High-Yield Blueberry Cultivation Techniques: A Detailed Guide to Fruit Tree Pruning Methods
Blueberries are small in size, taste sweet and tart, have certain antioxidant properties, and are highly profitable to grow. With the popularity of blueberry picking, many places have set up blueberry plantations where you can pick the fruit yourself, adding a bit of fun. Below, let us learn about the necessity and methods of pruning fruit trees in high-yield blueberry cultivation techniques.
The purpose of pruning blueberries is to regulate the conflict between reproductive growth and vegetative growth, solve the problem of ventilation and light penetration in the plant, achieve the best yield rather than the highest yield, and extend the fruiting years.
I. Main pruning methods
The main pruning methods for blueberries are: heading back, thinning branches, renewal pruning, coppicing, removing sprouts (bud rubbing), tip removal, flower thinning, and fruit thinning.
II. Pruning periods
Blueberries can be pruned in all four seasons, generally with winter pruning as the main practice and summer pruning as a supplement. Pruning after leaf fall and before bud break is called winter pruning, and pruning after bud break until leaf fall is called growing-season pruning. The best pruning period in Chengjiang is from November to December.
Winter pruning methods include: heading back, thinning branches, renewal pruning, and coppicing. Growing-season pruning methods include: removing sprouts (bud rubbing), tip removal, flower thinning, fruit thinning, heading back, and thinning branches.
III. Pruning tree shapes
The main shapes are the multi-main-branch two-tier open-center shape (suitable for cultivation with wider row spacing) and the natural clump shape (suitable for dwarf, close planting with a small tree body).
IV. Determining pruning intensity
Pruning intensity should be determined according to the use of the fruit: if for processing, the fruit size should be uniform, and pruning should be light so as to increase yield; if for fresh market sale and raw eating, pruning should be heavy to increase commercial value. Young trees should be pruned lightly, and old trees should be pruned heavily.
V. Order of pruning
First cut off diseased and pest-damaged branches and dead branches; second, prune large branches first, then small branches; third, thin out blind branches, overly dense crossing branches, overlapping branches, and parallel branches; fourth, carry out appropriate renewal pruning according to the density and growth vigor of the branches; fifth, carry out heading back according to the thickness and growth vigor of one-year-old branches, leaving more flower buds on thick and strong ones and fewer flower buds on thin and weak ones.
VI. Pruning young trees
At planting, prune by cutting off diseased and pest-damaged branches and dead branches; thin out weak and small branches; and head back branches with flower buds, cutting off the flower buds. The purpose is to allow a certain yield in the year of planting while also ensuring the vegetative growth of the blueberry plant. The number of flower buds retained is determined according to the size of the plant. Flowering and fruiting will inhibit vegetative growth. The main purpose of the young tree stage is to promote root development, expand the canopy, and increase branches. Therefore, pruning in the young tree stage is mainly to remove flower buds.
VII. Pruning mature trees
Blueberries currently planted in Chengjiang are densely planted, and with a long growing period, if managed well, they close their rows in the second year and enter full fruiting; some enter full fruiting in the third year. At this time, pruning is mainly to control tree height, thin branches, and control flower quantity. Cut off post-fruiting branches, diseased and pest-damaged branches, and dead branches; thin out excess sprouting branches at the base and cut off thin and weak lower branches and aged branches; thin out overly dense branches in the center of the tree to ensure light penetration through the tree center.