| Summary: | 碩士 === 國立臺灣大學 === 園藝學研究所 === 89 === Summary
The relation between mineral nutrient and chlorotic, chlorotic spot were studied in this research. No application fertilizer and application fish emulsion or seaweed for 1 month and different of N: K ratio affects growth, flowering and photosynthesis. The occurrence of chlorotic and chlorotic spot related to simulated transport and forced (25/20°C) in greenhouse. Use of different medium rise of pH . Understanding the relation between growth of Phalaenopsis and mineral nutrient is in order to reduce the happen of chlorotic and chlorotic spot.
This research was studied the healthy plant of white flowers, pink flowers and Phal. amabilis. All pH of sphagnum moss was low. EC value of sphagnum moss of white flowers was small, content of nitrogen was low and content of potassium was 365 ppm highly. The content of N, P, Ca, Mg in leaf, stem and roots was in reasonable range. The content of K with white flowers and pink flowers was on 0.4-0.65 % which was lower than that of in the precious study；the content of Mn , Zn , Cu were higher than that of in the precious study, except Phal. amabilis. Simulated transport and forced (25/20°C) in greenhouse can bring about chlorotic, chlorotic spot. We found that all element content of chlorotic spot plant was lower than normal plant, especially on that of potassium. The content of potassium in upper and middle leaf was higher than lower leaf. It’s obvious that potassium was insufficient. The content of mineral nutrient in the plants with flower stalk was higher than those of in plants with out flower stalk. If plant has
highly mineral nutrient and light intensity is insufficient, it will not happen flower stalk. In other words, the influence of light intensity on flower stalk emergence is more importance than that of mineral nutrient.
Once no application fertilizer and application fish emulsion or seaweed for 1 month, leaf products chlorotic spot. The chlorotic spot plants percentage could reach 60-70 %. The plants that were low mineral nutrient brought about low of the rate of grow in leaf. Despite we follow to give them fertilizer, they can’t grow as normal plants and it affects quality of flowering.
Sphagnum which is embedded with LECA or perlite in the bottom can promote pH . Fertilized with CaCo3 can induce the absorption of Ca in plant, and reduce the absorption of P. The absorption of K and happening of chlorotic spot are not improved well by used LECA, perlite and CaCo3. Mix of artificial fiber brought about high K in plant and lower chlorotic spot. It’s better than the aboriginal mentioned.
15-10-30(1 g/ L), Johnson’s can bring about good growth, flowering and reduce the happening of chlorotic spot. We arising the concentration of fertilizer with K, the quality of plant growth can be improbability. We suggest to use 20-20-20+ KNO3 that can reduce chlorotic spot and chlorotic. In addition, the content of Phalaenopsis nutrient is most on critical point in Taiwan. Phalaenopsis which were exported to Japan or give water only product chlorotic spot easily. 20-20-20 added Osmocote(14-14-14) can be used in the stress.
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