RUBBER NEWS

Designing Replanting Plots and Rubber Tree Cultivation Techniques

Posted on by content02.vinahugo
13
Oct

Designing replanting plots and applying proper rubber tree cultivation techniques are the most important initial steps to establish a productive and sustainable rubber plantation.
All technical standards are regulated under the 2020 Rubber Technical Guidelines issued by the Vietnam Rubber Group (VRG).

1. Key Standards for Rubber Replanting

  • Select rubber varieties suitable for the local climate and soil conditions.

  • Ensure the plantation achieves over 90% of the designed density and at least 70% of trees meet tapping standards after the immature period.

2. Plot Design for Rubber Plantations

On Flat Land

Design criteria:

  • Planting density: 500–600 trees/ha

  • Row spacing: 6–8 m

  • Tree spacing: 2.5–3 m

  • Row direction: North–South (or East–West in storm-prone regions).

Common layouts:

  • 6 m × 3 m = 555 trees/ha

  • 7 m × 2.5 m = 571 trees/ha

Avoid planting at densities higher or lower than these standards, as it may negatively affect tree growth and latex yield.

High-efficiency double-row designs (allowing intercropping):

Layout (m) Trees/ha Notes
10 × 5 × 2.5 533 Double rows 10 m apart
10 × 6 × 2.5 500 Single rows 6 m apart
12 × 6 × 2 555 Suitable for mechanized farming
14 × 5 × 2 526 Optimized for intercropping
15 × 5 × 2 500 Long-term sustainable spacing

On Sloped Land (<30°)

  • For slopes <15°: 7 m × 2.5 m (571 trees/ha)

  • For slopes >15°: 8 m × 2.5 m (500 trees/ha)

  • Adjust row spacing ±1 m and tree spacing ±0.5 m depending on terrain.

3. Duration of the Immature Phase (Establishment Period)

The immature period (KTCB) is the time for investment and care before tapping begins.
It directly determines future latex productivity and economic returns.

Region Soil Class Immature Period
Southeast Vietnam Class I: 6–7 yrs, Class II: 7–8 yrs, Class III: 8–9 yrs
Central Highlands (<600m), Cambodia, S. Laos, Bình Thuận Class II: 7–8 yrs, Class III: 8–9 yrs
North, Central Coast, Highlands >600m, Central Laos Class II: 8–9 yrs, Class III: 9–10 yrs

4. First-Year Growth Standards

Measured during leaf-fall season (Nov–Dec):

  • Polybag or layered seedlings: ≥98% survival; ≥80% with ≥4 leaf whorls.

  • Budded stump with 4–5 leaf whorls: ≥98% survival; ≥80% reach ≥2 m height.

  • Bare stumps: ≥95% survival; ≥80% with ≥3 leaf whorls.

By the end of the immature phase, at least 70% of trees must reach tapping girth, with ≥90% effective densitymaintained.

5. Land Preparation and Fertilization

  • Planting hole: 60 × 60 × 60 cm (bottom 50 × 50 cm).

  • Base fertilizer per hole:

    • 300 g fused phosphate

    • 5–10 kg organic compost or bio-fertilizer

  • Fill half the hole with topsoil, mix fertilizers thoroughly, refill, and plant after 15 days.

6. Recommended Planting Seasons

Region Optimal Planting Period
Southeast, Bình Thuận, Central Highlands, Northwest, Laos, Cambodia May 15 – Aug 15
North Central & Northeast Feb 1 – Apr 15
South Central Coast (Huế–Ninh Thuận) Sept 15 – Nov 30

Replanting or filling gaps should be completed within one month after the main planting season.

7. Rubber Seedling Standards

  • Budded stump: Diameter ≥15 mm (direct planting) or ≥12 mm (polybag use).
    Roots must be straight, grafts healthy, and stumps planted within 7 days after uprooting.

  • Polybag seedlings: 1–2 stable leaf whorls, healthy, no disease, no root damage.

8. Rubber Planting Techniques

a. Budded Stumps

  • Avoid stump planting in cold-sensitive regions (North Central, Northern mountains).

  • Insert vertically with graft facing the main wind direction.

  • Soil level should reach just below the graft union.

  • Compact soil gently around roots to avoid air gaps.

b. Polybag Seedlings

  • Cut the bottom of the bag carefully without damaging roots.

  • Place upright, remove bag gradually while filling soil and pressing lightly.

  • For hilly areas: plant 5 cm deeper to prevent erosion and root exposure.

9. Replanting (Gap Filling)

  • Conduct within the first or second year using seedlings of the same clone and similar growth.

  • Keep 10–25% of total seedlings ready for replanting (depending on planting method).

  • Replace dead or weak trees within 20–60 days after planting.

10. Drainage and Anti-Waterlogging Design

A proper drainage system prevents waterlogging and soil erosion.

Design principles:

  • Utilize natural streams and low-lying areas for main drains.

  • The main drain (T1) should connect to external waterways for natural outflow.

  • Smaller drains (T2, T3, T4) feed into larger ones, ensuring water flows by gravity.

Drain Type Depth (m) Width (m) Max Length (m) Max Spacing (m)
T1 1.2 1.2 — —
T2 0.9–1.1 0.9–1.1 1000 1000
T3 0.8–1.0 0.8–1.0 1000 500
T4 0.7–0.9 0.7–0.9 Along rows Every 5–10 rows

Source: VRG Rubber Technical Manual – 2012

Conclusion

The design and replanting of new rubber plots are foundational steps to ensure long-term productivity and sustainability.
Following the official VRG standards for spacing, planting techniques, and drainage design will help farmers and investors maximize latex yield and shorten the immature phase, ensuring economic efficiency and environmental balance.