Abstracts of Nippon Dojo-Hiryogaku Zasshi 91-02

Vol. 91(2020) No. 2

Original paper

Effect of winter flooding on the soil nitrogen fractions and organic rice growth in a paddy field with low nitrogen fertility

Takanori OOMORI, Satoko YOKOTA^† and Kazuhiko TAKECHI

Ehime Research Institute of Agriculture, Forestry and Fisheries

^†No Belonging

We investigated why winter-flooded, organically cultivated paddy fields have high productivity by conducting field experiments in which winter-flooded (WF) and winter-drained (WD) main plots that each contained no fertilization and standard fertilization subplots were established from 2013 to 2015. We found that the WF treatment significantly increased rice yield and yield components, such as the number of ears, grain number per panicle, and grain number per square meter. Furthermore, the plant height, stem number, and leaf color of the rice were higher with the WF treatment than the WD treatment through most of the growth period. In early spring, a surface layer with a light clay texture formed above the plow layer, which had a sandy loam to sandy clay loam texture. This surface layer was approximately twice as thick in the WF field (1.8–4.2 cm) than in the WD field (0.5–2.2 cm) and contained three to five times higher contents of inorganic+available nitrogen (128–171 mg kg⁻¹), sulfuric acid-extractable nitrogen (68–72 mg kg⁻¹), 1 M NaOH-extractable nitrogen (1729–2078 mg kg⁻¹), and total nitrogen (2859–3301 mg kg⁻¹) than the plow layer, which could be attributed to the movement of the clay fraction from the plow layer to the surface layer. The contents of these nitrogen fractions were not affected by the WF treatment, but the total amount of inorganic+available nitrogen in the entire soil layer was higher in the WF field than in the WD field. Thus, the increased thickness of the surface layer of the WF field combined with the increased available nitrogen content in the surface layer may explain why WF treatment increases the rice yield in paddy fields in southwestern Japan with low nitrogen fertility.

(Jpn. J. Soil Sci. Plant Nutr., 90, 249–256, 2019)

Note

Change in topsoil pore structure of clayey fields with a water table management system in a region with heavy snowfall during a two-year system of the V-furrow no-till direct seeding rice–barley–soybean triple cropping

Katsuhiro SUZUKI, Satoshi OHNO^† and Masahiro SEKI

Division of Lowland Farming, Central Region Agricultural Research Center, NARO

^†Present address: Division of Soil Science and Plant Nutrition, Central Region Agricultural Research Center, NARO

(Jpn. J. Soil Sci. Plant Nutr., 91, 75–79, 2020)

Current Topic

Effect of 10 years successive application of manure and charcoals on yield and soil chemical properties of spinach cultivations in greenhouse field

Mihoko HARADA¹, Heigo KUNITA¹, Hiroyuki NOBUYASU² and Kiminori KURAO¹

¹Prefectural Technology Research Institute Agricultural Technology Research Center

²Hiroshima Prefecture Western Center for Agricultural Technology Guidance

(Jpn. J. Soil Sci. Plant Nutr., 91, 80–84, 2020)

Miscellaneous

Soil and Sustainable Development Goals (SDGs) – Soil in Africa, Urban Soil –

Masami NANZYO¹, Rattan LAL², Masayuki KAWAHIGASHI³, Nobuhiro KANEKO⁴, Hideaki HIRAI⁵, Kazuyuki INUBUSHI⁶ and Yoko YAMAMOTO⁷

¹Tohoku University

²Carbon Management and Sequestration Center, The Ohio State University

³Faculty of urban Environmental Sciences, Tokyo Metropolitan University

⁴Faculty of Food and Agricultural Science, Fukushima Univeristy

⁵ School of Agriculture, Utsunomiya University

⁶ Graduate School of Horticultural Science, Chiba University

⁷Okayama University

(Jpn. J. Soil Sci. Plant Nutr., 91, 85–89, 2020)

Miscellaneous

The gods of soil found in KOJIKI: Records of ancient matters in Japan

Yoshiyuki NARA and Katsuyuki MINAMI

Institute for Agriculture, Medicine, and the Environment

(Jpn. J. Soil Sci. Plant Nutr., 91, 90–93, 2020)

Miscellaneous

Ideal agriculture: Basic research and field technology supporting sustainable and innovative crop production

