Study Of Different Fertilization And Irrigation Effect On Quality Of Yellow Lily And Its Mechanism

Asian yellow lily (Lilium sp. cv. Mirella) taken as an experimental plant for our study in the greenhouse, effects of fertilization and irrigation methods on morphology, fresh weight, leaf and petal starch, soluble sugar, malondialdehyde (MDA) and protein content of lily freshly cut flower were studied. The main results are outlined as follows:1. Applied K increases the quality of lily freshly cut flower. Leaf area, leaf numbers, plant height, flower diameter and lifespan of lily cut flower increases with the raised K fertilizer. Applied K increases leaf and petal starch and soluble sugar content and leaf protein content, but reduces leaf MDA content. During the period of cut flower in vase, applied K also delays the reduction of leaf and petal starch and soluble sugar content and leaf protein content and the increase of petal MDA content.2. Combined N with K in different growth stages also affects the quality of lily freshly cut flower. B₂ treatment i.e. 1/2 N applied in early period, 1/2 K in middle period and 1/2 N + 1/2 K in later period was the best treatment for lily morphology, but B₁ treatment i.e. 1/2 N applied in early period, 1/2 N + 1/2 K in middle period and 1/2 K in later period is the lowest treatment for the lily morphology. Leaf and petal starch and soluble sugar content and leaf protein content in B₂ treatment is higher but MDA content is lower than those of the other two combined N with K treatments in different growth stages. And B₂ treatment delays the reduction of leaf and petal starch and soluble sugar content during the period of cut flower in vase.3. Under different K levels and N combined with K in different growth stage condition, leaf soluble sugar content in drought (lower irrigation) treatment after bud appearing period is greater than those of normal irrigation treatment, and drought treatment delays the reduction of leaf soluble sugar content.