Mucuna bracteata vs Pueraria javanica: seeding rates, ordering and cost
Mucuna bracteata vs Pueraria javanica: seeding rates, ordering and cost
The buying-side comparison: how much seed each species actually needs per hectare, what each costs to get into the ground, and how to avoid the ordering error that puts Mucuna quantities out by a factor of forty.
Before you order Mucuna: MB is not broadcast. It is raised in a nursery and transplanted at roughly 320 seedlings per hectare, which takes about 85 to 100 grams of seed per hectare. Figures of 4 to 6 kg/ha that you may see elsewhere describe direct seeding on mineral soil, which is a different operation entirely. Ordering against the wrong figure will put your quantity out by a factor of forty or more. If you are not certain which applies to your block, ask us before you order.
Head-to-head: seed, labour and cost
| Factor | Mucuna bracteata (MB) | Pueraria javanica (PJ) |
|---|---|---|
| Botanical family | Fabaceae (Leguminosae) | Fabaceae (Leguminosae) |
| Growth habit | Vigorous climbing vine | Twining, trailing vine |
| Establishment method | Nursery-raised, transplanted at about 320 seedlings/ha. Never broadcast | Direct broadcast |
| Seed quantity to order | 85 to 100 g/ha of seed, for roughly 320 nursery-raised seedlings per hectare | 4 to 6 kg/ha in a pure stand; 2 to 4 kg/ha as part of a legume mixture |
| Seed preparation | Hard seed coat and pronounced dormancy. Scarification before sowing is essential; raise in polybags and transplant at four to six weeks | No scarification needed for normal broadcast use. Prepare the seedbed and broadcast in one pass |
| Cost profile | Very little seed per hectare, so seed cost is low. Nursery raising and transplanting add the real cost, in labour | Much more seed per hectare, so seed cost dominates. Establishment labour is minimal |
| Nitrogen fixation | 67 to 84% of its nitrogen taken from the air, measured by 15N isotope dilution under three-year-old oil palm on Jawa Series soil in Malaysia (Cheah et al. 2010). Absolute kg/ha figures vary widely by method | 85 to 93% of its nitrogen from the air, with up to 250 kg N/ha/yr accumulated in aboveground biomass in one rubber-intercrop trial in northeast Thailand (Clermont-Dauphin et al. 2016). Treat that as a measured upper reference point from a single trial, not a design value; published figures vary widely with site, stand age and management |
| Biomass | 7.7 to 24.5 t/ha/yr harvested, depending on cutting frequency (24-month Malaysian trial) | About 8 t/ha/yr (4-year Thai rubber trial) |
| Shade tolerance | Moderate to high. The more shade-tolerant of the two, which is why it is the species used under maturing oil palm. It still thins under a fully closed canopy | Low to moderate. Thins out earlier than MB as the canopy closes, so it is mainly a species for young, open plantings |
| Drought tolerance | Moderate to good once established | Moderate once established, but on shallow or light soils with low water-holding capacity the cover competes for water. See the note below |
| Time to full ground cover | About 6 months on mineral soil; markedly slower on peat | Faster to establish, but a legume mixture typically takes around 9 months to close |
| Weed suppression | Excellent once established, by smothering | Very good |
| Ongoing management | Vigorous. Needs pruning back from trunks | Lower maintenance |
Sources: Cheah et al. 2010, Oil Palm Bulletin 60 (MPOB); Clermont-Dauphin et al. 2016, Agriculture, Ecosystems and Environment 217:79-88; Mohd Noor et al. 2021, Pertanika Journal of Tropical Agricultural Science 44(1); Samedani et al. 2015, International Journal of Agriculture & Biology 17(2); Pipai et al. 2023, Plant and Soil 491.
