Cover Crops for Tropical Plantations: The Complete Guide
Cover crops are plants grown to cover and protect the soil rather than for harvest. In tropical oil palm and rubber plantations, leguminous cover crops (LCCs) are sown between young trees to fix nitrogen, reduce erosion and weeds, and build soil organic matter. The main species used in Southeast Asia are Mucuna bracteata, Pueraria javanica, Calopogonium mucunoides, Centrosema pubescens, and Calopogonium caeruleum.
Why plantations grow cover crops
- Nitrogen: legume cover crops fix atmospheric nitrogen and reduce reliance on applied fertiliser during the immature phase
- Erosion control: a living cover protects soil from rainfall impact and runoff on slopes
- Weed suppression: dense ground cover shades out weeds and lowers weeding costs
- Soil organic matter: heavy biomass and leaf litter feed soil organic matter and biology
- Moisture: ground cover helps retain soil moisture during dry spells
What is a leguminous cover crop?
A leguminous cover crop is a legume grown for ground cover rather than grain. Through a partnership with Rhizobium bacteria in their roots, legumes fix nitrogen from the air and make part of it available to the system. In plantations they are established between rows of young palm or rubber, where they cover bare soil quickly and add organic matter as they grow and decompose.
The five main species
Each species suits different conditions. Use the overview below, then see the detailed guides and product pages.
- Mucuna bracteata (MB): highest biomass (up to about 28 t/ha in the open), deep-rooting, drought-tolerant. Nursery-raised and transplanted. Best for immature oil palm and rubber. See the Mucuna bracteata guide.
- Pueraria javanica (PJ): fast-establishing broadcast species, strong nitrogen contribution (up to about 250 kg N/ha/yr). See the Pueraria javanica guide.
- Calopogonium mucunoides (CM): fast early cover, good for erosion control in young stands. See the Calopogonium mucunoides guide.
- Centrosema pubescens (CP): shade-tolerant perennial, high biomass-nitrogen, persists in older stands. See the Centrosema pubescens guide.
- Calopogonium caeruleum (CC): hardy perennial for long-term cover as the canopy closes. See the Calopogonium caeruleum guide.
For a side-by-side view, see the five-species comparison.
Seeding rates
| Species | Monoculture | In mixture |
|---|---|---|
| Pueraria javanica (PJ) | 4 to 6 kg/ha | 2 to 4 kg/ha |
| Calopogonium mucunoides (CM) | 4 to 6 kg/ha | 1 to 3 kg/ha |
| Centrosema pubescens (CP) | 3 to 4.5 kg/ha | part of mix |
| Calopogonium caeruleum (CC) | 3 to 4.5 kg/ha | part of mix |
| Mucuna bracteata (MB) | Nursery-raised and transplanted, about 320 seedlings/ha (roughly 85 to 100 g seed/ha). Not broadcast. | |
A common broadcast mixture is Pueraria javanica, Calopogonium mucunoides, and Centrosema pubescens in roughly equal parts at 3 to 5 kg/ha total. Plan exact quantities with the cover crop calculator.
How to choose a cover crop
Match the species to the crop and growth stage. For oil palm, see best cover crop for oil palm by growth stage; for rubber, see best cover crop for rubber by canopy stage. If the priority is slope protection, see cover crops for erosion control; for inter-row weed pressure, see cover crops for weed suppression.
Frequently asked questions
What is a cover crop?
A plant grown to cover and protect the soil rather than for harvest. In plantations, leguminous cover crops fix nitrogen, reduce erosion and weeds, and build soil organic matter.
Which cover crop is best for oil palm?
It depends on estate age and conditions. MB suits immature blocks needing rapid cover; PJ and CM establish fast from broadcast seed; CP and CC tolerate more shade for older stands. Many estates use a mixture.
How much cover crop seed per hectare?
Broadcast species at a few kg/ha (PJ 4 to 6, CM 4 to 6, CP and CC 3 to 4.5 in monoculture, less in mixtures). MB is nursery-transplanted at about 320 seedlings/ha, not broadcast.
How much nitrogen do cover crops fix?
Reported figures include MB 67 to 84 percent of its N from fixation (about 150 to 200 kg N/ha/yr), PJ up to about 250 kg N/ha/yr, and biomass-N of about 154 kg/ha (CM) and up to about 293 kg/ha (CP). Figures vary with method, soil, and management.
Related reading
- Best Cover Crops for Tropical Climates in Malaysia
- Cover Crop Establishment Guide: From Planting to 80% Ground Cover
- Multi-Species Cover Crop Mixes: Why Blending Outperforms Single-Species Planting
- Cover Crop Seed Buyer's Guide for Malaysian Plantations
- Soil Health Foundations: Why Cover Crops Are Essential for Malaysian Plantations
Source cover crop seed for your plantation
Chemiseed supplies all five tropical cover crop species with germination-tested seed and agronomic support. Browse the cover crop seeds collection, request a quote, or plan quantities with the cover crop calculator.
Sources: MPOB (Oil Palm Bulletin 60; TT-501); Tropical Forages database (CSIRO, CIAT, ILRI); Philippine field studies on Calopogonium and Centrosema soil-nitrogen contribution. Figures are presented with method and context; results depend on site, soil, rainfall, and management. Last reviewed May 2026.