Oxidation-reduction state in the vicinity of the paddy rice seed sown into flooded soil.

Hagiwara, Motoyuki; Imura, Mitsuo; Mitsuishi, Shozo

doi:10.1626/jcs.56.356

Cited by 7 publications

(6 citation statements)

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“…We also showed that seed coating enhanced shoot elongation during emergence, whereas drainage after sowing promoted it mainly after seedling emergence. Seed coating suppresses the development of soil reduction in the vicinity of the seeds direct-sown into puddled and leveled soil (Hagiwara et al, 1987), but drainage after sowing maintains high oxidation-reduction state in top soil, both in the vicinity of and outside seeds (Tanaka, 2000). Drainage also affects soil properties such as the compositions of three phases in soil and soil hardness (Furuhata et al, 1998).…”

Section: Discussionmentioning

confidence: 99%

Growth Enhancement by Drainage during Seedling Establishment in Rice Direct-Sown into Puddled and Leveled Soil: —Comparison with seed coating with calcium peroxide—

Tsuchiya

Satô

Maruyama

2004

Plant Production Science

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Section: Discussionmentioning

confidence: 99%

Growth Enhancement by Drainage during Seedling Establishment in Rice Direct-Sown into Puddled and Leveled Soil: —Comparison with seed coating with calcium peroxide—

Tsuchiya

Satô

Maruyama

2004

Plant Production Science

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“…Six pots were used for each condition. Methylene blue (1 g kg -1 dried soil) was added to the other unautoclaved pots before shaking, and seeds were sown on the sides for observation because methylene blue is decolorized when the redox potential is below about 0.05 V at pH 6.0 (Hagiwara et al, 1987 ) was added until the total amount of water was 1.5 times the weight of dry soil.…”

Section: Methodsmentioning

confidence: 99%

“…Sulfide ions are generated when the redox potential declines to −0.18 − −0.05 V (Patrick and Jugsujinda, 1992;Marschner, 1995). Hagiwara et al (1987) showed that the redox potential is lower in the near-seed soil than in unseeded soil, using the redox indicator color. They also reported that the lowest redox potential of near-seed soil was about −0.05 V, based on measurements of the redox potential of air-dried soil submerged at 28ºC.…”

mentioning

confidence: 99%

Suppressive Effect of Sulfate on Establishment of Rice Seedlings in Submerged Soil May be Due to Sulfide Generation around the Seeds

Hara

2013

Plant Production Science

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Direct seeding is a labor-saving rice cultivation method, but poor establishment is a major obstacle to the widespread use of this practice. This study examined the suppressive effect of ammonium sulfate, a nitrogen fertilizer, on seedling establishment in submerged soil. Establishment was impaired even at 20ºC by the application of sulfate salts, including ammonium sulfate and potassium sulfate, but not by ammonium chloride. Impairment by ammonium sulfate did not occur in autoclaved soil. In addition, the redox potential in the soil near the seeds decreased rapidly to levels that allowed sulfide ion generation, even at 20ºC. The sulfur concentration in the soil near the seeds decreased with the decline in redox potential, suggesting that sulfide ions were transformed from soluble sulfate ions into insoluble iron sulfide through binding with ferrous ions near the seeds. These results imply that sulfate ions may be transformed into sulfide ions by bacteria only around the seeds if sufficient sulfate ions are present in the soil, thereby impairing the establishment of seeds sown directly in submerged soil, even under cool springtime conditions and in paddy fields that do not dry out prior to submergence.

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“…Circular black stains, which may be iron sulfides (Kumada, 1949;Hagiwara et al, 1987), appeared near the seeds only when the amount of potassium molybdate applied was no more than 1.5 mmol kg -1 (Fig. 4).…”

Section: Effect Of Molybdenum On Soil Redox Potentials (Exp 3)mentioning

confidence: 99%

“…Circular black stains that appeared near the seeds were likely iron sulfides (Kumada, 1949;Hagiwara et al, 1987). The appearance of the stains implied the generation of sulfide ions.…”

Section: Molybdate Improves Establishmentmentioning

confidence: 99%

Improvement of Rice Seedling Establishment in Sulfate-Applied Submerged Soil by Application of Molybdate

Hara

2013

Plant Production Science

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Sulfide ion generation in strictly reduced soil might be a factor impairing rice seedling establishment. The molybdate ion is known to suppress the microbial transformation of sulfide ions from sulfate ions. I investigated the effect of molybdate on rice establishment in sulfateapplied submerged soil. The establishment of rice seeds sown in sulfate-applied submerged soil was markedly improved by application of potassium molybdate at a rate of 1.5−15 mmol kg -1 dried soil. The application of potassium molybdate delayed the decline of the sulfur concentration in the soil solution near the seeds and the appearance of circular black stains, or insoluble iron sulfide indicating the generation of sulfide ion, around seeds in the soil. Irrespective of the application of molybdate, the redox potential near the seeds was low enough to allow generation of sulfide ions, implying that molybdate suppresses the generation of sulfide ions with no effect on redox potential. These results suggest that the application of molybdate could improve rice seedling establishment in sulfur-rich submerged soil by suppressing the generation of sulfide ions, that is a possible factor suppressing the establishment of rice seeds sown in sulfur-rich submerged soil.

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Oxidation-reduction state in the vicinity of the paddy rice seed sown into flooded soil.

Cited by 7 publications

References 0 publications

Growth Enhancement by Drainage during Seedling Establishment in Rice Direct-Sown into Puddled and Leveled Soil: —Comparison with seed coating with calcium peroxide—

Growth Enhancement by Drainage during Seedling Establishment in Rice Direct-Sown into Puddled and Leveled Soil: —Comparison with seed coating with calcium peroxide—

Suppressive Effect of Sulfate on Establishment of Rice Seedlings in Submerged Soil May be Due to Sulfide Generation around the Seeds

Improvement of Rice Seedling Establishment in Sulfate-Applied Submerged Soil by Application of Molybdate

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