Pueraria javanica (PJ) vs Mucuna bracteata (MB): which cover crop fits your plantation?

Pueraria javanica (PJ) vs Mucuna bracteata (MB): which cover crop fits your plantation?

A side-by-side comparison based on published field evidence, by Chemiseed Sdn. Bhd.

Pueraria javanica (PJ) cover crop seeds, a tropical legume for rubber and coconut plantationsMucuna bracteata (MB) cover crop seeds, a legume cover widely used in oil palm plantations
Short answer: Both PJ and MB are high-performing tropical legume cover crops, but they serve different roles. MB is the stronger choice for young oil palm on mineral soils and on peat, where its vigorous growth delivers fast ground cover and weed suppression, and where its shade tolerance lets it carry the cover on as the canopy matures; it demands active palm-circle maintenance and is transplanted from a nursery rather than broadcast. PJ is better suited to immature rubber inter-rows, coconut basins, and systems where a moderate growth habit and easier management are priorities, but PJ thins as the canopy closes. The right choice depends on your crop system, canopy stage, and management capacity.

Head-to-head comparison

Attribute Mucuna bracteata (MB) Pueraria javanica (PJ)
Nitrogen fixation 67 to 84% Ndfa in oil palm by 15N isotope dilution (Cheah, Zaharah & Aminuddin 2010, MPOB Oil Palm Bulletin 60). A proportion, not a quantity: no defensible absolute kg N/ha figure exists for MB, and we do not publish one. Up to 250 kg N/ha/yr accumulated in aboveground biomass at 85 to 93% Ndfa in one rubber-intercrop trial in NE Thailand (Clermont-Dauphin et al. 2016). A measured upper reference point from a single site, not a design value.
Biomass production High, vigorous climbing growth; we do not publish a dry-matter figure for MB About 8 Mg/ha/yr aboveground in immature rubber (Clermont-Dauphin et al. 2016); 5 to 10 t DM/ha in pure stands (Tropical Forages)
Establishment Nursery-raised and transplanted: 320 seedlings/ha on deep peat (MPOB TT No. 501) or 680 seedlings/ha on mineral soil (Samedani et al. 2015). Never broadcast; MB is not ordered by the kilogram per hectare. Broadcast at about 4 kg/ha as a pure stand, or 5 to 7.5 kg/ha with 1 to 1.5 kg/ha of CC (Tropical Forages)
Erosion control Improved soil physical properties and lower runoff and erosion on three slope classes in 3-year-old oil palm in Riau, Indonesia (Wawan, Dini and Hapsoh 2019; small plots, two replicates) Up to 88% less runoff and 98% less soil loss than bare soil where Pueraria was combined with logging residues in young replanted rubber, Côte d'Ivoire, on 1 m² plots (Perron et al. 2024)
Drought tolerance Good resilience once established Not a drought-specialist species. In the NE Thailand trial the PJ cover reduced the drought resilience of the young rubber trees on water-limited ground, so on drought-prone sites it needs managing back from the planting rows.
Shade tolerance The shade-tolerant one. This is why MB is used under maturing oil palm. Biomass falls under full canopy closure. Moderate while the canopy is open. PJ thins as the canopy closes, so a shade-persistent successor (CP or CC) should be established before closure.
Soil acidity Performs on acidic tropical soils Tolerates acidic soils and temporary waterlogging
Management demand High, vigorous, can smother and entangle young palms without active circle maintenance Moderate, less aggressive growth, easier to manage around young trees
Weed suppression Strong; the dense canopy shades out weeds such as Imperata cylindrica and Mikania micrantha Good ground cover but less aggressive than MB
Best primary system Young immature oil palm on mineral soils, and oil palm on peat (320 seedlings/ha, MPOB TT No. 501); carries cover into the maturing canopy Immature rubber inter-rows; coconut basins; mixed legume covers on open ground

System-specific recommendations

Young oil palm (mineral soil)

Choose MB. MB is widely used in young immature oil palm for weed suppression and nutrient recycling; in one mineral-soil trial it reached about 100% ground cover at 6 months at 680 seedlings/ha (Samedani et al. 2015). Requires active palm-circle management to prevent smothering.

Oil palm on peat

Choose MB. MPOB TT No. 501 describes MB as a ground cover on deep peat at 320 seedlings/ha, two per palm point, raised from about 500 seeds (75 g); cover reached 31% at 6 months and 78% at 24 months.

Immature rubber

Choose PJ. In one four-year NE Thailand trial the PJ cover accumulated up to 250 kg N/ha/yr in aboveground biomass at 85 to 93% Ndfa from about 8 Mg/ha/yr of biomass, and 39 to 46% of the rubber trees' leaf nitrogen traced back to the legume (Clermont-Dauphin et al. 2016). That is one site, so treat it as an upper reference point. The same trial found reduced drought resilience in the young rubber on water-limited ground. PJ is less aggressive than MB, so it is easier to manage around young rubber.

Replanted rubber on slopes

Choose PJ. In young replanted rubber in Côte d'Ivoire, Pueraria combined with logging residues gave up to 88% less runoff and 98% less soil loss than bare soil on 1 m² plots (Perron et al. 2024). PJ's moderate habit suits slope management.

