| 1. |
Water extractable organic matter from air-dry soil to predict soil carbon dynamics. |
| 2. |
Soil carbon dynamics revealed by radiocarbon. |
| 3. |
Challenge for building a carbon sequestration model for Japanese Andosols.. |
| 4. |
Hirohiko NAGANO, Mariko ATARASHI-ANDOH, Sota TANAKA, Syuntaro HIRADATE, Kazumichi FUJII, Jun KOARASHI, Rewetting Dried Soils for Elucidating SOM Dynamics in Andic Soils of a Japanese Temperate Forest., 8th International Symposium on Soil Organic Matter "SOM 2022", June 26-30th, 2022, Seoul, Korea, 2022.06. |
| 5. |
Jithya Nawodi Wijesinghe, Jun Koarashi, Mariko Atarashi-Andoh, Yoko Saito-Kokubu, Noriko Yamaguchi, Takashi Sase, Mamoru Hosono, Yudzuru Inoue, Yuki Mori, Syuntaro Hiradate., The rate of vertical translocation of soil organic carbon fractions stored in a buried humic horizon from an Andosol., 日本土壌肥料学会, 2019.09, 火山灰土壌中の土壌有機物はほとんど下方へは移動しないことを明らかにした。このことから、火山灰土壌の厚い黒色腐植層は、累積的に積層することによって生成したことが明らかになった。. |
| 6. |
Jithya Nawodi Wijesinghe, Jun Koarashi, Mariko Atarashi-Andoh, Yoko Saito-Kokubu, Noriko Yamaguchi, Takashi Sase, Mamoru Hosono, Yudzuru Inoue, Yuki Mori, Syuntaro Hiradate., Transition of soil organic carbon in a volcanic ash soil derived from Towada volcano, Japan., 日本地球惑星科学連合2019年大会, 2019.05. |
| 7. |
Jun Koarashi, Mariko Atarashi-Andoh, Shigehiro Ishizuka, Syntaro Hiradate, Yoko Kokubu., Quantitative understanding of the heterogeneity of soil organic carbon degradability for predicting long-term response of soil carbon to warming., ILTER Annual Coordinating Committee Meeting side-by-side with ILTER EAP scientific conference, 2018.10. |
| 8. |
Influence of light quality on allelopathic effects of asparagus through aseptic bioassay. |
| 9. |
Cyanamide-biosynthesizing organ in hairy vetch Vicia villosa subsp. varia
Cyanamide (NH_2CN) has been isolated from hairy vetch Vicia villosa subsp. varia as a natural product for the first time. We have already clarified that the cyanamide content in hairy vetch seedlings cultivated in the growth chamber reaches its maximum at 3-4 week. The present study aims at elucidating the organ in which cyanamide is biosynthesized. The cyanamide contents in the leaves, the stems, and the roots of 4-week-old seedlings were 629 ± 209, 256 ± 134, and N incorporation into cyanamide in the whole aerial parts to that in the apical portion including the younger leaves. The ^^N isotope abundance ratio in the isolated cyanamide was 3.99 ± 0.61% (average ± SE) when the whole aerial parts was incubated with ^^N-labeled nitrogen sources, which was significantly higher than that of control (0.28 ± 0.03%). In contrast, the cyanamide isolated from the apical portion was not ^^N-labeled on the same condition. These results imply that cyanamide is biosynthesized in the mature leaves.. |
| 10. |
Aseptic bioassay for estimation of asparagus allelopathic effects toward asparagus seeds. |
| 11. |
Varietal differences in allelopathic effects of asparagus seedlings. |
| 12. |
SASAMOTO Hiromi, SUGANO Mami, HIRADATE Syuntaro, FUJII Yoshiharu, YOSHIMATSU Kayo, KAMADA Hiroshi, Allelopathic effect of transformed and non-transformed Atropa belladonna as a model of medicinal plants, Journal of plant research, 2006.12. |
| 13. |
Incorporation of Labeled Nitrate into Cyanamide in Hairy Vetch Vicia villosa
Cyanamide (NH_2CN) has been industrially produced in large quantities for a long time. We have isolated cyanamide as a plant growth inhibitor from hairy vetch Vicia villosa. Although we excluded the possibility that the cyanamide isolated was an unexpectedly contaminating agrochemical, the details of its biosynthesis remain unknown because this compound has never been considered as a natural product. In this report we demonstrate the de novo production of cyanamide in this legume using a ^N-labeled nitrogen source. The extracts of the seedlings of V. villosa grown with and without (^N)nitrate were purified chromatographically to give cyanamide, respectively. On the basis of the GC/MS analyses, the isotopic ratio ^N/(^N+^N) of the ^N-enriched cyanamide was calculated to be 0.143, while that of the non-enriched cyanamide was 0.0065. We also measured the mass spectrum of dicyandiamide [NH_2C(=NH)NHCN], a dimmer of cyanamide, prepared from the purified cyanamide. The isotopic ratio was 0.138, corresponding well to the result of the GC/MS analysis of cyanamide. From these observations, the incorporation of the nitrogen atom of nitrate into cyanamide has been established. We conclude that cyanamide is de novo biosynthesized in V. villosa.. |
| 14. |
Soil Components in Molecular Level and Nano-Scale Interactions among the Components. |
| 15. |
MA Jian Feng, HIRADATE Syuntaro, NOMOTO Kyosuke, MATSUMOTO Hideaki, IDENTIFICATION OF AL FORM IN LEAVES OF Hydrangea macrophylla, Plant and cell physiology, 1997.03. |
| 16. |
Mineralogical and chemical specificity of Andisols in adsorption of pesticide onto soils - The comparison of Andisols and non-Andisols using 2, 4-dichlorophenoxyacetic acid -. |
| 17. |
Katsutoshi Nishino, Misao Shiro, Ryuki Okura, Kazuya Oizumi, Toru Fujita, Takahiro Sasamori, Norihiro Tokitoh, Akiyoshi Yamada, Kaya Matsubara, Chihiro Tanaka, Muneyoshi Yamaguchi, Syuntaro Hiradate, and Nobuhiro Hirai, The (oxalato)aluminate complex as an antimicrobial substance protecting the “shiro” of Tricholoma matsutake from soil microorganisms., ISCE/APACE meeting. |
