Growth responses as affected by different ion strengths of nutrient solution with growth stage of hydroponically grown Dendranthema grandiflorum cv. Chungwoon

摘要

This study was conducted to investigate the effects of different ionic strengths of nutrient solution on the growth and development of hydroponically grown chrysanthemum cv. Chungwoon. The strength of nutrient solution was appled differently at three stages, namely, transplanting, budding, and flowering. Nine treatments were investigated: (A) 1.0->1.0->l.0X, (B) 1.0->1.3->1.3X, (C) 1.0->1.6->1.6X, (D) 1.3->1.0->1.0X, (E) 1.3->1.3->1.3X, (F) 1.3->1.6->l.6X, (G) 1.6->1.0->l.0X, (H) 1.6->1.3->1.3X, and (I) 1.6->1.6->1.6X. The plant growth in terms of plant height, number of leaves, and leaf area was better in ionic strength of 1.3 and 1.6 times in each stage than in the constant value of 1.0. Flower diameter of 8.9 cm was the highest in 1.6 strengthin all stages. Fresh and dry weights were greatest in the F treatment. Contents of total nitrogen and Ca in the leaf were highest in 1.6 time in all stages, showing 3.33 and 9.02 percent, respectively. P content of 1.16 percent in the leaf was the highest in 1.3 strength during the trans plating stages and 1.6 strength during the budding and flowering stages. As a result, increasing ionic strength of nutrient solution at three stages are most effective in hydroponic chrysanthemum production using rice hull as media.