National Taitung Jr College

Taitung City, Taiwan

National Taitung Jr College

Taitung City, Taiwan
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Peng Y.-L.,National Taiwan University | Liu F.-Y.,National Taitung Jr College | Shen R.-S.,National Chiayi University | Chang Y.-S.,National Taiwan University
HortTechnology | Year: 2015

Nitrogen (N) is a major element required for crop cultivation and an important factor affecting plant growth and development. Malabar chestnut (Pachira macrocarpa) is an important ornamental potted plant crop whose N requirement has been studied, and a rapid monitoring method to manage N fertilization during its commercial production is yet to be established. Malabar chestnut seedlings were fertilized weekly with 0, 4, 8, 16, or 24 mM N. After 12 weeks, 16 mM N was found to yield the greatest plant growth such as plant height, number of nodes, and total leaf area. Measurements of chlorophyll meter readings, leaf chlorophyll concentration, leaf N concentration, and leaf dry weight all indicated that the optimal level of N fertilization was 16 mM N. A chlorophyll meter can be used to monitor nondestructively whether sufficient N has been supplied to support optimal plant growth. In this study, a chlorophyll meter reading of 46.1 corresponded with a critical leaf N concentration of 2.65%, defined as the leaf N concentration when the leaf dry weight was at 90% of saturation point. AdditionalN supplied beyond this critical level increased foliar chlorophyll content and improved the rate of net photosynthesis. Therefore, chlorophyll meter readings, which are convenient and nondestructive can serve as a reliable reference for commercial production in monitoring N requirement for optimum growth of malabar chestnut. Weekly fertilization of malabar chestnut with 16 mM N and maintaining leaf chlorophyll meter readings between 46.1 and 58.4 are recommended. © 2015, American Society for Horticultural Science. All rights reserved.


Liu F.-Y.,National Taitung Jr College | Peng Y.-L.,National Taiwan University | Chang Y.-S.,National Taiwan University
Korean Journal of Horticultural Science and Technology | Year: 2015

This study examined the effects of different day/night temperature regimes or silver ion on growth and flowering of passion fruit ‘Tai-nung No.1’. Low temperature treatment (20/15°C) caused passion fruit cultivar ‘Tai-nung No.1’ to fail to flower. Flowering induction occurred within a temperature range of 20-30°C, with no significant difference in the days to first flower bud and the total number of flower buds between plants grown at 30/25°C and 25/20°C. However, plants grown at 30/25°C exhibited their first flower buds set on the higher nodes and had higher abortion rates of flower buds than those at 25/20°C. Plants grown at 30/25°C had the most rapid growth and the shortest plastochron. We also evaluated the effect of the ethylene response inhibitors silver nitrate (AgNO3) and silver thiosulfate (STS) on growth and flowering of potted passion fruit ‘Tai-nung No.1’, when they were exposed to low temperature conditions (20/15°C) following chemical treatments (AgNO3 or STS, at 0.5 or 1.0 mM). AgNO3 and STS treatments induced flower formation and initial flower bud formation within approximately two weeks at 20/15°C whereas non-treated control plants exhibited no flower formation. ACC content and activity of ACC oxidase in the leaves of passion fruit ‘Tai-nung No.1’exposed to low temperature conditions (20/15°C) were significantly inhibited by the ethylene inhibitor treatments. These results indicate that ethylene, which is produced under low temperature conditions, plays an important role in inhibiting flower formation in passion fruit. © 2015 Korean Society for Horticultural Science.

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