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 SENOO1, 2, Yoko MASUDA1, Hideomi ITOH3, Michitaka NOTAGUCHI4, 5, Ryo TABATA4, Koji OKAYASU4, Yu SAWAI4, Takamasa SUZUKI6, Ken-ichi KUROTANI4, 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)