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Influence of Daily Light Integral, L...

Kohler, Annika E.

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Influence of Daily Light Integral, Light Quality, and Root-Zone Temperature on Young Plant Production.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Influence of Daily Light Integral, Light Quality, and Root-Zone Temperature on Young Plant Production./
Author:	Kohler, Annika E.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2020,
Description:	132 p.
Notes:	Source: Masters Abstracts International, Volume: 82-03.
Contained By:	Masters Abstracts International82-03.
Subject:	Horticulture. -
Online resource:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=28088229
ISBN:	9798664738988

Influence of Daily Light Integral, Light Quality, and Root-Zone Temperature on Young Plant Production.
Kohler, Annika E.

Influence of Daily Light Integral, Light Quality, and Root-Zone Temperature on Young Plant Production. - Ann Arbor : ProQuest Dissertations & Theses, 2020 - 132 p.

Source: Masters Abstracts International, Volume: 82-03.

Thesis (M.S.)--Michigan State University, 2020.

This item must not be sold to any third party vendors.

Young ornamental plants and herbs are propagated from seeds and unrooted cuttings in greenhouses. Previous research has determined that the photosynthetic daily light integral (DLI) and air average daily temperature (ADT) set point should be ~10 mol·m-2·d-1 and ~24 °C, respectively, for most ornamental plants. However, young plant recommendations are lacking for air ADT and root-zone heating (RZH) set points for cold-tolerant crops, appropriate DLIs for herbs, and the minimum duration of far-red (FR) radiation needed during the seedling stage to induce long-day plants (LDPs) into flower. Therefore, our objectives were to 1) determine if cold-tolerant crops can be rooted at a lower air ADT with RZH, 2) quantify how DLI influences rooting of herb cuttings, and 3) determine the minimum duration of supplemental lighting (SL) providing FR radiation during seedling production to hasten subsequent time to flower of LDPs. High-quality calibrachoa, nemesia, nepeta, and osteospermum rooted cuttings were produced at an air ADT and RZH temperature of 16 and 24 °C, respectively, while campanula, petunia, and phlox were successfully propagated at an air ADT and RZH set points of 16 and 21 °C and 21 and 27 °C, respectively. A DLI of 10 to 12 mol·m-2·d-1 produced high-quality liners of oregano, rosemary, sage, spearmint, and thyme. Seedlings of calibrachoa, petunia, and snapdragon were taller when grown under FR SL for ≥14 d and subsequent flowering was hastened by 3 to 8 d under FR SL for 28 to 35 d compared to seedlings under high-pressure sodium lamps for 28 to 35 d. These results provide further insight for greenhouse growers that want to produce high-quality liners and seedlings without sacrificing finish plant quality.

ISBN: 9798664738988Subjects--Topical Terms:

555447
Horticulture.
Subjects--Index Terms:

Daily light integral

Influence of Daily Light Integral, Light Quality, and Root-Zone Temperature on Young Plant Production.
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520 $a Young ornamental plants and herbs are propagated from seeds and unrooted cuttings in greenhouses. Previous research has determined that the photosynthetic daily light integral (DLI) and air average daily temperature (ADT) set point should be ~10 mol·m-2·d-1 and ~24 °C, respectively, for most ornamental plants. However, young plant recommendations are lacking for air ADT and root-zone heating (RZH) set points for cold-tolerant crops, appropriate DLIs for herbs, and the minimum duration of far-red (FR) radiation needed during the seedling stage to induce long-day plants (LDPs) into flower. Therefore, our objectives were to 1) determine if cold-tolerant crops can be rooted at a lower air ADT with RZH, 2) quantify how DLI influences rooting of herb cuttings, and 3) determine the minimum duration of supplemental lighting (SL) providing FR radiation during seedling production to hasten subsequent time to flower of LDPs. High-quality calibrachoa, nemesia, nepeta, and osteospermum rooted cuttings were produced at an air ADT and RZH temperature of 16 and 24 °C, respectively, while campanula, petunia, and phlox were successfully propagated at an air ADT and RZH set points of 16 and 21 °C and 21 and 27 °C, respectively. A DLI of 10 to 12 mol·m-2·d-1 produced high-quality liners of oregano, rosemary, sage, spearmint, and thyme. Seedlings of calibrachoa, petunia, and snapdragon were taller when grown under FR SL for ≥14 d and subsequent flowering was hastened by 3 to 8 d under FR SL for 28 to 35 d compared to seedlings under high-pressure sodium lamps for 28 to 35 d. These results provide further insight for greenhouse growers that want to produce high-quality liners and seedlings without sacrificing finish plant quality.
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