Effective ventilation measures for orchid cultivation

Orchidsmust be in fresh air to carry out respiration and photosynthesis normally, promote metabolism, enhance the absorption and transport of water and nutrients, and the manufacture and accumulation of nutrients, reducepests and diseases, so that the orchid plants grow strong and healthy. Therefore, good ventilation and air exchange can ensure fresh air and groworchids。

1. Orchid plants are mostly infected with diseases because the temperature and humidity of the micro-environment are too high, stuffy and unventilated, allowing pathogens and pests to spread quickly, especially aphids, whiteflies, scale insects, brown spot disease, white silk disease and so on are the most obvious.

2. Ventilation of the site and the shade shed. The site should be as spacious as possible and on high ground. The flower stand can be built with bricks and stones, or empty flower pots can be placed upside down, with the orchid pots placed on them, so that the orchid pots are 20 cm to 40 cm above the ground. Especially in poorly ventilated places, the orchid pots should be placed as high as possible. Bamboo blinds and bamboo fences are used for the shade shed; they are cheap and good, and provide good ventilation.

3. If indoor ventilation and air exchange are poor, the proportional relationship of the various gases in the air will change, harmful gases will increase, and useful gases will decrease, affecting theorchid'sgrowth and development, making it susceptible to mold, rot and other diseases, and it may even suffer poisoning. In houses, closed plastic sheds or glass sheds, especially those heated with coal, when the indoor temperature exceeds 10°C, windows should be opened or the film lifted every day. In winter, in rooms tightly closed on all sides, an electric fan should also be used for directional exhaust ventilation when the temperature is high at noon. The temperature in a greenhouse is generally higher at the top and lower at the bottom, so the air inlet should be at the lower part and the air outlet at the upper part; the ventilation speed is fast, and harmful gases are removed more thoroughly. Note that while ventilating, water spraying should also be coordinated, the relationship among ventilation, heat preservation and moisture retention should be handled well, and direct blowing of cold air should be prevented. The density of orchid pots placed indoors should be sparse rather than dense, and sufficient distance should be maintained. If the area is narrow, the flower stand can be built in a stepped shape. Attention should be paid to frequently washing the surface of the orchid pots with water and spraying the front and back of orchid leaves to ensure that the stomata are unobstructed.

4. Ventilation of pots and potting soil

1. Orchid pots should preferably be tall, high-footed, thin-walled, highly breathable clay pots, and orchid pots with many holes in the pot walls and bottom can also be selected.

2. The growing medium or potting soil should preferably adopt a layered method. If potting soil is used, 2 to 3 small bricks can be used to cover the bottom hole of the pot, spread with 3 cm thick block charcoal, then fill in a mixed soil of decomposed humus soil and river sand up to 1/2 of the pot height, add a 3 cm thick layer of burned cinder, and cover with mixed soil again up to the pot rim, so that the orchid pot has an environment where gas can circulate easily.

3. The number of plants planted per pot should not be too many. If there are many plants and the leaf clusters are dense, they should be repotted and divided in time, and weeds, diseased leaves and dead leaves in the orchid pot should be frequently removed to facilitate ventilation.