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Choi S.-T.,Sweet Persimmon Research Institute | Park D.-S.,Sweet Persimmon Research Institute | Kim E.-S.,Sweet Persimmon Research Institute | Shin H.-Y.,Research and Development Bureau | Kang S.-M.,Gyeongsang National University
Scientia Horticulturae | Year: 2014

Growth and characteristics of the fruits developed from "delayed flowers" (DFs) of 'Fuyu' persimmon (Diospyros kaki) were investigated to determine their usefulness to supplement the frost-damaged normal flowers (NFs). In hand-pollinated trees without frost damage, DFs bloomed on June 6 and June 5 in 2012 and 2013, respectively, 13 and 11 days later compared with NFs. DF fruit diameters were 5.8-9.4. mm less than the NF fruits on July 16 in both years, but the difference became 1.5-2.4. mm on August 27. Such a difference persisted until harvest on November 12. DF fruits at harvest weighed 6.6-7.3% less compared with NF fruits, an insignificant reduction. Skin color, firmness, and soluble solids of fruits were not different between both DF and NF. In trees with insufficient NFs due to spring-frost, DF bloomed 10 days later than NF. DF decreased fruit drop under open pollination but produced more deformed fruits. DF fruits, containing more seeds, were not significantly lower in size, skin color, and soluble solids. It was concluded that DFs could yield marketable fruits with no delay in maturity although their size is slightly smaller. © 2014 Elsevier B.V.

Chung Y.M.,Flower Research Institute | Hwang J.C.,Flower Research Institute | Chin Y.D.,Flower Research Institute | Lee J.S.,South Korean National Institute of Animal Science | And 4 more authors.
Korean Journal of Horticultural Science and Technology | Year: 2013

A new pink gerbera (Gerbera hybrida Hort.) cultivar 'Party Time' was developed from a cross between 'Hope' and 'Sunnyeo', followed by seedling and line selections at the Flower Research Institute of Gyeongnam Agricultural Research and Extension Services (GARES) in 2007. Detailed characteristics of the new cultivar were evaluated from 2005 to 2007. 'Party Time' has semi-double type large flowers in a good harmony with pink (RHS, 65-C) ray floret and brown center. It has a good, stable flower shape and strong peduncles, and its vase life was 12.7 days. The average flower yield of 'Party Time' was about 47.3 stems per plant a year in greenhouse yield trails carried out 2005 to 2007. 'Party Time' (Grant No. 2691) was registered to the Korea Seed and Variety Service (KSVS) for commercialization in 2009.

Hwang J.-C.,Flower Research Institute | Chin Y.-D.,Flower Research Institute | Chung Y.-M.,Flower Research Institute | Kim S.-K.,Flower Research Institute | And 2 more authors.
Korean Journal of Horticultural Science and Technology | Year: 2013

A new spray chrysanthemum (Dendranthema grandiflorum) 'Blue Hope' was bred by the Flower Research Institute, Gyeongsangnam-do Agricultural Research & Extension Services in 2009. The cultivar 'Blue Hope' was initially derived from the cross in 2005 between 'Ford', a spray chrysanthemum cultivar, with white anemone type, and 'Chopin', a spray chrysanthemum cultivar with white anemone type. The cultivar has anemone type with white petals. After the evaluation of the characteristics under shade culture in summer and retarding culture in spring and consecutive selection from 2007 to 2009, 'Blue Hope' was selected finality. The natural flowering time of 'Blue Hope' was October 24th, and year-round flowering is possible by shading or lighting treatment. The growth of plant was very vigorous and response time 6.5 weeks. The diameter of flower was 4.9 cm. Number of flowers per stem was 19.1 in autumn. Days to flowering under the short day treatment was about 45 in spring and its vase life was 23.8 days in the autumn season. This cultivar was resistance white rust and consumer's preference of new spray is high level than the control.

