Instructions for preparing soil for dragon fruit

Soil preparation determines the survival rate and health of the dragon fruit orchard in the first 2 years. Instructions on soil selection, drainage, mounding, soil treatment, fertilizing and erecting pillars before planting cuttings for the new orchard.

Summary: Dragon fruit tolerates drying quite well but is very afraid of prolonged waterlogging in the root area. Many orchards fail not because of poor varieties but because of squashy soil, low soil, weak drainage ditches or unripe manure. This article guides soil preparation in the following order: choosing location, drainage design, soil treatment, erecting pillars, fertilizing and checking before planting cuttings.

Applies to: New or reconstructed dragon fruit orchards in Binh Thuan, Long An, Tien Giang, Tay Ninh, Vinh Long.
Duration: Prepare 30-60 days before planting.
Difficulty level: Basic but affects the entire orchard life cycle.
Estimated additional costs: 60-120 million VND per hectare for land preparation, ditches/pits, posts and initial fertilization.

Dragon fruit

Dragon fruit has shallow roots, most of the roots work in the top layer of soil. Good soil for dragon fruit needs:

Fast drainage after rain.
Loose, not compacted around the base.
slightly acidic to neutral pH, about 5.5-6.5 is easy to manage.
Contains organic, helps retain moisture in the dry season and nourishes soil microorganisms.
Not salty, not heavy alum if no improvement measures have been taken.

Binh Thuan region is often strong in drainage but lacks organic matter and water in the dry season. The Mekong Delta region is richer in alluvium, but must be well built and ditched to avoid waterlogging.

Check the soil before orcharding

Check drainage

Dig a hole 40-50 centimeters deep, fill it with water and observe:

Water recedes within a few hours: soil drains well.
Water remains stagnant for days: need to raise to a higher level or dig a deeper ditch.
Soil smells sour, black, squashy: need to dry the soil, apply lime and improve organically first.

Check the farming floor

Top soil thickness over 30 centimeters: favorable.
Soil with shallow hard clay layer: prone to local waterlogging, needs to be broken up and leveled.
Light sandy soil: drains quickly but retains water poorly, needs organic supplementation.

Check old disease sources

If it is a replanted orchard or has grown diseased plants:

Clean up old roots, stumps, and diseased plant residue.
Do not plant immediately after destroying a orchard with severe disease.
Let the soil dry for 30-45 days if conditions allow.
Use lime and decomposed organic matter to reduce fungal pressure in the soil.

Design of ditches, rims and row directions

High, dry land

In Binh Thuan, Ninh Thuan or mound land:

Prioritize moisturizing, mulching, and drip irrigation.
The planting area does not need to be too high, to avoid causing the water to drain too quickly.
The row direction should be convenient for irrigation and harvesting.

Low land, easily flooded

In Long An, Tien Giang, Vinh Long:

Speed up 30-50 centimeters high; Deep floods may require 60-80 centimeters.
Ditches must be interconnected and have a main exit point.
Do not let water stand around the base for more than 24 hours after heavy rain.

Row direction

Straight rows make it easier to water, wire, spray and harvest.
Common distance: 3 x 3 meters or 3 x 3.2 meters depending on soil and variety.
Leave a path wide enough for a tractor or harvester.

Decided density is very difficult to fix, so it needs to be fixed at the same time as the raceway/lip design.

Soil treatment before planting

Clearing the premises

Clear large grass, shrubs, and old tree stumps.
Collect plastic trash, wire, and hard objects in the ground.
Plow or till locally around the pillar position.

Apply lime

Lime application helps slightly lower alum, reduce pathogens and improve pH:

Normal soil: 0.5-1 ton of lime per hectare.
Slightly acidic/alum soil: 1-2 tons per hectare, divided equally and mixed with soil.
Apply organic fertilizer 15-20 days before, do not mix lime directly with new manure.

Actual dose should be based on soil pH. If possible, take a soil sample to check before working.

Dry the ground

After plowing and lime application, the soil should be dried for 2-4 weeks:

Reduce pathogens in the soil.
Makes the soil looser.
Helps the toxic gas in the pumpkin soil escape.

Do not plant cuttings right on newly dug and fertilized soil, especially when the organic fertilizer is not yet ripe.

Prepare the hole and fertilize

Pit size

Each pillar prepares the pit area around the pillar:

Diameter 50-60 centimeters.
30-40 centimeters deep.
Mix topsoil with fertilizer, do not use all the deep soil to cover around the cuttings.

Reference fertilizer formula

Each pillar:

Organic waste: 5-10 kilograms.
Fused phosphate or super phosphate: 200-300 grams.
Lime: 200-500 grams if the soil is acidic.
*Trichoderma*: 50-100 grams, mixed with organic matter.

Mix well, cover and leave for 15-30 days before planting. Organic fertilizer must be thoroughly decomposed, no longer hot and no longer smelly.

Build posts before planting

Concrete pillar

1.7-1.8 meters high above ground.
Bury 30-40 centimeters deep.
The pillar head has a support frame or canopy support wheels.
The post must be strong before tying the cuttings.

Living pillar

Living poles are more suitable for ecological orchards but need to be prepared early:

Plant 1-2 years in advance to make the tree strong enough.
Choose species that have little competition for water and do not have strong roots.
It is necessary to prune the canopy to not cover the dragon fruit too much.

Current commercial orchards often choose concrete pillars because they are easy to manage and uniform.

Check before going down to the cutting

Before planting day, check again:

[ ] The drainage ditch is clear and not clogged.
[ ] The location of the pillar does not stagnate water after rain.
[ ] The fertilizer has become stale and cold.
[ ] The soil around the hole is moist enough but not soggy.
[ ] The pillar stands firmly, not tilting.
[ ] Soft tie-down straps, extra stakes and shade material are available if needed.

If the soil is still too wet or the compost is still hot, wait more. Planting a few days late is better than losing mass cuttings.

The first 30 days after planting

Preparing good soil is not enough, you still have to follow closely in the first month:

Water lightly and evenly; Do not overwater.
Temporary shade if planted in hot sun.
Tie the cuttings close to the post but do not tighten.
Check the roots after heavy rain, cover if the soil is washed away.
Pick cuttings that die early so that the orchard has an even age.

Do not fertilize with strong chemical fertilizers in the first month. New roots are still weak and susceptible to shock.

Common mistakes

Low level in flood-prone areas: the tree survives in the first season but gradually declines because the roots lack oxygen.

Using unrotten manure: heats the roots, increases fungus and causes cuttings to rot.

Do not dry orchard soil for replanting: old pathogens are still present, new plants can easily die locally.

Plant first, build ditches later: if you encounter heavy rain, you won't have time to escape, causing heavy damage.

Only count the number of pillars, not the path: later it will be difficult to harvest, difficult to spray and difficult to draw electricity for lighting.