Croton megalocarpus
Scientific classification Edit this classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Rosids
Order: Malpighiales
Family: Euphorbiaceae
Genus: Croton
Species:
C. megalocarpus
Binomial name
Croton megalocarpus
Hutch., 1912

Croton megalocarpus is a tree species in the family Euphorbiaceae. It is indigenous to ten countries in Sub-Saharan Africa, including Somalia, Kenya, Uganda, Democratic Republic of the Congo, Rwanda, Burundi, Tanzania, Malawi, Zambia, and Mozambique.[2]

Botanical information

A fast-growing tree, croton grows up to 36 meters high and reaches maturity after five to seven years. Croton is commonly found in forests and on rural farms as a boundary tree. It is a drought-resistant tree that can survive in harsh climatic conditions and is not browsed by animals. It is a dominant upper canopy tree with a flat crown.

Croton trees have dark grey or pale brown bark and the leaves are long, oval-shaped, with a green upper surface and a pale underside. A prolific seeder, Croton trees fruit twice a year approximately five months after rains in East Africa. Croton nuts develop after the tree flowers, with mature nuts produced in varying amounts throughout the year depending on the region and elevation. Croton nuts contain three dark oblong seeds that are inedible.[3]

Uses

Croton trees play an important role in local ecosystems for shade, wind protection, and soil conservation.[4] The wood from the trees makes good fuelwood and charcoal. The wood is also known for its termite resistance and is used for fence posts and poles in construction. Given their high nitrogen content, the leaves are often used for mulch. Traditional medical uses for croton include the bark, seeds, roots and leaves being used for medicinal purposes such as stomach ailments, malaria, wound clotting, and pneumonia.[5][6]

Recently, croton nuts are being used as a commercial product in local communities in East Africa. Previously a wasted resource, croton has been promoted as a local, more sustainable avenue to biofuel production in place of failed jatropha projects. The nut itself has multiple uses but most well-known is the oil, used to make biofuel or biodiesel.[7] Croton seeds contain approximately 30% oil and a high protein content of 30%. Byproducts from the oil include croton seedcake that can be used in animal feeds due its high protein content. The husks of the nut are processed into fertilizer or as a biomass.

Biofuel

Croton nut oil (CNO) has been promoted for its perceived benefits in combating climate change, greenhouse gas emissions and dependence on fossil fuels. Compared to diesel, CNO is self-lubricating and has a higher flash point making it safer and causes lower exhaust emissions. There is a limited research on the production of biodiesel from CNO but as a biofuel it can be blended in any ratio with or as a replacement for diesel in stationary equipment and generator sets.[8]

Seed cake

Croton seed cake is used in animal feeds. Based on laboratory testing, protein accounts for 25-30% of the croton seed cake compared to comparable seed cakes like canola (18%) and sunflower (20%). Croton seed cake also has lower level of aflatoxin (14%) than cotton and sunflower seeds. In a study published by the Food and Agriculture Organization of the United Nations, incorporating 25% of croton seed cake into chick diets had positive effects on chick growth and health.[9]

Fertilizer

The croton husks are milled for fertilizer. Croton nuts have relatively high nitrogen content comparatively to typical composts and manures.[10] Eco Fuels Kenya (EFK) is making an organic Bio-fertilizer as a soil amendment certified by East Africa Organic Product Standards that includes Azadirachta indica and Warburgia ugandensis which have insect resistant properties.

References

  1. ↑ Hills, R.; Barberá, P. (2020). "Croton megalocarpus". IUCN Red List of Threatened Species. 2020: e.T62003321A62003323. doi:10.2305/IUCN.UK.2020-3.RLTS.T62003321A62003323.en. Retrieved 8 June 2021.
  2. ↑ "Department of Botany, University of Wisconsin-Madison: Croton Research Network". Archived from the original on 2017-01-13. Retrieved 2016-02-12.
  3. ↑ "Croton megalocarpus" (PDF). Agroforestree Database: a tree reference and selection guide version 4.0. Retrieved February 1, 2016.
  4. ↑ Roeland Kindt, Jens-Peter B. Lillesø and Paulo Van Breugel (2007). "Comparisons between original and current composition of indigenous tree species around Mount Kenya". African Journal of Ecology. 45 (4): 633–644. doi:10.1111/j.1365-2028.2007.00787.x.
  5. ↑ "Indigenous multipurpose trees of Tanzania". Archived from the original on September 13, 2016. Retrieved February 1, 2016.
  6. ↑ Esther N. Matu; Johannes van Staden (July 2003). "Antibacterial and anti-inflammatory activities of some plants used for medicinal purposes in Kenya". Journal of Ethnopharmacology. 87 (1): 35–41. doi:10.1016/S0378-8741(03)00107-7. PMID 12787952.
  7. ↑ B. Aliyua; B. Agnewb; S. Douglasc (July 2008). "Croton megalocarpus (Musine) seeds as a potential source of bio-diesel". Biomass and Bioenergy. 34 (10): 1495–1499. doi:10.1016/j.biombioe.2010.04.026.
  8. ↑ "Jatropha Reality Check: A field assessment of the agronomic and economic viability of Jatropha and other oilseed crops in Kenya" (PDF). German Technical Cooperation (GTZ). December 2009. Retrieved February 1, 2016.
  9. ↑ Rik Thijssen. "Croton megalocarpus, the poultry-feed tree: how local knowledge could help to feed the world" (PDF). Food and Agriculture Organization of the United Nations. Retrieved February 1, 2016.
  10. ↑ RA.B Kwabiah; N.C Stoskopf; C.A Palm; R.P Voroney (2003). "Soil P availability as affected by the chemical composition of plant materials: implications for P-limiting agriculture in tropical Africa". Agriculture, Ecosystems & Environment. 100: 53–61. doi:10.1016/S0167-8809(03)00171-3.
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