The function and application of potassium dihydrogen phosphate in orchid cultivation

Potassium dihydrogen phosphate is a kind of quick-acting phosphorus and potassium binary compound fertilizer, which is also an important growth regulator. It has been widely used in the cultivation of orchids. In order to apply potassium dihydrogen phosphate correctly and reasonably, the following points should be paid attention to:

1. The main role of potassium dihydrogen phosphate

1. Chlorine-free, low salt index, soluble in water. Rich in phosphorus and potassium nutrients, safe and nontoxic.

2. It can buffer the change of soil pH and stabilize the pH value of soil. It can promote the growth and reproduction of rhizosphere microbial flora of flowers. Can improve soil, so that flowers developed roots, leaves thick green, stem stout, disease resistance, stress resistance enhanced.

3, for foliar spraying absorption utilization rate as high as 80%-90%, can regulate flower growth, supplement nutrition at critical moments.

4, the dosage is small, the effect is obvious. Potassium ions and phosphate ions in potassium dihydrogen phosphate can be directly absorbed and utilized by flowers and plants, and the effect is fast and obvious.

II. Determine the correct application method

At present, it is mostly used for extra-root fertilization. The general concentration is 0.05% to 0.1% in seedling stage and 0.2% to 0.3% in middle and late stage. In the growth period, 0.2%-0.3% potassium dihydrogen phosphate solution is often sprayed on the leaves, which can make the branches strong and luxuriant, and the flowers colorful. Spraying 0.3% potassium dihydrogen phosphate solution for 2 to 3 times at budding stage can make its flowers large and colorful.

In the flower bud differentiation period with potassium dihydrogen phosphate, foliar spray can promote flower bud differentiation, so that more flowers, common use concentration of 0.1%-0.2%, is to weigh 1-2 grams of potassium dihydrogen phosphate and then add water to 1 kg (about 1 liter), in the morning or evening with a small sprayer on the foliage spray can be.

As for the best spraying position, the absorption of potassium dihydrogen phosphate was stronger in young leaves than in old leaves, and stronger on the back of leaves than on the front. In addition, young shoots could absorb potassium dihydrogen phosphate.