This page has only limited features, please log in for full access.
Compelling evidence recently demonstrated that plants can take up nitrogen (N) as organic molecules. Yet, very little research addressed this issue in the context of organic horticulture, where N is provided as organic residues. Organic N and carbon (C) transported from roots to shoots could contribute significantly to the plant C and N accumulation. We posited that the type (organic or mineral) and amount of N fertilization affect the soluble organic N and C content of the growing medium, in turn influencing xylem sap N and C and fruit soluble solids content (SSC). To test this hypothesis, we collected growing medium, xylem sap, and fruit samples in a greenhouse cucumber crop grown in a peat-based growing medium and fertilized with organic (blood and feather meals) or mineral (ammonium nitrate) N fertilizers. The organic N source reduced growing medium concentrations of soluble mineral and organic N relative to the mineral source through microbial immobilization. Xylem sap C and N were positively linked to the soluble C and N contents of the growing medium, contributing to higher fruit SSC. A causal model is proposed, in which 62.6% of the variance observed in fruit SSC is explained by variation in mineral soluble N and soluble organic C in the growing medium and dissolved organic C and amino acids in xylem sap. Our results provide in situ indications that organic molecules in the growing medium are taken up by cucumber plants and contribute to fruit soluble solids in a context relevant to greenhouse horticulture.
Pierre-Paul Dion; Sandra Jämtgård; Annick Bertrand; Mireille Thériault; Steeve Pepin; Martine Dorais. Growing medium soluble carbon and nitrogen influence xylem sap and soluble solid contents in greenhouse cucumber fruits. Canadian Journal of Plant Science 2021, 101, 366 -376.
AMA StylePierre-Paul Dion, Sandra Jämtgård, Annick Bertrand, Mireille Thériault, Steeve Pepin, Martine Dorais. Growing medium soluble carbon and nitrogen influence xylem sap and soluble solid contents in greenhouse cucumber fruits. Canadian Journal of Plant Science. 2021; 101 (3):366-376.
Chicago/Turabian StylePierre-Paul Dion; Sandra Jämtgård; Annick Bertrand; Mireille Thériault; Steeve Pepin; Martine Dorais. 2021. "Growing medium soluble carbon and nitrogen influence xylem sap and soluble solid contents in greenhouse cucumber fruits." Canadian Journal of Plant Science 101, no. 3: 366-376.
Nutrient leaching losses from horticultural production threaten the quality of groundwater and freshwater systems worldwide. The objectives of this study were to (a) assess the effects of annual applications of ammonium sulfate fertilizer through fertigation (FERT) and broadcast (BROAD) on nutrient leaching losses and (b) determine the links among chemical property changes in leachates and soil with berry yields after 9 and 11 years of blueberry production. The long-term blueberry site was established in 2008 using seven combinations of treatments including an unfertilized control (CONT) and three N fertilizer rates (100%, 150%, 200% of recommended rates) using BROAD and FERT methods. Nutrients concentrations (NO3−-N, NH4+-N and SO42−-S) and chemical properties (pH and electrical conductivity (EC)) of leachate, sawdust and soil and berries were assessed. All FERT methods resulted in concentrations of NO3−-N in the leachates > 100 mg L−1 with a maximum of 200 mg L−1 for FERT-200 during the growing season due to the easy transport of dissolved nutrients with the irrigation water. All BROAD methods resulted into concentrations of NO3−-N in the leachates >10 mg L−1 with a maximum of 35 mg L−1 for BROAD-200 between April and July, as well as between November and April, indicating two periods of NO3−-N leaching losses. The pattern observed with BROAD indicates that irrigation water in the summer and heavy rainfall in the winter contribute to NO3−-N leaching losses. Concentrations of NH4+-N in the leachates >1 mg L−1 were measured under FERT with a peak at 64.78 mg L−1 for FERT-200, during the period April to August, due to NH4+’s ability to quickly move through the sawdust layer with irrigation water. Principal component analysis linked berry yield decrease with ammonium sulfate applications above recommended rates (FERT and BROAD) and with changes in soil pH and EC. Our results demonstrated that excess fertilizer applications above recommended rates using FERT and BROAD can threaten the sustainability of blueberry production by enhancing nutrient leaching losses and reducing berry yield.
Aimé J. Messiga; Kathryn Dyck; Kiera Ronda; Kolden Van Baar; Dennis Haak; Shaobing Yu; Martine Dorais. Nutrients Leaching in Response to Long-Term Fertigation and Broadcast Nitrogen in Blueberry Production. Plants 2020, 9, 1530 .
AMA StyleAimé J. Messiga, Kathryn Dyck, Kiera Ronda, Kolden Van Baar, Dennis Haak, Shaobing Yu, Martine Dorais. Nutrients Leaching in Response to Long-Term Fertigation and Broadcast Nitrogen in Blueberry Production. Plants. 2020; 9 (11):1530.
Chicago/Turabian StyleAimé J. Messiga; Kathryn Dyck; Kiera Ronda; Kolden Van Baar; Dennis Haak; Shaobing Yu; Martine Dorais. 2020. "Nutrients Leaching in Response to Long-Term Fertigation and Broadcast Nitrogen in Blueberry Production." Plants 9, no. 11: 1530.
Horticultural greenhouse production in circumpolar regions (>60° N latitude), but also at lower latitudes, is dependent on artificial assimilation lighting to improve plant performance and the profitability of ornamental crops, and to secure production of greenhouse vegetables and berries all year round. In order to reduce energy consumption and energy costs, alternative technologies for lighting have been introduced, including light-emitting diodes (LED). This technology is also well-established within urban farming, especially plant factories. Different light technologies influence biotic and abiotic conditions in the plant environment. This review focuses on the impact of light quality on plant–microbe interactions, especially non-phototrophic organisms. Bacterial and fungal pathogens, biocontrol agents, and the phyllobiome are considered. Relevant molecular mechanisms regulating light-quality-related processes in bacteria are described and knowledge gaps are discussed with reference to ecological theories.
Beatrix Alsanius; Maria Karlsson; Anna Rosberg; Martine Dorais; Most Naznin; Sammar Khalil; Karl-Johan Bergstrand. Light and Microbial Lifestyle: The Impact of Light Quality on Plant–Microbe Interactions in Horticultural Production Systems—A Review. Horticulturae 2019, 5, 41 .
AMA StyleBeatrix Alsanius, Maria Karlsson, Anna Rosberg, Martine Dorais, Most Naznin, Sammar Khalil, Karl-Johan Bergstrand. Light and Microbial Lifestyle: The Impact of Light Quality on Plant–Microbe Interactions in Horticultural Production Systems—A Review. Horticulturae. 2019; 5 (2):41.
Chicago/Turabian StyleBeatrix Alsanius; Maria Karlsson; Anna Rosberg; Martine Dorais; Most Naznin; Sammar Khalil; Karl-Johan Bergstrand. 2019. "Light and Microbial Lifestyle: The Impact of Light Quality on Plant–Microbe Interactions in Horticultural Production Systems—A Review." Horticulturae 5, no. 2: 41.