ITO Toyoaki

SAITO Masanori

TAJIMA Ryosuke

UNO Toru

WATANABE Tomohiro

English

紀要類（bulletin）Poster Sessionsdepartmental bulletin pape

WATANABE, Tomohiro

UNO, Toru

TAJIMA, Ryosuke

ITO, Toyoaki

SAITO, Masanori

Tohoku University Repository (TOUR) / 東北大学機関リポジトリ

The Relationship Between Deep Rooting andNitrate Leaching of Wheat in Subsoil Acidity著者 WATANABE Tomohiro, UNO Toru, TAJIMA Ryosuke,ITO Toyoaki, SAITO Masanorijournal orpublication titleJournal of Integrated Field Sciencevolume 15page range 91-91year 2018-10URL http://hdl.handle.net/10097/00124032 91Poster Sessionp16. The Relationship Between Deep Rooting and Nitrate Leaching of Wheat in Subsoil AcidityTomohiro WATANABE, Toru UNO, Ryosuke TAJIMA, Toyoaki ITO and Masanori SAITOGraduate School of Agricultural Science, Tohoku University, JapanNitrogen, the most important nutrient in crop production, exists as mainly nitrate (NO3-N) in the arable field. NO3-N easily moves to the topsoil and, when it leaches into groundwater, has a negative impact on water quality and increases indirect N2O emissions. Wheat, which is one of the staple crops in the world and increasing the production in Japan can use NO3-N not only in the topsoil but also in the subsoil. Therefore, wheat should enhance crop production and reduce NO3-N leaching if wheat could use more NO3-N in the subsoil. However, rooting to the subsoil in the wheat could be severely suppressed under acidic soil, especially in Andosols, which is one of the major soil types in Japan. In this study, we tested the relationship between rooting to the subsoil and NO3-N leaching of wheat in the Andosols.We cultivated four common (AU49, Harukirari, Haruyokoi, Shirogane) and one spelt wheat genotypes in the pot filled with thick high humic nonallophanic Andosols. The pot consisted of the topsoil and the subsoil parts. All the topsoil parts were limed for neutralizing soil acidity and the subsoil parts were set up in the two treatments: liming and no liming. We irrigated and collected the leaching water from the bottom of the pot every two weeks. At harvesting (80 days after seeding), we harvested aboveground parts of wheat and carefully washed the roots from the soil for the estimation after the soil was divided into two layers. In addition, NO3-N concentration in the soil was measured. The grain yield, shoot and root dry weights were more surpassed in the liming treatment than that in the no liming treatment in all the tested wheat genotypes. With liming, NO3-N concentration in soil represented lower than that with no liming in the subsoil. NO3-N concentration in the leaching water also tended to be low in the liming treatment though it was different in five wheat genotypes. Spelt wheat showed the highest root length density and the lowest NO3-N concentration with no liming in the subsoil while the plant growth of AU49 and Harukirari were limited and NO3-N concentration tended to be high in the subsoil acidity. These results suggested the subsoil acidity could be one of the important factors in limiting crop production increasing NO3-N leaching. The trait of deep rooting ability of wheat under subsoil acidity could be an effective solution to take up NO3-N linking to both lower the crop production and NO3-N leaching.

The Relationship Between Deep Rooting and Nitrate Leaching of Wheat in Subsoil Acidity

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The Relationship Between Deep Rooting and Nitrate Leaching of Wheat in Subsoil Acidity

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