Cover crop comparison: Mucuna bracteata vs Pueraria javanica vs Calopogonium mucunoides vs Centrosema pubescens vs Calopogonium caeruleum
Which legume cover crop is right for your plantation?
There is no single best cover crop for all plantation systems. The right species depends on your crop, canopy stage, soil type, rainfall pattern, and management capacity. This comparison covers five widely used legume cover crops in Southeast Asian plantations: Mucuna bracteata (MB), Pueraria javanica (PJ), Calopogonium mucunoides (CM), Centrosema pubescens (CP), and Calopogonium caeruleum (CC). Each species has documented strengths and clear limitations.
Request a quotation for MB, PJ, CM, CP or CC seed.
Side-by-side comparison table
| Attribute | MB | PJ | CM | CP | CC |
|---|---|---|---|---|---|
| Growth habit | Vigorous climber/creeper | Vigorous creeper/twiner | Creeper/twiner | Twining perennial | Creeping perennial |
| N fixation | 67 to 84% Ndfa (Cheah et al. 2010, MPOB Oil Palm Bulletin 60: 15N isotope dilution, three-year-old oil palm, Jawa Series soil, Malaysia) | 85 to 93% Ndfa. Up to 250 kg N/ha/yr accumulated in aboveground biomass in a single trial under young rubber in northeast Thailand (Clermont-Dauphin et al. 2016). This is a measured upper reference point under favourable conditions, not a design value: published figures vary widely with site, stand age, and management, and a thin or young stand fixes far less | No verified species-specific nitrogen figure is published | No verified species-specific nitrogen figure is published | No single species-specific annual fixation rate is currently published from verified evidence |
| Seeding rate | Transplanted, never broadcast: about 320 nursery-raised seedlings/ha, two per palm point, from about 500 seeds (75 g) on deep peat (MPOB TT No. 501); 680 seedlings/ha on mineral soil (Samedani et al. 2015) | About 4 kg/ha (Tropical Forages); 4 kg/ha in the MPOB TT No. 501 mixture | Set on the quotation for the site; not in the MPOB mixture | 3 to 5 kg/ha broadcast (Tropical Forages); 3 kg/ha in the MPOB mixture | 1 to 1.5 kg/ha with 5 to 7.5 kg/ha PJ (Tropical Forages); 1 kg/ha in the MPOB mixture |
| Soil acidity | Acid tropical soils | Acid soils; tolerates temporary waterlogging | Acid soils; tolerates flooding | Moderate acidity tolerance | Acid soils |
| Shade tolerance | Moderate-high. Tolerates partial shade, which is why it is carried under maturing oil palm; it still thins under a fully closed canopy | Low-moderate. Thins out as the canopy closes | Low-moderate. A light-demanding pioneer | High. Persists under a closed canopy | High. Persists under a closed canopy |
| Drought tolerance | High once established (Afandi et al. 2017, qualitative) | Low-moderate. In the Clermont-Dauphin et al. (2016) rubber trial the PJ cover reduced young rubber trees' drought resilience on the water-limited part of the slope | Low | Moderate | Moderate |
| Establishment speed | Depends on density: about 100% cover at 6 months at 680 seedlings/ha on mineral soil (Samedani et al. 2015); 78% at 24 months at 320 seedlings/ha on deep peat (MPOB TT No. 501) | Moderate-slow | Fast: covers the soil 3 to 6 months after sowing (PROSEA 11) | Moderate | Slow: about 20 months to full cover (PROSEA 4) |
| Best primary use | Young oil palm, peat BMP | Immature rubber, coconut basins | Pioneer/fast initial cover | Shade persistence in mature systems | Deep shade in mature rubber/cacao |
| Key limitation | Requires active palm-circle management | Seed dormancy; not drought-tolerant, and measured to reduce young rubber drought resilience on water-limited ground | Short-lived; thins out over time without reseeding | Seed dormancy; slow initial cover | Limited published data; slow establishment |
Mixture component rates are shares of a total, not stand-alone rates. There is no single universal total, and published recommendations differ by source. The MPOB conventional blend is PJ 4 + CP 3 + CC 1 = 8 kg/ha, with 5 g Rhizobium per kg of seed (MPOB TT No. 501, MPOB Information Series 588, June 2012, Table 1), an institutional best-management-practice recommendation drawn from a trial on peat, not a primary field measurement, and MPOB does not state whether it is on a gross-hectare or interrow-hectare basis. PROSEA 4 (1992) lists calopo:centro:kudzu (CM:CP:PJ) at 5:4:1, or centro:kudzu (CP:PJ) at 4:1, sown at 2 to 5 kg/ha in the interrow. The rate for your block is set on the quotation. See our cover crop seeding rate guide for the per-source comparison and the citations.