What each one costs to establish
MB's seed cost per hectare is small because the quantity is tiny, but you pay for it in nursery work: polybags, potting medium, four to six weeks of nursery care and a transplanting round across the block. PJ inverts that. You buy kilograms rather than grams, so seed is the larger line item, but establishment is a single broadcast pass. On a large open block PJ is usually the cheaper species to get into the ground; on a block with severe Imperata cylindrica pressure, MB's labour is often worth paying for. Ask us for current lot pricing and germination test results before you budget, since seed price moves with harvest season and availability.
When to order Mucuna bracteata
Order MB when you are dealing with heavy Imperata cylindrica (cogon grass) infestation, need maximum biomass for building soil organic matter, have the labour capacity for polybag raising and trunk-circle maintenance, or want a cover that keeps going as the canopy develops, since MB holds on under shade longer than PJ does. Order in grams per hectare, not kilograms, and tell us the planted area so we can check the quantity with you.
When to order Pueraria javanica
Order PJ when you need straightforward establishment by broadcast seeding across a large open block, want the lower-cost, lower-labour option through the early years, or are working with coconut where the wider spacing and open canopy suit it. Order 4 to 6 kg/ha for a pure stand, or 2 to 4 kg/ha where PJ goes into a legume mixture.
One trade-off worth planning around. A four-year rubber trial in northeast Thailand (Clermont-Dauphin et al. 2016) found that Pueraria phaseoloides improved tree nutrition and growth where soil water storage was good, but at upper slope positions with low water-holding capacity the same cover reduced the young trees' ability to survive intense drought. On shallow or light soils, plan the cover to the soil rather than to the block. Verify nutrient contribution against your own soil and leaf analysis rather than assuming a fixed fertiliser credit.
Ordering both: the hybrid approach
Many experienced plantation managers buy both species. PJ is broadcast for quick, inexpensive cover across the open inter-rows, while MB goes into the blocks with the worst weed pressure during the first two to three years. As the canopy closes and shade increases, PJ thins out first; MB holds on longer, which is why it is the species carried through into maturing oil palm. Under a fully closed canopy both eventually thin, and shade-persistent species such as Centrosema pubescens (CP) and Calopogonium caeruleum (CC) take over as the long-term cover. Budget the two lines separately: grams of MB for the problem blocks, kilograms of PJ for the open area.
Frequently asked questions
How much Mucuna bracteata seed do I need per hectare?
About 85 to 100 grams of seed per hectare. That raises roughly 320 nursery seedlings, which are then transplanted. Mucuna bracteata is not broadcast in commercial practice, so per-hectare rates quoted in kilograms do not apply to this species in a plantation setting.
How much Pueraria javanica seed do I need per hectare?
4 to 6 kg per hectare for a pure stand, broadcast directly. Where PJ goes into a legume mixture with other species, 2 to 4 kg per hectare is typical. Unlike Mucuna bracteata, PJ is ordered and sown in kilograms.
Is Mucuna bracteata hard to establish from seed?
It has a hard seed coat and pronounced dormancy, so it needs scarification before sowing. A 2024 review reports untreated germination of 53% against 93% after scarification. Growers raise MB in polybags and transplant seedlings at four to six weeks. That adds labour compared with PJ, which is broadcast directly. We supply scarification guidance with the seed.
Will Mucuna bracteata climb and damage my palms?
MB is a vigorous climber and will climb young palms if left alone. Keep a clear circle of 1.5 to 2 m radius around each trunk and prune runners that reach it. Expect this as a regular task for the first three to five years, until the canopy shades out growth near the trunk.
Can I mix MB and PJ seeds together for broadcasting?
No. They cannot go into the same broadcast pass, because MB is not broadcast at all. Establish MB from nursery seedlings in the problem areas first, then broadcast PJ across the rest of the block.
Which species is more available in the Philippines?
PJ has historically been more widely available. Kudzu Seeds Trading supplies both. Contact us for current availability, lot germination test results and pricing.
Explore the species: Mucuna bracteata (MB) and Pueraria javanica (PJ).
Still deciding which species to plant? Our companion page, PJ vs MB by crop system, gives a recommendation for oil palm on mineral soil and on peat, immature and replanted rubber, and coconut basins.