As a phosphorus-potassium compound fertilizer, potassium dihydrogen phosphate has high nutrient content, good physical and chemical stability, and is the chemical fertilizer with the lowest salt index. It is safe for crops and does not burn leaves and roots. It is widely used in various foods. ,Crops. In particular, it is of great significance to spray potassium dihydrogen phosphate to promote early maturity in the north, and the early frost year is more obvious. However, the market for potassium dihydrogen phosphate products is varied, and most people's general understanding of potassium dihydrogen phosphate is in the late foliar application, increasing crop yield and improving quality. In fact, the choice and use of potassium dihydrogen phosphate is not appropriate, it will also reduce the effect. Today, Xiaobian will tell everyone about the purchase of potassium dihydrogen phosphate and the method of promoting early maturity and increasing production.
How to choose potassium dihydrogen phosphate
Must choose more than 86% potassium dihydrogen phosphate
Commonly used in the market are counterfeit potassium dihydrogen phosphate such as potassium sulfate and sodium sulfate. According to the HG2321-92 standard, the difference is that the potassium sulfate and sodium sulfate are white in appearance, and the potassium dihydrogen phosphate crystal is transparent, which can be easily recognized from the appearance, especially In the following situations, you need to be cautious!
1 potassium dihydrogen phosphate marked low content, the name is wrong, the label indicates trace elements such as copper, zinc, iron, manganese, boron, copper, molybdenum, chlorine, etc.;
2 marked with nitrogen fertilizer, such as NPK ≥ 50%, containing 18 kinds of amino acids ≥ 3%, zinc, molybdenum, boron ≥ 15%;
3 trace elements are unclear, such as trace elements ≥ 26%;
4 the name of the outer packaging with potassium boron dihydrogen potassium;
5 contains artificially synthesized plant growth regulators, such as containing complex sodium nitrate, indole acetic acid, gibberellic acid, indolebutyric acid, brassinolide, triazolone and the like.
6 The packaging is simple and rough. The name of the factory and the address of the factory are unknown. The contact telephone number does not work, and the words “pure productâ€, “high purityâ€, “importâ€, “authentic productâ€, “complex†and “nano†are indicated.
None of the above is truly available potassium dihydrogen phosphate. Due to the insufficient content of potassium dihydrogen phosphate, it does not play a good role, especially if it contains a large amount of trace elements with unreasonable ratio, and excessive use can cause fertilizer damage and reduce crop yield.
Select high purity potassium dihydrogen phosphate
High purity potassium dihydrogen phosphate contains less impurities and less metal salts, has good solubility, and is less prone to precipitation and clogging of the nozzle. The low-purity heavy metal salt content is high, polluting the environment and agricultural products, endangering human health; containing many impurities, may cause fertilizer damage, or affect solubility, block the nozzle, affecting the spraying efficiency and effect. The market price is generally higher in purity than in the low purity.
The water solubility is good, the potassium dihydrogen phosphate has good water solubility, high absorption rate and good effect.
Judging from the price: Where the market is 200 grams, 400 grams per bag, the product with the words "potassium dihydrogen phosphate", the retail price of the pesticide store is about 2 yuan, which can be judged as counterfeit potassium dihydrogen phosphate. The potassium dihydrogen phosphate content of these products is mostly zero, and some products are up to 15%, because the true potassium dihydrogen phosphate raw material 400 grams is much higher than 2 yuan, not to mention the finished product, the price is low. Not a manufacturer to make profits.
Technically judged:
1 Take a little heat on the iron piece, dissolve it into a transparent liquid, and solidify into a translucent glassy substance after cooling. If the appearance is white crystal or powder, take a small amount of exposure in the sun, the nature of the traits and color does not change can be considered as the real thing, if it is changed, it is doubtful.
2 Take one glass, pour half a cup of warm water, put 50 g of soda ash into the water, then stir until the soda ash is completely dissolved. Add 10 g of potassium dihydrogen phosphate to the soda ash solution. If there are a lot of bubbles, it is genuine. A large number of flocculent precipitates or other reactions are indicated as counterfeit and shoddy products.
3 use fire, if there is ammonia smell, are fake and shoddy products, because the real product does not contain nitrogen.
After the addition of zinc sulfate or ferrous sulfate to the aqueous potassium dihydrogen phosphate solution, precipitation occurs. If magnesium sulfate is used to irritate the aqueous solution, zinc sulfate and ferrous sulfate are not precipitated.
The use of potassium dihydrogen phosphate
Period of use
1 Soybean, Kidney Bean, Red Kidney Bean, Kidney Bean, Mung Bean, Rape: The best time to spray potassium dihydrogen phosphate is the soy period of soybean, etc. It is good to spray twice, 7 days apart. It is not suitable to use potassium dihydrogen phosphate in soybean seedling stage and flowering stage. In particular, the use of potassium dihydrogen phosphate in the flowering stage of soybeans can cause damage to soybean flowers and pods, causing the flowers to fall into the pods, and premature application is a measure to reduce production.
