Cover Crops for Oil Palm in Sabah, Malaysia

Cover Crops for Oil Palm in Sabah, Malaysia

Species selection, erosion control, and soil support for Sabah estates and smallholders, by Chemiseed Sdn. Bhd.

Oil palm plantation rows in Sabah, Malaysia, on undulating estate terrain
Short answer: Sabah is Malaysia's largest oil palm state, with large estates and many smallholders working both mineral and some peat soils across mature and replanting blocks. For immature and replanting land, a Pueraria javanica (PJ) led legume cover with Mucuna bracteata (MB) where active circle maintenance is possible gives erosion control on slopes, biological nitrogen fixation that supports the fertiliser programme, and weed suppression. On acidic mineral soils, SoilBoost EA humic acid can be added to support soil structure and nutrient retention. Chemiseed supplies seed and SoilBoost EA from Malaysia and recommends species by block. Minta sebut harga from the Chemiseed team in Malaysia.
At a glance
  • State context: Sabah is Malaysia's largest oil palm state, with large estates and many smallholders.
  • Soils: mainly mineral, with some peat; acidic mineral soils are common.
  • Blocks: a mix of mature stands and replanting or exposed replant land.
  • Cover crop goals: erosion control on slopes, nitrogen fixation supporting fertiliser, weed suppression.
  • Lead species: PJ for inter-rows and slopes; MB where circle maintenance is possible; CM on acidic clay.
  • Soil conditioner: SoilBoost EA humic acid for structure and retention on acidic soils.

Cover Crop Selection for Sabah Estates

Mature and replanting blocks

Sabah estates run on long crop cycles, so at any time a property usually holds both mature stands and blocks under replanting. The cover crop priorities differ by block. In mature, closed-canopy stands, shade limits most legume covers and the practical focus is maintaining whatever ground cover persists in lighter patches. The strongest opportunity for cover crops is the immature and replanting phase, when the canopy is open, the ground is exposed, and erosion and weed pressure are highest.

Erosion control on slopes and exposed replant land

Much of Sabah's oil palm sits on undulating to sloping terrain. During replanting, when old palms are felled and the ground is cleared, bare soil on slopes is exposed to heavy tropical rainfall. A fast establishing legume cover protects the surface, slows runoff, and holds soil while the new stand establishes. A PJ led mix suits slope management because its growth is moderate and easier to keep off young palms than the most vigorous covers.

Sloping oil palm land in Malaysia with soil erosion and runoff where ground cover is absent
Bare, sloping replant land is where ground cover matters most.

Nitrogen fixation supporting the fertiliser programme

Leguminous cover crops fix atmospheric nitrogen through their root nodules and recycle nutrients as their biomass breaks down. This supports, but does not replace, the estate fertiliser programme. Synthetic nitrogen requirements can often be reduced where cover is well established, but rates should still be set from soil and foliar analysis rather than from cover crop presence alone.

Weed suppression

A dense legume cover competes with aggressive weeds such as Imperata cylindrica (lalang) and Mikania micrantha, reducing the manual and chemical weeding burden in the inter-rows during the immature phase.

Species Selection

Situation in Sabah Lead species Notes and seeding rate
Immature or replant, mineral slopes PJ (Pueraria javanica) Moderate growth, easier slope management. PJ 4 to 6 kg/ha.
Immature, flatter mineral land, active maintenance MB (Mucuna bracteata) Vigorous cover. Nursery transplanted at about 320 seedlings/ha (about 85 to 100 g seed/ha), not broadcast.
Acidic clay patches CM (Calopogonium mucunoides) Acid tolerant pioneer. CM 4 to 6 kg/ha.
Mixed or wetter or shadier patches CP / CC CP 3 to 4.5 kg/ha; CC 3 to 4.5 kg/ha. Use to fill microsites.

Many Sabah estates run a two or three species mix matched to microsite: PJ across inter-rows and slopes, MB in open blocks where teams can maintain the palm circles, and CM or CP for acidic or wetter patches.

The Role of SoilBoost EA on Acidic Soils

SoilBoost EA is a humic acid soil conditioner manufactured exclusively by Chemiseed Sdn. Bhd. in Malaysia. It is Leonardite derived and tests at 60.6 percent humic acid by the CDFA method, pH 3.84, with 0.45 percent sulfur. On the acidic mineral soils common in Sabah, humic acid supports soil structure, cation exchange, and water and nutrient retention, which complements a legume cover programme. Typical use is broadcast at 50 to 100 kg/ha or drench at 10 to 15 kg/ha. SoilBoost EA is a soil conditioner that supports soil health and crop resilience. It is not a fertiliser substitute and not a disease treatment.

Frequently Asked Questions

Which cover crop is best for oil palm in Sabah?
For most immature and replanting blocks on mineral slopes, a Pueraria javanica (PJ) led legume mix is the practical lead, at 4 to 6 kg/ha. Mucuna bracteata (MB) suits flatter open blocks where the team can maintain palm circles, established by nursery transplant at about 320 seedlings/ha. Calopogonium mucunoides (CM) suits acidic clay patches.
Can cover crops reduce my fertiliser cost in Sabah?
Legume covers fix atmospheric nitrogen and recycle nutrients, which supports the fertiliser programme and can reduce synthetic nitrogen needs where cover is well established. They do not replace fertiliser. Set rates from soil and foliar analysis.
How do cover crops help on sloping replant land?
A fast establishing legume cover protects bare soil on slopes during replanting, slows runoff, and holds soil while the new stand establishes. PJ's moderate growth is easier to keep off young palms than the most vigorous covers.
What does SoilBoost EA do on acidic Sabah soils?
SoilBoost EA is a humic acid soil conditioner (60.6 percent humic acid by the CDFA method, pH 3.84) manufactured by Chemiseed in Malaysia. It supports soil structure and nutrient retention on acidic mineral soils. Broadcast 50 to 100 kg/ha or drench 10 to 15 kg/ha. It is not a fertiliser substitute and not a disease treatment.
Do you supply smallholders as well as estates in Sabah?
Yes. Chemiseed supplies both large estates and smallholders, with species and quantities matched to your block. Contact the Chemiseed team in Malaysia for a quote.

Minta sebut harga untuk ladang sawit anda di Sabah

Hubungi pasukan Chemiseed di Malaysia for cover crop seed and SoilBoost EA matched to your blocks, soils, and slopes.

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

Best cover crop for oil palm | Cover crops guide | Cover crops for Sarawak oil palm | Cover crop seeds | Pueraria javanica (PJ) | SoilBoost EA

References and notes: Seeding rates follow Chemiseed species guidance (PJ 4 to 6 kg/ha; MB nursery transplanted at about 320 seedlings/ha, about 85 to 100 g seed/ha; CM 4 to 6 kg/ha; CP and CC 3 to 4.5 kg/ha). SoilBoost EA specification values (60.6 percent humic acid by the CDFA method, pH 3.84, 0.45 percent sulfur, Leonardite derived) are from product testing. State context reflects Sabah as Malaysia's largest oil palm state with large estates and many smallholders on mineral and some peat soils. This page is informational and does not promise yield increases from cover crops alone.