Timely control water and cut roots. During the formation of flower buds, proper control of water supply and root cutting in orange plum gardens is one of the effective measures to promote flower bud differentiation. Citrus fruiting trees generally start proper water control during the period of heavy snow to winter solstice. During the water control period, the leaves of autumn shoots are required to have a little curl at noon on a sunny day and return to their original state in the morning. At the same time, after the autumn shoots are mature and full to the period of flower bud differentiation in December, the effect will be more significant by combining water control to cut the roots and promote the flowers.
The method is to hoe the soil and cut the roots around the canopy, hoe young trees and vigorous trees about 15 cm deep, and hoe the middle-aged trees shallowly about 10 cm. The leaf color of autumn shoots should have obvious chlorosis after water control and root cutting.
Ring cutting (or ring tying) to promote flowers. Ring cutting or ring tying (iron wire) is the most effective method of citrus flower promotion technology and the most powerful response of the tree. The best time for circumcision or ligation is from late November to late December.
The circumcision method is to make a circle on the main trunk or 1 to 2 branches, cutting the cortex without hurting the quality of the operation. About one week after circumcision, the canopy can be seen to be green. For cerclage, use No. 16 or No. 14 iron wire, and its position is according to the method of circumcision. After cerclage, 2/3 of the iron wire goes deep into the cortex without damaging the qualitative part of the operation to achieve the purpose of flower promotion.
Pull branches to promote flowers. Pulling branches to promote flowering is a safer and more effective method of citrus flowering promotion measures. The method is to use hemp rope or plastic tape to pull out and bend the big branches in the upper middle of the crown (the rope is fixed to the ground) after the autumn shoots are mature or in December, so that the crown is exposed to a proper "hollow" shape, and then after a period of time (About 3~5 weeks) The color of the posterior leaves is slightly chlorosis before it is released.
Bent branches and twisted branches promote flowers. Bent branches and twisted branches are auxiliary flower promotion measures, mainly for the branches of some young trees that are too strong or long to grow. The specific method is: After the autumn shoots mature from November to December, use plastic tape to bend the strong and long branches that need to be bent. When the leaf color fades from dark green to light green, you can untie it. Twisted branches are mainly for individual thick and long fruiting female branches at the top of the canopy. During the differentiation of flower buds, hold the base of the branches to twist, requiring damage to the cortex and xylem. After a few days, the color of the dark green leaves obviously fades to light green, indicating that the flower has reached the acceleration effect.
Use plant growth regulators to promote flowers. At present, commonly used plant growth regulators are: 15% paclobutrazol 300 times liquid or fruit tree flower promoting agent, spray on the leaves after the autumn shoots mature, spray twice, every 20 to 30 days; 2, 4-D20 To 40 mg/L, spray once after the autumn shoots are mature, but this medicine is more sensitive and should be used carefully according to different varieties. Paclobutrazol has an inhibitory effect on the growth of citrus, and is generally not suitable for use on old and debilitated trees.
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