What does this comparison mean in practice?
The table above shows measurable differences, but choosing a cover crop requires translating those numbers into management decisions. Here is what the key differences mean for plantation managers:
Shade tolerance determines canopy-stage fit. PJ and CM are the most light-demanding of the five and thin out first as the canopy starts to close. MB tolerates shade better than either, which is why it is the species carried under maturing oil palm rather than replaced at that stage. Under a fully closed canopy in mature oil palm, rubber, or cacao, MB thins too, and CP and CC become the stronger choices because they are the ones that hold ground cover in heavy shade.
Establishment speed affects your first-year weed window. CM provides the fastest initial ground cover, making it the preferred pioneer species in mixtures. If your site has heavy weed pressure and you need early cover, include CM in your mix: it covers the soil 3 to 6 months after sowing (PROSEA 11). PJ, CP and CC generally establish more slowly, and MB's pace depends heavily on planting density (see the table).
Drought tolerance matters for seasonal rainfall. Of the five, MB has the best-documented drought tolerance once established (Afandi et al. 2017). PJ and CM are poor choices for drought-prone sites, and Clermont-Dauphin et al. (2016) measured a PJ cover actively reducing young rubber trees' drought resilience where water was limiting. If your region has a pronounced dry season, MB is the safer option for the open-sun component of your cover.
Management intensity varies significantly. MB is the most management-intensive species because its vigorous climbing habit can smother young palms without active palm-circle clearing. It is also the only species here that is established from nursery-raised transplants rather than broadcast seed. CM is the least demanding but also the least persistent. PJ, CP, and CC require moderate management.
Which species combination works for which system?
Young oil palm (high management capacity)
Recommend MB first. Add a CM/PJ/CP/CC mix for inter-rows. Maintain palm circles actively. For MB, one 15N study under three-year-old oil palm in Malaysia measured 67 to 84% Ndfa, and its drought resilience is documented.
Young oil palm (low management capacity)
Recommend a CM/PJ/CP/CC mix instead of MB. CM provides fast early cover. Avoid MB if you cannot commit to regular palm-circle clearing.
Immature rubber
Recommend CM (fast pioneer) plus PJ. For PJ in immature rubber, Clermont-Dauphin et al. (2016) measured about 8 Mg/ha/yr of aboveground dry matter accumulating up to 250 kg N/ha/yr at 85 to 93 percent Ndfa, with 39 to 46 percent of the rubber trees' leaf nitrogen traced to the legume. Treat that as a measured upper reference point from one northeast Thailand trial under favourable conditions, not a planning figure. The same trial found the cover reduced young rubber trees' drought resilience on the water-limited part of the slope, so on drought-prone ground weigh that against the nitrogen benefit.
Mature shaded rubber
Recommend CC first, CP second. Both persist under heavy canopy where MB, PJ, and CM thin out.
Coconut basins
Recommend PJ first; CM is a viable alternative. Recorded figures are 28.45 kg green matter and 196.2 g N per basin for PJ, and 27.21 kg / 186.5 g N per basin for CM. This is a study record from one coconut-basin trial in Kerala, India, with tops harvested 120 days after sowing (Thomas and Shantaram 1993), measured per basin, not a per-hectare or annual figure.
