Cover Crops for Oil Palm in Kalimantan, Indonesia

For Kalimantan oil palm, early ground cover is the priority: many blocks are immature or newly planted on cleared and often peaty land, where a fast leguminous cover controls erosion, fixes nitrogen, and protects exposed soil while the canopy establishes. A fast pioneer gives rapid cover, then vigorous and longer-lived legumes carry it forward. SoilBoost EA supports soil structure and nutrient retention on these soils.

Aerial view of a Kalimantan oil palm plantation at sunset with young palms and establishing ground cover

At a glance

  • Region: Kalimantan is Indonesia's second-largest oil palm region, spanning Central, East, West, and South Kalimantan
  • Estate mix: significant immature and newer plantings, extensive peat areas, and exposed cleared land
  • Why it matters: early ground cover during canopy establishment, erosion and runoff control on cleared and sloping land, nitrogen fixation, and weed suppression
  • Fast pioneer: Calopogonium mucunoides (CM) for rapid early cover, 4 to 6 kg/ha
  • Core legumes: Pueraria javanica (PJ) 4 to 6 kg/ha; Mucuna bracteata (MB) nursery-transplanted at about 320 seedlings/ha
  • Shade-tolerant for canopy closure: Centrosema pubescens (CP) 3 to 4.5 kg/ha; Calopogonium caeruleum (CC) 3 to 4.5 kg/ha
  • Soil support: SoilBoost EA humic acid conditioner (60.6% humic acid by the CDFA method, pH 3.84, 0.45% sulfur, Leonardite-derived)

Cover crops for Kalimantan oil palm

Kalimantan is Indonesia's second-largest oil palm region, across Central, East, West, and South Kalimantan. Compared with Sumatra, a larger share of the area is immature or newly planted, with extensive peat and a great deal of recently cleared, exposed land. On these blocks, getting a protective leguminous cover established early is the single most valuable step:

  • Early ground cover: a fast pioneer covers exposed soil quickly during the months after planting, when the ground is most vulnerable.
  • Erosion and runoff control: a living cover protects cleared and sloping land, slowing surface runoff before the canopy closes.
  • Nitrogen fixation: legumes fix atmospheric nitrogen in partnership with soil bacteria, returning it to the system as the cover decomposes.
  • Weed suppression: a dense legume mat shades out weeds and reduces manual and chemical weeding.
  • Organic matter: continuous biomass turnover feeds soil organic matter and biological activity.

Fast pioneer cover for immature blocks

On Kalimantan's immature and newly cleared blocks, speed of establishment matters. Calopogonium mucunoides (CM) is a useful fast pioneer because it establishes quickly and gives rapid early ground cover (seeding rate 4 to 6 kg/ha). It is typically sown with longer-lived legumes such as Pueraria javanica (PJ, 4 to 6 kg/ha) so that, as the fast pioneer thins, the vigorous core legume carries the cover forward. Mucuna bracteata (MB) provides dense, persistent cover and is nursery-raised and transplanted at about 320 seedlings/ha, not broadcast.

Soil erosion on a bare cleared plantation slope without ground cover, illustrating runoff risk on Kalimantan blocks

Erosion and runoff control on cleared and sloping land

Newly cleared land in Kalimantan is exposed to heavy tropical rainfall before any canopy has formed. On sloping ground this can drive significant surface runoff and erosion. A living legume cover protects the soil surface, slows runoff, and holds soil in place through the immature years. Establishing a fast pioneer early, then carrying the cover forward with vigorous and shade-tolerant legumes, keeps the ground protected from clearing through to canopy closure.

Species selection by stage

Calopogonium mucunoides (CM): fast pioneer

CM establishes quickly and gives rapid early ground cover, making it the workhorse pioneer on immature and newly cleared Kalimantan blocks. Seeding rate: 4 to 6 kg/ha.

Pueraria javanica (PJ): vigorous core legume

PJ (tropical kudzu) is a vigorous, widely used core legume for oil palm, valued for biomass and nitrogen contribution. Seeding rate: 4 to 6 kg/ha.

Mucuna bracteata (MB): nursery-raised, long-lived cover

MB produces dense, persistent ground cover. It is nursery-raised and transplanted at about 320 seedlings/ha (roughly 85 to 100 g of seed/ha), not broadcast like the other species.

Centrosema pubescens (CP) and Calopogonium caeruleum (CC): shade tolerant for canopy closure

As the palm canopy closes and light at ground level drops, shade-tolerant legumes carry the cover forward. CP seeding rate: 3 to 4.5 kg/ha. CC seeding rate: 3 to 4.5 kg/ha. These species are often combined with pioneers in a mixed cover strategy.

Calopogonium mucunoides cover crop seeds, a fast pioneer for immature Kalimantan oil palm blocks

Ground cover during canopy establishment

The years before canopy closure are when the soil is most exposed and the cover crop does most of its work. A well-established legume cover holds soil, suppresses weeds, conserves moisture, and adds nitrogen and organic matter through the immature phase. As the canopy closes and shade increases, shade-tolerant legumes such as Centrosema pubescens and Calopogonium caeruleum keep the ground covered.

The role of SoilBoost EA on Kalimantan soils

SoilBoost EA is a Leonardite-derived humic acid soil conditioner manufactured exclusively by Chemiseed Sdn. Bhd. in Malaysia. It is 60.6% humic acid by the CDFA method, pH 3.84, with 0.45% sulfur. On the acidic and leaching-prone soils common across Kalimantan's oil palm areas, a humic acid conditioner supports soil structure and nutrient retention. SoilBoost EA is applied by broadcast at 50 to 100 kg/ha or by drench at 10 to 15 kg/ha. It is a soil conditioner: it is not a fertiliser substitute and not a disease treatment.

Frequently asked questions

Which cover crop is best for immature oil palm in Kalimantan?

A fast pioneer such as Calopogonium mucunoides (4 to 6 kg/ha) for rapid early cover, sown with a vigorous core legume like Pueraria javanica (4 to 6 kg/ha), is a common choice on immature and newly cleared blocks.

How do cover crops help on cleared and sloping land?

A living legume cover protects exposed, cleared soil and slows surface runoff on sloping ground before the canopy closes, reducing erosion while building nitrogen and organic matter.

How is Mucuna bracteata established?

Mucuna bracteata is nursery-raised and transplanted at about 320 seedlings/ha (roughly 85 to 100 g of seed/ha). It is not broadcast like the other species.

What does SoilBoost EA do on Kalimantan soils?

SoilBoost EA is a humic acid soil conditioner that supports soil structure and nutrient retention on acidic, leaching-prone soils. It is applied at 50 to 100 kg/ha by broadcast or 10 to 15 kg/ha by drench. It is not a fertiliser substitute.

Where can I buy these cover crop seeds in Kalimantan?

Contact Windhi, Chemiseed's Indonesia representative, for a quotation. She supports the whole process in Bahasa Indonesia.

Get a quote for your Kalimantan plantation

Minta penawaran or Hubungi Windhi (perwakilan Indonesia):

Related pages and products

References: Seeding rates and application figures per Chemiseed cover crop and SoilBoost EA specifications and established tropical agronomy practice (Mucuna bracteata nursery transplanting; broadcast rates for PJ, CM, CP, CC). General context on Kalimantan as a major Indonesian oil palm region is well established in industry literature.