Potassium dihydrogen phosphate is a high-efficiency compound fertilizer of phosphorus and potassium. It promotes photosynthesis of crops, quickly replenishes effective nutrients in the soil, improves soil fertility, is easily absorbed and utilized by crops, enhances crops’ resistance to cold, drought, diseases and insect pests, and improves crop quality. Function. It has the characteristics of low dosage, high fertilizer efficiency, easy absorption, quick effect, convenient use, and significant yield increase effect. Potassium dihydrogen phosphate is a non-toxic, harmless and residue-free green fertilizer. It has been widely used in fruit production in recent years.
The nutritional content of high-purity potassium dihydrogen phosphate is 52% phosphorus and 34% potassium. Phosphorus has a significant effect on the growth of crop roots, stems and peels, and also has a significant effect in enhancing crop disease resistance, cold resistance and waterlogging resistance. Potassium has significant effects in increasing crop yield, increasing fruit quality and increasing sugar content.
In agricultural production, the use of potassium dihydrogen phosphate has always attracted much attention. It is a high-efficiency and high-quality phosphorus-potassium fertilizer. Due to its rapid absorption and utilization, a utilization rate of more than 90% and good effects, it has become a “universal fertilizer” in the fertilizer industry. . Understanding its functional properties and using it skillfully and correctly can achieve twice the result with half the effort. Let me share with you the efficacy and usage period of dihydrogen phosphate.
The efficacy of potassium dihydrogen phosphate
1. Prevent late spring cold: Extreme weather has occurred more and more frequently in recent years. Late spring cold in April and May every year has a great impact on the flowering and fruit setting of many fruit trees. At present, the level and accuracy of weather forecasts in our country are very high, which lays the foundation for preventing late spring cold.
Three to five days before the late spring cold, spraying 500 times of potassium dihydrogen phosphate solution + 1000 times of sprucein lactone solution on the leaves can significantly improve the cold resistance of fruit trees and effectively reduce flower and fruit drop caused by late spring cold. Continuous spraying of potassium dihydrogen phosphate two to three times during the crop growth period also has a certain preventive effect on gray mold and downy mildew.
2. Promote rooting, germination and fruit enlargement. Phosphorus has the function of rooting, promoting flower bud differentiation, and providing energy for fruit expansion. Potassium can slow down aging in the later stages of growth, increase photosynthesis, promote nitrogen absorption, make crops mature earlier, increase fruit sugar and moisture, and enhance disease and drought resistance. Thus, the yield, quality and commerciality of fruits can be improved as a whole.
Usage Period of Potassium Dihydrogen Phosphate
Generally speaking, potassium dihydrogen phosphate is better used during the flowering stage, fruit expansion stage, color change stage, and flower bud differentiation stage. The spraying concentration is 500-800. It is generally not recommended to use it at noon and when the temperature is high.
1. Before and after flowering:
At this time, the demand for phosphorus is relatively large, and phosphorus is also very effective in improving crop flowering and fruit setting rates and reducing flower and fruit drop. Spraying 500-800 times potassium dihydrogen phosphate on the leaves can make the leaves thicker, increase photosynthesis efficiency, and increase the fruit setting rate of fruit trees.
2. Fruit growth period:
Everyone knows that the fruit expansion period is when the demand for potassium is greatest. Potassium is irreplaceable for seed formation and fruit expansion, and crops are most sensitive to potassium at this time. The effect of root application or foliar spraying is most obvious during this period.
Spraying 500-800 times potassium dihydrogen phosphate 1-2 times can promote the enlargement of young fruits and increase the growth rate of young fruits. Now is the best time to use potassium dihydrogen phosphate!
3. Veraison period:
Fruit coloring is the process of anthocyanin formation, and the formation of anthocyanins is directly related to sugar content and sunlight. The formation of sugar substances is greatly affected by potassium. Therefore, the action process of potassium plays a very critical role in the coloring of fruits. Spray potassium dihydrogen phosphate on the foliage 500-800 times to promote sweetening and good color change of the fruit.
4. After picking:
Sprayed potassium dihydrogen phosphate can protect leaves, reserve energy for next year’s flowering and fruiting, and promote flower bud differentiation.
Attached: How to use common crops
Potassium dihydrogen phosphate can be used in various ways, including spraying, flushing and root irrigation, root dipping and transplanting, seed soaking and dressing, and basal application. The appropriate periods of use for different crops are also different.
