In the process of orchid maintenance, reasonable fertilization is one of the key links to ensure the healthy growth and flourishing of orchids. Potassium dihydrogen phosphate and urea play an important role in orchid cultivation as two commonly used fertilizers. They can not only supplement the nutrients needed by orchids, but also promote root development and flower bud differentiation of orchids. However, when spraying these two fertilizers together, the concentration of these two fertilizers has become the focus of attention. In this paper, we will discuss the appropriate concentration of mixed spraying of potassium dihydrogen phosphate and urea in orchids, in order to provide a reference for the scientific fertilization of orchids.
1. The role of potassium dihydrogen phosphate and urea
Potassium dihydrogen phosphate is a trace element fertilizer, rich in phosphorus and potassium, mainly used for foliar sprays or root topdressing. Phosphorus is essential for root development, flower bud differentiation and fruit formation in orchids, while potassium helps to improve the stress resistance of orchids and enhance the plant's resistance to pests and diseases. Therefore, potassium dihydrogen phosphate plays an indispensable role in the growth of orchids.
Urea is a high-nitrogen fertilizer that mainly promotes the vegetative growth of orchids, making orchids grow robust and leaves green. Nitrogen is an important component of plant protein and has an important impact on the metabolism and growth and development of orchids. However, high-nitrogen fertilizers can also increase the susceptibility of orchids to pests and diseases, so caution is required when using them.
2. Precautions for mixed spraying
When spraying potassium dihydrogen phosphate and urea together, the following points need to be noted:
1. Concentration control: The leaves of orchids are extremely sensitive to fertilizer concentration, and too high concentration is easy to burn the leaves, resulting in fertilizer damage. Therefore, the concentration needs to be tightly controlled when spraying mixtures.
2. Period selection: The action period of potassium dihydrogen phosphate and urea is different, and the appropriate spraying period should be selected according to the growth stage and needs of orchids. In general, potassium dihydrogen phosphate is used in the fall when flower buds are formed, while urea is used after the orchid has flowered.
3. Weather and seedling conditions: The spraying concentration needs to be adjusted according to the weather conditions and orchid seedling conditions. For example, during the summer high temperature period and the winter dormant period, orchids grow slowly, and fertilization should be reduced; The old orchid seedlings have strong fertilizer tolerance and can increase the concentration appropriately.
3. Discussion of appropriate concentrations
The mixed spraying concentration of potassium dihydrogen phosphate and urea should be adjusted according to the actual situation, but the following suggestions can be used as a reference:
1. The concentration of potassium dihydrogen phosphate: it is recommended not less than 0.2%, that is, 2 grams of potassium dihydrogen phosphate are added to each liter of water. This concentration can not only meet the orchid's need for phosphorus and potassium, but also avoid leaf burns.
Concentration of urea: it is recommended not less than 0.1-0.2%, that is, 1-2 grams of urea per liter of water. This concentration range promotes vegetative growth of orchids without increasing the risk of pests and diseases.
In actual operation, Lan friends can fine-tune the concentration according to factors such as weather and seedling conditions. For example, in the period when the weather is cooler and the orchid grows vigorously, the concentration can be appropriately increased; During periods of hot weather and slow growth of orchids, the concentration should be reduced.
4. Concentration adjustment in practice
In practice, Lanyou found that even if the fertilizer concentration was higher than the recommended concentration, such as 0.3-0.5% orchid, there was no obvious fertilizer damage. However, this does not mean that all orchids can tolerate high concentrations of fertilizers. Factors such as the variety of each orchid, the environment in which it grows, and its health status will affect its tolerance to fertilizers. Therefore, orchid friends should gradually adjust the concentration according to their own orchid situation in practice and find the most suitable fertilization plan for their orchids.
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