1. Precautions for spraying potassium dihydrogen phosphate

1 Spraying concentration: The concentration of crop seedlings is generally 0.05-0.1%, and the concentration used in the middle and late stages is generally 0.2-0.3%; the commonly used concentration is about 0.2%.

2 The number of spraying: Generally, the number of times of use during the growing period of the crop is 2-3 times, and the maximum number of times of use is not more than 4-5 times.

3 spraying parts: generally spray the leaves, new. In the spraying effect, the leaf back > leaf front, new leaf > old leaf, new slightly > old.

4 Spraying time: morning or evening (before 10 am or after 4 pm), spray once every 5-10 days.

Potassium dihydrogen phosphate concentration calculation method: such as 0.1 concentration - the concentration of 1 gram of potassium dihydrogen phosphate added to 1 liter (1 kg) of water.

Second, the common crop application concentration and method of use

1, flowers

1 soaking seeds: 1 kg of seeds + 2 g of potassium dihydrogen phosphate + 0.5 kg of water, soaking seeds for 12 hours, so that the seeds germinate early, grow long seedlings, grow strong seedlings, prevent lodging.

2 seed dressing: 1 kg seed + 2 g potassium dihydrogen phosphate + 0.1 kg water, evenly seeded, promote early seed germination, long seedlings, anti-lost.

3 roots: Before transplanting, use 0.1% concentration of roots to increase the survival rate, promote leaf hypertrophy, and improve flower aroma.

4 Spraying: Using a concentration of 0.3%, spray the leaves to promote flowering and flowering, and to increase the brightness of the flowers.

2. Field crops

1 wheat: seed dressing - 1 kg of wheat + 25 g of potassium dihydrogen phosphate + a small amount of water, after planting, piled up for 3 hours with dryness; soaking seeds - 1 kg of wheat + 20 g of potassium dihydrogen phosphate + over the surface 1 cm of water, soaking seeds for 12 hours; spraying - 2-3 times during the regreening period to the filling period, the concentration is generally 0.2-0.3%, and the dosage per acre is generally 150-300 grams. Make the wheat emerge early, the seedlings are strong, improve the grain fullness, increase the yield, and prevent dry hot wind.

2 Rice: Spraying - can be used in the tillering, jointing and booting stages, 200g + 15kg of water per acre to promote tillering, enhance growth and increase yield.

3 corn: soaking seeds - 0.2% concentration of potassium dihydrogen phosphate solution soaking seeds for 12 hours dry use; spraying - jointing period, large bell mouth period, filling period, the use concentration is generally 0.2-0.3%, per acre 200 g + 15 kg of water; with the effect of promoting seedlings, strong seedlings and increasing yield.

3. Cash crops

1 Soybean: seed dressing - 200g potassium dihydrogen phosphate + small amount of water for seed dressing; spraying - use in seedling stage, full bloom period, drum stage, 150g + 15kg of water per acre; , multi-pod, less disease, anti-fall, increase production.

2 Peanut: Spraying - use in the lower needle period, pod-forming period and full fruit period, 200 grams per 15 mu + 15 kg of water; strong stalks, multi-pod, full grain, less disease, increase yield.

3 cotton: spraying - use in seedling stage, bud stage, flowering stage, 150 grams per 15 mu + 15 kg of water, strong straw, multi-peach peach, knot big peach, prevent premature aging, increase yield, and improve quality.

4 Tobacco: Spraying - After the topping of tobacco, the concentration is generally 0.5%, sprayed twice continuously, once every 15 days; improve the quality of tobacco.

6 rapeseed: spraying - seedling stage, flood season, flowering period, seedling period 50-100 g + 15 kg water, flood season 150-200 g + 30 kg water, flowering period 300-400 g + 30 kg water, flowering period 200-300 g + 30 kg of water before maturity; strong seedlings, promote growth, full grain, less disease, increase production.

7 Tea: Spraying - use concentration of 0.2-0.4%, increase leaf color, leaf buds to enrich and increase yield.

8 Garlic: Spraying - use before winter, after returning to green, use concentration 0.1-0.2%, strong seedlings to protect trees, promote growth and strong trees, prevent disease.

9 radish (white radish, carrot): spraying - after planting, expansion period, use 50-80 grams per 50 acres + 50 kg of water; strong trees promote growth, reduce disease, prevent deformed fruit, uniform, improve quality.

10 potato tubers (sweet potato, potato): spraying - branching and potato phase, stem and leaf growth period, expansion period, 60-100 grams per acre + 50 kilograms of water; promote long-lasting, supplement nutrition, prevent premature aging Promote the expansion of potato chips and increase production.

Onion: Spraying - use in the nursery period, 40-50g/30kg water per mu; 60-80g/50kg water per mu before transplanting; harvesting seedlings, promoting growth, increasing yield, lifting quality.

4, apple, peach, pear, grape, cherry, citrus and other fruit crops

Base Shi - base fertilizer application 500-800 grams per tree; spraying - flowering, young fruit, and fruiting period, 200-400 grams per 100 acres + 100 kilograms of water spray every 10-15 days Spray once; enhance tree potential, preserve flowers and preserve fruit, promote coloring, increase sugar content, and improve quality. It can be combined with trace elements such as 0.2-0.3% urea solution and 0.1-0.2 borax, and the effect is better.

5, fruit crops

1 watermelon, melon: spraying - use in the fruiting period, the concentration is 0.2-0.3, combined with 0.1% borax and other trace elements, spray once every 7-10 days, spray 2-3 times; promote Fruit enlargement, prevention and treatment of premature aging, reduction of disease, increase of yield, and improvement of quality.

2 Strawberry: Spraying - before and after flowering, use concentration 0.2-0.3%, use 2-3 times, increase fruit setting rate, increase single fruit weight, promote coloring, increase sugar content, increase yield and improve quality.

6, vegetable crops

1 dip seed dressing: used before sowing, the general concentration is 0.2%, soaking seeds for 12 hours; promote early germination, strong roots, strong seedlings, strong trees.

2 roots: use before transplanting, mix 0.3-0.4 kg of potassium dihydrogen phosphate + fine dry soil per acre, then add water to adjust the pulp, use the roots of nursery; promote early roots, early seedlings, improve transplant survival rate .

3 spraying: Solanum melon beans and vegetables (such as cucumber, tomato, eggplant, beans, etc.), the fruit is used during the expansion period, generally used in a concentration of 600-800 times; promote fruit enlargement, reduce disease, prevent abnormal fruit, promote color To prevent premature aging, increase production, and improve quality. Combined with 1-2% urea solution and 0.1-0.2% borax solution, the effect is better.

Third, the potassium dihydrogen phosphate solution homemade method

1. Preparation of raw materials: grass ash, superphosphate, water, container

2, the production method: 1 5 kg of ash is placed in 25 kg of water soaked, then add 2 kg of superphosphate while stirring, fully stirred and then allowed to stand for 6-10 hours, filter out the upper layer of filtration liquid, leaving Sediment; 2 add 20 kg of water to the sediment, stir again, soak, and filter out the supernatant; 3 pour the two solutions together, then add water to dilute to 50 kg, the liquid is Potassium dihydrogen phosphate solution.

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