Cover Crop Seeds | Pueraria javanica (PJ)
Quick Facts
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PLANT CHARACTER
Fast-growing, trailing to twining annual/short-lived perennial legume. Forms a dense, self-regenerating ground cover under plantation canopies. Deep root system contributes to subsoil moisture access and nutrient cycling.
USES
Nitrogen fixation, erosion control, soil moisture retention, potassium cycling, weed suppression, and cover crop for replanting phases. In immature rubber, field research confirms Pueraria javanica fixes approximately 250 kg of nitrogen per hectare per year — with 85–93% of that nitrogen drawn directly from the atmosphere. In replanted rubber, a legume cover including Pueraria reduced runoff by 88% and soil loss by 98% versus bare soil (Perron et al., 2024). For optimal germination results, pair with Seed Activator during planting. See also: PJ vs MB Comparison.
GROWTH HABIT
Vigorous establishment under full sun and moderate shade. Produces 14,347 kg of fresh biomass per hectare at 150 days in Philippine plantation trials. Biomass decomposes at 95.66% within 3 months, releasing 3.572% N, 0.245% P, and 0.809% K directly into the root zone.
COCONUT & MULTI-CROP USE
Established as a basin legume in coconut, Pueraria javanica contributes 28.45 kg of biomass and 196.2 g of nitrogen per basin — and can substitute up to 30% of nitrogen fertiliser requirements (Indian Coconut Journal, 2022).
PLANTING TYPE & SEEDING RATE
Monoculture or mixture: 2–4 kg/ha
PLANTING METHOD
Direct sowing — broadcast or rows
DRY MATTER PRODUCTION
8–12 t/ha/year
NO. OF SEEDS/KG
~55,000 seeds
SUPPLIED BY CHEMISEED SDN. BHD.
Pueraria javanica seeds are supplied by Chemiseed Sdn. Bhd., a Malaysian tropical agriculture company specializing in cover crop seeds, soil conditioners, and plantation inputs. Chemiseed is a trusted supplier of leguminous cover crop seeds across the tropics.
GLOBAL AVAILABILITY — TROPICAL REGIONS WORLDWIDE
Chemiseed Sdn. Bhd. exports Pueraria javanica seeds to plantations, agricultural cooperatives, government agencies, and distributors across Southeast Asia (Malaysia, Indonesia, Thailand, Vietnam, Myanmar, Cambodia, Philippines), Latin America (Brazil, Colombia, Ecuador, Costa Rica, Guatemala, Honduras, Peru), Sub-Saharan Africa (Ghana, Nigeria, Cameroon, Ivory Coast, Tanzania, Kenya, Mozambique, Uganda), South Asia (India, Sri Lanka, Bangladesh), and Oceania (Papua New Guinea, Solomon Islands, Fiji). All seed shipments comply with international phytosanitary certification and trade compliance standards. Contact Chemiseed Sdn. Bhd. for bulk seed supply, distributor partnerships, and international delivery.
Related Resources
- Cover Crop Comparison: PJ, CM, CP, MB
- PJ vs MB Detailed Comparison
- Complete Guide to Pueraria javanica
- Best Cover Crop for Oil Palm
- Best Cover Crop for Rubber
- Cover Crop Calculator
- Frequently Asked Questions
- Seed Activator — Boost Germination
By the numbers
Data from peer-reviewed trials across Malaysia, Indonesia, and the Philippines (rubber, coconut, and replanting systems).
All statistics from peer-reviewed or institutional research. Seeds supplied by Chemiseed Sdn. Bhd. — available for export worldwide. View Perron et al. 2024 erosion study
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How to Order
Trial / Retail: Order directly from this page at the listed price. Suitable for small-scale trials and individual purchases.
Bulk / Estate: For plantation-scale orders (100 kg+), request a bulk quote with volume discounts.
Export / International: We ship globally. Contact us for CIF/FOB pricing and export documentation.
Marketplace: Also available on Shopee Malaysia.
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What is Pueraria javanica (PJ) and who is it for?
Pueraria javanica is a vigorous creeping and twining perennial legume widely used as a cover crop in rubber, coconut, and oil palm plantations. It fixes approximately 250 kg N/ha/yr with 85 to 93 percent of nitrogen derived from atmosphere (Vrignon-Brenas review), produces roughly 8 Mg/ha/yr aboveground biomass in immature rubber, and has been shown to reduce runoff by up to 88 percent on slopes (Perron 2024). PJ performs well on acidic tropical soils down to pH 3.5 but is not a drought specialist and is best suited for regions with reliable rainfall.
