Subjects -> GARDENING AND HORTICULTURE (Total: 37 journals)
Showing 1 - 20 of 20 Journals sorted alphabetically
Acta Scientiarum Polonorum Hortorum Cultus     Open Access   (Followers: 2)
Advances in Horticultural Science     Open Access   (Followers: 3)
Annales Horticulturae     Open Access   (Followers: 1)
Asian Journal of Agricultural and Horticultural Research     Open Access   (Followers: 1)
Bulletin of University of Agricultural Sciences and Veterinary Medicine Cluj-Napoca. Horticulture     Open Access  
Concrete Garden     Open Access   (Followers: 2)
Corps et culture     Open Access   (Followers: 3)
Culture, Agriculture, Food and Environment     Hybrid Journal   (Followers: 23)
Dekoratyviųjų ir sodo augalų sortimento, technologijų ir aplinkos optimizavimas     Partially Free  
Folia Horticulturae     Open Access   (Followers: 5)
Horticulturae     Open Access   (Followers: 2)
Horticultural Plant Journal     Open Access   (Followers: 6)
Horticulture Research     Open Access   (Followers: 11)
Horticulture, Environment, and Biotechnology     Hybrid Journal   (Followers: 12)
Indian Horticulture     Full-text available via subscription   (Followers: 10)
Journal of Horticultural Research     Open Access   (Followers: 2)
Journal of Horticultural Science and Biotechnology     Hybrid Journal  
Journal of Horticultural Sciences     Open Access   (Followers: 2)
Journal of Horticulture and Forestry     Open Access   (Followers: 5)
Journal of Landscape Architecture     Hybrid Journal   (Followers: 21)
Journal of Vegetable Science     Hybrid Journal   (Followers: 6)
Jurnal Hortikultura Indonesia     Open Access  
Landscape History     Hybrid Journal   (Followers: 14)
Landscape Online     Open Access   (Followers: 1)
Landscape Research     Hybrid Journal   (Followers: 9)
Landscapes     Hybrid Journal   (Followers: 16)
Media, Culture & Society     Hybrid Journal   (Followers: 46)
Mind Culture and Activity     Hybrid Journal   (Followers: 10)
Parallax     Hybrid Journal   (Followers: 11)
Polish Journal of Landscape Studies     Open Access  
Revista Chapingo. Serie horticultura     Open Access  
Revista Colombiana de Ciencias Hortícolas     Open Access  
Science as Culture     Hybrid Journal   (Followers: 11)
Scientia Horticulturae     Hybrid Journal   (Followers: 5)
Sibbaldia: the International Journal of Botanic Garden Horticulture     Open Access  
Studies in Australian Garden History     Full-text available via subscription   (Followers: 1)
Studies in the History of Gardens & Designed Landscapes: An International Quarterly     Hybrid Journal   (Followers: 7)
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Number of Followers: 2  

  This is an Open Access Journal Open Access journal
ISSN (Online) 2311-7524
Published by MDPI Homepage  [233 journals]
  • Horticulturae, Vol. 4, Pages 12: Lettuce Biomass Accumulation and
           Phytonutrient Concentrations Are Influenced by Genotype, N Application
           Rate and Location

