The consequence of poor gas exchange rate in the medium of orchid basin

Whether the oxygen content in the medium is moderate or not has a positive correlation between the growth of orchid root and the normal development of stems and leaves.

When the content of oxygen in the medium is insufficient, the content of carbon dioxide will increase greatly, and the ability of root respiration, water absorption, nutrient transport and so on will also be limited. The pores of the medium are occupied by a large amount of water, fresh oxygen can not enter the pores, oxygen is consumed by a large amount of oxygen due to the oxidation of microorganisms and chemical reactions, the root growth will be seriously hindered. And because of the lack of oxygen, organic matter and inorganic matter can not be oxidized completely, and produce toxic substances, such as organic acid, hydrogen sulfide and so on, which poison the root system and make it lose its normal physiological function.

When the oxygen diffusivity in the orchid basin is poor, the life of beneficial microorganisms, such as orchid bacteria, nitrifying bacteria, mycorrhizal fungi, phosphorus-solubilizing bacteria, fiber-decomposing bacteria, etc., is also limited, and their intermediates can not be decomposed and released for root absorption and use. In order to stimulate the root system to continue to grow, parallel to its due function, affecting the flow and storage capacity of water and nutrients in the national orchid plant. Reducing the need for root cells to absorb the necessary nutrients and water, the growth of orchid plants showed withering and dwarfing.

In general, whether the ventilation of the medium is good or not has a causal relationship with the particle size and water management of the medium. The larger the particle size of the medium material is, the better the ventilation is, the better the ventilation is, which contributes to the diffusion of oxygen and makes the root system get more oxygen. However, the moisture of the medium material with large particles is not easy to maintain, and the water loss is faster at high temperature in summer. It is easy to cause growth stagnation due to lack of water. The particle stability of the medium material will also affect the ventilation, such as the inorganic medium sphene, whose particle stability is low, easy to disintegrate into fine particles, occupy the pores in the medium, make the ventilation worse, resulting in anoxic decay and poor growth and development of the root system.