Bulletin of The Iwate Agricultural Research Center No.10
|The distribution of Viola L. in rural area of Iwate Prefecture and the influence of the difference of management on the population density of Viola spp.|
| There were eight species of Viola L. (V.rossii, V.rostrata var.japonica, V.kusanoana, V.grypoceras, V.obtusa,
V.mandshurica, V.betonicifolia var.albescens andV.verecunda) present in rural area of Iwate Prefecture inland part. A species composition
was different in five types of landscapes (Forest floor on the hill zone,
Forest edge on the foot hill, Forest edge by the farm pond, Farm pond-side
grassland and Paddy-side grassland). A species composition seemed to change
corresponding to the light factor and soil moisture of the landscape.
At the abandoned paddy-side grassland and the abandoned farm pond-side grassland, the frequency and an individual density by the ocular estimation of Viola spp. was very low in comparison with either grassland that continuous grass-cutting management. The stop of the grass-cutting and the water management caused the decline of the species diversity. It seems that continuous cultivation and grass-cutting management must be maintained to sustain specific density of Viola spp. At the improved farm pond-grassland, the number of the species of Viola spp. was a few than that in the traditional farm pond-grassland, but the frequency and an individual density was equally in comparison with paddy-side grassland that continuous grass-cutting management. It thought about the environmental heterogeneity of the farm pond, such as forest edge, with the cause that a species diversity was being maintained.
|Field Introduction Techniques of Crabapple Varieties for Pollination|
|Tsukasa TAKAHASHI , Hiroaki TAMURA , Hitoshi SASAKI and Tomonori ASAKAWA|
|The purpose of this research is the development of efficient field introduction techniques of crabapple varieties for pollination into an apple orchard consisting of a single cultivar. We examined several pollination methods: introducing large, pot-raised nursery stock, top working, and combining several kinds of rootstocks with crabapple varieties. The result of these experiments was that commercial variety trees produced fruit when trained large nursery stock raised in biodegradable pots were combined with a single cultivar in the apple orchard. We found that top working was effective when the graft was introduced to the crown of the tree, resulting in improved fruit and seed production in commercial varieties. When selecting suitable crabapple varieties for pollination with main rootstocks, we learned that the JM7 rootstock was effective.|
|Breeding of a New Rice Variety "Tsubuyutaka"|
|Akira ABE, Hiromi SUGAWARA, Tsutomu SASAKI, Masato TAKAKUSAGI, Hiroko NAKANO, Yutaka KIUCHI, Kazuhiko TAMURA, Shinsuke NAKAJO, Masahiro TAKAHASHI, Hiroya ODANAKA, Yoshiaki OGI, Shigeru OGATA, Yoshiaki TERUI, Takashi SATO and Yoshinori KAMIYAMA|
| A new paddy rice variety "Tsubuyutaka" was developed by Iwate
Agricultural Research Center in 2009. The variety was selected from the
cross between "Ko70" and "Fukuhibiki" conducted in
1994 by the ex-Kennan branch of Iwate Agricultural Experiment Station.
This variety was intended as a high grain-yielding variety with cold tolerance
at the booting stage and panicle blast resistance.
"Tsubuyutaka" has been tested as a local line number "Iwanan29" since 2001. It was registered as a new rice variety in Iwate Prefecture in 2009 for its uses as feed grain, production of rice flour, etc.
Characteristics of "Tsubuyutaka" are as follows:
|Breeding of a New Rice Variety "Tsubuminori"|
|Hiromi SUGAWARA, Akira ABE, Masato TAKAKUSAGI, Tsutomu SASAKI, Shinsuke NAKAJO, Yutaka KIUCHI, Hiroko NAKANO, Kazuhiko TAMURA, Yoshiaki OGI, Shigeru OGATA, Hiroya ODANAKA and Yoshinori KAMIYAMA|
| A new paddy rice variety "Tsubuminori" was developed by Iwate
Agricultural Research Center in 2009.The variety was selected from the
cross between "Hokuriku 188" and "Iwanan 20" conducted
in 1996 at the ex-Quality Rice Breeding & Cultivation Research Section
of Iwate Agricultural Reseach Center (Esashi-ku, Oshu City),and was intended
as a middle-maturing variety with cold weather tolerance and high yield.
Since 2003, it was given a performance test and other specific tests.
"Tsubuminori" has been tested as local line number "Iwate 85" since 2006. Registration as a new rice variety of Iwate Prefecture was applied for in 2009.
Characteristics of "Tsubuminori" are as follows: