The cultivation of Phalaenopsis has changed especially by allowing more light during cultivation, which increases the risk of disease. Resilience of plants can be increased through appropriate cultivation measures.
Nitrogen level and quality
Six Phalaenopsis cultivars are grown under high light levels at three nitrogen levels 14, 20 and 26 mmol l-1 nitrogen at 2 EC levels (EC 1 and EC 1.7). A higher EC resulted in a larger leaf area, more fresh weight, and also a slightly greater length / width ratio of the leaves, but did not affect their number.
Nitrogen resulted in more leaves and higher leaf area, more flowers and buds and more fresh leaf weight, but less root weight. Cultivar-dependent necrosis of flower stems developed at the highest nitrogen levels yielding non-marketable plants, but not at low nitrogen levels.
Based on these results, a nutrient solution is recommended with an EC of 1.0 with 14 to 20 mmol N.
Diseases and shelf life
Fertilization treatments had no effect on the occurrence of Pseudomonas or Botrytis, although there were differences observed in the susceptibility of the various cultivars.
The fertilization treatments had no effect on the shelf life of the plants.
Research is sponsored by Productschap Tuinbouw