Cover Crops in Sri Lanka

Chemiseed supplies leguminous cover crop seeds and SoilBoost EA soil conditioner from Malaysia, on request, for rubber, coconut, and tea systems in Sri Lanka. Cover crops fix nitrogen, hold soil on slopes during the immature phase of tree crops, suppress weeds, conserve moisture, and build organic matter.

At a glance: Sri Lanka context

  • Rubber: Rubber is concentrated in the wet zone in Kalutara, Ratnapura, Kegalle, and Galle districts, with a long agronomic history of legume ground cover including Pueraria spp.
  • Coconut: Coconut is grown across the coastal triangle of Kurunegala, Puttalam, and Gampaha, where inter-row legumes support biomass and organic matter recovery.
  • Tea: Tea estates in Nuwara Eliya, Badulla, Kandy, and Ratnapura sit on sloping land where ground cover and erosion control are critical.
  • Common challenges: high rainfall in the wet zone, sloping terrain, leaching-prone soils, and the need for fast early cover at rubber and coconut establishment.

Cover crop species relevant to Sri Lanka

Pueraria javanica (PJ): vigorous core legume

Pueraria species have a long history in Ceylon rubber ground cover, where Pueraria phaseoloides has been the traditional reference. Pueraria javanica is used today as the standard core tropical kudzu in regional plantation supply. The recommended seeding rate for Pueraria javanica is 10 kg/ha sown alone (Chemiseed recommendation, 2026 catalogue); the quantity for your site is confirmed on the quotation. The most defensible published nitrogen figure for this species comes from a single rubber-intercrop trial in northeast Thailand, where the cover accumulated up to 250 kg N per hectare per year in aboveground biomass, with 85 to 93% of that nitrogen drawn from the atmosphere (Clermont-Dauphin et al. 2016, Agriculture, Ecosystems & Environment 217:79-88). Treat that as a measured upper reference point from one trial on one site, not as a design value to plan a fertiliser programme against. The same trial also found that the legume cover reduced the drought resilience of the young rubber trees on water-limited ground, which matters most on intermediate- and dry-zone sites rather than in the wet zone.

Mucuna bracteata (MB): long-lived cover

MB has been documented in coconut systems for its biomass and persistence. Recommended seeding rate: 1 kg/ha sown alone, drilled or planted in holes; MB is not broadcast. MB can also be raised in a nursery and transplanted; in MPOB's trial on deep peat, 320 seedlings per hectare, two per palm point, were raised from about 500 seeds (75 g) (MPOB TT No. 501), and Samedani et al. (2015) planted 680 seedlings per hectare at 1.5 m spacing on mineral soil. MB is the shade-tolerant species in this group, which is why it is used under a maturing canopy, while PJ thins as the canopy closes. Isotope work puts MB at 67 to 84% of its nitrogen drawn from the atmosphere (Cheah, Zaharah & Aminuddin 2010, Oil Palm Bulletin 60). We do not publish an absolute kg N/ha figure for MB, because no traceable measurement supports one.

Calopogonium mucunoides (CM): fast pioneer

CM is a pioneer at rubber and coconut establishment: it covers the soil 3 to 6 months after sowing, sooner on newly cleared fertile land, and forms a dense sward at 4 to 5 months (PROSEA 11, Chen Chin Peng and Aminah 1997). The recommended seeding rate is 10 kg/ha sown alone; the quantity for your site is confirmed on the quotation.

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

As canopy closes in rubber and coconut, shade-persistent legumes carry the cover forward. CP and CC are the successors in that role. Recommended seeding rates (sown alone): CP 10 kg/ha; CC 5 kg/ha (Chemiseed recommendation, 2026 catalogue). These rates are for one species sown alone. For a mixture, the quantity of each species is set on the quotation for your site. For the record, MPOB's trial on deep peat (MPOB TT No. 501, Information Series 588, June 2012, Table 1 treatment C2) used PJ 4 : CP 3 : CC 1, total 8 kg/ha, with 5 g of Rhizobium (RRI strain) inoculant per kg of seed.

Tea bushes covering a hillside
Tea, rubber and coconut each sit on different soils, so rates are set crop by crop.

SoilBoost EA on rubber, coconut, and tea soils

SoilBoost EA is a Leonardite-derived humic acid soil conditioner manufactured exclusively for Chemiseed Sdn. Bhd. (Malaysia) and Kudzu Seeds Trading. It has pH 3.84 and 0.45% sulfur as sent (25.81% sample moisture), equivalent to 0.61% on a dry-weight basis. Typical analysis. A certificate of analysis for the batch supplied is available on request. On the acidic, leached soils common across the Sri Lankan wet zone and tea highlands, a humic acid conditioner supports soil condition and structure. 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.

Request availability and quote for Sri Lanka

Chemiseed supplies buyers worldwide on request, from Malaysia, on a quote-only basis. Sri Lankan plantation companies, cooperatives, and importers can request a quotation. Availability and lead time are confirmed per enquiry based on species, volume, and shipment terms.

Request availability and quote for Sri Lanka

Or message us directly: WhatsApp +60 17-237 4058. See also how can we help for the right intake form.

Trust and seed quality

Chemiseed cover crop seed lots are tested to ISTA and AOSA methods for germination and purity. Chemiseed exports from Malaysia, so where the destination requires one, consignments travel with a phytosanitary certificate issued by the Department of Agriculture Malaysia (DOA) for export, on request. Sri Lankan import permits and admissibility remain the buyer's responsibility. Spec sheets and certificates of analysis are available on request via the document center.

For Philippine enquiries, see our Philippine sister company Kudzu Seeds Trading (KudzuSeeds), which is BPI-permitted in the Philippines.

Frequently asked questions

Which cover crops are used in Sri Lankan rubber estates?

Pueraria species have a long history in Ceylon rubber ground cover. Pueraria javanica is sown from seed; the recommended seeding rate is 10 kg/ha sown alone, drilled or planted in holes (Chemiseed recommendation, 2026 catalogue). Centrosema pubescens is added as a shade-persistent successor as the canopy closes.

What cover crops are suited to coconut estates?

Mucuna bracteata has been documented in coconut systems for biomass and persistence. Pueraria javanica is also used for inter-row ground cover in coconut. Species fit depends on the spacing and management plan.

What does SoilBoost EA do?

SoilBoost EA is a humic acid soil conditioner that supports soil condition and structure on acidic, leached 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.

How do I get availability and pricing for Sri Lanka?

Chemiseed operates on a quote-only basis. Request availability through the form above or WhatsApp, and we will confirm species availability, lead time, and pricing for your shipment.

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