Will fresh sawdust potted orchids burn roots?

The grass growing down the mountain, the mature orchid with serious rotten roots, the weak single root of the seedling and the old Mingpin bulb cut off by individual plants are the most suitable for pot cultivation with pure sawdust. Magnolia, Tiger head Orchid, Duozhanchun, Paphiopedilum and other orchids which require good air permeability in potted soil have a good cultivation effect.

The practical effect of planting orchid with pure sawdust in local orchid friends is that the growth is very prosperous in the first year, especially Langen Zhuang, with a large number of roots and a high budding rate. In the second year, the growth potential was poor, and some even appeared the phenomenon of leaf tip black blight. After turning the basin observation, Langen is still good, only sawdust decomposition thirst, deposition caking, almost no nutrients. The sawdust layer is so loose that it has lost the water holding, drainage and aeration properties of the fresh sawdust layer. This is bound to affect the respiration and absorption of roots, resulting in poor growth of orchid plants.

The orchid plant of the national orchid in a fresh sawdust basin for about 12 months, the orchid leaves on the ground are green and bright, and the underground part

The root was strong, yellow and white, and there was no damage to the root tip. According to the analysis, the process of decomposition and "fermentation" of pure sawdust in the basin is very slow. Even if it produces some "fat and heat", it will take away a lot of heat and fertility because the sawdust is breathable and often watered, which is only a small part absorbed by Langen, so there will be no "root burning" phenomenon. Looking at the problem of nutrient supply of sawdust orchid, from the performance of thinner and lighter leaves in potted one year, the nutrient of orchid is lower than that of pure orchid mud, so it is necessary to apply grain fertilizer to supplement nutrients during the growth of sawdust layer.

Net sawdust planting orchid for a year or so, if the decomposition and settlement is serious, it is not necessary to turn the basin, just press the sawdust layer under your fingers to add sawdust or orchid particles to the gap, so that the roots and bulbs touch the plant closely, tidy up the basin surface and continue to maintain as usual. (Zhang Zhengguo)