Citrus, apple, peach, pear and other fruit trees
When applying base fertilizer in autumn, apply potassium dihydrogen phosphate evenly and water once after covering. The dosage can be based on the age of the tree, 30-60 grams per tree.
Spray potassium dihydrogen phosphate once at the first flowering and young fruit stages respectively at a dosage of 100 grams per acre mixed with 50 kilograms of water.
Spray 2-4 times during the expansion period, using 100 grams of potassium dihydrogen phosphate per acre mixed with 50 kilograms of water each time. Spraying 0.2% potassium dihydrogen phosphate during the fruit expansion stage can promote fruit coloring and sweetness.
Spray once 7 days before harvest, use 100 grams per acre and mix with 50 kilograms of water. The fruits are characterized by high sugar content, bright color and good taste.
Grapes
Spray potassium dihydrogen phosphate during the growth period of new shoots, before flowering, flowering period, and fruit expansion period after flowering. The dosage is 80-100 grams mixed with 50 kilograms of water. Spraying 1-2 times a month before harvest can increase the sugar content of grape fruits. The grapes will be large and spotless, with fresh color, good taste and longer storage time.
Strawberry
Applying 0.2% potassium dihydrogen phosphate to the leaves 3-4 times before and after the flowering period can promote flower bud differentiation, increase fruit setting rate, produce more flowers and fruits, improve fruit quality, and increase single fruit weight. Before the cold wave comes, foliar spraying of potassium dihydrogen phosphate can helpResistance to cold and frost.
Watermelon
Spray potassium dihydrogen phosphate once during the seedling stage at a dosage of 50-80 grams per mu mixed with 50 kilograms of water. Spray once every 7 days during the vine-drawing stage, after flowering and setting of the melons, and then add 50 kilograms of water per mu. This will not only increase yield but also increase sweetness.
Cherry
During the late fruit setting period of cherries, attention should be paid to the application of phosphorus, potassium and calcium fertilizers, and 0.2% potassium dihydrogen phosphate can be sprayed on the leaves 3-4 times.
Banana
From when the banana leaves spread to buds and blooms, apply a 0.6% potassium dihydrogen phosphate solution every 15-20 days. In order to improve the nutritional level, 0.2% potassium dihydrogen phosphate can also be sprayed on the leaves every 10-15 days.
Pineapple
Before the winter cold wave comes, apply 0.6% potassium dihydrogen phosphate solution once to the roots to increase the phosphorus and potassium levels of the plants and enhance their ability to withstand cold and overwinter. Spray 0.2% potassium dihydrogen phosphate aqueous solution 2-3 times on the leaves, spray once every 7-10 days, and spray all the leaves evenly until water droplets begin to flow along the leaves to the leaf axils and drip to the roots, which can significantly enhance the Cold resistance.
Flowers
When transplanting flowers and trees, dip the roots in about 0.8% potassium dihydrogen phosphate solution and then transplant them.
Woody flowers such as jasmine, gardenia, rhododendron, etc. are often sprayed with 0.2% potassium dihydrogen phosphate solution on their leaves during the growth period to make their branches strong, leaves luxuriant and flowers colorful.
For herbaceous flowers such as a bunch of reds, petunias, dahlias, etc., spray 0.2% potassium dihydrogen phosphate solution 2-3 times during the budding stage to make their flowers larger, more numerous, and brighter in color.
Carrots, white radish
After planting, spray potassium dihydrogen phosphate twice per acre with 50-80 grams and 50 kilograms of water.
Entering the expansion period, add 100 grams of water per mu and 50 kilograms of water. It is characterized by strong stems and leaves, roughly uniform fruit, less disease and less cracking.
Garlic
Before winter, 100g of potassium dihydrogen phosphate mixed with 50kg of water can be sprayed on the leaves per acre.
After turning green, 0.2% potassium dihydrogen phosphate solution can be sprayed.
Onions
During the seedling cultivation period, 20g of potassium dihydrogen phosphate can be mixed with 15kg of water for foliar spraying.
After transplanting and before harvesting, 80g of potassium dihydrogen phosphate mixed with 50kg of water can be sprayed on the leaves per acre.
Sweet potatoes, potatoes
Spray potassium dihydrogen phosphate once each during the branch and tuber forming stage, the stem and leaf growth stage, and the expansion stage. Use 100 grams of potassium dihydrogen phosphate per acre and add 50 kilograms of water each time.
Rapeseed
Spray potassium dihydrogen phosphate once in the pre-seedling stage and late seedling stage, and use 20-30 grams of reverse osmosis fungicide per acre mixed with 15 kilograms of water.
