Search Results
Abstract
Chrysanthemum morifolium Ramat. cv. Bright Golden Anne and Lycopersicon esculentum Mill. cv. Ohio M-R 13 plants were grown in media amended with insolubilized poly(ethylene oxide) (VITERRA Hydrogel) and foliar element levels determined. Results showed that VITERRA Hydrogel did not consistently alter foliar element levels.
Abstract
Traditional methods of harvesting were compared to a once-over bud harvest of standard chrysanthemum (Chrysanthemum morifolium Ramat. cv. May Shoesmith). Despite greater direct labor and material requirements, once-over bud harvesting resulted in net returns that were 11 to 17% greater than that for traditional flower harvesting. The economic feasibility of bud harvesting was more dependent on potential productivity increases rather than the additional labor and opening area requirements necessary for bud harvesting.
Abstract
Ethylene concentration greater than 1 ppm added to ornamental lime plants (Citrus latifolia Tan. cv. Persian), held in air-tight containers caused serious defoliation of intact plants. No C2H4 was detectable in cartons of lime plants shipped from Florida to Ohio although defoliation occurred.
Abstract
Growth of ‘Cambell-28’ (C-28) tomato (Lycopersicon esculentum. Mill.) seedlings at 250 torr was stimulated over growth at 750 torr but growth appeared to be inhibited at 125 torr. Growth stimulation was measurable after a lag phase.
Abstract
Ethylene was detected in the internal atmosphere of 5 bulb species. Some, if not all, of the determined ethylene concn are of physiological significance. Experiments using methyl l-(butylcarbamoyl)-2-benzimi-dazole carbamate, a protective fungicide, indicate that fungi normally associated with tulip bulbs are at least partially responsible for the gas.
Abstract
Various silver containing solutions were evaluated for their effectiveness in extending the life of cut carnations (Dianthus caryophyllus, L. ‘Improved White Sim’) by simple chemical tests of the solutions. Effective solutions formed an immediate white or yellow precipitate (AgI) when 3.0 ml of the solution reacted with 0.15 ml of 2.0 m KI solution, whereas no precipitate formed when reacted with 0.15 ml of 2.0 m NaCI solution. When no precipitate formed with KI, there was insufficient silver in the solution to extend flower life, and hence, no silver was detected in a combined stem and leaf sample or in the flower head (consisting of receptacle, pistil, bracts, calyx and petals). A precipitate forming with both KI and NaCI indicated that the solution contained silver but in the wrong formulation to extend life. Flowers treated with this solution had silver in the combined stems and leaves, but practically none in heads. When solutions were effective, more silver was detected in heads than in the stems and leaves combined.
Abstract
Normal refrigeration (NR), low pressure (LP, 10 to 35 mm Hg), and low oxygen (0.5% to 8%) storage trials were conducted using cut flowers of carnation (Dianthus caryophyllus L.) and rose (Rosa sp.). Variables studied were storage time, gas partial pressures, vapor barriers, chemical pretreatments, grower source, cultivars, and stem recutting methods. Low oxygen storage was not beneficial regardless of variables tested. In general, carnations could be stored for 6 weeks under NR and 8 weeks under LP conditions if the flowers were pretreated with silver thiosulfate (STS) and vapor barriers were utilized during NR storage. Roses could be stored up to 2 weeks under NR and up to 4 weeks under LP conditions and still exhibit at least 61% of their nonstored, original vase-life if LP-induced leaf disorders were not considered. Rose vase-life after NR storage was enhanced by utilizing vapor barriers during storage, and visual appearance improved if stems were recut under water upon removal from storage. LP-stored roses did not benefit by these treatments. However, the same cultivars from different growers did not respond equally and great variability was noted among rose cultivars tested regardless of storage method. Of special concern were the LP-induced leaf disorders noted on ‘Forever Yours’, ‘Royalty’, ‘Town Crier’, and ‘Spanish Sun’ roses.
Abstract
Immersing stems of carnation flowers (Dianthus caryophyllus L. cv. White Sim) in solutions containing a silver thiosulfate complex prepared by combining silver nitrate with sodium thiosulfate (molar ratio 1:4) doubled their vase life (from 5 to more than 10 days). The effect could be achieved by treating stems with solutions containing as little as 1.0 mM Ag with a pulse as short as 10 minutes. Silver uptake estimations indicated that a minimum of 0.5 μmol Ag was required per stem for maximum vase life and that more than 5 μmol Ag per stem was toxic.
Abstract
Terms describing or identifying developmental stages of horticultural crops are not used consistently, thus the meaning of each term becomes ambiguous. The cause for this discrepancy is speculative; however, the discrepancy could be minimized if a set of widely applicable definitions were available as guides in selecting the appropriate terms. Lott (2) recommended definitions for the terms “mature” and “ripening” and their derivatives. However, his definitions of the term “mature” and its derivatives were restricted to fruit while it is still attached to the plant, and the definitions of the term “ripe” and its derivatives were restricted to physiological changes and conditions which occur in fruit following harvest, which limit the use of terms only to specific fruits and exclude any of those ripening prior to harvest.