Fruit-Tree Cultivation, Management and Evaluation

Variety traits and selection

A fruit tree gives fruit for 15 to 30 years, so the choice of variety matters a lot. Compare ripening time, fruit size, sweetness, colour, storage life, disease resistance and the cold or heat the tree can bear. Many fruit trees are made by grafting: a branch of the good variety (scion) is joined to the root of another tree (rootstock). The rootstock decides tree size, how soon fruit comes and how well the tree handles soil problems.

Choose a variety that suits your climate and your market, and buy healthy, certified plants.

Cropping types and cultivation plans

For a fruit tree the cropping type means the yearly cycle: flowering, fruit set, fruit growth, ripening, harvest and rest. Some orchards use facilities (tunnels, rain shelters) to change the harvest time.

The orchard plan decides: how far apart to plant (spacing), rows and direction (sun on both sides), rootstock (dwarf or standard), pollinator trees (some fruits need a second variety nearby), water and drainage, and the expected yield year by year. Dwarf rootstock gives small trees, more trees per area and fruit in about 3 years. Standard rootstock gives big trees and fruit after about 6 years. If trees are too close, branches shade each other and fruit stays small and pale.

Crop management

Fruit trees need yearly care.

• Pruning: cut crossing, dead and crowded branches so light and air reach inside the crown. Prune in the rest season.
• Fruit thinning: remove extra young fruits so the remaining ones grow bigger and the tree gives fruit again next year.
• Bagging: cover single fruits with paper bags to keep off insects, birds and spray.
• Feeding and watering: spread manure in a ring under the branch tips, where the feeding roots are.
• Pest and disease care: look weekly, remove sick parts, and spray only when needed.

Commercialisation and product management

Harvest at the right maturity: look at colour, firmness and sugar level (measured by a Brix meter, in percent). Handle fruit gently, because bruises spoil quickly. Then grade by size, colour, sweetness and damage; pack in cushioned boxes; and keep cool. Sweet, even fruit is sold as premium to shops and for export. Smaller or marked fruit goes to the local market or to juice and jam.

To evaluate, record yield per tree, share of premium fruit, cost and income. Compare year by year.

Using machinery and facilities

An orchard uses speed sprayers for pests, mowers between rows, platforms for pruning and picking, and sorting machines that measure size and colour. Hail nets and rain shelters protect fruit from storm damage and cracking. Drip lines give water exactly where roots are. All machines must be used with the safety rules: guards on, protective clothing, children away.

Try it

Visit a fruit shop. Pick 8 apples or oranges, and sort them by size on a table into Large and Small. Which group would a shop pay more for? Next, ask a family member to taste: which is sweeter? Compare with the sugar-limit slider in the 3D.

Key formulas and definitions

• Trees per 10 m x 10 m = floor(10 / spacing) squared
• Dwarf rootstock: fruit in about 3 years; standard: about 6 years
• Premium share (%) = premium fruit / total fruit x 100
• Sugar level (Brix) is measured in percent
• Income = kilograms of each grade x price of that grade

Worked examples

Common mistakes

• Planting trees too close to get more trees. Shaded branches give small, pale fruit.
• Skipping pruning, which leaves a dark crowded crown with poor fruit.
• Letting all the young fruit stay. The tree gives many small fruits and may skip next year.
• Putting manure at the trunk instead of under the branch tips, where feeding roots are.