The Law of Water requirement in the cultivation of Cymbidium

After understanding some basic theories of water metabolism of Chinese orchid, the water requirement law of national orchid cultivation was found out in cultivation practice. The root system of the orchid plant constantly absorbs water to the cultivation substrate to meet the needs of various physiological processes. Its water requirement varies according to its species and development period, and too much or too little supply is disadvantageous to the orchid plant. Therefore, when the plant needs more water, it should provide an appropriate amount of water. Generally speaking, when orchid plants are planted in pots or mountains, the first thing is to put the orchid plants in a shady place and let the free water of their roots dry naturally. First, the wounds of the injured orchid pole form a protective layer, which is not easy to be infected by pathogens. And reduce the number of pathogens. The second is to make the root system a little softer and easier to plant. The cultivation substrate is divided into large, medium, small and medium. When planting, the large size substrate is placed at the bottom of the planting container, the medium size substrate is placed in the middle, and the small size substrate is placed on the top layer, which is convenient for root fixation, growth and water absorption. The middle and lower layers are hydrophobic and breathable to meet the physiological requirements of Langen. After planting, soak the pot in a container for 15 minutes, then get out of the water up and down and into the water many times, so that the impurities in the matrix that are easy to harden or block the outlet hole and cause stagnant water are removed, and then, sprinkle the orchid plant with a faucet until the water flowing out of the basin hole is clear. Put it in the orchid shed and let it air-dry until the surface of the substrate whitens before watering to replenish water. This is mainly to let the substrate dry slightly, which is the same as the air-dried planting of the root system, because the reporting system is damaged to varying degrees in the planting process, and it is a more effective way to prevent wound infection. If not treated in this way, the damaged old roots may all rot, affecting the growth of orchid plants.

In fact, the nutritional area of the smaller orchid plant is small, the water consumption is small, and the water demand is smaller. During the peak period of vegetative growth, the water demand increases. The decline of water demand in the aging period of plants or some old, weak, sick and disabled plants should be treated separately in management.

Watering should be suitable for the growth of orchid plants, and the gap time should not be too long in order to promote the continuous growth of orchid plants. The amount of watering should not be too much, and too much water will lead to the adverse consequences of hypoxia in the cultivation substrate. Watering should pay attention to water quality and water temperature. Water pollution or too low water temperature is disadvantageous to Chinese orchids. It is generally believed that Rain Water is the best, but Rain Water has some difficulties in collecting and storing them in large quantities, and now the air pollution is serious, Rain Water is not necessarily pure. Now that the water quality is better is the well water, the water temperature is also relatively constant. Tap water contains too much chloride directly watering orchids will cause harm, so the tap water should be placed for a period of time, so that the chloride in the water can be released before it can be used.

When watering the forest water by spraying, the pressure should not be too great, it will not damage the new buds and young leaves, but also scour the cultivated plant material to expose the orchid root. In some high-end orchid rooms, regular humidification is adopted, which requires that the cultivation substrate is more flowing and ventilation should be strengthened. In this case, natural ventilation can not meet the requirements, it is necessary to install ventilation devices such as fan and exhaust fan. It is generally believed that the degree of humidification of Chinese orchid cultivation sites requiring automatic humidification is that the leaves of orchids are not stained with water or wet stains. This is because too wet orchid leaves for a long time will affect photosynthesis, respiration and normal physiological function of roots, and easily cause "water injury" of orchid leaves and increase the chance of disease infection. Usually the humidity controlled by the orchid chamber is 70%-90%, which can promote the root development of the orchid plant. Some constant temperature Lanhuang who need to be cooled by air-conditioners, because the air humidity must be reduced, which is easy to cause atmospheric drought, humidifying devices should be installed on the equipment to balance. The more successful cooling method is to use water limestone to cool down.

As the microclimate is different in different places, the water management measures taken to meet the water metabolism of orchids are also heavy, so it is necessary to create a set of feasible system management scheme to meet the water requirements of orchids. (Liu Zhongjian)