    • Authors: T. Casey Barickman, William L. Sublett, Carol Miles, Danielle Crow, Ed Scheenstra
      First page: 12
      Abstract: The purpose of this research is to determine how increasing levels of nitrogen (N) fertilizers, locations, and cultivars affected yields, biomass accumulation, and polyphenol concentrations in lettuce. This study is carried out at the North Mississippi Research and Extension Center (NMREC) and Northwest Washington Research and Extension Center (NWREC). The experiment is a randomized complete block design arranged in a 2 × 2 × 4 factorial with 4 replications. Treatments include two cos (romaine) lettuce cultivars, ‘Salvius’ and ‘Thurinus’. N treatments include 42, 63, 105 and 189 kg·ha−1. ‘Salvius’ has greater fresh mass (FM) and dry mass (DM), and a smaller DM:FM ratio when compared to ‘Thurinus’. The NWREC location has higher lettuce FM and DM. Quercetin-3-glucoside (Q-3-G) increases with increasing N concentrations. There are interactions between locations and lettuce cultivars for chlorogenic acid, Q-3-G, and quercetin/luteolin glucuronide (QL-G). There is increased chlorogenic acid content in ‘Salvius’ at the NMREC and increased concentrations of Q-3-G and QL-G in ‘Thurinus’ compared to the NWREC location. ‘Thurinus’ has significantly more chicoric acid and quercetin-malonyl-glucoside (QM-G) than ‘Salvius’. Lettuce at the NWREC has significantly more chicoric acid and cyanidin-3-glucoside (C-3-G). Lettuce at the NWREC has greater yields and biomass accumulation. Lettuce at the NWREC also has greater amounts of flavonoids and anthocyanins. ‘Salvius’ has greater amounts of phenolic acids and ‘Thurinus’ has greater amounts of flavonoids and anthocyanins.
      Citation: Horticulturae
      PubDate: 2018-06-27
      DOI: 10.3390/horticulturae4030012
      Issue No: Vol. 4, No. 3 (2018)
  • Horticulturae, Vol. 4, Pages 13: Assessing Purchase Patterns of Price
           Conscious Consumers

    • Authors: Alicia Rihn, Hayk Khachatryan, Xuan Wei
      First page: 13
      Abstract: Price greatly influences consumers’ purchasing decisions. Individuals whose decisions are primarily driven by price are said to be ‘price conscious’. To date, studies have focused on defining price consciousness and identifying factors that contribute to price-conscious behavior. However, research using visual attention to assess how price conscious consumers use in-store stimuli is limited. Here, consumers’ purchasing decisions are assessed using a rating-based conjoint analysis paired with eye tracking technology when shopping for ornamental plants. An ordered logit model is employed to understand price conscious consumers’ purchase patterns and choice outcomes. Overall, price conscious consumers are less attentive to price information. Being price conscious tends to reduce purchase likelihood, ceteris paribus. Increasing visual attention to price decreases consumers’ purchase likelihood, which is amplified for price conscious consumers. Price conscious consumers tend to be quicker decision makers than non-price conscious consumers. Results are beneficial to retailers interested in targeting or primarily catering to price conscious consumers.
      Citation: Horticulturae
      PubDate: 2018-07-02
      DOI: 10.3390/horticulturae4030013
      Issue No: Vol. 4, No. 3 (2018)
  • Horticulturae, Vol. 4, Pages 14: Implications of Smallholder Farm
           Production Diversity for Household Food Consumption Diversity: Insights

    • Authors: Luitfred Kissoly, Anja Faße, Ulrike Grote
      First page: 14
      Abstract: Owing to persistent challenges of food and nutritional insecurity, recent literature has focused on the role diversity of farm production has on food consumption diversity, particularly for smallholder households. Yet, the relationship between farm production diversity and household food consumption diversity remains complex and empirical evidence is, so far, mixed. The present article assesses this relationship using two districts—Kilosa and Chamwino—with contrasting agro-ecological and market contexts in rural Tanzania. These districts represent the majority of farming systems found in Tanzania as well as in several countries within the region. We used household data and employed descriptive as well as multivariate regression analyses. The results indicated a positive role of farm production diversity for food consumption diversity in the district with relatively harsh climatic and agro-ecological characteristics and poor access to markets. Furthermore, increased farm production diversity was generally associated with seasonal food consumption diversity. However, results suggested a lesser role of farm production diversity in the presence of better agro-ecological and market access characteristics. These findings imply that promoting farm production diversity should consider the existing agro-ecological and market characteristics. In addition, achieving increased food consumption diversity among rural households may require effective market related infrastructure and institutions.
      Citation: Horticulturae
      PubDate: 2018-07-08
      DOI: 10.3390/horticulturae4030014
      Issue No: Vol. 4, No. 3 (2018)
  • Horticulturae, Vol. 4, Pages 15: A Comparison between Organic and
           Conventional Olive Farming in Messenia, Greece