Kim B.-S.,Research and Development Bureau | Gu M.,Texas AgriLife Research Center | Cho K.-C.,Research and Development Bureau | Yun B.-K.,Research and Development Bureau | And 2 more authors.
Journal of Horticultural Science and Biotechnology | Year: 2015

The physical and chemical properties of the soil and the growth and fruit yields of mature ‘Fuyu’ persimmon (Diospyros × kaki Thunb.) trees were measured as responses to the frequency of mowing in an organic orchard from 2011 to 2013.Treatments included zero, two, three, or four mowings per annum of the natural vegetation in the orchard to which organic fertiliser was applied annually. The four-fold mowing treatment increased the biomass of the cut vegetation to 8.4 metric tonnes (MT) ha-1 year-1, followed by the three-fold (6.4 MT ha-1 year-1), two-fold (5.7 MT ha-1 year-1), and zero mowings (3.4 MT ha-1 year-1) and the corresponding supply of macro-nutrients from the biomass.The four-fold mowing treatment reduced the bulk density of the soil from 1.3 kg m-3 to 1.1 kg m-3 and increased soil porosity to 59% (measured as air-filled space) as well as increasing the soil organic matter content to 25 - 30 mg kg-1 in March and September 2011 and 2012. Foliar macro-nutrient concentrations, except for foliar P, increased in the two-, three-, and four-fold mowing treatments in 2012. An increased mowing frequency stimulated the number of watersprout shoots, and reduced light transmission into the tree canopy in 2012 and in 2013. The three- and four-fold mowing treatments increased average fruit yields by 28.1 - 29.4 MT ha-1 and average fruit fresh weights (FWs) to 209 - 211 g compared to zero mowing (23.3 MT ha-1 fruit yield and 197 g fruit FW) over the 3 years. The estimated average gross income from fruit sales increased by 183% in the three- and four-fold mowing treatments compared to the zero-mowing treatment over the 3 years. © 2015, Headley Brothers Ltd. All rights reserved.

Yoon Y.-W.,Sweet Persimmon Research Institute | Choi S.-T.,Sweet Persimmon Research Institute | Park D.-S.,Sweet Persimmon Research Institute | Rho C.-W.,Research and Development Bureau | And 2 more authors.
Korean Journal of Horticultural Science and Technology | Year: 2014

To understand changes in composition and distribution of nutrients during early shoot growth of persimmon, organic compounds and inorganic elements of terminal shoots were analyzed for about 40 days from the time of foliation. Sample shoots were collected from mature ‘Fuyu’ trees for this three-year experiment and they were divided to stem, leaves, and the fruits including flower buds at the earliest stage. During shoot growth, concentration of soluble sugars increased in both leaves and fruits, but that of starch increased only in leaves. Those of amino acids tended to decrease in all the parts but there was no consistent change in proteins. As shoots grew, contents of all the organic compounds in a shoot increased, and they were especially higher in May leaves accounting for more than 60% of the shoot total for each nutrient. Along with shoot growth, concentrations of N and P gradually decreased in all three parts, while K decreased only in stem. However, those of Ca and Mg did not show notable changes in all the parts with wide variations depending on the year. Due to the quantitative increase in growth, contents of inorganic elements in a shoot increased in all the parts and the leaves accounted for 54-82% of the shoot total. At the cessation time of extension growth, a shoot contained 526-768 mg of soluble sugars, 245-844 mg of starch, 26-31 mg of amino acids, and 66-103 mg of proteins for three years. On the other hand, a shoot contained 203-388 mg of K, the greatest among the inorganic elements, followed by 132-159 mg of N. Changes of the nutrients in a shoot were much greater during the earlier stage of growth after foliation than during the later stage toward growth cessation, suggesting the importance of mobilizing reserve nutrients for the early growth of the shoots. The results of this study also suggested that the rate of nutrient changes, especially during the earlier stage of shoot growth, could be affected by environmental and cultural conditions. © 2014 Korean Society for Horticultural Science.

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