Effect of electrical conductivity levels of nutrient solution on growth, gas exchanges and yield of two Gerbera cultivars in soilless system.

Book Title: NA
Year Published: 2003
Month Published: NA
Author: Paradiso, R. ; Pascale, S. de ; Aprea, F. ; Barbieri, G.
Book Group Author: NA
Abstract:

To evaluate the response of two Gerbera jamesonii cultivars to EC level of nutrient solution, a greenhouse experiment was carried out on one-year-old plants fertigated with two EC values, 1.6 and 2.4 dS m-1, at pH 6.0. Plants of Brittani and Golden Serena cultivars were grown in pots, on 7:3 mixture (v/v) of peat and perlite. Water and fertilizers were supplied by a drip system and the number of pulses was one per day from April to June and from September to October, two per day in July and August, and three per week in November. Nutrient solution was applied per pulse, with ~20% leaching. Gas exchanges were unaffected by EC level of nutrient solution and cultivars and higher net photosynthesis (15.02 µmol CO2 m-2 s-1) was recorded in spring months, with the maximum transpiration rate in may (11.18 mmol m-2 s-1). During the 8-month period, daily water uptake was higher in plants fertigated with 2.4 dS m-1 compared with 1.6 dS m-1 (471 vs. 423 ml per plant), according with the difference in leaf area (65.8 vs. 60.4 dm2) and yield (34.3 vs. 29.9 flowers). Higher EC level increased the content of N (3.89 vs. 3.36% dry matter), N-NO3 (0.56 vs. 0.39%), P (0.14 vs. 0.10%) and K (4.30 vs. 2.89%) in young leaves. No difference was found between the cultivars in water uptake and nutrient composition of leaves. Brittani yielded higher number of flowers (35.2 vs. 29.1 per plant).

Pages: 165 - 171
URL: http://0-search.ebscohost.com.catalog.library.colostate.edu/login.aspx?direct=true&AuthType=cookie,ip,url,cpid&custid=s4640792&db=lah&AN=20033157128&site=ehost-live
Volume: NA
Number: 609
Journal: Acta Horticulturae
Journal ISO: NA
Organization: NA
Publisher: NA
ISBN: NA
ISSN: 0567-7572
DOI: NA
Keywords:

application rates, chemical composition, crop yield,cultivars, cut flowers, dry matter, electrical conductivity, flowers,gas exchange, growth, hydroponics, leaf area, leaves, nitrate nitrogen,nitrogen, nitrogen content, nutrient content, nutrient solutions,phosphorus, photosynthesis, plant composition, potassium, salinity,soilless culture, transpiration, water uptake, Gerbera jamesonii,Gerbera, Asteraceae, Asterales, dicotyledons, angiosperms,Spermatophyta, plants, eukaryotes, carbon assimilation, carbon dioxidefixation, chemical constituents of plants, cultivated varieties,Horticultural Crops (FF003) (New March 2000), Plant Breeding andGenetics (FF020), Plant Composition (FF040), Plant Physiology andBiochemistry (FF060), Plant Nutrition (FF061), Plant Water Relations(FF062), Plant Production (FF100), Non-food/Non-feed Plant Products(SS200)

Source: EBSCO
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