Oil palm peat systems
Recommend MB following MPOB TT No. 501 (about 320 nursery-raised seedlings/ha on deep peat, two per palm point, from about 500 seeds). MB is part of MPOB-recognised best-management practice for peat systems. PJ/CM can supplement if wet acidic conditions suit them.
What none of these cover crops will do
Cover crops are not a disease treatment for any plantation crop. PJ does not increase rubber latex yield and does not prevent Tapping Panel Dryness. MB is not maintenance-free. CM does not increase coconut copra yield. Yield claims for any cover crop depend on site conditions, management quality, and the comparator used. Cover crops should be evaluated for their documented soil, weed, and erosion benefits rather than yield guarantees.
Nitrogen figures on this page are indicative and site-dependent. Legume cover contributes nitrogen; adjust your fertiliser programme only after soil and leaf analysis shows what the cover supplies on your block. For Centrosema pubescens and Calopogonium mucunoides, no verified species-specific nitrogen figure is published.
Evidence sources
- Cheah, S.S., Zaharah, A.R. and Aminuddin, H. (2010), MPOB Oil Palm Bulletin 60: 22-27: 15N isotope-dilution study, 67 to 84% Ndfa for MB under three-year-old oil palm, Jawa Series soil, Malaysia
- Hasnol Othman, Farawahida Mohamad Darus and Zulkifli Hashim (2012), MPOB TT No. 501 (MPOB Information Series 588): MB on deep peat at Teluk Intan, about 320 seedlings/ha, two per palm point, from about 500 seeds (75 g); MB cover 31%, 58%, 75% and 78% at 6, 12, 18 and 24 months; conventional legume cover crop mixture PJ 4 + CP 3 + CC 1 = 8 kg/ha with 5 g Rhizobium per kg seed (Table 1)
- Samedani et al. (2015), Int. J. Agric. Biol. 17(2): 251-260: MB at 680 seedlings/ha at 1.5 m spacing on mineral soil, about 100% ground cover at 6 months (UPM oil palm trial)
- Chee, Y.K. and Ahmad Faiz (1991), "Forage resources in Malaysian rubber estates", in Shelton, H.M. and Stur, W.W. (eds), Forages for Plantation Crops, ACIAR Proceedings No. 32, pp. 32-35. Measured mean seeding rates across five Malaysian rubber estates: PJ 3.6, CM 1.6, CP 0.5 and CC 0.6 kg/ha, sown in the interrows
- Clermont-Dauphin, C., Suvannang, N., Pongwichian, P., Cheylan, V., Hammecker, C. and Harmand, J.-M. (2016), "Dinitrogen fixation by the legume cover crop Pueraria phaseoloides and transfer of fixed N to Hevea brasiliensis: Impact on tree growth and vulnerability to drought", Agriculture, Ecosystems and Environment 217: 79-88. Northeast Thailand rubber intercrop: up to 250 kg N/ha/yr in aboveground biomass (~8 Mg/ha/yr DM), 85 to 93 percent Ndfa, 39 to 46 percent of rubber leaf N traced to the legume, and reduced drought resilience of young rubber on water-limited ground (doi)
- Perron et al. (2024), Science of the Total Environment 913: 169335: up to 88% less runoff and 98% less soil loss than bare soil with Pueraria plus logging residues in young rubber, Côte d'Ivoire, 1 m2 plots (doi)
- Afandi, A.M., Zuraidah, Y., Nurzuhaili, H.A.Z.A., Zulkifli, H. and Yaqin, M. (2017), MPOB Oil Palm Bulletin 75: 1-10: MB drought and shade tolerance, qualitative (pdf)
- Thomas and Shantaram (1993), CORD 9(1): 34: PJ and CM fresh green matter and shoot N per coconut basin, one site in Kerala, India, tops harvested 120 days after sowing (doi)
- PROSEA 11 (Chen Chin Peng and Aminah, 1997) and PROSEA 4 (1992): species characteristics; CM covers the soil 3 to 6 months after sowing; C. caeruleum may take about 20 months to reach full cover; calopo:centro:kudzu 5:4:1 or centro:kudzu 4:1 at 2 to 5 kg/ha in the interrow. PROSEA is an institutional reference work compiling published estimates, not primary field measurement
