Orchids should be fertilized according to their development period.

With different growth periods of orchids, the demand for fertilizer is different. Practice has proved that good fertilizer effect can be achieved and side effects can be prevented only by applying fertilizer according to the development period. Dormant winter is the dormant period of orchid growth, at this time, it is generally not suitable to fertilize, but if applied, it destroys the necessary dormancy of orchids and induces late winter and early spring buds, and these early buds are determined because they cannot withstand low temperature and freezing injury. seriously reduced the germination rate of the following spring. In order to improve the stress resistance of the plant, potassium dihydrogen phosphate and multi-element micro-fertilizer with 600 to 800 times liquid could be sprayed on leaves in the evening, once a week for 2 to 3 times in a row. In the budding period, as the temperature rises in spring, the orchid awakens from dormancy and begins to sprout. At this time, sprouting fertilizer should be applied, and 2% potassium sulfate compound fertilizer solution is often used to water the root. If you want to mix cooked bone meal and rotten oil residue cake fertilizer, the concentration of potassium sulfate compound fertilizer should be reduced to 1%, once every 15 days. At the same time, external fertilization is applied once a week, with 1% potassium dihydrogen phosphate solution, which can be mixed with growth regulators such as "Shibao" and "phytoprotegerin". During the growing period, more nitrogen is needed in this period, and the type of fertilizer is the same as the budding stage. in order to increase the proportion of nitrogen, 3% to 6% mature human feces and urine can be added to irrigate the root, and the fertilization time can be shortened to 10 days. At the same time, potassium dihydrogen phosphate and multi-element micro-fertilizer were selected for extra-root topdressing. Flower bud differentiation period when the leaves of the new shoots no longer elongate, they enter the flower bud differentiation stage. More phosphorus and boron elements are needed in this period. The roots are often irrigated with 3% cooked bone powder or rotten human feces and urine with 0.4% boron solution, once every 10 days, for a total of 2 times. At the same time, extra-root topdressing was carried out as in the growing period. Flowering plants consume a lot of nutrients at the end of flowering stage. in order to ensure safe overwintering and not affect the germination rate in spring, "moon fertilizer" should be applied twice to fully supply a large number of elements and trace elements. Commonly used potassium sulfate compound fertilizer 2% solution watering roots, 500 times multi-element micro-fertilizer or 600 times potassium dihydrogen phosphate solution spraying leaves.