Key points for attention of foliar fertilization of orchids

(1) spraying should be targeted. That is, Yilan plant in each growth period of the nutrients needed to choose the corresponding fertilizer, targeted supply. For example, the new bud growth period should be based on nitrogen fertilizer, and potash fertilizer should be added at the same time to play a role; potash fertilizer should be added when the new seedlings are mature to ensure the healthy growth of the plant; phosphate fertilizer should be added during the blooming period; in addition, Magnolia should be sprayed less nitrogen fertilizer to prevent excessive nitrogen fertilizer, chlorophyll increase and line art degradation. (2) the mixed use should be scientific. Although the fertilizer content of commercial foliar fertilizer is more complete, do not always use the same variety, use different varieties of fertilizer mixed and used alternately, learn from each other and make the nutrition more comprehensive. For example, the use of urea as foliar fertilizer must be mixed with potassium dihydrogen phosphate, otherwise it is easy to grow crazy. Generally speaking, it is also necessary to master that acid and base do not mix, and biological fertilizer does not mix with other fertilizers. (3) the concentration ratio should be appropriate. Use the concentration in strict accordance with the relevant instructions, it is strictly forbidden to increase the concentration at will, otherwise it will be counterproductive, produce fertilizer damage, and even inhibit the growth of orchids. In general, liquid fertilizer is quantified with a syringe and solid fertilizer is weighed by a balance. (4) the spraying time should be reasonable. Foliar fertilization should not be carried out in the morning, generally, the sun can not reach the leaves in the evening on a sunny day, and it is better to dry within an hour after spraying, on the one hand, it is beneficial for orchid leaves to absorb nutrients at night, on the other hand, to avoid fertilizer damage and reducing effect caused by light, especially to prevent leaf heart effusion from causing rotten buds. In addition, the interval is not too short, it is better to take once every ten days or so, so as not to produce over-nutrition. (5) the method of spraying should be paid attention to. Because the fertilizer is absorbed into the body through the leaf stomata, the leaf stomata are mainly on the back of the leaf, so the foliar fertilizer is mainly sprayed on the back of the leaf, the spray head should be upward, the fog point should be fine, and there are more opportunities for spraying on the back of the leaf. At the same time, the amount of spraying should not be too large, it is better to keep the leaves from dripping water, so as to prevent the fertilizer liquid from accumulating the leaf tip and causing fertilizer damage to the burning tip. (6) spray less during dormancy. During the period of low temperature dormancy, the physiological activity of orchid plant weakens and generally does not absorb fertilizer. However, potassium dihydrogen phosphate which can improve cold resistance and biological fertilizer that can be easily absorbed can be sprayed once every half a month. At the same time, spraying a little foliar fertilizer on rootless and weak orchid plants can maintain their life and improve the survival rate. (7) careful spraying of growth hormone. It is true that growth hormone can promote plant growth and development, improve germination rate, promote early maturity and increase yield, but its main function is to promote cell elongation, which will grow or even lodge after application, which has an obvious effect on the health of orchid plants. It's better not to use it. (8) Ye Shi depends on the weather. In rainy days, the air humidity is high, the water is difficult to evaporate, and the fertilizer liquid stays on the leaf surface for a long time, which is easy to cause fertilizer damage. In high temperature weather, especially when the temperature is higher than 30 degrees, water evaporation is too fast, which will make the concentration of foliar fertilizer increase rapidly, resulting in fertilizer damage, so it is not suitable to spray. (9) wash leaves after spraying. Spray water once in the morning after fertilization in the evening to wash away the residual fertilizer from the orchid leaves so as to avoid fertilizer damage caused by sunlight. There are two ways to wash leaves: one is to spray orchid leaves directly with clear water; the other is to add fungicides to the water and spray them with a sprayer. (10) foliar fertilization can not replace root fertilization. Foliar fertilization is an auxiliary means of fertilization, is to make up for the lack of root absorption, can not completely replace root application, otherwise it will cause root atrophy and poor growth.