    • Authors: Håkan Berg, Giorgos Maneas, Amanda Salguero Engström
      First page: 15
      Abstract: Olive farming is one of the most important occupations in Messenia, Greece. The region is considered the largest olive producer in the country and it is recognized as a Protected Designation of Origin (PDO) for Kalamata olive oil, which is considered extra fine. In response to the declining trend of organic olive farming in Greece, this study assesses to what extent organic olive farming in Messenia provides a financially and environmentally competitive alternative to conventional olive farming. In this study, 39 olive farmers (23 conventional and 16 organic) participated in interviews based on questionnaires. The results showed that organic olive farming is significantly more profitable than conventional farming, primarily because of a higher price for organic olive oil. Despite this, the majority of the conventional farmers perceived a low profit from organic farming as the main constraint to organic olive farming. All farmers agreed that organic olive farming contributed to a better environment, health and quality of olive oil. Organic farmers used fewer synthetic pesticides and fertilizers and applied more environmentally-friendly ground vegetation management techniques than conventional farmers. Overall, organic farming was found to provide a competitive and sustainable alternative to conventional olive farming in Messenia.
      Citation: Horticulturae
      PubDate: 2018-07-09
      DOI: 10.3390/horticulturae4030015
      Issue No: Vol. 4, No. 3 (2018)
  • Horticulturae, Vol. 4, Pages 7: Do Extended Cultivation Periods and
           Reduced Nitrogen Supply Increase Root Yield and Anthocyanin Content of
           Purple Carrots'

    • Authors: Lilian Schmidt, Sophia Sorg, Susanne Tittmann, Johannes Max, Jana Zinkernagel
      First page: 7
      Abstract: Purple carrots are rich in anthocyanins which are interesting as natural dyes in food and beverages. It is, thus, relevant to increase the concentration of anthocyanins by agricultural practices. We tested whether the combination of reduced nitrogen (N) supply and extended harvesting periods maximized the anthocyanin concentration of purple carrot roots, ideally without reducing their yield. The carrot variety ‘Deep Purple’ was grown with total N supplies of 220 kg N ha−1 (controls) and 73 kg N ha−1 (reduced N), respectively. Upon harvests in September, October and November, root yield and quality were assessed. Concentrations of chlorophylls (leaves) and anthocyanins (roots and leaves) were determined by spectroscopic and chemical analyses, and carbon and N content were quantified. Reduced N supply neither affected leaf or root biomass nor their chemical composition. Later harvests did not impact the yield of roots, but increased their diameter by 8.5–20%. Additionally, the anthocyanin concentrations of the roots increased by 40–50% in the controls, but not in N-limited plants, at late harvests. Consequently, extending the harvesting period might increase the anthocyanin concentration in roots of ‘Deep Purple’. Moreover, N supply might be reduced for this carrot variety without negative effects on root yield.
      Citation: Horticulturae
      PubDate: 2018-04-16
      DOI: 10.3390/horticulturae4020007
      Issue No: Vol. 4, No. 2 (2018)
  • Horticulturae, Vol. 4, Pages 8: Growth and Physiological Responses of
           Lettuce Grown under Pre-Dawn or End-Of-Day Sole-Source Light-Quality

