Fertilization technology of rhododendron

Cuckoo root is delicate, fertilizer must be cooked before it can be used. Generally, it is more suitable to use retting fertilizer which has been fully fermented for more than one year. Five points should be paid attention to in fertilization:

Look at the seedlings fattening. The seedlings can not be fertilized, and the liquid barnyard manure which is well retted and extremely thin can be applied after 4 months. After the plants are set and planted in the next spring, more nitrogen and potassium fertilizer should be applied to accelerate vegetative growth. Phosphate fertilizer should be applied in 2 ~ 3 years of adulthood to make the flower rate high and the flower large and colorful. In the old age, more nitrogen fertilizer can be applied to promote the renewal of branches and leaves, rejuvenate the tree and prolong the age of the tree.

Fertilize at the right time. Light fertilizer mainly composed of nitrogen and potassium was applied from early spring to March to promote its branches and leaves to germinate. 4 from May to May, the branches and leaves were luxuriant and the roots germinated rapidly, and phosphate fertilizer was the main fertilizer, potassium fertilizer was used as a supplement, once every 5 days; fertilization was stopped during the summer dormancy period; thin phosphate and potassium fertilizer was applied again every 10 days during the autumn growth period from 8 to September, and bean cake and other basic fertilizers could be applied once in early winter.

Thin fertilizer and little fertilizer. The root system of rhododendron is as thin as hair, and fertilization is required less and less in the whole growth process. If the dosage is high, the concentration is high, not only can not be absorbed by the root, but will produce reverse osmosis, the cell liquid in the plant will be poured out, burn the root hair, yellow leaves, dry shoots and even die. In case of this situation, should immediately stop fertilizer, continuous watering, dilute fertilizer liquid, in order to save.

Use base fertilizer carefully. For 2 Mel-3-year-old azaleas, 3 cm deep trenches can be dug along the basin wall in early winter, and a small amount of base fertilizer mixed with cooked livestock, poultry and bean cakes can be applied once, covered with thin soil, and then slowly soaked into the soil with watering. Because the fertilizer absorbs sunlight and heat, it produces heat at night, which is also conducive to plant growth in winter.

Control water before fertilizer, flood after fertilizer. The basin soil is required to be dry before fertilization, otherwise the fertilizer can not be diffused in the mud, ventilation and water permeability is hindered, and the roots are easy to rot. After fertilization, heavy water can be poured the next morning, so that the fertilizer can be fully permeated and dissolved, which is beneficial to plant absorption.

In particular, it is worth mentioning that cuckoos like "green, fat and water". Large vats or cement ponds can be used to soak vegetable leaves, grass, melon peel, orange peel, rapeseed cake, etc., covered with plastic film to increase heat through sunlight and fully ferment retting. Then take the supernatant, in each normal application of fertilizer solution, add 1 beat 5 green fertilizer and water, the effect is significant. Green manure is rich in organic matter, slightly acidic, moderate fertility, does not hurt the root system, and can make the plant grow healthily.