Keishi SENOO^{1, 2}, Yoko MASUDA¹, Hideomi ITOH³, Michitaka NOTAGUCHI^{4, 5}, Ryo TABATA⁴, Koji OKAYASU⁴, Yu SAWAI⁴, Takamasa SUZUKI⁶, Ken-ichi KUROTANI^{4, 5}, Masako FUJI⁷, Yuniar Devi UTAMI⁷, Yukiko SHIMIZU⁷, Yusuke SAIJO⁷, Yoshihiro OHMORI¹, Toru FUJIWARA¹, Yutaka SHIRATORI⁸ and Sayuri OTA⁸

¹Graduate School of Agricultural and Life Sciences, The University of Tokyo²Collaborative Research Institute for Innovative Microbiology, The University of Tokyo³National Institute of Advanced Industrial Science and Technology (AIST)⁴Graduate School of Bioagricultural Sciences, Nagoya University⁵Bioscience and Biotechnology Center, Nagoya University⁶Graduate School of Bioscience and Biotechnology, Chubu University⁷Division of Biological Science, Graduate School of Science and Technology, Nara Institute of Science and Technology⁸ Niigata Agricultural Research Institute

(Jpn. J. Soil Sci. Plant Nutr., 91, 94–98, 2020)

Miscellaneous

Junta YANAI¹, Yasuhito SHIRATO², Mizuhiko NISHIDA³, Masahiro KASUYA⁴, Rikiya NIRA⁵ and Sota TANAKA⁶

¹Graduate School of Life and Environmental Sciences, Kyoto Prefectural University²Institute for Agro-Environmental Sciences, NARO³ Graduate School of Agriculture, Tohoku University⁴ Aichi Agricultural Research Center⁵ Tohoku Agricultural Research Center, NARO⁶ Faculty of Agriculture and Marine Sciences, Kochi University

(Jpn. J. Soil Sci. Plant Nutr., 91, 99–105, 2020)

Miscellaneous

Now and future of ‘smart’ agriculture in Shizuoka

Akio MORITA¹, Yuhei HIRONO², Yoshikazu KIRIIWA¹, Akihiro SAITO³, Katashi KAI⁴, Makoto KOIKE⁵, Takayuki NAKANO⁶, Masato FUTAGAWA⁷, Kazuyoshi NADA⁸ and Shin HIRATSUKA⁸

¹ Faculty of Agriculture, Shizuoka University² Institute of Fruit Tree and Tea Science, NARO³ Faculty of Science and Technology, Shizuoka Institute of Science and Technology⁴ Agribusiness Department, Shinnippou Ltd.⁵ Cucumber Farmer⁶ Tea Research Center, Shizuoka Prefectural Research Institute of Agriculture and Forestry⁷ College of Engineering, Shizuoka University⁸ Graduate School of Bioresources, Mie University

(Jpn. J. Soil Sci. Plant Nutr., 91, 106–111, 2020)

Miscellaneous

Report on the special lectures by Prof. Kosaki and Prof. Lal at the 2019 Annual Meeting of the Japanese Society of Soil Science and Plant Nutrition in Shizuoka

Junta YANAI¹, Atsunobu KADONO², Junpei TAKANO³ and Kazuyuki INUBUSHI⁴

¹Grad. Sch. Life and Environmental Sciences, Kyoto Prefectural Univ.² Grad. Sch. Environmental Science and Business Administration, Tottori University of Environmental Studies³ Grad. Sch. Life and Environmental Sciences, Osaka Prefecture Univ.⁴ Grad. Sch. Horticulture, Chiba Univ.

(Jpn. J. Soil Sci. Plant Nutr., 91, 112–113, 2020)

Miscellaneous

Report on the activities as the President of the International Union of Soil Sciences

Takashi KOSAKI

Department of Global Liberal Arts, Aichi University

(Jpn. J. Soil Sci. Plant Nutr., 91, 114–116, 2020)

Miscellaneous

Report on ‘Symposium on agricultural practice against soil borne disease’

Naoto KATO

National Federation of Agricultural Cooperative Associations (ZEN-NOH)

(Jpn. J. Soil Sci. Plant Nutr., 91, 117, 2020)

Miscellaneous

Exhibition report of the EcoPro 2019

Taku KATO

Tokyo University of Agriculture, Faculty of Applied Biosciences, Department of Agricultural Chemistry

(Jpn. J. Soil Sci. Plant Nutr., 91, 118, 2020)

Miscellaneous

Report on the 3rd Meeting of SEALNET in Philippines

Takashi KANDA, Yuji MAEJIMA and Yasuhito SHIRATO

Institute for Agro-Environmental Sciences, NARO

(Jpn. J. Soil Sci. Plant Nutr., 91, 119, 2020)