    • Authors: Skarleth Chinchilla, Luigi G. Izzo, Edzard van Santen, Celina Gómez
      First page: 8
      Abstract: The objective of this study was to evaluate growth and physiological responses of ‘Cherokee’ and ‘Waldmann’s Green’ lettuce (Lactuca sativa) exposed to small changes in light quality and intensity within a 24-h period. Three pre-dawn (PD; 0600 to 0700) and three end-of-day (EOD; 2100 to 2200) treatments were evaluated in the study, each providing 50 ± 2 µmol·m−2·s−1 of either blue, red, or broadband white light from light-emitting diodes (LEDs). To account for the main daily light integral (DLI), broadband white LEDs provided 210 ± 2 µmol·m−2·s−1 from 0700 to 2200 or from 0600 to 2100 for the PD or EOD treatments, respectively. A control treatment was included which provided 200 ± 2 µmol·m−2·s−1 of white light from 0600 to 2200. All treatments provided a DLI of 11.5 mol·m−2·day−1 over a 16-h photoperiod. Regardless of cultivar, no treatment difference was measured for hypocotyl length or leaf number. However, plants grown under EOD-blue or PD-white had up to 26% larger leaves than those grown under PD-red and 20% larger leaves than control. In addition, plants grown under EOD-blue produced up to 18% more shoot fresh mass compared to those grown under control, EOD-red, or PD-red. Contrasts for gas-exchange data collected during the main photoperiod showed that light quality was not significant within PD or EOD for any of the parameters evaluated. However, regardless of light quality, stomatal conductance (gs) and transpiration (E) were up to 34% and 42% higher, respectively, for EOD-grown plants compared to control. Our results suggest that 1 h of low intensity EOD-blue light has the potential to promote lettuce growth by increasing leaf area and shoot fresh mass when the main DLI from sole-source lighting is provided by broadband white LEDs.
      Citation: Horticulturae
      PubDate: 2018-06-07
      DOI: 10.3390/horticulturae4020008
      Issue No: Vol. 4, No. 2 (2018)
  • Horticulturae, Vol. 4, Pages 9: Coconut Leaf Age and Coconut Rhinoceros
           Beetle Herbivory Influence Leaflet Nutrients, Metals, and Lignin

    • Authors: Thomas E. Marler
      First page: 9
      Abstract: The coconut rhinoceros beetle (CRB, Oryctes rhinoceros L.) is a serious pest of coconut (Cocos nucifera L.) in many tropical regions, however the influences of CRB herbivory on the coconut leaf chemistry are unknown. This limits our ability to predict the afterlife decomposition dynamics of the damaged coconut leaf litter. Mature green and senesced leaflet tissues were collected from coconut trees on the island of Guam, where coconut is native and CRB is invasive. Mineral, metal, and lignin concentrations were quantified to determine the nutrient limitations and the litter quality traits. Nitrogen was increased and the elements that are not resorbed during leaf senescence were decreased by the CRB damage. The important litter stoichiometric traits carbon/nitrogen and lignin/nitrogen were decreased by the CRB damage. The results indicate that CRB herbivory may limit green leaf nutrition in Guam’s soils and increase the senesced leaf litter decomposition speed and nutrient turnover rates.
      Citation: Horticulturae
      PubDate: 2018-06-08
      DOI: 10.3390/horticulturae4020009
      Issue No: Vol. 4, No. 2 (2018)
  • Horticulturae, Vol. 4, Pages 10: New Media Components and Fertilization to
           Accelerate the Growth of Citrus Rootstocks Grown in a Greenhouse

    • Authors: Sandra C. Arce, Dania Rivera
      First page: 10
      Abstract: In Puerto Rico, oranges made up $6,452,000 of the agricultural gross income for 2014–2015. Today, citrus greening (CG) is the most aggressive disease affecting the citrus industry in the whole world. This disease causes dieback of the plant, among other symptoms, which is resulting in the reduction of citrus trees in the field across the world. Currently, it is recommended to grow citrus rootstocks in nurseries to produce disease-free trees. The objective of this investigation was to evaluate (before and after grafting) the effect of different substrate mixes and quantities of fertilizers on the rootstocks Carrizo citrange and Swingle citrumelo in order to accelerate their development inside of a protected structure. The treatments were: Promix + sand (control) (1:1), Promix + sand + coco peat (1:1:1), Promix + sand + coffee compost (1:1:1) and Promix + sand + rice husk (1:1:1). Two 18-6-2 fertilizer treatments were also evaluated: 5.6 g and 8.5 g. The substrate that contained 33% rice husks negatively influenced every parameter evaluated for both rootstocks. Carrizo presented better development on the coffee compost mix, while Swingle did not exhibit significant differences among any substrates, except on rice husk, for most of the parameters. “Rhode Red Valencia” presented better results for dry weight when grafted on Carrizo with the coffee substrate. The rice husk substrate is not recommended for the citrus tree production at the nursery level.
      Citation: Horticulturae
      PubDate: 2018-06-10
      DOI: 10.3390/horticulturae4020010
      Issue No: Vol. 4, No. 2 (2018)
  • Horticulturae, Vol. 4, Pages 11: Effects of Elevated Temperature and
           Potassium on Biomass and Quality of Dark Red ‘Lollo Rosso’ Lettuce

