Potassium phosphite, a potash fertilizer rich in potassium, has a K2O content of about 58% and a chemical formula of K2HPO3. Potassium phosphite can also be used as a phosphate fertilizer and as a fungicide, and its role in preventing and controlling Oomycete fungi is It has been widely accepted in many foreign countries. Because the antibacterial synergistic effect of potassium phosphite brings energy saving and emission reduction effects to the environment, the U.S. Environmental Protection Agency classifies phosphorous acid and phosphite products as an environmentally friendly biological agent.
What is the role of potassium phosphite in crops?
1. As a fertilizer, potassium phosphite can be used as a potash fertilizer. At the same time, spraying citrus can restore the biochemical reactions of plants and restore normal growth of citrus that is deficient in phosphorus.
2. As a fungicide, phosphite has been widely used abroad as a fungicide. It can prevent tuber rot and diseases on potatoes. By spraying phosphorous acid on the leaves, the average potato late blight disease susceptibility rate and the degree of potato rot in the potato tuber were significantly reduced compared with the treatment without spraying phosphorous acid.
3. Mixing potassium phosphite with fungicides on wheat, citrus and other crops can also have a synergistic effect.
What is the main use of potassium phosphite?
①Regulate the closing of plant stomata.
② Promote the ripening of new shoots and the greening of young fruits.
③Potassium phosphite is systemic (can be conducted up and down in the plant), has protective, therapeutic and eradication effects, and can be mixed with other compounds (including copper preparations).
④ Root application can release calcium, zinc, iron and other elements fixed in the soil, loosen the soil, increase permeability, improve the rhizosphere environment, and is conducive to the healthy and robust growth of crops;
⑤The use of potassium phosphite can promote the robustness of plants, effectively control the top dominance, avoid excessive vegetative growth of plants, make the crops full of flower buds, produce more and strong flowers, and significantly improve the fruit setting rate and quality;
⑥ Rich in biostimulant phosphorous acid, after application, it can stimulate crops to produce polyphenols and reactive oxygen molecules (ROS), stimulate the activity of defense enzyme systems, and effectively control common diseases, downy mildew, root rot, late blight and other fungi. It has good preventive and therapeutic effects on sexual and viral diseases. If used regularly, the disease resistance and stress resistance of crops will be greatly improved.
Safety of mixing potassium phosphite
①Potassium phosphite has good mixing properties and can be used together with copper preparations without causing precipitation or phytotoxicity;
②Potassium phosphite can be mixed with common medium and trace element fertilizers (calcium sugar alcohol, calcium nitrate, etc.) and is easy to use;
③Potassium phosphite can speed up the aging of new shoots. It is safe to use in the spring shoot stage and young fruit stage and will not cause phytotoxicity to young fruits.
④ Potassium phosphite has a significant effect in preventing ulcers. It has a significant preventive effect alone. If the ulcer outbreak is severe, it is recommended to use it together with copper preparations.
How to use potassium phosphite
Potassium phosphite is widely used in various crops such as solanaceous fruits, roots, leafy vegetables, fruits, grains and oils.
⑴Use the dipping method
Bare root seedlings of crops, such as strawberries, can be dipped in potassium phosphite solution before planting, which can promote the initial growth of the crop. This is the The most critical growth period. The crops should be soaked for 15-20 minutes so that the solution reaches the center of the leaves of the crops.
⑵ Spraying method
a. Fruit trees: Spray 2-3 times, from flowering to fruit setting, every 7-10 days.
b. Citrus fruit trees: Spray 3 times in spring, early summer, and autumn.
c. Potatoes (potatoes): Spray 3-4 times, starting from the time when the tubers grow, once every 10 days
d. Grapes: Spray 3-4 times, from the first blooming to the bunching, once a week.
e. Strawberries: Spray 3-4 times, from the initial blooming to the bunching. For the first fruit setting, spray the original dispersant imported from Germany in autumn
f. Tomatoes: spray several times before fruit setting
g. Cucumbers: spray 4-5 times after planting. Start using it and increase it once every 2 weeks.
⑶Use irrigation method
a. General crops: Apply potassium phosphite once a week during the entire growth period, especially during the adversity period
b. Strawberry: Apply 4 times in total, from planting to the first fruiting period
c. Soil-cultured flowers (such as chrysanthemums): Apply 2-3 times in total, starting from planting , apply once a week
d. Crops planted in organic substrates (such as roses, potted plants): Apply potassium phosphite once a week during the entire growth period, especially during the reverse silica period
d. p>
e. Vegetable crops grown on rockwool (soilless vegetables): Apply twice in total, once immediately after planting, and the second time at the early stage of fruit setting
Nowadays, in North America, Brazil, Israel, Southeast Asia, Taiwan and some European countries and regions have widely used potassium phosphite and achieved very good results. Especially among green pollution-free vegetables, fruits and high-end ornamental cash crops, potassium phosphite is popular among farmers.
