Abiotic Factors during Spring and Fall in Ohio: Their Measurement and Shaping of Lettuce Tissue Abundance and Composition
| Main Author: | |
|---|---|
| Language: | English |
| Published: |
The Ohio State University / OhioLINK
2012
|
| Subjects: | |
| Online Access: | http://rave.ohiolink.edu/etdc/view?acc_num=osu1337968793 |
| id |
ndltd-OhioLink-oai-etd.ohiolink.edu-osu1337968793 |
|---|---|
| record_format |
oai_dc |
| collection |
NDLTD |
| language |
English |
| sources |
NDLTD |
| topic |
Agriculture Horticulture vegetable production systems high tunnel low tunnel nutritional yield season extension off-season production leaf lettuce |
| spellingShingle |
Agriculture Horticulture vegetable production systems high tunnel low tunnel nutritional yield season extension off-season production leaf lettuce Bumgarner, Natalie Ruth Abiotic Factors during Spring and Fall in Ohio: Their Measurement and Shaping of Lettuce Tissue Abundance and Composition |
| author |
Bumgarner, Natalie Ruth |
| author_facet |
Bumgarner, Natalie Ruth |
| author_sort |
Bumgarner, Natalie Ruth |
| title |
Abiotic Factors during Spring and Fall in Ohio: Their Measurement and Shaping of Lettuce Tissue Abundance and Composition |
| title_short |
Abiotic Factors during Spring and Fall in Ohio: Their Measurement and Shaping of Lettuce Tissue Abundance and Composition |
| title_full |
Abiotic Factors during Spring and Fall in Ohio: Their Measurement and Shaping of Lettuce Tissue Abundance and Composition |
| title_fullStr |
Abiotic Factors during Spring and Fall in Ohio: Their Measurement and Shaping of Lettuce Tissue Abundance and Composition |
| title_full_unstemmed |
Abiotic Factors during Spring and Fall in Ohio: Their Measurement and Shaping of Lettuce Tissue Abundance and Composition |
| title_sort |
abiotic factors during spring and fall in ohio: their measurement and shaping of lettuce tissue abundance and composition |
| publisher |
The Ohio State University / OhioLINK |
| publishDate |
2012 |
| url |
http://rave.ohiolink.edu/etdc/view?acc_num=osu1337968793 |
| work_keys_str_mv |
AT bumgarnernatalieruth abioticfactorsduringspringandfallinohiotheirmeasurementandshapingoflettucetissueabundanceandcomposition |
| _version_ |
1719430655770624000 |
| spelling |
ndltd-OhioLink-oai-etd.ohiolink.edu-osu13379687932021-08-03T06:05:17Z Abiotic Factors during Spring and Fall in Ohio: Their Measurement and Shaping of Lettuce Tissue Abundance and Composition Bumgarner, Natalie Ruth Agriculture Horticulture vegetable production systems high tunnel low tunnel nutritional yield season extension off-season production leaf lettuce <p>The productivity of vegetable cropping systems can be assessed using multiple criteria. Individual criteria tend to reflect the concerns of food suppliers, such as farmers, or consumers. Occasionally, steps taken to enhance productivity from a food supplier point of view result in losses from a consumer point of view and vice versa. Creating vegetable production systems that most effectively balance the interest of all within the food supply-consumption chain requires a thorough understanding of forces that shape various aspects of system productivity and efficiency. The need for such understanding is particularly high in the evaluation of emerging production systems such as ones operating fall through spring in the Great Lakes Region. Moreover, studies tend to focus on specific aspects of productivity and often address only a supply or consumption perspective. In this work, we set out to complete a more comprehensive assessment that would allow us to determine the potential for enhancing the value of so-called ‘off season’ vegetable production as a driver of economy and health. </p><p>In two related studies, leaf lettuce crops were exposed to varied aerial and subsurface microclimates and nitrogen nutrition. Red-leaved romaine lettuce (Lactuca sativa) cultivars (Outredgeous, Flagship) were direct-seeded into raised beds in fall and spring in Wooster, OH. Multiple harvests were completed across the approximately 4 week experiments. Harvested tissue was frozen, and laboratory measures of anthocyanin, chlorophyll, soluble solids, vitamin C, and total antioxidant power were completed. Microclimate and nutrition impacted both lettuce biomass and composition across different seasons and years. This work encompassed the evaluation of microclimate management treatments using multiple criteria. The effort has improved the record of the impacts of microclimate management techniques on crops from physiological, production, and human health perspectives.</p><p>A third study was completed in order to test the reliability of digital image analysis as a substitute for or supplement to destructive harvest and evaluation in assessing leafy crop yield. A reliable digital image analysis approach could have far-reaching implications for scientists and crop managers. Significant correlations between traditional destructive biomass and leaf area measures of leaf lettuce crops and pixel values of areas within digital images were noted. Techniques tested in this study were most effective when high color contrast was present between leaves and other material in the image and in images where complete leaf canopy closure had not occurred. Digital image analysis may be useful in real-time, non-destructive assessments of early-stage leaf lettuce canopy development. These studies provide evidence of the potential to alter, through root- and shoot-zone microclimate modification and nitrogen nutrition, and describe, through digital image analysis, leaf lettuce biomass accumulation and composition during fall and spring in the Midwest US. Treatments and techniques employed in this work are ready for on-farm use in altered or unaltered forms. Collectively, the results suggest that the capacity and efficiency of vegetable production systems and specific aspects of related research can be improved through microclimate management and digital analysis. It is also clear that multiple components of crop quality are influenced by crop management.</p> 2012-06-25 English text The Ohio State University / OhioLINK http://rave.ohiolink.edu/etdc/view?acc_num=osu1337968793 http://rave.ohiolink.edu/etdc/view?acc_num=osu1337968793 unrestricted This thesis or dissertation is protected by copyright: all rights reserved. It may not be copied or redistributed beyond the terms of applicable copyright laws. |