Leaf Lettuce Yield Is More Sensitive to Low Daily Light Integral than Kale and Spinach
| Autor: | David A. Baumbauer, Macdonald H. Burgess, Colleen B. Schmidt |
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| Rok vydání: | 2019 |
| Předmět: | |
| Zdroj: | HortScience. 54:2159-2162 |
| ISSN: | 2327-9834 0018-5345 |
| Popis: | Kale, leaf lettuce, and spinach were grown for 28 days in growth chambers under daily light integrals (DLI) of 8, 10, 12, and 14 mol·m−2·d−1. Fresh weight (FW), dry weight (DW), leaf area, and chlorophyll concentration were measured. Increasing DLI positively influenced lettuce FW; an increase from 1.27 g/plant to 4.33 g/plant was measured. DW for all species increased in a linear fashion under increasing DLI, with lettuce increasing 203%, kale 47%, and spinach 42% as DLI increased from 8 to 14 mol·m−2·d−1. Leaf area response was species-dependent, with lettuce leaf area increasing under increasing DLI while kale leaf area decreased under higher DLI. Chlorophyll levels in kale leaves decreased from DLI of 8 to 12 mol·m−2·d−1, and then increased to 14 mol·m−2·d−1 DLI. Chlorophyll content in kale leaves had a nonlinear response to DLI and the best fit was with a quadratic model. Growers wanting to add supplemental lighting can expect the greatest gains in lettuce yield compared with those of kale and spinach. |
| Databáze: | OpenAIRE |
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