Rapid, Micro-Methods to Estimate Plant Silicon Content by Dilute Hydrofluoric Acid Extraction and Spectrometric Molybdenum Method

Saito, Kimio; Yamamoto, Akiko; Sa, Tongmin; Saigusa, Masahiko

doi:10.1111/j.1747-0765.2005.tb00003.x

Cited by 55 publications

(39 citation statements)

References 5 publications

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“…The total N concentration of the rice straw was determined using the same method as that used for soil analysis. The Si concentration of the straw, RC, and RH was determined using gravimetric analysis, as described by Saito et al (2005). The rice straw from the 2nd year's harvest, RC, and RH were digested in a mixture of sulfuric acid (H 2 SO 4 ) and hydrogen peroxide (H 2 O 2 ) in order to measure potassium (K), calcium (Ca), and magnesium (Mg) concentrations using an atomic absorption photometer (Z-2300; Hitachi High-Technologies Corp., Tokyo, Japan).…”

Section: Physicochemical Analysis Of Soil Rc and Rhmentioning

confidence: 99%

Rice yield and soil carbon dynamics over three years of applying rice husk charcoal to an Andosol paddy field

Koyama¹,

Hayashi

2017

Plant Production Science

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a overseas agricultural development association, tokyo, Japan;b Faculty of life and environmental Sciences, university of tsukuba, tsukuba, Japan ABSTRACT Rice husk charcoal (RC) produced from the pyrolysis of rice husk (RH) can be one of the cost-effective biochars for use in rice-based farming systems. This study investigated changes in rice yield and soil carbon sequestration over three years of RC application to an Andosol paddy field. The treatments were RC application at 0.02, 0.2, and 2 kg m −2 (RC0.02, RC0.2, and RC2, respectively), RH application at 0.2 kg m −2 (RH0.2), and a control with no RC or RH application (CONT). The results showed that RC2 increased culm length by 4% and straw weight by 14% on average over the three years. These increases in plant growth coincided with a higher level of silicon uptake by the rice plants, although they did not significantly affect grain yield. The soil carbon content was progressively increased by RC2 over the three years, whereas it was not significantly affected by RC0.02 or RC0.2. A considerable amount (>72%) of the applied carbon with RC2 remained in the soil by taking account of its downward movement below the 10 cm layer of the paddy field after three consecutive years of RC application. We conclude that rice husk charcoal application to Andosol paddy fields is an effective option for increasing carbon sequestration. Furthermore, the increase in silicon uptake by rice plants suggests that rice husk charcoal can also be functioning as a silicon fertilizer.

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Section: Physicochemical Analysis Of Soil Rc and Rhmentioning

confidence: 99%

Rice yield and soil carbon dynamics over three years of applying rice husk charcoal to an Andosol paddy field

Koyama¹,

Hayashi

2017

Plant Production Science

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“…The N content was determined using an NC analyzer (Sumigraph NC-220F; Sumika Chemical Analysis Service, Osaka Japan). Si was solubilized using dilute hydrofluoric acid extraction, and determined using the molybdenum colorimetric method 16 . The concentrations of P, K, Ca, Mg, Mn, Fe, Zn, and Cu were determined using inductively coupled plasma (ICP) (ICPE-9000; Shimadzu, Kyoto, Japan), after digestion with a mixture of nitric acid and hydrogen peroxide using a microwave digester (MlS 1200 mega; Milestone, Sorisole, Italy).…”

Section: Nutrient Measurement In Plantsmentioning

confidence: 99%

Combined Effects of the Continual Application of Composted Rice Straw and Chemical Fertilizer on Rice Yield under a Double Rice Cropping System in the Mekong Delta, Vietnam

Watanabe

Luu

Nguyen

et al. 2013

JARQ

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We conducted a 12-year field experiment to study the combined effects of rice straw compost and chemical fertilizer application on a double rice cropping system in the Mekong Delta, Vietnam and established 7 treatments using a randomized block design with 3 replications. We calculated the yields of treatments relative to those of conventionally fertilized plots (i.e. with no added rice straw compost), and analyzed their annual trends. In the plots with rice straw compost, we observed a positive trend over 12 continuous wet cropping seasons. In comparison with conventional fertilization, the application of rice straw compost with reduced chemical fertilizer can maintain rice productivity over a longer period. We analyzed the nutrient status of the rice straw at harvest over 4 cropping seasons and observed that the Si concentration of the rice straw in conventionally fertilized plots was significantly lower than that in the plots where rice straw compost was applied. The N, P and Mg concentrations of the rice straw increased with the fertilizer application rate, while the concentrations of K, Ca, Mn, Fe, Zn, and Cu did not differ significantly among treatments. Our results suggest that continuous removal of rice straw may reduce the Si availability in soil, thereby decreasing rice productivity. In addition, we verified that rice straw compost can be an effective source of silicon for paddy rice.

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“…The rice seedlings grown in the presence of 5 mM silicon contained higher content of silicon (12 mg/g) than the control (2 mg/g). The silicon contained in the control originates from the seed which was reported to contain a significant amount of silicon 16,23 . More than 80% of silicon present in rice seedlings are localized in AIR fractions.…”

Section: Resultsmentioning

confidence: 99%

Aqueous Macromolecules with Silicon from Alcoholinsoluble Residues of Rice Seedlings

Ishii

Matsunaga

2008

JARQ

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Rice (Oryza sativa) seedlings were grown in the presence of 5 mM orthosilicic acid (H 4 SiO 4 , IUPAC name: tetrahydroxyl silane). More than 80% of silicon absorbed in the rice was localized in the alcoholinsoluble residues (AIR) fractions. AIR refers to cell wall materials in the text. Driselase (commercial cell wall hydrolyzing enzyme preparation) released 3% of silicon present in the rice AIR into water-soluble fractions. Size-exclusion high performance liquid chromatography/inductively coupled plasma atomic emission spectroscopy (HPLC/ICP-AES) showed that an aqueous silicon-containing substance with high molecular weight was present in the water-soluble fractions. The compounds were stable at pH 6.5, while commercial silica sols which were stable at pH 9.0 were insoluble at the neutral pH. The stability in neutral pH may be due to the presence of a complex of polysaccharide and protein in the molecule. These results imply that silica-containing macromolecules exist in rice cell walls.Discipline: Soil, fertilizer and plant nutrition Additional key words: cell walls, HPLC/ICP-AES, Oryza sativa, silicon JARQ 42 (3), 181 -186 (2008)

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Rapid, Micro-Methods to Estimate Plant Silicon Content by Dilute Hydrofluoric Acid Extraction and Spectrometric Molybdenum Method

Cited by 55 publications

References 5 publications

Rice yield and soil carbon dynamics over three years of applying rice husk charcoal to an Andosol paddy field

Rice yield and soil carbon dynamics over three years of applying rice husk charcoal to an Andosol paddy field

Combined Effects of the Continual Application of Composted Rice Straw and Chemical Fertilizer on Rice Yield under a Double Rice Cropping System in the Mekong Delta, Vietnam

Aqueous Macromolecules with Silicon from Alcoholinsoluble Residues of Rice Seedlings

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