2 Rice, wheat, barley, oats: Both at the booting stage or in the filling stage, the filling period is preferably used twice, at intervals of 7 days.
3 corn: corn large bell mouth period to the tasseling period, or use during the filling period, it is best to spray 2 times during the filling period, 7 days apart.
4 vegetables: Solanum vegetables can use potassium dihydrogen phosphate after fruit setting, can be used multiple times, interval 7 to 10 days.
5 Fruit trees: Fruit trees are used after fruit setting, and are better used during fruit coloring and sugar-increasing periods.
6 Potato: The potato is sprayed 2 to 3 times with potassium dihydrogen phosphate after flowering.
7 beets, sweet potatoes, yam, taro and other root vegetables (radish, carrot): potassium dihydrogen phosphate can be used during the period from the root enlargement to the sugar-increasing period.
8 pumpkin, cantaloupe, watermelon, and melon: can be used after fruit setting, spraying 2 to 3 times.
9 cotton: cotton is used after the fruit is inflated and sprayed twice.
10 Peanut: Peanuts are used after the fruit is inflated and sprayed twice.
Dosage
Field crop 86% potassium dihydrogen phosphate dosage 1500 ~ 3000g / hm?, potassium dihydrogen phosphate good solubility, spraying mechanical standards, the use of technical specifications for low amounts; potassium dihydrogen phosphate is best with chlorophyll (750ML / hm?) + Yi protection (750ML / hm?) + rice vinegar (with the amount of spray 1% ~ 2%) mixed, increase production and improve quality, anti-dry hot wind, induced disease resistance is more obvious. The fruit tree uses 1% of the spray volume, that is, 100 L of water plus 1000 g of potassium dihydrogen phosphate.
In addition, potassium dihydrogen phosphate can be mixed with pesticides (bactericides, insecticides), functional plant nutrients (such as vitamins, benefits, enzymes, etc.), brewing vinegar, biological agents, vegetable oil spray additives, etc. .
Instructions
Sprayed by spraying. The key to the application of potassium dihydrogen phosphate is the spray technique. The sprayer is not standard. If the nozzle type is wrong, the amount of liquid spray is too large, and the quality of potassium dihydrogen phosphate is good. It is necessary to ensure the spraying effect and give full play to the effect of increasing the yield of potassium dihydrogen phosphate. The amount of liquid spray: artificial 100 ~ 150L / hm?, spray bar sprayer 75 ~ 100L / hm?, aircraft 30 ~ 50L / hm?.
Weather condition
It is suitable for meteorological conditions with a temperature of 13 to 27 ° C, a relative humidity of 65% or more, and a wind speed of 4 m/s or less. The meteorological conditions unsuitable for spraying are temperature less than 13 ° C, greater than 27 ° C, air relative humidity less than 65%, and wind speed greater than 4 m / s. The crops are photosynthesis from 9:00 am to 6:00 pm, and the water holes and pores are closed and do not absorb water. Before 6 pm to 9:00 am the next day, the pores and water holes are open to absorb water, so the sunny day is 8:00 pm before 8:00 pm. After spraying, the spray works best when there is no dew at night.
How to spray under high temperature and arid meteorological conditions
In order to solve the problem of severely affecting the effect of spraying pesticides and foliar fertilizer under high temperature and arid meteorological conditions, experts in the industry have summarized and promoted the new technology of two drops and one plus pesticide spraying, that is, using imported nozzles and filters to reduce the amount of liquid spray and adding vegetable oil type. Spraying auxiliaries can reduce the amount of potassium dihydrogen phosphate and its mixed pesticides and biological agents by 20% to 50%.
The surface of the leaf is sprayed with potassium dihydrogen phosphate, and the artificial spray is selected from 80015 type fan nozzle with 100 mesh column type anti-drop filter. The nozzle is 46cm from the ground, the spray pressure is 196 kPa, and the spray volume is 105-150L/hm?.
The spray bar sprayer generally uses 80015 fan nozzles with 100 mesh column type anti-drop filter. The nozzle is 50cm apart on the spray bar, the nozzle is 46cm from the ground, the spray pressure is 294kPa, and the spray volume is 75~100L/ Hm?, the speed is 6~8km/h.
Large self-propelled sprayer (including self-propelled high-beam sprayer) uses 8002 fan nozzle with 50 mesh column anti-drop filter, nozzle height 46cm from the ground, spray pressure 392 ~ 490 kPa, spray volume 75 ~ 100L / hm?, the speed of 10 ~ 12km / h.
How to determine the amount of potassium dihydrogen phosphate reduction
Under suitable meteorological conditions, generally from 6 pm to 8 am (when there is no dew at night), add 0.5% vegetable oil spray aid to reduce potassium dihydrogen phosphate and mixed pesticides and biological agents 30% to 50%. Dosage. When spraying, it encounters high temperature and arid meteorological conditions. On sunny days, when the farm is catching up, the wind speed is below 4m/s, and the spray amount of 1% vegetable oil spray additive is added to reduce the amount of potassium dihydrogen phosphate and mixed pesticides and biological agents by 20% to 30%. (China Agricultural Materials)
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