This paper summarizes the theory of the chemical and physical properties of Si, soil classification for Si soil test and Si fertilizer types, effect of Si fertilizer on plant and soil etc., and proves that Si fertiliz...This paper summarizes the theory of the chemical and physical properties of Si, soil classification for Si soil test and Si fertilizer types, effect of Si fertilizer on plant and soil etc., and proves that Si fertilizer can increase the P nutrition, yield and quality, resistance to any biotic and abiotic stress ability, reduce the toxici- ty of heavy metals of plants and improve the water fertilizer retention of soil by practice; also points out that the best source for Si fertilizers is natural rich Si ma- terials. At last, it gives the prospection about the application of Si fertilizer in the sustainable and organic agriculture.展开更多
This study deals with the pre-treatment of coal fly ash (CFA) by using alkaline substance to improve water solubility of Si which in turn readily available to the plants. Selected weight ratios of CFA/NaOH (s:s) were ...This study deals with the pre-treatment of coal fly ash (CFA) by using alkaline substance to improve water solubility of Si which in turn readily available to the plants. Selected weight ratios of CFA/NaOH (s:s) were tested and the highest H<sub>4</sub>SiO<sub>4</sub> yield ratio was selected for further study. X-ray diffraction and scanning electron microscopy analyses were performed to confirm the evidence of structural changes of the CFA upon alkaline treatment. To improve SiO<sub>2</sub> dissolution, seven Si-solubilizing fungi, <em>i.e.</em>, <em>Aspergillus niger</em> BCC194, <em>A</em>. <em>niger</em> K0909, <em>A</em>. <em>niger</em> A1601, <em>Trichoderma polysporum</em>, <em>T</em>. <em>viride</em>, <em>T</em>. <em>pseudokoningii</em>, and <em>Trichoderma</em> spp, were each inoculated onto pre-treated ash. The results indicated that the relationships between ratio of CFA/NaOH and total and soluble Si were linier (R<sup>2</sup> = 0.97** and 0.96**, respectively). Total SiO<sub>2</sub> values range from 10.43% to 13.02%, whereas soluble Si contents were 2.30% - 2.64% improved about 300 times compared to un-treated CFA. Both XRD and SEM analyses indicated that alkaline treatment to CFA caused particle damages resulting in increasing soluble Si. Inoculation of pre-treated CFA by <em>T</em>. <em>polysporum</em> up to twelve days of incubation yielded the highest soluble Si. Each fungal species grown on Bunt & Rovira solid media enriched with CFA as Si-source expressed significantly different ability in solubilizing Si from CFA. Citric acid was shown to be stronger compared to acetic and oxalic acids in solubilizing Si from CFA.展开更多
基金Supported by Major Program of China Hunan Provincial Science and Technology Department (2011wk3019)~~
文摘This paper summarizes the theory of the chemical and physical properties of Si, soil classification for Si soil test and Si fertilizer types, effect of Si fertilizer on plant and soil etc., and proves that Si fertilizer can increase the P nutrition, yield and quality, resistance to any biotic and abiotic stress ability, reduce the toxici- ty of heavy metals of plants and improve the water fertilizer retention of soil by practice; also points out that the best source for Si fertilizers is natural rich Si ma- terials. At last, it gives the prospection about the application of Si fertilizer in the sustainable and organic agriculture.
文摘This study deals with the pre-treatment of coal fly ash (CFA) by using alkaline substance to improve water solubility of Si which in turn readily available to the plants. Selected weight ratios of CFA/NaOH (s:s) were tested and the highest H<sub>4</sub>SiO<sub>4</sub> yield ratio was selected for further study. X-ray diffraction and scanning electron microscopy analyses were performed to confirm the evidence of structural changes of the CFA upon alkaline treatment. To improve SiO<sub>2</sub> dissolution, seven Si-solubilizing fungi, <em>i.e.</em>, <em>Aspergillus niger</em> BCC194, <em>A</em>. <em>niger</em> K0909, <em>A</em>. <em>niger</em> A1601, <em>Trichoderma polysporum</em>, <em>T</em>. <em>viride</em>, <em>T</em>. <em>pseudokoningii</em>, and <em>Trichoderma</em> spp, were each inoculated onto pre-treated ash. The results indicated that the relationships between ratio of CFA/NaOH and total and soluble Si were linier (R<sup>2</sup> = 0.97** and 0.96**, respectively). Total SiO<sub>2</sub> values range from 10.43% to 13.02%, whereas soluble Si contents were 2.30% - 2.64% improved about 300 times compared to un-treated CFA. Both XRD and SEM analyses indicated that alkaline treatment to CFA caused particle damages resulting in increasing soluble Si. Inoculation of pre-treated CFA by <em>T</em>. <em>polysporum</em> up to twelve days of incubation yielded the highest soluble Si. Each fungal species grown on Bunt & Rovira solid media enriched with CFA as Si-source expressed significantly different ability in solubilizing Si from CFA. Citric acid was shown to be stronger compared to acetic and oxalic acids in solubilizing Si from CFA.