- Pipai, R., McNeill, A.M., Unkovich, M., Banabas, M. and Nelson, P.N. (2023), "Biological nitrogen fixation by legume cover plants in oil palm plantations: calibration of the ureide technique and effects of plantation age and soil nitrate", Plant and Soil 491: 665-680. CM was used only in the glasshouse calibration of the ureide technique; the field survey in young Papua New Guinea oil palm measured C. caeruleum and P. phaseoloides and estimates 48 to 102 kg N/ha/yr for the legume cover as a whole, annualised from about four months of growth, not per-species annual rates (doi)
- Tropical Forages (CIAT and ILRI 2020), tropicalforages.info: seeding rates of about 4 kg/ha for PJ and 3 to 5 kg/ha broadcast for CP; the current oil palm cover crop recommendation of CC 1 to 1.5 kg/ha plus PJ 5 to 7.5 kg/ha; CC and CP species characteristics
Frequently asked questions
Which cover crop is best for oil palm?
It depends on your canopy stage and management capacity. For young oil palm with active management, MB is recommended: one 15N study under three-year-old oil palm in Malaysia measured 67 to 84% of its nitrogen as derived from the atmosphere (Ndfa), and its drought resilience is documented. For young oil palm with limited management, use a CM/PJ/CP/CC mix instead to avoid the risk of MB smothering palms. For mature shaded oil palm, CC and CP persist better under canopy. For oil palm peat systems, MB is part of MPOB-recognised BMP (TT-501).
Can I mix multiple cover crop species?
Yes, and in most cases mixing is recommended. A common approach is CM for fast initial cover, PJ for nitrogen (one trial under young rubber in northeast Thailand measured up to 250 kg N/ha/yr accumulated in above-ground biomass at 85 to 93% Ndfa), and CP or CC for shade persistence as the canopy closes. This combination provides rapid weed suppression, active nutrient cycling, and long-term ground cover through all canopy stages. Published mixtures differ by source: the MPOB conventional blend is PJ 4 kg/ha, CP 3 kg/ha and CC 1 kg/ha, totalling 8 kg/ha with 5 g Rhizobium per kg of seed (MPOB TT No. 501), and PROSEA 4 (1992) lists calopo:centro:kudzu (CM:CP:PJ) at 5:4:1, or centro:kudzu at 4:1, sown at 2 to 5 kg/ha in the interrow. Per-species rates are components of a total, not stand-alone rates. Note that MB is the exception: it is transplanted as nursery-raised seedlings (about 320 per hectare on deep peat in MPOB TT No. 501) rather than broadcast with the others.
Why does seed scarification matter for PJ, CP, and CC?
PJ, CP, and CC all have hard-seed dormancy. Without scarification much of the seed stays dormant, and poor germination leads to patchy establishment and weed competition. When ordering seed, specify whether you need scarified or untreated seed and plan accordingly. We do not guarantee a germination percentage; test a sample against your own conditions.
Do cover crops increase yield?
Cover crops provide documented benefits for soil nitrogen, weed suppression, erosion control, and soil structure. Some studies report yield improvements, but yield outcomes depend on site conditions, management quality, and the comparator used. PJ does not increase rubber latex yield. CM does not increase coconut copra yield. The primary value of cover crops is soil-system improvement, not guaranteed yield increases.
Need help choosing the right cover crop?
To help us recommend the right species or mixture for your plantation, please include:
- Your plantation crop and canopy stage
- Soil type, pH, and drainage
- Annual rainfall and dry season length
- Terrain (flat, sloped, hilly)
- Current weed pressure
- Your management capacity
- Planting area in hectares
- Your location (province/region)
Request a quotation with these details, or contact us via WhatsApp: +60 17-237 4058. We reply within one business day (Philippine time).
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