CPPU is a phenylurea plant growth regulator with cytokinin activity. As a technical measure for high-yield, high-quality and efficient agriculture, plant growth regulators have been widely used around the world.
1. Is Forchlorfenuron(CPPU) safe?
Forchlorfenuron(CPPU) is the most active cytokinin currently synthesized. The biological activity of CPPU is 10-100 times higher than that of 6-benzylaminopurine.
Forchlorfenuron(CPPU) is a plant growth regulator that has been approved by the state and can be used on plants. Expanding agents are currently widely used, and long-term use practice has proven that they are harmless to the human body.
Plant growth regulators have low toxicity and small dosage. The usage concentration is generally on the order of one part per million. They are easy to degrade. As long as they are used according to the specified usage period and dosage, there will be no problem of excessive residues, let alone accumulation in the human body.
2. Main dosage forms
0.1%, 0.5% soluble agent, 0.3%, 0.35%, 0.5% gibberella CPPU(KT-30) soluble agent, etc.
3. Yield increase mechanism
Enhance photosynthesis rate, promote fertilizer and water absorption, and regulate directional distribution of nutrients (prevent waste).
4. Applicable crops
Forchlorfenuron(CPPU) is widely used in crops, mainly used in fruit trees: such as apples, pears, bananas, pineapples, strawberries, papayas, peaches, plums, apricots, cherries, pomegranates, grapes, walnuts, ginkgo, dates, citrus, orange, pomelo, lychee , longan, loquat, bayberry, coconut, mango, avocado, hawthorn, etc.
Vegetable food crops: such as cucumbers, tomatoes, eggplants, bitter melons, winter melons, potatoes, potatoes, taro, ginger, onions, etc.
Medicinal materials: ginseng, astragalus, platycodon, bezoar, coptis, angelica, chuanxiong, rehmannia root, atractylodes, white peony root, poria, Ophiopogon japonicus, silver flower, chrysanthemum, cyperus, licorice, notoginseng, cinnabar, wolfberry, sophora flavescens, etc.
5. Main functions
Forchlorfenuron(CPPU) can affect the development of plant buds, accelerate cell mitosis, promote the horizontal and vertical growth of organs, promote cell enlargement and differentiation, promote fruit enlargement, prevent fruits and flowers from falling off, and increase yield.
Delays leaf aging, keeps green for a long time, strengthens chlorophyll synthesis, improves photosynthesis, and promotes leaf color to deepen and turn green.
Breaking the top advantage and promoting the germination of lateral buds can penetrate the differentiation of buds, promote the formation of lateral branches, increase the number of branches, increase the number of flowers, improve pollen fertilization, thereby increasing the number of fruits and increasing yield. Improve crop quality and enhance marketability.
Induces parthenocarpy, stimulates ovary enlargement, prevents flower and fruit drop, promotes protein synthesis, increases sugar content, etc.
6. How to use
(1) Melons and cucumbers: On the day when female flowers bloom or 2-3 days before flowering, mix 0.5-1kg of water per 10mg at 10-16 ℃, 1-1.5kg of water per 10mg at 17-25 ℃, and 1.5-2kg of water per 10g at 26-30 ℃ to form a uniform solution.
Soak the melon embryo or use a mini spray to evenly spray the spray melon embryo. After application, the melon rate reaches 98% -100%, and the young melon grows fast, is big, has good quality, and comes into the market early.
When there is insufficient low temperature light and poor flowering and fertilization conditions, in order to solve the problem of "turning melons", on the day before or on the day of flowering, apply 0.1% soluble liquid 20 times the liquid to the stem of the melons, which can increase the fruit setting rate, promote fruiting, make the fruit size uniform, increase yield, and improve quality.
(2) Watermelon and melon: on the day or one day before and after the female flower opens, spray the melon embryo with a spray or coat the fruit stalk with 20-33 times of 0.1% soluble liquid agent for one circle, which can prevent the phenomenon of difficult fruit setting and melon melting caused by overgrowth of watermelon and no insect pollination, improve the fruit setting rate and yield, and increase the sugar content.
(3) Tomatoes, eggplants, and zucchini: Use 5-15mg/kg liquid to soak young fruits after the flowering stage, which can increase fruit setting rate, expand fruit, and increase production.
(4) Grapes: 10-15 days after flowering, soak the young fruits with 0.1% soluble liquid 10-100 times, which can increase the fruit setting rate, increase the weight of single fruit, make the fruit enlarge, gain weight, and increase the content of soluble solids.
Using 3-5 mg/kg liquid 14-18 days before blooming and 10-15 days after blooming, soaking or spraying fruit ears with 3-5 mg/kg liquid can cause fruit enlargement and increase yield by more than 80%.
Varieties such as Jufeng and Teng Nian: Each 10mL is soaked in 1-1.5 kilograms of water. After about 15 days of flowering, the fruit ears are soaked (or evenly sprayed) once, significantly increasing the size of seeded fruits (20-40 %) and seedless fruits (such as seedless white and Venus seedless) by 1-3 times. The fruit shape is compact and has good commercial value.
For varieties with severe flower and fruit drop and sensitive to climate conditions during the flowering period (such as Kyoho), the effect of promoting fruit setting is very significant, greatly increasing the yield.
(5) Tobacco: Increase new buds, accelerate the formation of buds, and promote the growth functions of stems, leaves, roots, and fruits, making the leaves hypertrophy and increasing yield.
