The ventilation problem in the basin of the northern national orchid

The national orchid is the fibrous root system and is very fleshy. The water content of the root is large. According to the measurement on September 6, 2001, the combined water content of the root system of Jian Lan is 85.6%, but its ability to absorb water and fertilizer is weak and requires a high amount of oxygen, so it is called ventilation (gas) as the "first element" of orchid cultivation. If the root system is lack of oxygen (gas) and difficulty in breathing, which hinders the root system's absorption of water and fertilizer, the root system will suffocate to death for a long time; and the accumulation of carbon dioxide in the soil will affect the normal activity of aerobic bacteria, making it difficult to release effective nutrients; it will also make anaerobic bacteria active, accumulate harmful substances such as hydrogen sulfide, directly poison the roots, cause root poisoning and decay, and cause plant death. The failure of raising orchids often lies here. The solution is:

(1) Orchid basin: choose the mud basin with side hole, the drainage hole at the bottom of the basin should be large, if the diameter of the drainage hole at the bottom of the basin is less than 4 cm, it increases small holes around the original drainage hole. The tile that covers the drain hole is replaced with a mineral water bottle. The method is to take the upper part of the bottle, 5ml, 7cm, process it into a hole with fire iron tools, and then apply it. It is better to use a drainage hole cover instead of tiles, thus increasing ventilation.

(2) Plant materials: choose granular plant materials such as volcanic stone, vermiculite, water dregs and charcoal, which are both aerated and water-retaining, and it is better to use phytolith, imperial stone and so on. Its size is 1.5 li 2.5 cm, 1 cm or so, 0.3 li 0.5 cm. Large grains are used in the lower layer of 4mi 7cm, middle grains are used in the middle layer, and small grains are used in the upper layer of 2mi 3cm. The environment where the air is particularly dry is not suitable for application.

A special multi-hole mud basin with a mixture of not yet fully mature cypress leaves 2/3 and volcanic stone and charcoal 1/3. The plant should pay special attention to unobstructed drainage to prevent cypress leaves from getting wet for a long time after absorbing enough water, affecting ventilation, causing hypoxia, rotting roots and even death. In addition, it is rainy in summer, the leaves are completely rotten, the particles become smaller, and the ventilation is weakened, which must be replaced once a year. Compared with the two, the granular plant is more stable.

Jinan balcony orchid, choose a variety of substances such as bark, reproductive soil, sand. The mixture not only moisturizes, but also aerates, and the effect is also good.

Wang Tao of Shandong Academy of Agricultural Sciences