Matters needing attention in foliar fertilization of Orchid

In the previous article, the editor told you about the advantages of orchid foliar fertilization, so what are the precautions of orchid foliar fertilization?

First, insoluble fertilizer can not be used in orchid foliar fertilization. The rate of foliar absorption of different fertilizers with the same nutrient elements is different. With the same potassium fertilizer, the fastest foliar absorption rate is potassium chloride, followed by potassium nitrate, followed by potassium dihydrogen phosphate; the same nitrogen fertilizer, the fastest foliar absorption rate is urea, followed by nitrate nitrogen fertilizer, followed by ammonium nitrogen fertilizer. The fertilizer used for foliar spraying can only be water-soluble, and the insoluble fertilizer can not be used.

Second, we should pay attention to the solution concentration and reaction. The principle is that under the premise that the leaf surface is not damaged by fertilizer, properly increase the solution concentration, which can improve the osmotic efficiency, and the effect is better, but we must pay attention to the appropriate.

Third, pay attention to the time when liquid fertilizer stays on orchid leaves. Generally requires the fertilizer solution to wet the orchid leaves in 30 minutes to 1 hour, so that the absorption is fast and the effect is good. If it is killed soon, the effect will be very poor. The effect of rain soon after spraying is not good, so you should choose sunny evening or dewy early morning for foliar spraying, and the windless weather is better.

Fourth, it is necessary to reasonably choose the location of spraying foliar fertilizer. Stomata are the entry and exit of gas and water in and out of plants during photosynthesis and respiration, so foliar spraying should be reasonable. For example, the stomata of Cymbidium leaves account for about 85% on the back and only 15% on the front, so special attention should be paid to the back of spraying leaves when fertilizing. The same is true of other varieties of national orchids, with emphasis on spraying the back of the leaves.

Fifth, we should pay attention to the cleanliness of water quality. The water quality used to dilute fertilizers should be clean and turbid water containing impurities should not be used. If tap water is used, it must be stored for more than one day until the chlorine is released.

Sixth, do not apply a single fertilizer for a long time. Orchids should be sprayed with different fertilizers in different growth periods, and only single fertilizers should not be used for a long time. For example, when new buds of orchids are unearthed in spring, they should be mainly nitrogen fertilizer, such as urea, Huabao (No. 5), etc.; from the beginning of July to the end of August, in order to promote the formation of flower buds, mainly phosphate fertilizer, such as Huabao (3), potassium dihydrogen phosphate and so on.