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Virus Disease of Lily in Miyagi Prefecture and The Property of Its Causal Viruses
Hidenori SATO and Shigeo NAKAMURA



Field surveys of virus diseases of lilies in Miyagi prefecture have been done from 1999 to 2001. Lily mottle virus (LMoV), Lily symptomless virus (LSV) and Cucumber mosaic virus (CMV) were commonly found. We isolated these viruses from infected lilies and investigated their host range. LMoV-ML61 or LSV-ML112 infected plants of the only Liliaceae, while CMV-ML126 infected plants of 11 families. Moreover, coat protein genes of ML61, ML112 and ML126 have been sequenced and analyzed. The results showed that ML61 and ML112 have respectively high homology with overseas isolates of LMoV and LSV, and ML126 was belonged to subgroup I of CMV.

Ecological Character of Oenanthe javanica (Blume) DC.
Ryuko ENDO



The ecological characteristics of Oenanthe javanica DC. were investigated under natural conditions. Though several differences were observed among the strains, runners occurred vigorously in all strains from mid to late in May. Internodes began to elongate in the early to middle of May, and buds appeared from mid to late July. When the O. javanica plants grown under natural conditions were transferred to a light breaking greenhouse from November to February every month, the occurrence of runners and internode elongation were observed at all times. These findings indicated that O. javanica plants have no dormancy. However, low temperature treatment would have any influences on occurrence of runner and internode elongation, since they were facilitated by low temperature treatment. Some strains were cultivated and harvested in September and December. Cold injury was observed only in‘Sendai-kei’among the strains harvested in December. Among the strains of‘Simane-midori’,‘S-17-1’was thought to be suited to harvesting in September because its internode elongation was late and anthocyanin did not appear in the leaves and petioles. ‘S-10-5’was thought to be suited to harvesting in December because the number of runners were fewer than other strains and anthocyanin did not appear in the leaves and petioles.

Forcing Culture of‘Satinoka’and‘Totiotome’Strawberries by using Cell Plants.
Hiroshi KANO and Ko ONUMA



As main varieties of strawberry for forcing culture in miyagi prefecture became‘Satinoka’and‘Totiotome’instead of‘Nyohou’, in order to establish forcing culture for these Varieties ,productive techniques by using cell plants for labor-saving and lighting are investigated.
When‘Satinoka’was grown by using cell plants , the condition that the yield was increased as follows ; the days of raising was for 40days ,the amount of applied fertilizer was 100mg/130ml cell,the date of planting was September 10, ‘Totiotome’was grown by using cell plants ,the condition that the yield was increased as follows ; the days of raising was for 40~50days,amount of applied fertilizer was 100mg/180ml cell,the date of planting was September 5.
When the lighting was begun in the begining of November,the plant height was over 25cm in the begining harvest,also the total yield and the yield by March were increased.
As well as the growth of the leaf stalk length and leaf blade were promoted by lighting ,the size of fruits was increased.

Development of Using Technique by High-Pressure Sodium Lamps on the Culture of Autumn-Flowering Spray Type Chrysanthemums
Atsushi SASAKI ,Yasumasa SATO and Kouetsu SUGIMOTO



In order to improve productivity during winter and spring seasons and save energy production on the culture of autumn-flowering spray type chrysanthemums, the possibility of supplemental lighting and the source of lighting for night break by high-pressure sodium lamps were examined. The main results were as follows. When these plants were grown with supplemental lighting by high-pressure sodium lamps, the flowering time was delayed a little. And quantitative characters such as length, fresh weight of cut flower were improved. The effects of night break by high-pressure sodium lamps for 2 hours were almost equal to that of night break by incandescent lamps for 4 hours on regulation of flowering. And this consumption of electric power was reduced to about 50% of the control. These results indicate that the possibility of using by high-pressure sodium lamps is strong.

Control Method of Nitrogen Fertilizer and Water Feeding based on Nutritional Diagnosis for the Summer-autumn Growing Tomato on the Fertigation System
Keiichi KAMIYAMA , Yasuko ONODERA and Ko ONUMA



We examined nutritional diagnosis according to ion concentration of petiole juice and fresh soil of Summer-Autumn growing tomato by fertigation, and made nutritional diagunosis standard of nitrate ion concentration.
Standard of nitrate ion concentration was 5000~7000ppm at the first fruit cluster, 4000~6000 ppm at the secand, 2000~4500ppm at the third to sixth. Sampling sections were the bottom of the little petiole directly under the fruit cluster. Nutrional diagnosis time was decided by a diameter of fruits. Diagnosis should be done at 4~5cm diameter of tomato fruits.
Standard of nitrate ion concentration in filtration solution mixed fresh soil and water (mixture ratio 1to2) was 100~300ppm.
Standard of water feeding in growth period was pF 1.8~2.0 after first fruit cluster brooming period, but case of the plug seeding directly planted in field, standard of water feeding was pF 2.3 over before first fruit cluster brooming period, and amount of basal fertilizer to maintain ealry nutrition condition was some 1.0 kg/a as nitrate element.









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