonite [Ca3(Si3O3)] followed by phosphorous slag and stainless steel slag, while the schist, blast furnace slag and silicate clay were the lowest on Si release. The autoclave was efficient in increasing the Si extraction, replacing the 5 days rest in the sample in solution. The highest extraction and better correlation between soluble Si and Si uptake by the rice crop was obtained in solutions with EDTA, but solution 2 showed greater extraction capacity of the Si sources.

    See more from this Division: S08 Nutrient Management & Soil & Plant Analysis
    See more from this Session: Silicon As a Beneficial Element for Plants