    • Authors: William Sublett, T. Barickman, Carl Sams
      First page: 11
      Abstract: Lettuce is an economically important crop for small and medium-sized growers. When grown in adverse environmental conditions, lettuce is vulnerable to a deterioration of yield and quality. Research concerning the impact of elevated potassium (K) levels on leafy vegetables, such as lettuce, is lacking. Therefore, seeds of dark-red ‘Lollo’ lettuce were germinated under greenhouse conditions at 25/20 °C (day/night). Plants were transferred into 11-L containers and placed into growth chambers at 25 and 33 °C. Plants were grown with K treatments of 117.3 (control), 234.6 (2×), 469.2 (4×), and 4) 938.4 (8×) mg·L−1. Increasing K treatments resulted in a negative quadratic response on lettuce dry mass and generated 14% more leaf calcium at 234.6 mg·L−1. An increase in temperature from 25 to 33 °C increased leaf dry matter and biomass by 40% and 43%, respectively. Leaf water content increased by 3% as temperature increased. Plants grown at 33 °C had greater quercetin glycosides compared to plants grown at 25 °C. The results from this study suggest that temperature is a stronger regulatory factor than increasing K in the determination of lettuce yield and quality. Increasing K concentration to 234.6 mg·L−1 results in greater concentrations of leaf minerals without compromising plant yield.
      Citation: Horticulturae
      PubDate: 2018-06-16
      DOI: 10.3390/horticulturae4020011
      Issue No: Vol. 4, No. 2 (2018)
  • Horticulturae, Vol. 4, Pages 1: Poinsettia Growth and Development Response
           to Container Root Substrate with Biochar

    • Authors: Yanjun Guo, Genhua Niu, Terri Starman, Astrid Volder, Mengmeng Gu
      First page: 1
      Abstract: A greenhouse study was conducted to evaluate the growth and development of poinsettia ‘Prestige Red’ (Euphorbia pulcherrima) grown in a commercial peat-based potting mix (Sunshine Mix #1) amended with biochar at 0%, 20%, 40%, 60%, 80%, or 100% (by volume) at four different fertigation regimes: F1: 100 to 200 mg·L−1 nitrogen (N), F2: 200 to 300 mg·L−1 N (control), F3: 300 to 400 mg·L−1 N, or F4: 400 to 500 mg·L−1 N. The experiment was a two-factor factorial design with 10 replications for each combination of biochar by fertigation. As the percentage of biochar increased, root substrate pore space and bulk density increased, while container capacity decreased. Root rot and red bract necrosis only occurred in F4 combined with 100% biochar. Plants grown in 40% biochar had a similar growth and development to those in 0% biochar. Up to 80% biochar, plants exhibited no significant change, except in terms of dry weight, which decreased at higher biochar percentages (60% and 80%). In summary, at a fertigation rate of 100 mg·L−1 N to 400 mg·L−1 N, up to 80% biochar could be used as an amendment to peat-based root substrate with acceptable growth reduction and no changes in quality.
      Citation: Horticulturae
      PubDate: 2018-01-04
      DOI: 10.3390/horticulturae4010001
      Issue No: Vol. 4, No. 1 (2018)
  • Horticulturae, Vol. 4, Pages 2: Acknowledgement to Reviewers of
           Horticulturae in 2017

    • Authors: Horticulturae Editorial Office
      First page: 2
      Abstract: Peer review is an essential part in the publication process, ensuring that Horticulturae maintains high quality standards for its published papers [...]
      Citation: Horticulturae
      PubDate: 2018-01-22
      DOI: 10.3390/horticulturae4010002
      Issue No: Vol. 4, No. 1 (2018)
  • Horticulturae, Vol. 4, Pages 3: Effect of Irrigation on Growth, Yield, and
           Chemical Composition of Two Green Bean Cultivars

