What to do with the rotten roots of osmanthus
Every golden autumn season, the fragrance of osmanthus always evokes people's beautiful yearning for nature. However, potted osmanthus flowers often have rotten roots due to improper maintenance, which not only affects flowering, but even causes plant death in severe cases. This article will systematically analyze the four major causes of osmanthus rotted roots and provide scientific and effective prevention and control plans. The choice of flowerpots is a fatal hazard of poor permeability of roots. Although porcelain flowerpots are beautiful, they have poor permeability and can easily cause soil hardening after long-term use. When the water content of the basin soil exceeds 30%, root respiration is blocked and anaerobic metabolism occurs, leading to cell necrosis and formation of rotten roots. Scientific selection of pots recommends using red pottery pots or purple sand pots, with a porosity of 15%-20%. If decoration is needed, the "pot setting method" can be used: the inner layer is planted with a plain burning pot, and the outer layer is covered with a porcelain pot. There must be 3 - 5 drainage holes on the bottom of the basin and a 3cm thick ceramsite layer must be laid. Key points of water management The golden rule of watering Keep soil moisture at 40%-50% in spring and autumn, and increase it to 60% in summer. The principle of "seeing dry, seeing wet" is adopted: water when the surface soil is 2cm dry, and water will stop every time until the bottom of the basin seeps. When installing the PV drain pipe, the pipe diameter should be 1/10 of the basin diameter. The first aid plan for rotten roots will remove the pot immediately after discovering rotten roots, disinfect the knives with 75% alcohol, and remove the browning roots. Keep at least 1/3 of the healthy root mass, soak it in carbendazim solution (1: 800) for 30 minutes, and then replace it with new soil for planting. Disease identification characteristics of comprehensive prevention and control of root rot diseases in the early stage, the leaves lose green and curl, and the root bark falls off in a water-stained manner in the later stage. Most of the pathogenic bacteria are Fusarium, which easily erupt in acidic soil with pH <5.5. Prevention and control technical system Apply sulfur powder (50 g/㎡) to adjust the pH value before spring germination. During the onset period, roots were irrigated with 200 times solution of 25% ammonium, once every 10 days for 3 consecutive times. Biological control can be inoculated with Trichoderma (10 CFU/g). Scientific Fertilization Guidelines Mechanism of Fertilizer Damage When excessive nitrogen fertilizer causes the EC value to exceed 2.5mS/cm, osmotic stress will occur. Undecomposed organic fertilizers will release hydrogen sulfide to poison the roots. The precision fertilization plan applies soybean cake water (1: 50) or compound slow-release fertilizer (N-P-K = 15 - 15 - 15) every month during the growth period. Additional phosphorus and potassium fertilizers were applied to promote flowering in September, and fertilizer was stopped in winter. Water must be thoroughly watered within 24 hours after topdressing.
Through systematic prevention and control, the cure rate of osmanthus rotted roots can reach more than 85%. It is recommended to replace the basin soil every 2 years and regularly test the soil EC value and pH value. If you master the eight-character formula of "ventilation, water control, disease prevention, and thinning fat", you can make the roots of osmanthus osmanthus strong and the branches are full of golden stamens every year.