The rhododendron roots are delicate and the fertilizer must be ripe before use. Generally, it is suitable to use a fermented fertilizer for more than one year. Fertilization should pay attention to the following five points:
See Miao to Fei
The seedlings can not be fertilized. After 4 months, the well-dried and extremely thin liquid manure can be applied. After the next year's planting, the nitrogen and potassium fertilizers should be applied to accelerate the vegetative growth. In the adult period of 2 to 3 years, phosphate fertilizer should be added to make the flower rate high and the flower color bright. In the old age, more nitrogen fertilizer can be applied to promote the renewal of branches and leaves, to rejuvenate the trees, and to extend the age of the trees.
Timely Fertilization
In the early spring from February to March, the application of nitrogen and potassium-based light fertilizers promotes the germination of the branches and leaves; from April to May, the growth and development period is flourishing, the branches and leaves are flourishing, and the roots are germinated rapidly. It is better to use phosphate fertilizer as the supplement, and potassium fertilizer as the supplement. 5 days once; stop the fertilization in the dormant period of the summer; apply the thin phosphorus and potassium fertilizer in the growing season in the autumn of August to September, once every 10 days; the base fertilizer can be applied once in the early winter.
Thin Fertilizer Shaolin
The rhododendron roots are as thin as hair, and the fertilization is required to be less and less throughout the growth process. If the dosage is high and the concentration is high, not only can it not be absorbed by the root system, but reverse osmosis will occur, and the cell fluid in the plant body will be sucked out, the root hair will be burned, and yellow leaves, dry tips and even deadness will appear. In this case, immediately stop the fertilizer, continue to water, dilute the fertilizer, in order to save.
Use the base fertilizer
For the 2 to 3 year old azaleas, every year in the early winter, along the basin wall, 3 cm deep ditch, apply the base fertilizer mixed with less and lightly cooked livestock and poultry manure and bean cake, overlying the thin soil, and then slowly with the watering. Slowly immersed in the soil. Because the fertilizer absorbs sunlight and heat, it produces heat in the evening, which is also beneficial to the winter growth of the plants.
Pre-fertilizer water control, fat after Dashui
Before the fertilization, the potting soil is required to be dry, otherwise the fertilizer will not spread in the sludge, and the ventilation and water permeability will be hindered, and it is easy to rotten. After fertilization, the next morning, water can be poured to make the fertilizer fully penetrate and dissolve, which is beneficial to plant absorption.
It is particularly worth mentioning that Du Fu likes “green manure waterâ€. You can use a large tank or cement pool to soak amaranth leaves, grass, melon skin, orange peel, rapeseed cake, etc., and cover the plastic film, increase the heat through sunlight, and fully ferment the ripe. Then, the supernatant liquid was taken, and 1/5 of the green fertilizer water was added to each of the normally applied fertilizer liquids, and the effect was remarkable. Green manure is rich in organic matter, it is slightly acidic, and its fertility is moderate. It does not damage the root system and can make plants grow robust.
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