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Poinsettia's Common Fertilizers and Common Nutrition Deficiency
1. Common fertilizers Poinsettia is a nitrogen-potassium nutrient type and has a high requirement for nitrogen ratio. It is relatively easy to absorb potassium and requires a certain ratio of nitrogen to potassium. Due to the higher requirements for fertilization, current domestic and foreign manufacturers of poinsettia use long-term controlled fertilizers developed by professional companies. There are two ways to use the long-term controllability. One is to pre-mix in a certain proportion in the cultivation medium, and the other is to place on the surface of the cultivation medium. Commercial Poinsettia Special Fertilizer Introduction: Special Fertilizer Nitrogen: Phosphorus: Potassium Application Method Aolu Fertilizer No. 301 No. 301 No. 151 Basal Ao Fei Fertilizer No. 501 No. 5-10 No. Base Fertilizer No. 3 No. 15 No. 20-25 No. of Top Dressing No. 8 —10—20 The fertilizing period of top-dressing osmocote can be maintained from 3-4 months to 6 months. Therefore, it is best to use it as a base fertilizer to mix well with the cultivation medium. The world’s largest horticultural fertilizer manufacturer, Scotts, USA, addresses poinsettia. The growth characteristics and the need to absorb various nutrient elements to produce special fertilizers for poinsettia use a lot of peters to match the vegetative growth phase of poinsettia and is suitable for top-dressing applications. Second, the common nutrient deficiency element deficiency nitrogen (n) grows slowly, the leaves are evenly yellowed, and the leaves fall from the lower leaves. Phosphorus (p) reduced leaf area, upper leaf dark green, immature leaf necrosis. Potassium (k) leaves are yellowed and scorch on the lower leaf margin, and are necrotic from the leaf margin to the veins. Calcium (ca) leaves turn dark green, soft, distorted, gangrene. Magnesium (mg) lower leaves, yellowing between veins. The young leaves of iron (fe) become light green evenly. Manganese (mn) young leaves pale green, veins remain green. Zinc plants are dwarfed and new leaves yellow. Boron (b) dwarfs plants and stops growing. The molybdenum (mo) mature leaves yellow and the upper leaf margin is involute and scorch. The production of poinsettia in the greenhouse is most likely to be caused by magnesium deficiency or trace element deficiency disease. The symptoms of magnesium deficiency are that the edges of large leaves begin to yellow and browning occurs at the edges of the lower leaves. The solution can increase the sulfuric acid by 3000 times when applying multiple fertilizers. Magnesium solution. The demand for trace elements in poinsettia is higher for molybdenum. Especially during flowering, molybdenum can increase the size and brightness of the poinsettia bracts, which can be solved by spraying sodium molybdate (0.2ppmmo).