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Found 8 matching results.(Clear)
  • 17
    Dec
    Gerbera Arava
    Flowers

    תאריך עדכון 14/3/2008

    תיאור מלא Gerbera (Gerbera hybrida) has been traditionally cultivated in Israel in the relatively humid and temperate coastal regions. During many years this crop was avoided in the Arava Valley due to the threats of the water salinity and the high temperatures, and the costly transportation. Following a successful venture in a private farm, a decision has been made to test the feasibility of Gerbera cultivation in Yair station. The examination was conducted during two seasons between 2005-7 in three growth media (soil, volcanic gravel (Touf), and Perlite), in both cooled and open greenhouse conditions, simultaneously. It has been concluded, that the Gerbera cultivation in the Arava has a significant relative advantage, especially during winter time. The yield quality and quantity were good with no heating requirements. Botrytis cinerea, which is a major pathogen of Gerbera cultivation in the coastal Plain, did not affect the winter crop in the Arava due to the low relative humidity of the region. Attempts to pass the summer failed, as many plants were affected by various soil diseases. The experimental work will continue the examination of Gerbera cultivation in the soil as well as in other growth media as an annual crop which should be replanted yearly.

    שפה English
    מחבר Maayan P. Kitron, Keren Elbaz, Avi Oshrowits, Dudu Elkayam, Nissim Pines, Amnon Navon
    שנה 2008
    שייכות yzvieli
    תאריך יצירה 14/3/2008
    תאריך עדכון 14/3/2008

    OPEN
  • 10
    Dec
    The effects of different types of lighting on the flowering of Asclepias tuberosa
    Flowers

    תחום או ענף אגרוטכנולוגיה; פרחים

    תאריך עדכון 1/10/2011

    תיאור מלא The effects of different types of lighting on the flowering of Asclepias tuberosa

    Maayan Plaves Kitron, Eithan Shlomo, Katrina Krizova, Avi Usherovitz -
    Central and Northern Arava R&D
    Yair Nishri - Extension Service (SHA'AM), Ministry of Agriculture and Rural Development

    Email for correspondence: maayank@arava.co.il

    Asclepias tuberosa is a member of the Apocynaceae family. It is a perennial shrub native to South America. This plant grows in well-drained soils. It is also known as the butterfly plant because butterflies are attracted to its flowers due to their color and abundant nectar. A. tuberosa has been grown in Israel for a number of years. Production has been concentrated in the Negev, due to this plant’s sensitivity to low temperatures during the winter and its need for long days. This crop has been evaluated in the Arava in the past, but failed as a commercial crop. Since the development of new cropping technologies has led to both an increase in the amount of area planted to this crop in the Negev and good economic returns per unit area, we decided to once again evaluate this crop under the conditions present in the Arava, with the goal of increasing the variety of flowers exported from the Arava region.
    The crop was evaluated during the 2008/9 and 2009/10 growing seasons at the Yair Research Station in the Arava under a number of different types of lighting- white light, fluorescent, low-intensity red LED, high-intensity red LED and blue LED. During the first season (first wave), we learned that day length is critical to this crop and that only bulbs that give off very intense light — white, fluorescent or red LED — encourage the induction of flowering in A. tuberosa. The best results in terms of the number of flowers harvested per meter were observed in the white-light treatment. However, the fluorescent-light and high-intensity LED treatments also had good yields. Quality measures were similar for all of the treatments, except for the control, which was inferior. We do not recommend the use of blue LED lighting. The results were not confirmed in the second wave, in which the yields in the blue LED and white-light treatments were low. Following the appearance of serious damage caused by a viral disease, we decided to stop the experiment. It appears to us that this study should be repeated with the addition of an appropriate treatment to prevent viral infection of the plants.

    שפה English
    מלות מפתח cut flowers, light, LED (Light emitting diode).
    מחבר Maayan Plaves Kitron, Eithan Shlomo, Katrina Krizova, Avi Usherovitz, Yair Nishri
    שנה 2010
    שייכות yzvieli
    תאריך יצירה 1/10/2011
    תאריך עדכון 14/3/2012

  • 10
    Dec
    A new approach to flower production in the Arava : Improvement of sanitation and the quality and quantity of flower yields and significant reductions in production costs for Trachelium, Solidago and Lisianthus Trachelium, Solidago and Lisianthus
    Flowers

    תחום או ענף פרחים
    תאריך עדכון 1/10/2011

    תיאור מלא A new approach to flower production in the Arava: Improvement of sanitation and the quality and quantity of flower yields and significant reductions in production costs for Trachelium, Solidago and Lisianthus

    Maayan Plaves Kitron, Eithan Shlomo, Katrina Krizova, Avi Usherovitz - Central and Northern Arava R&D
    Michel Zaacai – Ben-Gurion University.
    Yair Nishri - Extension Service (SHA'AM) Ministry of Agriculture and Rural Development

    Email for correspondence: maayank@arava.co.il

    Keywords: Cut flowers, polyethylene, Trachelium, Solidago, Lisianthus.

