How to use growth regulators scientifically for fruit trees

How do fruit trees use growth regulators scientifically? For advice on the use of plant growth regulators, please refer to: 1. The cuttings take root. Mainly used for grape, kiwifruit, apple dwarfing rootstock. The agents of Changchuan are indole butyric acid (IBA), naphthylacetic acid (NAA) and sodium naphthalene acetate in auxins. Usage: ① high concentration rapid dipping method. Soak the base of the cuttings in a high concentration solution (500 to 1000 microliters / liter) for about 5 seconds, then insert them into the cutter immediately. ② low concentration immersion method. Generally, the concentration of 50 μ L / L is 200 μ L / L, and the soaking time is 8 ~ 24 hours. The concentration is high and the soaking time is short. ③ powder dipping method. First dissolve the growth regulator in alcohol, then soak the talc or clay in alcohol containing 1000-5000 microliters / liter of the active ingredient of the growth regulator, and the alcohol volatilizes to get the powder. Before soaking the cuttings with powder, soak the base with water and shake off the excess powder after dipping it. two。 Inhibit the growth of new shoots and promote flower bud formation. Mainly paclobutrazol. Scope of use of ①. It is mainly used for kernel fruit, drupe and citrus, and the effect is obvious. it can increase the flower bud of young apple tree, decrease the flower node position of peach tree, and increase the number of flower bud node, but it is not obvious on grape. How to use ②. Canopy spraying and soil spreading. Among them, the duration of soil application is long, which can be up to 2-3 years, with less dosage, convenient operation and labor saving. It can also be smeared with tree trunks. This method can only be used for 2-and 3-year-old young trees. The method is to dissolve the pesticide in a non-toxic organic solvent or a high concentration solution (1000 microliters / liter), and then apply it to the unaged branches and trunks, 0.1g / plant. ③ note: only prosperous trees can be used, weak trees and 1-year-old and 2-year-old young trees can not be used; continuous use for 2 years at most, if you still need to use it, you should stop using it for 1-2 years and then resume use; the dosage can be small but not excessive; planting over-dense orchards should not rely on paclobutrazol. The suitable planting distance should be determined according to the dwarfing degree of rootstock and scion varieties. 3. Young trees should be reshaped to increase the number of branches. ① promoted shoots to increase the number of branches. When synthetic cytokinins (benzyladenine) or Punomalin (cytokinins + gibberellin) were sprayed at 150 × 600 microliters / liter from June to July, secondary shoots germinated in 5-7 days, and a maximum of 18 secondary shoots could be produced. Shaping in the ② nursery to cultivate large seedlings with branches. The branched seedlings with large base angle can be cultivated by spraying with 150 μ L / L benzyladenine or Punomalin when the seedlings grow to a suitable height (when the fixed dry height is satisfied). ③ fixed-point orientation makes cryptic buds send out long branches with a large angle. During the growing period, 100 microliters / liter ointment prepared with benzyladenine and lanolin was applied under the hidden buds of the required shoots, which could promote the hidden buds to germinate. 4. Promote fruit setting and increase fruit. The fruit setting rate of Hawthorn at the early stage of flowering could be increased by treating Hawthorn with 10 μ L / L gibberellin. The treatment of fruit drop caused by the vigorous growth of new shoots can also increase the fruit setting rate. The fruit setting rate of western pear, Jingbai pear and crisp pear could be increased by using gibberellin of 50 μ L / L and 20 μ L / L, respectively, and the fruit was sprayed with gibberellin 5 μ L / L at full flowering stage for the first time, and then spraying "seedless white" grape with 20 μ L / L gibberellin 2 weeks later, combined with ring cutting of mother branch to double the size of fruit. 5. Prevent fruit from falling before harvest. After long treatment with 20 μ L / L naphthalene acetic acid and 1000 μ L / L 2000 μ L / L, the fruit drop before harvest was reduced and the coloring was improved. 6. Advance or postpone fruit ripening. In sand pear system, 100 microliter / liter ethephon was sprayed 20-30 days before fruit ripening, while 400-800 microliter ethephon was used in Qiuzi pear system. The concentration of weak trees was low and the concentration of prosperous trees was high. Spraying at 135-140 days after flowering could ripen 14-20 days earlier. 7. To prevent the sprouting of branches and root growth in large wounds. Smear 0.5%-1% naphthalene acetic acid lanolin on the large cutting mouth to prevent the sprouting and growth of long branches. For the dwarfing rootstocks which are easy to produce root tillers, spraying at 20-30 days after root tillering can effectively inhibit the growth of root tillers. Click to view more regulator use techniques click to view more pesticide use techniques click to view more fruit tree planting techniques