Effect of Nutrient Deficiency on Growth and Flowering of Phalaenopsis.
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Accession number;99A0922071
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| Title;Effect of Nutrient Deficiency on Growth and Flowering of Phalaenopsis. |
| Author;
YONEDA KAZUO
(Nihon Univ., Coll. Bio-Resour, JPN)
USUI MARIKO
(Miyoshi)
KUBOTA SATOSHI
(Minist. of Agric., For. and Fish., Natl. Res. Inst. of Veg. and Ornam. Plants and Tea.)
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Journal Title;Journal of the Japanese Society for Horticultural Science
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Journal Code:F0626A
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ISSN:0013-7626
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VOL.66;NO.1;PAGE.141-147(1997)
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| Figure&Table&Reference;FIG.4, TBL.3, REF.20 |
| Pub. Country;Japan |
| Language;Japanese |
| Abstract;The effects of N, P, K and Mg on the growth and flowering of Phalaenopsis were investigated. 1. When no nitrogen was supplied, the number and size of fully developed leaves was reduced and defoliation increased, resulting in considerable reduction of total leaf area. The concentration of chlorophyll decreased but no decrease in the number of flower stalks occurred. Roots showed no visible changes, but the total plant dry weight was lighter compared with plants supplied nitrogen. 2. In -P plants, defoliation increased and the production of new ones was curtailed. Phosphorus deficiency induced purple and red coloration of the older leaves, leaf distortion and curling of the leaf apices. Yellowing of an incividual leaf began from its apex and gradually spreaded basipetally to the entire leaf, ending in defoliation. The deficiency symptoms spread upward from the basal leaves of a plant. The area of newly developed leaves was reduced and plant growth was stunted. The dry weight of the plants was also reduced and new roots were not produced. The production of flower stalks was almost completely inhibited. 3. No significant difference in new leaf formation or defoliation was observed among plants supplied or denied potassium. However, the surface area of fully developed leaves tended to become smaller in plants lacking potassium. The production of flower stalks was not affected, but flower stalks tended to develop rather early. Leaves and roots showed no noticeable symptoms of potassium deficiency. 4. Calcium deficiency produced no noticeable change in plant growth and/or production of flower stalks. 5. No noticeable symptoms of magnesium deficiency were observed, but the development of flower stalks was delayed slightly in comparison to the control. (author abst.) |
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