Cover crops for Philippine sugarcane (Negros)
Kudzu Seeds Trading supplies tropical legume cover crops and SoilBoost EA soil conditioner to Philippine sugarcane growers in Negros Occidental, Negros Oriental and other Sugar Regulatory Administration districts. Cover crops in the replant interval and on contour strips can help rebuild organic matter on acidic Negros soils and are one of the levers against ratoon decline driven by compaction and low soil biology.
At a glance
- PH role: Negros Occidental and Negros Oriental together form the country's main sugar-producing area.
- Other regions: Tarlac, Pampanga (Luzon), Iloilo, Batangas, Bukidnon, Davao del Sur.
- Institution: The Sugar Regulatory Administration regulates the Philippine sugarcane sector.
- Soil context: Negros soils trend acidic with high aluminium saturation; ratoon decline is often correlated with soil compaction and low organic matter.
- Primary species: Calopogonium mucunoides (CM) and Pueraria javanica (PJ) for replant break crops; Centrosema pubescens (CP) for headlands and contour strips.
Why cover crops matter for sugarcane in the Philippines
Negros sugarcane sits on a mix of inceptisols and acidic Ultisols. After several ratoons, organic matter declines, infiltration drops and compaction from harvest traffic builds up. Growers see this as ratoon decline, the yield erosion crop after crop on the same stool. The agronomic levers are well known: shorten the ratoon cycle, deep-rip during replant, return trash and use a legume break crop in the replant fallow window.
The first use of cover crops in sugarcane systems is a legume fallow between the last ratoon and the new plant cane. Calopogonium mucunoides is a fast pioneer on acidic soils and produces biomass to fold back at land preparation; it covers the soil 3 to 6 months after sowing, sooner on newly cleared fertile land (PROSEA 11), so the length of the fallow decides how much green matter there is to return. Pueraria javanica provides similar service on better soils.
The second use is contour strips and headlands. On rolling Negros terrain, Centrosema pubescens left on contour bunds and roadside strips can slow runoff and help rebuild soil where cane rows do not reach.
Recommended species for Philippine sugarcane
Calopogonium mucunoides (CM)
Aggressive pioneer for the replant fallow window on acidic Negros soils. Broadcast; the seeding rate is confirmed on the quotation. It covers the soil 3 to 6 months after sowing, sooner on newly cleared fertile land (PROSEA 11). Folds back as green manure at land preparation, adding biomass and biological nitrogen.
Replant break crop / broadcast
Pueraria javanica (PJ)
Sown alone, the published rate is about 4 kg per hectare (Tropical Forages). Strong replant break crop on better Negros and Tarlac soils; produces high green-matter return when ploughed in.
Replant break crop / broadcast
Centrosema pubescens (CP)
Broadcast, the published rate is 3 to 5 kg per hectare (Tropical Forages). Persistent legume for headlands, contour bunds and roadside strips around cane fields; helps rebuild organic matter on undulating land.
Headlands and contours / broadcast
Mucuna bracteata (MB)
Used selectively on long-fallow blocks or estate slopes where heavy biomass and erosion protection are needed. Raised as nursery seedlings and transplanted, not broadcast: MPOB TT No. 501 (oil palm) used about 320 seedlings per hectare, two per palm point, raised from about 500 seeds (75 g); the quantity for a cane block is confirmed on the quotation. Measured at 67 to 84 percent of nitrogen taken from the air under three-year-old oil palm on Jawa Series soil in Malaysia (15N isotope dilution; Cheah et al. 2010).
Long fallow / transplanted, not broadcast
Calopogonium caeruleum (CC)
The published rate is 1 to 1.5 kg per hectare sown with 5 to 7.5 kg per hectare of PJ (Tropical Forages). Useful in mixes for slope protection on the steeper edges of cane blocks, particularly in central Negros, and the species most likely to persist as shade increases.
Slope protection / in a mix with PJ
SoilBoost EA
Leonardite-derived humic acid soil conditioner, with 0.45 percent sulphur and pH 3.84. Broadcast 50 to 100 kg/ha or drench 10 to 15 kg/ha. A soil conditioner, not a fertiliser and not a substitute for one. Manufactured exclusively for Chemiseed Sdn. Bhd. and Kudzu Seeds Trading.
Amendment / not a fertiliser
PH-specific establishment timing
Philippine sugarcane in Negros runs on a milling-season calendar, typically September to May or June, with replanting in the wet months. Legume break-crop timing follows the wet-season onset.