    Cut flowers account for an important portion of the Arava’s crops and are a source of income for local growers. Thanks to the unique environmental conditions found in the Arava, different types of cut flowers are grown in this area. Among these, sunflower, Trachelium, statice (Limonium) and lisianthus stand out. The excellent local growing conditions lend themselves to the production of high-quality flowers, mostly during the periods of high market demand. However, there are still many difficulties related to the uncompromising demands of the European and world markets for flowers that are free of any damage from pests. During the summer and fall, it is desirable and recommended to grow Trachelium, Solidago and other flowers under shade coverings appropriate for the particular crop. In November, as the days get shorter and temperatures drop, this netting is removed and the cropping structures are covered with polyethylene, which is left in place through March. In April, as the days get longer and temperatures rise, this polyethylene is removed and shade netting is once again spread over the structures.
    In an experiment conducted at the Yair Research Station during the 2009-2010 season, we evaluated Trachelium, Solidago and lisianthus crops grown under 50-mesh netting. Some of the tunnels were also covered with polyethylene. The plants in the control tunnels were grown as is customary; plants were transplanted under shade netting and the cropping structures were later covered with polyethylene. The results of this study indicate that the three crops grew well when they were covered only by 50-mesh shade netting and that the addition of a polyethylene covering to the insect netting negatively affected the yield and yield quality of Trachelium, but improved lisianthus and Solidago yields.

    Acknowledgements
    We thank the Lev Tov Nursery for supplying us with the Solidago seedlings.

    שפה English
    מלות מפתח Cut flowers, polyethylene, Trachelium, Solidago, Lisianthus
    מחבר Maayan Plaves Kitron, Eithan Shlomo, Katrina Krizova, Avi Usherovitz, Michel Zaacai, Yair Nishri
    שנה 2010
    שייכות yzvieli
    תאריך יצירה 1/10/2011
    תאריך עדכון 1/10/2011

  • 10
    Dec
    Study of the effects of fertilizer use and the foliar application of microelements on leaf damage in Limonium sinuatum
    Flowers

    Study of the effects of fertilizer use and the foliar application of microelements on leaf damage in Limonium sinuatum

    תחום או ענף פרחים
    תאריך עדכון 1/10/2011

    Study of the effects of fertilizer use and the foliar application of microelements on leaf damage in Limonium sinuatum
    Maayan Plaves Kitron, Eithan Shlomo, Katrina Krizova, Avi Usherovitz – Central and Northern Arava R&D
    Yair Nishri - Extension Service (SHA'AM), Ministry of Agriculture and Rural Development

    Email for correspondence: maayank@arava.co.il

    Perennial statice (Limonium sinuatum), which is a member of the Plumbaginaceae family, is an important cut-flower crop. This plant is known for its ability to tolerate dry conditions and, for this reason, it is a cut-flower crop that can be grown in dry regions. Today in Israel, this crop covers approx. 200 dunams and production is concentrated in the Negev and Arava. For years, growers have been faced with the phenomenon of foliar damage, in the form of a yellowing of leaves that then spreads to young leaves and the green tissue of the flower stalk. Over time, the damaged tissue turns red. When the damage is light, growth is delayed and the flower yields of the affected stems are reduced. When damage is heavy or long-lasting, there will be total or partial degeneration of the plant and a great amount of yield loss. Growers and crop advisors refer to this phenomenon as the “statice headache” and there is a general understanding that this phenomenon is associated with non-optimal nutrition. The first results of our observational study show that plant functioning can be improved and damage to vegetative tissue can be decreased through the use of fertilizer, particularly slow-release fertilizer and foliar fertilizer sprays.

    Acknowledgements
    We thank Shahar Russell of the FERTILIZERS & CHEMICALS Company and Nadav Rotem of the Danziger Nursery.

    שפה English
    מלות מפתח cut flowers, fertilizer, microelements, Limonium sinuatum
    מחבר Maayan Plaves Kitron, Eithan Shlomo, Katrina Krizova, Avi Usherovitz, Yair Nishri
    שנה 2010
    שייכות yzvieli
    תאריך יצירה 1/10/2011
    תאריך עדכון 1/10/2011