(6) Apples, citrus, peaches, pears, plums, lychees, and longans: Use 5-20mg/kg to soak the fruit stems and spray the young fruits 10 days after blooming, which can promote coloration, increase fruit setting rate, increase fruit size, and increase yield.
(7) Navel orange: Before physiological fruit drop, i.e. 25-30 days after flowering, spraying a 0.1% soluble liquid 50-200 times the solution on the tree crown and densely packed fruit stems twice can significantly increase the fruit setting rate, prevent fruit drop, and accelerate fruit growth.
(8) Kiwifruit: Soak the young fruit in 5-10mg/kg solution 20-25 days after withering, and spray twice with 10ppm on 21 days after falling flowers. The fruit can swell by 30-100%, increase sugar content by 1.4-2.7%, Vc content by 16.4-24.6%, and increase single fruit weight by 50%.
It can cause fruit enlargement and weight gain per fruit without affecting fruit quality.
(9) Loquat: Soak the young fruit in a 0.1% soluble liquid 100 times the diameter of 1cm, and then soak the fruit again after one month. Timely use of medication after the fruit is frozen can promote fruit enlargement.
(10) Honey orange: Using a solution of 0.5mg/kg once during the peak flowering period, and spraying the tree crown once at the end of fruit setting and falling can improve the fruit setting rate.
(11) Hawthorn: Spraying 10mg/kg of medicinal solution during the peak flowering period can increase fruit setting rate, swelling, and increase single fruit weight.
(12) Cherry: Spray 5mg/kg of medicinal solution during the peak flowering period to increase fruit setting rate, expand fruit, and increase yield.
(13) Peanuts: Spraying 1mg/kg during the pod setting period can increase chlorophyll, pod and fruit numbers. During the pod setting period of Guangdong Spring Flower's Guangdong Oil 116, spraying peanut leaves with a concentration of 1mg/LCPPU solution can increase leaf thickness, chlorophyll content, photosynthetic rate, pod setting rate, full fruit rate, and hundred kernel weight, resulting in a yield increase of about 12.6% per plant.
(14) Potato: Spraying with 100mg/kg solution 70 days after planting can significantly increase yield.
(15) Rice: Spraying 15 mg/kg of medicinal solution 10 days after heading can preserve greenery, promote reproductive growth, develop root systems, and increase yield.
(16) Strawberries: After picking, spray or soak the fruits 100 times with 0.1% soluble liquid, air dry and store, which can extend the storage period.
(17) Cherry Radish: Spraying 20 times a 0.1% soluble liquid during the 6-leaf stage can shorten the growth period and increase yield.
Expanding fruit white radish: Spray 5mg/kg of medicinal solution on the leaf surface during the period of fleshy root enlargement, once every 4 days, for a total of 4 times, which can inhibit the pith and sprouting of spring greenhouse radish and increase yield.
(18) Soybean: Spraying 0.1% soluble liquid 10-20 times (50-100mg/L) during the initial flowering period can improve photosynthesis, increase protein content, and increase yield. Spraying 1mg/kg of medicinal solution during the podding stage can promote reproductive growth and increase yield.
(19) Sunflowers: Spraying 0.1% soluble liquid 20 times during flowering can make the seeds plump, increase grain weight and yield.
(20) Barley and wheat: Spraying flag leaves with a 67 fold solution of 0.1% soluble liquid can increase yield. Spraying 1mg/kg of medicinal solution 10 days after heading and during the flowering period can promote reproductive growth and increase yield.
(21) Plum: Spraying 5mg/kg of medicinal solution 10 days after flowering can increase single fruit weight and yield.
7. matters needing attention
(1)CPPU is mainly used for fruit setting, and when used, it should be treated towards the flower and fruit. It should be used with caution on melons and watermelons, especially when the concentration is too high, which can lead to side effects such as fruit cracking.
(2)Grapes should be used according to requirements and the concentration should not be increased arbitrarily. Using a concentration that is too high can easily reduce the content of soluble solids, increase acidity, slow down coloring, and delay maturation.
(3)Used on old, weak, diseased plants or weak branches that have not been thinned, the fruit grains do not swell significantly; To ensure the necessary nutrients for fruit enlargement, the fruit should be thinned appropriately and the amount of fruit should not be too much.
(4)The mixed use of CPPU with auxin or gibberellin is more effective than single use, but it must be done under the guidance of professional personnel or under the premise of trial and demonstration, and should not be used arbitrarily.
(5)When using CPPU, corresponding cultivation and management measures need to be taken, including suitable usage period, plant growth, fertilizer and water management, etc. Blindly using it will not only result in unsatisfactory results, but may even lead to some side effects.
(6)Strictly control the concentration and application frequency. The amount of CPPU used is small and the effect is significant. The concentration used should be accurately prepared according to the crops and regulatory purposes on the label, and the dosage and amount of water should not be increased arbitrarily. It is recommended to carry out under the guidance of professional personnel.
(7)After 12 hours of treatment, if encountering rainwater, it is necessary to spray again.
Proper use of CPPU can promote fruit setting and swelling, achieving the goal of increasing yield and improving quality. But at the same time, if not taken seriously, it may not only fail to achieve the desired effect, but also produce side effects. So it is important to pay attention to scientific and rational use.
