EFFECTS OF TEMPERATURE DURING SEEDLING STAGE ON GROWTH AND NUTRIENT ABSORBANCE OF GERBERA JAMESONII GROWING IN ORGANIC SUBSTRATE

摘要

The effects of different temperature treatments during the seedling stage on growth and nutrient absorbance of Gerbera jamesonii cv 'Sunshine Coast' growing in the organic substrate were investigated. The temperature treatments were conducted in growth chamber where the day/night temperature were set to 15/10, 20/15, 25/20, and 30/25 degrees C individually. The results showed that the fresh and dry weight of aboveground part and that of roots, average number of leaves and lateral roots were greater at 30/25 degrees C than other treatments. The highest level of macro elements nitrogen (N), phosphorus (P), and potassium (K) in the leaf samples were also detected at 25/20 degrees C and 30/25 degrees C. However, there was no significant influence of different temperatures on zinc (Zn) levels in leaves. In general, the day temperature 25 similar to 30 degrees C and night temperature 20 similar to 25 degrees C are thought to be the better temperature condition for gerbera growth as well as the nutrient uptake and accumulation in the plants during the seedling stage.