Centrosema pubescens (CP): Cover Crop Guide for Tropical Plantations

Centrosema pubescens (CP) is a shade-tolerant perennial leguminous cover crop used in tropical oil palm and rubber plantations. It fixes nitrogen, persists as the canopy closes, and provides durable ground cover and a high biomass-nitrogen contribution. CP is broadcast-seeded and often grown in mixtures with faster pioneer species.

What is Centrosema pubescens?

Centrosema pubescens is a twining perennial legume grown as a cover crop in plantation systems. It is slower to establish than pioneer species but more persistent and shade-tolerant, which makes it valuable for keeping soil covered into the later, more shaded years of a plantation. In association with Rhizobium in its roots it fixes nitrogen and returns nutrients through leaf litter.

Why plantations use Centrosema pubescens

Nitrogen contribution

Field studies report biomass-nitrogen contributions up to about 293 kg N per hectare, among the highest of the common tropical legume cover crops. This supports soil fertility and reduces reliance on applied nitrogen.

Persistence and shade tolerance

Unlike fast pioneer species that fade as light is reduced, CP tolerates shade and persists into the maturing canopy, extending the useful life of the ground cover.

Ground cover and erosion

CP forms a durable cover that protects soil from rainfall and runoff and helps retain moisture, particularly on slopes and in older stands.

How to establish Centrosema pubescens

1. Scarify the seed. Hard CP seed germinates more evenly after scarification, commonly a hot-water soak.
2. Broadcast. Sow at 3 to 4.5 kg/ha in monoculture, or at a lower rate as part of a mixture with PJ and CM.
3. Time it well. Establish in the inter-rows of young plantings so the cover is in place early, then relies on its persistence as the canopy develops.

Where Centrosema pubescens fits, and where it does not

Well suited to: maturing and mature oil palm and rubber, sites that need long-term persistent cover, and mixtures where it provides staying power after pioneer species decline.

Less suitable for: situations needing the fastest possible early cover, where a pioneer species such as Calopogonium mucunoides establishes more quickly. CP is commonly paired with such species rather than used alone for rapid cover.

Compared with other cover crops

CP is the persistence and shade-tolerance specialist of the common species. Calopogonium mucunoides and Pueraria javanica establish faster; Mucuna bracteata produces the most biomass but is transplanted. See the five-species comparison and the cover crops guide.

Frequently asked questions

What is Centrosema pubescens?
A shade-tolerant perennial legume cover crop valued for persistence and a high nitrogen contribution in tropical plantations.

How much CP seed per hectare?
About 3 to 4.5 kg/ha in monoculture, less in a mixture; broadcast after scarifying.

How much nitrogen does CP contribute?
Biomass-nitrogen up to about 293 kg N/ha in field studies, among the highest of the common cover crops; varies with method and conditions.

Is CP good for mature plantations?
Yes, it tolerates shade and persists as the canopy closes in older stands.

Related reading

• Multi-Species Cover Crop Mixes: Why Blending Outperforms Single-Species Planting
• How to Choose the Right Cover Crop for Your Malaysian Estate
• Nitrogen Fixation in Tropical Plantations: How Legume Cover Crops Cut Fertiliser Costs
• Best Cover Crops for Tropical Climates in Malaysia

Sources: Philippine field studies on Calopogonium and Centrosema soil-nitrogen contribution; Tropical Forages database (CSIRO, CIAT, ILRI). Figures are given with method and context; results depend on site, soil, rainfall, and management. Last reviewed May 2026.