Growing environment of four seasons orchid

The original growth environment of Siji orchid is the primitive jungle near the top of the mountain to the east or south with a little sunshine, while the valley is dark and humid. According to this conjecture, its luminosity is about 10 ~ 30,000 LUX, if the shading rate is calculated, 80% plastic shading can achieve the same effect. The temperature in flat land is higher, and the shading rate in summer needs to be increased by another 10%. Avoid leaf yellowing caused by excessive luminosity.

The growth temperature of Cymbidium is the most ideal from 15 to 30 degrees, up to 40 degrees and 0 degrees as low as 0 degrees. Need to prevent cold damage in winter, frost and snow areas, Lanxuan need to be surrounded by double-layer plastic film fence, equipped with electric hotlines or warm water pipes to warm or move indoors to avoid the cold, otherwise there is a risk of frostbite. Although it can withstand a high temperature of 40 degrees in summer, the relative respiration is more exuberant. Generally speaking, for each increase of 10 degrees above 10 degrees, the respiration increases by 2 to 3 times, and the higher the respiration, the faster the metabolic rate and the higher the consumption of water and nutrients. Cooling and ventilation are particularly important during the high temperature period in summer. In addition to increasing the shading rate, fan exhaust and roof water spraying, removing rain shelter facilities to allow natural ventilation is also the best way to cool the temperature.

The vegetative growth of Cymbidium needs high temperature, while the reproductive growth depends on the temperature difference between day and night. As the temperature difference affects cell division and nutrient storage, it can affect the germination rate and flowering in the coming year, especially in winter, the temperature difference is best controlled at 10 degrees. In areas where the temperature difference between day and night is small, the effect can be achieved by increasing sunshine during the day and natural ventilation at night. On the contrary, if the temperature difference between day and night is more than 15 degrees, it will also cause the withering of new buds and the aging of adult plants, so it is necessary to keep warm at night.

Although the dark and wet valley bottom is not conducive to the growth of orchids, it does not mean that orchids like to be dry. Its native climate has abundant rainfall in summer, and it also has morning and twilight fog to supply its annual growth in dry winter. In other words, the spring and summer growing season still needs plenty of water, even if the plum rain does not hinder the development of its roots, all it needs is good drainage and ventilation. At the turn of summer and autumn, it coincides with the period of flower bud differentiation, too much water will affect the absorption of phosphorus and calcium fertilizer and reduce the flowering rate. If you want to promote flowers, you must appropriately control the number of watering. The temperature is low in winter, so it is more suitable for sex cultivation because of less water evaporation in winter, high water content in roots, and easy to freeze to death in case of frost and snow.

Watering method, the first heavy "bottom", not only the bottom of the basin to water, the medium needs to be completely drenched. Uneven drying and wetting are prone to mildew and root rot. The basin surface and leaves need to be more wet than wet, if the normal humidity and poor ventilation, it is easy to cause diseases. Watering times, depending on basin size, medium water content, humidity level. Consider the intensity of light, temperature and ventilation.

The quality of water quality is also an important key to affect the growth of orchid. The quality of water quality is judged by PH value (pH) and EC value (conductivity). The PH value suitable for orchid growth is between 5 degrees and 8 degrees, and weak acid (below 5 degrees) or strong alkali (above 8 degrees) will make the roots hollow or harden and affect the growth. EC value, commonly known as impurities, is still good in 200PPm with Qianqin water quality; when 300PPm is above, vascular bundles will be blocked, resulting in stagnation of new bud growth and yellowing of adult leaves. To determine the water value, you need to use a special instrument or ask the waterworks to identify.

Acid rain protection needs to be more cautious. The formation of acid rain often occurs when there is no rain for a long time, and sudden showers carry polluted air, leaving black spots on the leaves. Extra care should be taken in areas where there is no rain shelter or where Rain Water is vulnerable to splash. in case of a situation, it should be thoroughly watered immediately to dilute the concentration of rain acid. (Liu Qingyong)