Technique of planting trees to block wind and shade coffee

Robusta coffee needs 30-40% shade and wind protection to reduce evaporation and limit leaf burn in the dry season. Instructions for choosing tree types, arranging and managing shade systems for Central Highlands orchards.

Summary: Robusta coffee naturally lives under the forest canopy. Plants grown in direct sunlight all day have a yield of 4-5 tons per hectare but their lifespan is reduced. Plants grown with a suitable shading system reach 3.5-4.5 tons of kernels but have a lifespan of 25-30 years, have few pests and diseases, and require little irrigation water. This article guides the design of optimal shading and wind protection systems for Central Highlands orchards.

Applies to: New or renovated coffee orchards in Dak Lak, Lam Dong, Gia Lai, Dak Nong, Kon Tum.
Duration: Plant auxiliary plants before or at the same time as coffee. The tree becomes effective after 2-4 years.
Difficulty level: Medium.
Estimated additional costs: 10-20 million VND per hectare for auxiliary trees and planting labor.

Benefits of shade systems for coffee

A orchard with a good shading system brings:

Reduces evaporation in dry season — saves 25-40 percent of irrigation water.
Reduces leaf and fruit scorching when the sun is hot in February-March.
Increase air humidity — Robusta plants grow better in 70-80 percent humidity.
Reduce heat shock between hot days and cold nights — especially in the highlands of Lam Dong.
Biodiversity — more natural enemies for pests and diseases.
Less soil erosion — tree canopy reduces the impact of heavy rain.
The lifespan of a coffee tree lasts 5-10 years compared to an unshaded orchard.

On the other hand, excessive shading (over 50 percent) causes coffee to flower poorly and productivity to decrease. There must be a balance between the two — aim for 30-40 percent shade for commercial coffee.

Classify auxiliary plants according to function

Tall shade trees in the orchard

Intercropped with coffee, 6-10 meters high. Spread wide to shade:

Avocado tree (*Persea americana*): moderately thick canopy, deep roots. Earn income from avocados. The most popular recommendation in the Central Highlands today.
Durian tree: thick canopy, deep roots. Dual benefits — shade + income from durian. Need to invest carefully.
Jackfruit tree: thick canopy, easy to grow. Earn income from jackfruit. Need to prune branches a lot to not cover them too much.
Leucaena leucaena (*Leucaena leucocephala*): legume, nitrogen fixer. Fast growing but shallow roots — competing for water with dry season coffee.
Black star tree, otter oil: deep roots, does not compete for water. Valuable wood. Slow growth.

Windbreak trees around the orchard

Planted around the orchard perimeter, 6-10 meters high, thick canopy to block the wind:

Acacia auriculiformis (*Acacia auriculiformis*): legume, fast growing. Valuable wood. Plant double rows 2 meters apart.
Anchor tree (green tree): grows quickly, spreads thinly, does not shade coffee at the edge of the orchard too much.
Casuarina tree (*Casuarina equisetifolia*): areas with strong winds should be considered. Evenly tall, easy to plant in rows.
Bamboo tree: planted as a thick fence, very good at blocking the wind. Especially in windy areas of Laos.

Crops grown in rotation

When coffee is young (first 1-2 years), intercrop short-term crops:

Beans, peanuts, soybeans: legumes, soil improvement.
Corn, cassava: short-term income.
Green cover crop (wild peanut grass, *Arachis pintoi*): no income but improves soil, reduces weeds.

System layout

Perimeter windbreak

Plant two parallel rows 2 meters apart, staggered.
The tree is 2-3 meters apart in the row.
5-7 meters away from the innermost row of coffee — so as not to shade the edge coffee too much.
Direction perpendicular to the main wind (Northeast Lao wind in December-March).

Tall shade trees in the orchard

Density: 50-100 trees per hectare depending on tree type and canopy width.
Distance 10-12 meters × 10-12 meters for wide canopy trees (durian, large avocado).
Distance 8-10 meters × 8-10 meters for smaller canopy trees (small avocado, jackfruit).
Staggered, not in even rows — creates uneven lighting, simulating a natural environment.

Planting calendar in order

Important: shade trees must be planted before or at the same time as coffee, not after:

Long-term shade trees (durian, avocado): plant 12-24 months in advance.
Fast growing tree (leucaena): planted at the same time as coffee.
Temporary shade trees for 1-2 years (tall legumes): planted at the same time, cut down after 2-3 years.

Managing the system in stages

Coffee year 1-2 (construction)

Baby coffee needs 50-70 percent shade — almost a dense canopy.
Intercrop 1.5-2 meter tall legumes around each coffee tree — for example, dragon beans and cat beans.
Temporary shade net for 3-6 months if needed.
High shade trees do not have enough canopy — additional temporary measures.

Coffee year 3-5 (transitioned to business)

Gradually reduce shading to 40-50 percent.
Remove temporary shade trees.
Prune the branches of tall shade trees once a year (at the end of the dry season).
Monitoring water competition between auxiliary plants and coffee.

Coffee business year 6 and up

Maintain 30-40 percent shading.
Prune auxiliary tree branches 1-2 times per year.
Replace old or sick auxiliary plants.
Evaluate effectiveness every 5 years — should you change the type of supporting plants?

Measuring shading

Simple method without a computer:

Spread a white cloth under the canopy of coffee trees in the midday sun.
Count the ratio of sunny area to shaded area.
Sun over 60 percent = shade under 40 percent (OK).
Less than 50 percent sun = more than 50 percent shade (too much).

More accurate way: use a light intensity meter (abbreviated English name as lux meter). Compare the light under the canopy with the light in the open space.

Handling when auxiliary plants are counterproductive

Canopy too thick: prune strongly, reduce canopy by 30-40 percent. Prune from the top down.
Water-fighting roots (leucaena in the dry season): dig a trench to cut the roots 50 centimeters deep around the base of the supporting tree.
Leafs fall during the dry season: creates good mulch, but can also increase coffee root fungus. Sweep leaves away from the base.
Pests and diseases on auxiliary plants spread to coffee: Acacia trees and coffee trees have some diseases in common. Monitor and handle immediately.

Monitor and evaluate

[ ] Shade coverage every 6 months — measured by spreading a white cloth.
[ ] The condition of the coffee tree — are the leaves burning, how are the branches feeding the fruit?
[ ] Wind speed in the orchard compared to outside — observe the shaking of branches and leaves.
[ ] Supporting plant strength — pests, diseases, growth.

Common mistakes

Planting auxiliary plants at the same time as coffee without temporary shade: young coffee leaves burn in the first year.

Growing leucaena for orchards in severely dry areas: leucaena competes for water with coffee in the dry season.

Pruning auxiliary plants too much because you're worried about "too much shade": too strong light, burns coffee leaves, reduces productivity.

Unpruning every year: uncontrolled canopy growth of supporting trees, excessive shading.

Planting auxiliary plants in rows too tight: uniform light, coffee flowers do not bloom at the same time.

Take notes

Type of auxiliary plants, density, planting date.
Shade measured annually.
Pruning: date, amount of pruning.
Coffee yield compared to orchard without auxiliary trees (if there is a chance to compare).

References

*Auxiliary tree system in coffee farming* — Central Highlands Agricultural and Forestry Science and Technology Institute (abbreviated name WASI), 2020.
*Handbook for growing coffee under forest canopy* — Department of Crop Production, 2023.