    • Authors: Said Saleh, Guangmin Liu, Mingchi Liu, Yanhai Ji, Hongju He, Nazim Gruda
      First page: 3
      Abstract: A study was conducted in an environmentally controlled greenhouse to evaluate two green bean cultivars, ‘Bronco’ and ‘Paulista’, under three application volumes of irrigation water based on replacing 100, 80, and 60% of evapotranspiration (ET). The experiment was in a split-plot design with three replications, recording vegetative growth, yield, pod parameters, water use efficiency (WUE), and chemical content of pods. The results showed that there were no differences between 80% ET and 100% ET for most parameters. In addition, 80% of ET increased the pod yield and improved the pod parameters and chemical composition. Therefore, this irrigation treatment can increase green bean productivity and improve pod quality. Reducing water application from 100 to 60% of ET progressively increased WUE. The ‘Bronco’ cultivar had a higher plant height, pod yield, WUE, pod weight, pod diameter, and total fiber amount than ‘Paulista’, while the ‘Paulista’ cultivar was superior in total chlorophyll, number of pods per plant, pod length, P, Ca, Mg, Fe, Cu, protein, vitamin C, titratable acid, and soluble sugar.
      Citation: Horticulturae
      PubDate: 2018-02-13
      DOI: 10.3390/horticulturae4010003
      Issue No: Vol. 4, No. 1 (2018)
  • Horticulturae, Vol. 4, Pages 4: Evaluation of a New Mexico Landrace and
           Two Commercial Chile (Capsicum annuum) Cultivars under Four Furrow
           Irrigation Schedules

    • Authors: Israel Joukhadar, Stephanie Walker
      First page: 4
      Abstract: Commercial and landrace chile (Capsicum annuum) cultivars are cultivated under furrow irrigation systems in Northern New Mexico. Yield and physiological differences between commercial and landrace chile cultivars under furrow irrigation systems have not been evaluated. In 2011 and 2012 two commercial chiles, ‘Sandia’ and ‘NuMex Big Jim’, with one landrace chile, ‘Chimayo’, were evaluated under four irrigation schedules, with irrigation once every 7, 9, 11, and 13-days. These four schedules represent possible water availability for farmers in Northern New Mexico. In 2011 there were inconsistent yield patterns; fresh red chile yield of ‘Chimayo’ at the seven-day interval was 90% more than at the nine-day interval. ‘Sandia’ had 138% better yields at the seven- than at the nine-day interval. ‘Chimayo’ fresh green chile yields at the nine-day interval were 47% better than the seven-day interval. ‘NuMex Big Jim’ fresh green yields were 40% greater at the seven-day interval than the 13-day interval. In 2012 no yield components were statistically different for cultivars across irrigation intervals. This data shows commercial green and landrace chile cultivars can be furrow irrigated as water becomes available on 7, 9, 11, or 13-day intervals with no yield effect.
      Citation: Horticulturae
      PubDate: 2018-02-24
      DOI: 10.3390/horticulturae4010004
      Issue No: Vol. 4, No. 1 (2018)
  • Horticulturae, Vol. 4, Pages 5: Effect of Paclobutrazol Application on
           Plant Photosynthetic Performance and Leaf Greenness of Herbaceous Peony

