Cover Crops for Oil Palm Replanting in Malaysia

Cover Crops for Oil Palm Replanting in Malaysia

Establishing legume ground cover during the replanting window, by Chemiseed Sdn. Bhd.

Oil palm replanting site in Malaysia with felled trunks and cleared land using zero burn practice
In short: Replanting is the single best moment to establish cover crops in an oil palm estate. Once the old stand is felled and the land is cleared, the soil sits bare and exposed through the immature phase before the new canopy closes. Sowing a legume cover crop mix at this stage protects that open soil from erosion and runoff, adds nitrogen to the rootzone, suppresses weeds between the young palms, and supports soil recovery. Practical species for a Malaysian replant are Calopogonium mucunoides (CM) as a fast pioneer, Pueraria javanica (PJ) for durable nitrogen-fixing cover, and Mucuna bracteata (MB) established by nursery transplant.

At a glance

Question Replanting answer
When to establish At clearing or immediately after, while soil is bare and before canopy closes
Main risk addressed Erosion and runoff on cleared, exposed replant land
Fast pioneer Calopogonium mucunoides (CM), 4 to 6 kg/ha
Durable cover Pueraria javanica (PJ), 4 to 6 kg/ha
By transplant Mucuna bracteata (MB), nursery-raised, about 320 seedlings/ha
Soil conditioner SoilBoost EA humic acid, to support soil recovery and structure

Why the replanting window is the critical time

Oil palm runs on a roughly 25-year cycle. At replanting, the old palms are felled and the ground is opened up. For the first few years the new palms are immature and the canopy is open, which means a large share of the soil surface is bare and exposed to sun and heavy tropical rainfall. This is exactly the phase where erosion, surface runoff, and weed invasion do the most damage, and it is also the phase where a cover crop delivers the most value.

Establishing legume ground cover at replanting means the cover is already working through the whole immature period: holding soil in place, feeding nitrogen into the rootzone, and crowding out aggressive weeds before they take hold. Waiting until the palms are older is far less effective, because a closing canopy shades out most cover crop species. For more on matching species to each phase, see our best cover crop for oil palm guide and the complete cover crops guide.

Legume cover crop establishing between young immature oil palms after replanting in Malaysia
Cover crop established early works through the whole immature phase.

Species for replanting

Calopogonium mucunoides (CM): fast pioneer

CM establishes quickly and gives early ground cover on freshly cleared land, which is why it is often used as the pioneer component of a replanting mix. It tolerates acidic soils and provides rapid biomass while slower species fill in. Sow at 4 to 6 kg/ha.

Pueraria javanica (PJ): durable nitrogen-fixing cover

PJ is a workhorse legume for plantation ground cover. In immature rubber and oil palm it can fix on the order of 250 kg of nitrogen per hectare per year, returning that nitrogen to the soil as the cover is grazed back and recycled. It tolerates a wide pH range and gives durable, longer-lived cover than CM alone. Sow at 4 to 6 kg/ha. See Pueraria javanica (PJ) seed.

Mucuna bracteata (MB): by nursery transplant

MB is established from nursery-raised seedlings, not broadcast. The common reference rate is about 320 seedlings per hectare (roughly 85 to 100 g of seed per hectare raised in the nursery). MB produces a thick mat that is strong on weed suppression and biomass, but it is vigorous and needs active palm-circle maintenance so it does not climb the young palms.

Nitrogen contribution reduces early fertiliser cost

Legume cover crops fix atmospheric nitrogen through root nodules and return it to the soil. During the immature phase, when young palms are building their root and frond system, this biological nitrogen supplements the fertiliser programme and can reduce early synthetic nitrogen requirements. Cover crops supplement fertiliser, they do not replace it: keep adjusting your fertiliser to soil and foliar analysis rather than to cover crop presence alone.

Erosion and runoff control on cleared replant land

Bare replant soil on any slope is highly vulnerable to erosion and surface runoff in tropical downpours. A living legume cover intercepts rainfall, binds the surface with roots, and slows runoff, keeping topsoil and applied nutrients on site instead of washing into drains and waterways. This is the headline reason to get cover established at the replanting stage rather than later. For state-specific guidance, see our pages for Sabah and Sarawak.

SoilBoost EA to support soil recovery at replant

Replanting is a natural moment to rebuild soil condition before the new stand establishes. SoilBoost EA is a humic acid soil conditioner manufactured exclusively by Chemiseed Sdn. Bhd. in Malaysia (60.6% humic acid by the CDFA method, pH 3.84, 0.45% sulfur, Leonardite-derived). It is used to support soil structure and the soil conditions that help cover crops and young palms establish. Apply by broadcast at 50 to 100 kg/ha, or by drench at 10 to 15 kg/ha. SoilBoost EA is a soil conditioner, not a fertiliser substitute and not a disease treatment.

Cover crops fit into a replanting programme

Malaysian smallholder oil palm replanting is supported by a government replanting scheme administered for smallholders, commonly referenced at around RM14,000 per hectare. Cover crop establishment fits naturally into a planned replanting programme alongside felling, land preparation, and new palm planting. For background on the scheme, see our blog article on oil palm replanting support in Malaysia. We do not administer the scheme and do not advise on eligibility; refer to the official programme for those details.

Frequently asked questions

When in the replanting cycle should I sow cover crops?
At land clearing or immediately after, while the soil is still bare and the new palms are immature. Establishing early means the cover is protecting soil and fixing nitrogen through the whole open-canopy phase, which is when it matters most.
Which species mix is best for a replant?
A common approach is CM as a fast pioneer for early cover, PJ for durable nitrogen-fixing ground cover, and MB by nursery transplant where a thick weed-suppressing mat is wanted. Contact our team for a mix matched to your soil and slope.
How much seed do I need per hectare?
As a starting reference: CM 4 to 6 kg/ha, PJ 4 to 6 kg/ha, and MB about 320 nursery-raised seedlings/ha (around 85 to 100 g of seed/ha raised in the nursery). Final rates depend on your site and mix.
Do cover crops replace fertiliser during replanting?
No. Legume cover crops fix nitrogen and can reduce early synthetic nitrogen needs, but they supplement the fertiliser programme rather than replace it. Continue to base fertiliser on soil and foliar analysis.
Where does SoilBoost EA fit at replanting?
SoilBoost EA is a humic acid soil conditioner used to support soil structure and recovery as the new stand establishes. Broadcast at 50 to 100 kg/ha or drench at 10 to 15 kg/ha. It is not a fertiliser substitute and not a disease treatment.

Planning a replant? Get your cover crop seed sorted early

Talk to the Chemiseed team in Malaysia for a cover crop mix and seeding plan matched to your replanting programme, soil, and slope. Trial and estate quantities available.

WhatsApp: +60 17-237 4058 | Email: info@chemiseed.com

Browse cover crop seeds | Pueraria javanica (PJ) | SoilBoost EA

References and notes: Seeding rates and the PJ nitrogen-fixation figure (about 250 kg N/ha/yr in immature rubber and oil palm) are starting references reconciled from MPOB and tropical forage literature; final rates depend on site conditions. MB is established by nursery transplant, not broadcast. The Malaysian smallholder oil palm replanting support scheme is referenced generally and is administered by the relevant government programme, not by Chemiseed. SoilBoost EA specification values follow the Chemiseed product specification.