- Replant fallow (Negros, Iloilo, Bukidnon): after the final ratoon harvest in April to June, broadcast CM or PJ at the first sustained rains. Hold the legume cover for as long as the replant schedule allows (CM covers the soil 3 to 6 months after sowing, PROSEA 11), then plough or rotary-till at land preparation for the next plant cane crop.
- Tarlac and Pampanga: establish in May to July at the southwest monsoon onset. The Type I climate gives a sharp dry-to-wet transition that suits CM and PJ.
- Headlands and contour strips: establish CP at the same wet-season onset; as a perennial it can persist for several seasons where it is not cultivated, with gaps reseeded as needed.
Negros sits in the central Visayas typhoon corridor. A well-rooted legume break crop helps hold soil through the August to November storms, compared with bare fallow ground or volunteer weeds.
Common challenges in Philippine sugarcane
- Acidic soils and aluminium saturation across central and southern Negros. CM is the standard pioneer on these blocks.
- Ratoon decline driven by organic matter loss and compaction. A legume break crop in the replant interval is one of the agronomic levers against it.
- Harvest-track compaction. Field traffic during the milling season compacts inter-row soils; an established legume cover plus an off-season SoilBoost EA application can help rebuild structure.
- Nitrogen supply. What a legume break crop leaves for the following plant cane crop varies widely by site. Legume cover contributes nitrogen; adjust your fertiliser programme only after soil and leaf analysis shows what the cover supplies on your block.
- Slope erosion on rolling Negros blocks. Contour-strip Centrosema and Calopogonium caeruleum help hold topsoil between cane rows.
Frequently asked questions
Which cover crop is best for Philippine sugarcane replant fallow?
Calopogonium mucunoides is the usual fast pioneer for a break crop on acidic Negros soils, and Pueraria javanica works on better soils. The published PJ rate sown alone is about 4 kg/ha (Tropical Forages); the CM rate and any mix are confirmed on the quotation. Both are folded back at land preparation, returning green matter and biological nitrogen for the next plant cane crop.
How long should the legume break crop stay in the field?
As long as the replant schedule allows. Calopogonium mucunoides 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); a shorter fallow still returns some green matter, but less. Fit the fallow inside the inter-crop window so it does not delay the next milling cycle.
How much Mucuna bracteata seed do I need?
Mucuna bracteata is raised as nursery seedlings and transplanted, not broadcast, so kilogram-per-hectare rates quoted for other species do not apply to it. MPOB TT No. 501 (oil palm on peat) used about 320 seedlings per hectare, two per palm point, raised from about 500 seeds (75 g), and Samedani et al. (2015) used 680 seedlings per hectare on mineral soil. The quantity for your blocks is confirmed on the quotation.
How does SoilBoost EA help Negros sugarcane?
SoilBoost EA is a humic acid soil conditioner derived from Leonardite, with 0.45 percent sulphur and pH 3.84. On acidic Negros soils it is used to support soil structure and biology. Broadcast at 50 to 100 kg/ha at land preparation, or drench at 10 to 15 kg/ha along the row. It is a soil conditioner, not a fertiliser replacement, and response varies by soil, so trial it on a limited area first.
Can I grow cover crops on contour strips between cane blocks?
Yes. Centrosema pubescens, broadcast at the published rate of 3 to 5 kg/ha (Tropical Forages), is a persistent legume for contour bunds, headlands and roadside strips. It can help rebuild organic matter where cane rows do not reach and slow runoff on rolling Negros terrain.
Do you deliver seed to Negros and other SRA districts?
Yes. Seed is shipped from Davao City, Philippines, and freight to Negros and other SRA districts is confirmed on the quotation. Export shipments carry a phytosanitary certificate issued by the Bureau of Plant Industry (BPI); documents for inter-island shipments are confirmed on the quotation. Bulk quotations are available for SRA-registered mills, district associations and cooperatives.
Related pages
Request a Philippine sugarcane cover crop quotation
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Kudzu Seeds Trading is the Philippines-based sister company of Chemiseed Sdn. Bhd. in Malaysia (chemiseed.com). SoilBoost EA is manufactured exclusively for Chemiseed Sdn. Bhd. and Kudzu Seeds Trading.
Sources for the seeding, establishment and nitrogen figures: Tropical Forages, CIAT and ILRI (2020), tropicalforages.info; PROSEA 11, Auxiliary plants (Chen Chin Peng and Aminah, 1997); MPOB TT No. 501 (Hasnol Othman, Farawahida Mohamad Darus and Zulkifli Hashim, 2012); Samedani et al. (2015), International Journal of Agriculture and Biology 17(2): 251-260; Cheah, Zaharah and Aminuddin (2010), Oil Palm Bulletin 60: 22-27.
Last reviewed 10 October 2026.