    • Authors: Xing Xia, Yuhan Tang, Mengran Wei, Daqiu Zhao
      First page: 5
      Abstract: Paclobutrazol (PBZ) has been associated with effects on the photosynthetic capacity of plants. PBZ affects the growth and development of plants in general. However, little is known about the effects of PBZ on photosynthetic performance and related anatomical features of herbaceous peony (Paeonia lactiflora Pall.) leaves. In the present study, PBZ application resulted in a significant reduction in peony plant height. Furthermore, PBZ application significantly increased photosynthetic rate (Pn), transpiration rate (Tr) and water use efficiency (WUE), but significantly decreased intercellular CO2 concentration (Ci) at some stages from the bolting stage to the bud stage of the plants, compared to controls. Moreover, PBZ application increased the maximum quantum yield of PSII photochemistry (Fv/Fm), coefficient of photochemical quenching (qP) and intrinsic PSII efficiency (ΦPSII), but decreased the coefficient of non-photochemical quenching (qN) and non-photochemical quenching (NPQ). Leaves treated with PBZ had a heavy aggregation of chloroplasts close to the cell wall, with distinct grana lamellae, more and bigger starch grains (on average for a chloroplast), and fewer plastoglobuli, as compared to the control. PBZ increased chlorophyll content (SPAD) and the number of chloroplasts in individual cells in the foliar ultrastructure. PBZ-treated leaves had a darker green color with decreased luminosity (L*) and increased hue angle (h°). The results indicated that plants treated with PBZ were superior in terms of increased photosynthetic characteristics when compared with untreated controls. The direct cause of the increase in Pn and leaf greenness of PBZ-treated P. lactiflora may be the increase in chlorophyll content.
      Citation: Horticulturae
      PubDate: 2018-03-06
      DOI: 10.3390/horticulturae4010005
      Issue No: Vol. 4, No. 1 (2018)
  • Horticulturae, Vol. 4, Pages 6: Impact of Low and Moderate Salinity Water
           on Plant Performance of Leafy Vegetables in a Recirculating NFT System

    • Authors: Genhua Niu, Youping Sun, Joseph Masabni
      First page: 6
      Abstract: Two greenhouse experiments were conducted to examine the growth and mineral nutrition of four leafy vegetables in a nutrient film technique (NFT) system with water with low to moderate salinity. In Expt. 1, a nutrient solution was prepared using reverse osmosis (RO) water and treatments consisted of supplementing with RO water, tap water, or nutrient solution. In Expt. 2, nutrient solution was prepared using three different water sources (treatments), namely, RO water, tap water, or tap water, plus sodium chloride (NaCl), and supplementing solution was prepared using the same three water sources at one third strength. For both of the experiments, seeds of pac choi ‘Tokyo Bekana’, ‘Mei Qing Choi’, and ‘Rosie’ (Brassica rapa var. chinensis) and leaf lettuce ‘Tropicana’ (Lactuca sativa) were sown and were grown in a growth chamber. Two weeks after sowing, seedlings were transplanted to the NFT systems. Expt. 1 was conducted from 19 April to 19 May 2016 and Expt. 2 from 6 September to 12 October 2016. In Expt. 1, nitrate (NO3−) and phosphorus (P) levels in the tanks decreased, and potassium (K+) levels reached almost zero at the end of the experiment when supplemented with RO or tap water. However, calcium (Ca2+), magnesium (Mg2+), and sulfate (SO42−) either did not decrease or increased over time. Supplementing water type did not affect the growth of leaf lettuce and ‘Mei Qing Choi’ pac choi; however, fresh weight of ‘Rosie’ pac choi and both fresh and dry weight of ‘Tokyo Bekana’ pac choi were reduced when supplemented with RO water. Leaf sap NO3− was reduced in ‘Tokyo Bekana’ pac choi, but not in other varieties, when supplemented with RO or tap water. Leaf sap K+ decreased in ‘Tokyo Bekana’, but not in other varieties. The supplementing water type did not impact leaf sap Ca2+, regardless of vegetable varieties. In Expt. 2, NO3− in all of the treatments, P in RO water, and K+ in RO or tap water decreased in the last week of the experiment. Other macronutrients did not change substantially over time. The addition of NaCl significantly reduced the growth of all the vegetables. ‘Tropicana’ leaf lettuce was the least tolerant to NaCl, followed by ‘Rosie’ pac choi. Water source did not affect leaf Ca2+, K+, P, SO42−, and Mg2+ except for ‘Tokyo Bekana’ where NaCl addition decreased Ca2+ and Mg2+. Our results indicated that the tested leafy vegetables differed in response to various types of water used as supplementing or as source water. N, P, and especially K, should be supplemented in the late stage of the experiment, while replacing the whole tank nutrient solution is only necessary when Na+ and/Cl− build up to harmful levels.
      Citation: Horticulturae
      PubDate: 2018-03-10
      DOI: 10.3390/horticulturae4010006
      Issue No: Vol. 4, No. 1 (2018)
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