汎用水田において耕起および不耕起栽培したコムギ,ダイズおよび水稲の根の垂直分布の解析

Translated title of the contribution: Analyses of the Vertical Distribution of Roots in Wheat, Soybean and Rice in Tilled and Non-tilled Multipurpose Paddy Fields

小柳 敦史, 南石 晃明, 土田 志郎, 長野間 宏

Research output: Contribution to journalArticle

Abstract

Wheat and soybean were grown in an upland field converted from a paddy of gray lowland soil in Ibaraki, Japan in 1994-1995.Wheat and rice were also grown in multipurpose paddy fields of peat soil in 1995-1996.Non-tilled and tilled plots were prepared and wheat was sown in autumn.Soil monoliths, 30 cm in width, 5 cm in thickness and 30 cm in depth, were sampled during the late growth stages of the crops.The soil monoliths were divided into 5 cm cubes.Roots were washed and cleaned with water, and lengths measured with a root length scanner.Root length density of 0-5 cm in the depth layer was large in non-tilled fields of soybean and rice.Wheat in the non-tilled field had a smaller root length than that in the tilled field.Root length density of 5-15 cm in the depth layer was relatively small in the non-tilled wheat field.The root depth index(RDI), which showed mean root depth in a root system, was calculated from these data.The RDI of soybean and rice was small for the non-tilled field and large for the tilled field.However, the RDI of wheat was almost the same in both non-tilled and tilled fields.It may be caused by small amount of precipitation in winter.
Translated title of the contributionAnalyses of the Vertical Distribution of Roots in Wheat, Soybean and Rice in Tilled and Non-tilled Multipurpose Paddy Fields
Original languageJapanese
Pages (from-to)49-55
Number of pages7
JournalJapanese Journal of Crop Science
Volume67
Issue number1
Publication statusPublished - Mar 5 1998

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