Maturing canopy

Plan the handover. PJ thins as light at ground level falls. MB tolerates shade and carries heavy biomass through the maturing phase; Centrosema pubescens and Calopogonium caeruleum are the shade-persistent successors and must be established before closure, not after.

Coconut basins

Choose PJ. In one farmer's garden on laterite soil in Kerala, India, PJ sown at 25 g of seed per basin (1.8 m radius) gave 28.45 kg of fresh biomass and 196.2 g of shoot N per basin when the tops were harvested 120 days after sowing (Thomas and Shantaram 1993, CORD 9(1): 34).

What this comparison does not cover

Important limitations

This comparison focuses on soil-system benefits: nitrogen fixation, erosion control, ground cover, and weed suppression. It does not make crop-yield promises.

MB has not been shown to "always increase FFB yield", that claim is not supported by consistent multi-site evidence. PJ has not been shown to increase rubber latex yield, shorten time to first tapping, or prevent Tapping Panel Dryness, those claims lack clean field-trial support. We will not put a percentage on fertiliser savings for either species.

Cover-crop performance varies by soil type, rainfall, management intensity, planting density, and canopy stage. The data cited here comes from specific field contexts and may not transfer directly to all sites.

Evidence sources

  • Cheah, S.S., Zaharah, A.R. & Aminuddin, H. (2010), MPOB Oil Palm Bulletin 60: 15N isotope-dilution study documenting 67 to 84% Ndfa for MB in oil palm
  • Clermont-Dauphin, C. et al. (2016), Agriculture, Ecosystems & Environment 217:79-88: up to 250 kg N/ha/yr accumulated in aboveground biomass, 85 to 93% Ndfa, about 8 Mg/ha/yr biomass and 39 to 46% of rubber leaf N for PJ in immature rubber, northeast Thailand; also reduced drought resilience of the young rubber on water-limited ground.
  • Wawan, Dini, I.R. & Hapsoh (2019), IOP Conference Series: Earth and Environmental Science 250: 012021: MB effects on soil physical properties, runoff and erosion on three slopes of immature oil palm, Riau, Indonesia
  • Perron, T. et al. (2024), Science of the Total Environment 913: 169335: up to 88% less runoff and 98% less soil loss with Pueraria plus logging residues in young rubber, Côte d'Ivoire, 1 m² plots
  • Thomas, G.V. & Shantaram, M.V. (1993), CORD 9(1): 34: PJ biomass and shoot N in coconut basins, laterite soil, Kerala
  • MPOB peat BMP (TT No. 501 / Information Series 588, June 2012): 320 seedlings/ha on deep peat (31% cover at 6 months, 78% at 24 months), and the conventional LCC mixture PJ 4 : CP 3 : CC 1, total 8 kg/ha with 5 g Rhizobium per kg seed
  • Samedani, B. et al. (2015), International Journal of Agriculture and Biology 17(2): 251-260: MB at 680 seedlings/ha on mineral soil, about 100% ground cover at 6 months
  • Tropical Forages (CIAT and ILRI): PJ seeding rates and pure-stand dry matter

Frequently asked questions

Can I use MB and PJ together in the same plantation?
Yes. Some plantation managers use MB in open, high-sun areas for rapid ground cover and PJ in inter-rows or partially shaded areas. The key is matching species to canopy stage and management capacity. MB's vigorous growth requires more active maintenance than PJ, and MB is transplanted from a nursery while PJ is broadcast.
Which species is easier to establish?
PJ is generally easier to establish and manage, and it is broadcast at about 4 kg/ha (Tropical Forages). MB is more vigorous once established but has to be raised in a nursery and transplanted (published plantings are 320 to 680 seedlings per hectare), and it requires active circle maintenance in young plantations to prevent smothering of crop plants. Both benefit from proper seedbed preparation and adequate moisture at planting.
Which species handles shade better?
MB. It is the shade-tolerant species of the plantation legume covers, which is why it is used under maturing oil palm. PJ thins as the canopy closes. Under a fully closed canopy, Centrosema pubescens and Calopogonium caeruleum are the shade-persistent successors for both.
Does MB or PJ fix more nitrogen?
We cannot answer that honestly, because the two measurements are not comparable. MB's figure is a proportion: 67 to 84% of its nitrogen drawn from the atmosphere in oil palm (Cheah, Zaharah & Aminuddin 2010). PJ's is a quantity accumulated in biomass on one site: up to 250 kg N/ha/yr at 85 to 93% Ndfa in immature rubber in northeast Thailand (Clermont-Dauphin et al. 2016). Different crops, different methods, different units. Both are strong fixers; the practical difference depends on your crop system, canopy stage, and how much biomass the cover actually grows.
Will either species increase my crop yield?
Neither species has consistent multi-site evidence for direct crop-yield increases. Cover crops improve soil system health, nitrogen cycling, erosion control, moisture retention, organic matter, which supports long-term productivity. But attributing specific yield numbers to a single cover crop input would overstate the evidence.

Need help choosing the right cover crop for your plantation?

Contact Chemiseed Sdn. Bhd. for species recommendations matched to your crop system, country or region, and planting conditions. Request a recommendation and quotation.

WhatsApp: +60 17-237 4058

View Mucuna bracteata (MB) seeds | View Pueraria javanica (PJ) seeds