The cultivation medium contains pollutants and biological differences.

Generally speaking, the cultivation media used by domestic orchid friends are nothing more than Japanese stone, perlite, silica, foamed stone, Shilin stone, tiles, bricks, stones, polylone, synthetic gas, artificial, snake sawdust, peat moss, bark, water moss, and other agricultural products wastes and other inorganic or organic materials as the cultivation medium. how to select and provide a good cultivation medium environment is the most important topic for the cultivation of national orchid.

However, at present, the medium materials used in national orchid cultivation are generally chemical synthesis or taken from nature, the medium materials themselves often contain pollutants, female. There are some problems, such as bacteria, eggs, pigments, heavy metal pollution, pesticide residues, toxic substances and so on. National orchid growers often lead to root rot if they use it rashly without prior measures before planting.

Generally, the PH value of peat moss is less than 4, and some of them will carry bacteria and nematodes. When planting Chinese orchid, if there is no prior disinfection, adding lime or using lime to adjust M value, the root growth is easy to be restricted. Bark contains some resin, tannic acid and phenolic compounds, if they are fully accumulated and mature and fermented completely before planting, these toxic substances will inhibit lateral bud germination and root growth, and poison the root system. resulting in short and thick roots, a small number of roots, less root hair, slow growth; when used for a large number, it will cause sharp browning or blackening and decay.

The important biological properties of the medium include the presence or absence of beneficial and harmful microorganisms. There is a certain proportion of microbial content in the medium, and there will be room for mutual antagonism and competition among microbial species. When the beneficial microbial biomass is long, it can secrete growth hormones, which can promote the growth and development of root system and the growth of stems and leaves, and inhibit the growth of pathogens; when the harmful microbial biomass is long, the transmission of pathogenic bacteria such as Phytophthora and Rhizoctonia solani will form dominant bacteria, resulting in serious diseases of roots and stems and leaves.

Therefore, the healthy and strong national orchid of Yougong must have good media, cooperate with the good management environment and methods of cultivation managers, in order to cultivate better results. Chinese orchid grows in a limited medium in a small pot for a long time, and its growth is easily restricted without good biological microorganisms.

General orchid friends mentioned that the current media for the cultivation of national orchids, if they are treated with high temperature before planting, is it appropriate to kill the diseases and insect pests that hinder the growth of national orchids? At present, if the plant materials used in the cultivation of national orchid are treated by high temperature disinfection, both beneficial and harmful microorganisms will be greatly reduced. National orchid growers need to add beneficial microorganisms in advance to control the reproduction of harmful microorganisms. If we do not take this advance measure in advance, and the plant itself has transmitted bacteria, and there are no microorganisms in the medium, we will not be able to antagonize the reproduction of spreading bacteria. The competitive living space of harmful pathogens can not be suppressed, and when it reaches a certain damage index, it will be quickly damaged in a short time, resulting in serious ulceration of roots and stems and leaves.

Whether the ventilation, water retention capacity, pH value, cation exchange capacity, buffer capacity and biological ability of the cultivation medium are good or not will affect the absorption and transport of water and nutrients by the root system and the photosynthetic storage capacity of stems and leaves. The cultivation medium suitable for the root growth of Orchid was selected, and then properly prepared, stacked and fermented, fully ripened, reduced the content of toxic substances, increased buffer capacity of the medium and beneficial microbial population. Reduce the occurrence of harmful pathogens, so that there is a good environment for root development and an ideal national orchid can be cultivated.