Quick facts: Pueraria javanica (PJ)
| Scientific name | Pueraria phaseoloides (syn. P. javanica) |
|---|---|
| Growth habit | Vigorous creeping/twining perennial legume |
| Seeding rate | 4-6 kg/ha (monoculture), 2-3 kg/ha (mixture) |
| Soil pH range | 3.5 - 6.0 |
| Shade tolerance | Moderate |
| Drought tolerance | Low to moderate (not a drought specialist) |
| N fixation | ~250 kg N/ha/yr, 85-93% Ndfa |
| Biomass production | ~8 Mg/ha/yr aboveground in immature rubber |
| Establishment speed | Moderate to slow (seed dormancy requires scarification) |
Where does Pueraria javanica (PJ) work best?
Best for
- Immature rubber plantations
- Coconut systems and coconut basin management
- Erosion-prone slopes (88% runoff reduction documented)
- Acidic tropical soils (tolerates pH as low as 3.5)
- Legume cover crop mixtures
Not ideal for
- Prolonged dry seasons or drought-prone regions
- Mature shaded canopy without companion species (CC or CP)
- Areas where rapid initial cover is critical (CM is faster)
What Pueraria javanica (PJ) will not do
PJ does not increase latex yield in rubber. There is no published evidence supporting a direct latex yield improvement from PJ cover. PJ does not prevent Tapping Panel Dryness. For coconut yield claims, the comparator matters: yield improvements are relative to bare-soil or unmanaged basins, not to other cover crop systems. Seed dormancy requires scarification for acceptable germination rates (untreated seed germinates at only 7-16% versus 73-91% with H2SO4 scarification).
How to establish and use Pueraria javanica (PJ)
Sow at 4 to 6 kg/ha for monoculture or 2 to 3 kg/ha when used in a legume mixture. Seed scarification is essential: untreated seed germinates at only 7 to 16 percent, compared to 73 to 91 percent with acid scarification. In coconut systems, follow the Thomas and Shantaram 1993 protocol for basin establishment. For erosion control on slopes, PJ can be combined with CM for fast initial cover followed by PJ persistence.
What does the research say about Pueraria javanica (PJ)?
- Vrignon-Brenas review documents N fixation of ~250 kg N/ha/yr with 85-93% Ndfa.
- Perron 2024 demonstrates 88% runoff reduction on slopes with PJ cover.
- Thomas and Shantaram 1993 provides the coconut basin cover crop protocol.
- Sri Lanka coconut yield research shows yield response relative to bare-soil comparator.
- Biomass data (~8 Mg/ha/yr) from immature rubber system studies.
Frequently asked questions about Pueraria javanica (PJ)
What is the recommended seeding rate for Pueraria javanica?
For monoculture establishment, use 4 to 6 kg/ha. When PJ is part of a legume mixture (commonly with CM and CP), reduce to 2 to 3 kg/ha. Scarified seed is strongly recommended for acceptable germination rates.
Does Pueraria javanica increase rubber latex yield?
There is no published evidence that PJ directly increases rubber latex yield. The documented benefits in rubber systems are soil nitrogen enrichment, weed suppression, and erosion reduction. PJ also does not prevent Tapping Panel Dryness.
Why is seed scarification important for PJ?
Untreated PJ seed has a germination rate of only 7 to 16 percent due to hard-seed dormancy. Acid scarification (H2SO4) increases germination to 73 to 91 percent. Without scarification, establishment will be poor and uneven.
How does Pueraria javanica perform in coconut systems?
PJ is used as a basin cover crop in coconut systems following the Thomas and Shantaram 1993 protocol. Yield improvements have been documented in Sri Lanka, but these are relative to bare-soil or unmanaged basins rather than to other cover crop systems.
What is PJ's role in erosion control?
Perron 2024 documented an 88 percent reduction in runoff on slopes with PJ cover. PJ's dense root system and surface biomass stabilize soil, making it one of the stronger erosion-control legumes for tropical slopes.
What to include in your inquiry
To help us provide accurate pricing and recommendations for Pueraria javanica (PJ), please include the following information when you contact us:
- Your plantation crop (rubber, coconut, oil palm)
- Soil type and approximate pH
- Annual rainfall and dry season length
- Terrain (flat, sloped)
- Planting area in hectares
- Whether you need scarified or untreated seed
- Your location (state/region in Malaysia)
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Chemiseed Sdn. Bhd.
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