Analysis of preliminary experimental results on potassium nutrition

1. K+ isorchidindispensable for bud growth; K deficiency reduces the bud growth rate. However, different potassium ion concentrations showed no difference in bud growth. 2. K+ and leaf growth rate Orchid plants grown under potassium deficiency exhibit small leaf area and thin circumference, and the plants appear relatively small and frail. K application showed a growth-promoting effect during this period, especially for plants whose growth was originally not very good. 3. Disease incidence survey Inorchidsgrown under potassium deficiency (0mM) and low potassium (0.1mM) conditions, the incidence of anthracnose was high. According to July statistics, the incidence rates were 50% and 36.4% respectively; in August they were 58.3% and 54.6% respectively. Under other K-supplied culture conditions, the incidence rate was below 20%. (Ye Qingsheng, Pan Ruichi)