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UBC Theses and Dissertations
Impact of postharvest deficit irrigation and organic amendments on sweet cherry production at newly and previously established orchards in the Okanagan Valley Gebretsadikan, Tirhas Mebratu
Abstract
In the Okanagan Valley, sweet cherry production has expanded to higher altitudes due to climate change, but water availability and maintenance of soil health are major concerns for sustainable production. This study examined the effects of mulches and postharvest deficit irrigation (PDI) on soil health, tree productivity and fruit yield and quality in cherry orchards over two seasons. Sweet cherry trees were planted with six replicates at three sites in a randomized block split-plot design, while a split-split-plot experimental design was used at the fourth site. Two irrigation rates (100% and ~70% water supply) were the main-plots, with mulches (compost, woodchips and bare ground) as sub-plots for three sites. Fumigation, compost and legacy effect of mulch and P fertigation were assigned accordingly as main-, sub- and sub-subplots at Site 4. Mulched (Sites 1-3) or incorporated (Site 4) compost increased soil organic matter, nutrients, pH and conductivity at all sites. Compost decreased arbuscular mycorrhizal fungi (AMF) colonization and increased total bacteria in soil, while fewer root P. penetrans were detected from incorporated compost alone or in combination with fumigation compared to the corresponding control. By contrast, woodchips affected only a few of these soil properties, including increasing soil C and C:N, and decreasing AMF colonization. The legacy effect of mulch at Site 4 was associated with increases in most soil nutrients, and higher total fungal populations when legacy mulch was combined with fumigation. Compost increased soil moisture compared to bare ground, but had no effect on stem water potential of cherry trees. Compost also increased leaf area, a few foliar nutrients and fruit quality attributes, while no impacts of woodchips were observed on these parameters compared to bare soil, with very few exceptions. Use of PDI saved up to 28% irrigation water after fruit harvest per season without affecting soil moisture, soil biochemical properties, stem water potential, or any tree growth and productivity parameters. Overall, results suggest that mulches are a promising strategy to maintain soil moisture, improve soil fertility, plant growth and productivity, and PDI has the potential to reduce irrigation water use after harvest without affecting cherry production.
Item Metadata
Title |
Impact of postharvest deficit irrigation and organic amendments on sweet cherry production at newly and previously established orchards in the Okanagan Valley
|
Creator | |
Publisher |
University of British Columbia
|
Date Issued |
2019
|
Description |
In the Okanagan Valley, sweet cherry production has expanded to higher altitudes due
to climate change, but water availability and maintenance of soil health are major concerns for
sustainable production. This study examined the effects of mulches and postharvest deficit
irrigation (PDI) on soil health, tree productivity and fruit yield and quality in cherry orchards over
two seasons. Sweet cherry trees were planted with six replicates at three sites in a randomized
block split-plot design, while a split-split-plot experimental design was used at the fourth site.
Two irrigation rates (100% and ~70% water supply) were the main-plots, with mulches
(compost, woodchips and bare ground) as sub-plots for three sites. Fumigation, compost and
legacy effect of mulch and P fertigation were assigned accordingly as main-, sub- and sub-subplots at Site 4. Mulched (Sites 1-3) or incorporated (Site 4) compost increased soil organic
matter, nutrients, pH and conductivity at all sites. Compost decreased arbuscular mycorrhizal
fungi (AMF) colonization and increased total bacteria in soil, while fewer root P. penetrans were
detected from incorporated compost alone or in combination with fumigation compared to the
corresponding control. By contrast, woodchips affected only a few of these soil properties,
including increasing soil C and C:N, and decreasing AMF colonization. The legacy effect of
mulch at Site 4 was associated with increases in most soil nutrients, and higher total fungal
populations when legacy mulch was combined with fumigation. Compost increased soil
moisture compared to bare ground, but had no effect on stem water potential of cherry trees.
Compost also increased leaf area, a few foliar nutrients and fruit quality attributes, while no
impacts of woodchips were observed on these parameters compared to bare soil, with very few
exceptions. Use of PDI saved up to 28% irrigation water after fruit harvest per season without
affecting soil moisture, soil biochemical properties, stem water potential, or any tree growth and
productivity parameters. Overall, results suggest that mulches are a promising strategy to
maintain soil moisture, improve soil fertility, plant growth and productivity, and PDI has the
potential to reduce irrigation water use after harvest without affecting cherry production.
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Genre | |
Type | |
Language |
eng
|
Date Available |
2019-04-29
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Provider |
Vancouver : University of British Columbia Library
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Rights |
Attribution-NonCommercial-NoDerivatives 4.0 International
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DOI |
10.14288/1.0378506
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URI | |
Degree | |
Program | |
Affiliation | |
Degree Grantor |
University of British Columbia
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Graduation Date |
2019-05
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Campus | |
Scholarly Level |
Graduate
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Rights URI | |
Aggregated Source Repository |
DSpace
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Rights
Attribution-NonCommercial-NoDerivatives 4.0 International