< b > diagnosis and correction of orchid nutritional deficiency < / b >

Orchids lack some nutrients, which will be shown in their plants. According to this manifestation, nutritional deficiency can be diagnosed and corresponding measures can be taken to correct it.

① is deficient in nitrogen. The new leaves are shorter, narrower and thinner than the old ones, with yellowish color and lack of luster. The roots can be irrigated with 500 times of potassium sulfate compound fertilizer or potassium nitrate compound fertilizer, and the foliar back can be sprayed with 0.2% urea solution in the evening. Once every three or five days and sprayed three times in a row, it can be corrected.

② is deficient in phosphorus. It shows that the leaf bud grows slowly, does not root for a long time, and the leaf margin rolls slightly. You can use 2% calcium superphosphate leaching solution, or 3% 5% bone powder solution, or 800x liquid potassium dihydrogen phosphate to water the root, once every 10 days, twice continuously; and with 600x liquid potassium dihydrogen phosphate, or 1000 times liquid Huabao No. 3, spray the back of the foliar leaves in the evening, once every three to five days, it can be corrected.

③ is magnesium deficient. The leaf tip and edge of the middle-aged leaf are yellow and curly to the leaf surface (commonly known as the edge of copper gong). 0.5% magnesium sulfate solution can be used to spray leaves in the evening, once every three or five days, three or five times in a row, it can be corrected.

④ is deficient in potassium. It shows that the leaf edge and tip are yellowing (the old leaf is then the new leaf), and then the main lateral vein of the leaf is thinner; the leaf is soft and easy to bend; in case of strong light and low temperature, the new leaf appears micro-dehydration. 0.5% potassium sulfate solution can be used to irrigate roots and spray leaves, or plant ash can be removed.

⑤ is deficient in manganese. Although there is proper shade, there are sunburn-like markings and undeveloped buds in the spots; the leaves are withered, green, and less glossy. Neutral, calcareous and sandy soil are prone to manganese deficiency. Spraying the leaves with 0.3% manganese sulfate solution for 3 times can be corrected.

⑥ is deficient in calcium. It shows that the leaf tip is hooked (except those with variety characteristics). Common in plants with acidic fertilizers. The root can be irrigated once with 1.0% lime solution, or 3% solution of livestock calcium powder can be used for correction.

⑦ is iron deficient. The mesophyll of the young leaves turned yellow to white, and the veins, margins and tips of the middle leaves showed scorched brown spot necrosis. 0.5% ferrous sulfate solution can be sprayed on the leaves, once every 3 days, two or three times in a row, it can be corrected.

⑧ is zinc deficient. The results showed that the middle part of the bottom leaf showed pure rust-like spots, and gradually expanded to both ends of the leaf, and the petiole ring of the new plant was obviously lower than that of the old leaf. The leaves can be sprayed with 0.1% zinc sulfate solution, once every three to five days, three times in a row, and it can be corrected.

⑨ is deficient in copper. The leaf tip showed chlorosis, gradually turned to grayish white, and expanded to the whole leaf, and the growth stagnated. It can be sprayed with 0.2% copper sulfate solution, once every 7 days, twice in a row, and it can be corrected.

⑩ is boron deficient. The results showed that the base of young leaves was injured, the petiole ring was brittle and easy to break, the number of flowers decreased obviously, the buds opened slowly, and the flower endurance period was obviously shortened after flowering. Can be sprayed with 0.3% borax or boric acid solution, once a week, three times in a row, can be corrected.

⑩ is lack of molybdenum. The results showed that in the case of no application of dwarftin, the new plants would be obviously dwarfed, and the old leaves would lose chlorosis, resulting in withering, wilting and necrosis. Can be sprayed with 0.1% ammonium molybdate solution, once every 3 days, 3 times in a row, can be corrected.

If we can supplement fertilizer according to the lack of fertilizer in the orchid plant and make the nutrient elements of the dwarf relatively balanced, the function of each organ of the plant can be brought into full play and coordinated, which will play a good role in improving the yield and quality.