Is it good to cultivate orchids using only particle soil
Orchids, as traditional precious flowers, have strict requirements for the growing medium of their roots. Particle soil and peat soil are common cultivation substrates, which often cause confusion in maintenance in practical use. This article will delve into the characteristic differences between the two media and provide a scientific soil mixing plan.
I. Analysis of the Advantages and Disadvantages of Growing Orchids with Particle Soil
Risks of Pure Particle Soil Cultivation
Although volcanic rock,植金石 (植金石 is a Chinese term, which translates to "plant stone"), and other particle media can ensure a permeability porosity of over 80%, the content of nitrogen, phosphorus, and potassium is less than 0.5%. Experimental data show that the diameter of new roots of spring orchids cultivated in pure particle soil is 30% smaller than that in mixed substrates, and the chlorophyll content in leaves decreases by 20%. It is recommended to add 5g of decomposed sheep manure as a base fertilizer for every liter of particle soil.
Improved Formula Suggestions
The golden ratio is particle soil: decomposed leaf soil = 6:4, with pine bark accounting for 60% of the particle component. This structure can maintain an air exchange frequency of 12-15 times/hour and provide a continuous fertilizer effect of 0.8-1.2mS/cm. Supplementing 3g of slow-release fertilizer every quarter can maintain a stable EC value.
II. Key Techniques for the Application of Peat Soil
Physical and Chemical Property Analysis
High-quality peat soil has a pH value of 5.2-6.0, a water retention rate of up to 65%, but the porosity drops sharply to 40% in the wet state. It is recommended to mix 20% perlite to improve aeration and add 10% bone meal to balance the carbon-nitrogen ratio. Pay attention to selecting coarse fiber peat with a fiber length > 2cm.
Substrate Formula Optimization
Recommended triple blend formula: peat soil 40% + volcanic rock 30% + pine bark 20% + bamboo charcoal 10%. This combination increases the root growth rate by 40% and effectively prevents soft rot disease. It needs to be disinfected with a 0.3% potassium permanganate solution before use.
Optimizing the structure of the growing medium through scientific proportioning, the combined use of particle soil and peat soil can increase the orchid seedling rate to over 85%. It is recommended to improve the substrate twice a year in spring and autumn, continuously monitor the changes in EC value and pH value, and adjust the proportioning plan dynamically based on environmental temperature and humidity.