Spray potassium dihydrogen phosphate once during the sprouting stage, flowering stage, and mature stage at a rate of 30 grams per acre mixed with 15 kilograms of water.
The symptoms include strong seedlings, full seeds, less disease, and large growth rate.
Tea
During the growth period of tea, 30g of potassium dihydrogen phosphate mixed with 15kg of water can be sprayed on the leaves per acre, which can effectively resist drought, cold, yellow leaves and other diseases, and can greatly increase the yield and quality of tea.
Tobacco
After topping the tobacco, spray potassium dihydrogen phosphate with a concentration of 1000 times, and spray again 5 days later with 10-1 silane.
Wheat
In the early stages of greening, early jointing, early booting, early flowering, and early grain filling, apply 100 grams per acre, mix with 50 kilograms of water and dissolve before spraying.
During the heading and flowering stage, 20 grams of potassium dihydrogen phosphate per acre can be mixed with 15 kilograms of water for top dressing.
Spraying potassium dihydrogen phosphate before the cold wave of winter wheat can resist cold and frost; spraying potassium dihydrogen phosphate solution in the later stages of growth can not only supplement phosphorus and potassium nutrients, but also have a certain effect against dry and hot winds.
Rice
Spray potassium dihydrogen phosphate once at the tillering stage, jointing stage, and booting stage at a dosage of 100 grams per mu and 50 kilograms of water each time. This can extend the life of rice flag leaves, promote the transportation of photosynthetic products to seeds, and further increase grain weight. , achieve high yield. Multiple spraying during the grain filling period can enhance the stress and damage resistance of rice and significantly reduce the occurrence of diseases.
Corn
After the seedlings are established, spray potassium dihydrogen phosphate once at each jointing stage. The dosage per mu is 100 grams mixed with 50 kilograms of water.
Spraying 0.2% potassium dihydrogen phosphate solution on the leaves after flowering can protect roots and leaves, and improve the fruit setting rate and fruit filling rate. It is characterized by less lodging, less disease, large ears, full tops and full grains, and can generally increase yield by more than 35%.
Peanuts
Before the flowering period, spray potassium dihydrogen phosphate twice during the flowering and pod-setting stages. The dosage is 100 grams per mu per time, mixed with 50 kilograms of water per mu.
Potassium dihydrogen phosphate can also be applied in combination with watering during the flowering and pod-setting stages, and about 120 grams per acre can be used. The symptoms include less disease, strong seedlings, early fruiting, many and plump fruits, and the growth rate can reach more than 40%.
Soybeans
Spray potassium dihydrogen phosphate once at the seedling stage, early flowering stage, and full flowering stage. The dosage is 100 grams per mu, mixed with 50 kilograms of water.
Cotton
Spray once in the seedling stage, budding stage, and flowering stage, 100 grams per acre mixed with 50 kilograms of water. Spray once every 10 days from the flowering and boll stage to the top. It is rod-shaped, bears early fruit, is thick and large, resists premature aging, has long cotton fibers and has good toughness. From mid-August to early September, 0.6% potassium dihydrogen phosphate can be used for top dressing outside the roots to promote cotton bolls to crack and spit out fluff as early as possible.
Cucumbers, tomatoes, beans, eggplants and other vegetables
Spray potassium dihydrogen phosphate twice from planting to early flowering, with a dosage of 20-30 grams per mu and 15 kilograms of water.
Spray once every 7 days after fruit setting, using 20 grams per acre mixed with 15 kilograms of water.
It has green leaves, fresh color, and few diseases, and can reach the standard of pollution-free vegetables.
Cucumber: During the peak fruiting period, 0.2-0.3% potassium dihydrogen phosphate aqueous solution can be sprayed on the leaves.
Tomato: 0.2-0.3% diphosphate can be used when phosphorus deficiency causes small leaves, late fruiting, rolled leaves in the later stages of the plant, irregular fruit shape, uneven maturity, and uneven color caused by potassium deficiency, and the plant is susceptible to gray mold. Spray potassium hydrogen solution for remediation.
��A 0.2-0.3% aqueous solution of potassium dihydrogen phosphate can be used for foliar spraying.
Tomato: 0.2-0.3% diphosphate can be used when phosphorus deficiency causes small leaves, late fruiting, rolled leaves in the later stages of the plant, irregular fruit shape, uneven maturity, and uneven color caused by potassium deficiency, and the plant is susceptible to gray mold. Spray potassium hydrogen solution for remediation.
