Jute mallow or nalta jute (Corchorus olitorius, also known as "Jew's mallow", "tossa jute", "bush okra", "krinkrin", "molokhia", and "West African sorrel", among many other local names, often invoking the most important traits) is a species of shrub in the family Malvaceae. Together with C. capsularis it is the primary source of jute fiber. The leaves and young fruits are used as a vegetable, the dried leaves are used for tea and as a soup thickener, and the seeds are edible.
Origin and growing area
It is unclear whether Corchorus olitorius originated in Africa or in Asia. Some authorities consider that it comes from the Indo-Burmese area or from India, along with several other related species. Others point out that there is a greater genetic variation in Africa and a larger number of wild species in the genus Corchorus. Wherever it originated, it has been under cultivation for a very long time in both continents and probably grows, wild or as a crop, in every country in tropical Africa.
Corchorus olitorius is an erect herbaceous plant, fairly branched and grows about 1.5 m high. However, if grown for fibre production, it can reach heights up to 4 m. The taproot leads to a sturdy and hairless stem, which is green with a faint red-brownish hue and sometimes turns a little woody on ground level. The serrate acute leaves alternate, are 6 to 10 cm long a and 2 to 4 cm wide. The plant carries the flowers solitary or in two-flowered cymes opposite of the leaf. The flowers sit on the end of a short stem, count 5 sepals, 5 petals and 10 free and yellow stamina. The fruit is spindle-shaped, dehiscent and divided into transversal sections through five valves. The fruit measures 2 to 8 cm in length and colors vary from greyish-blue to green or brownish-black. Every seed chamber contains 25 to 40 seeds, which sum up to 125 to 200 seeds per fruit.
Corchorus olitorius is an annual crop. The plant grows well in the lowland tropics, ranging from warm temperate zones through tropical desert to wet forest life zones. It can tolerate an annual precipitation between 400 and 4290 mm (optimum 1000 mm per year). Some cultivars are sensible to waterlogging, especially when they are young. Temperatures between 16.8 and 27.5 °C are optimal for the plant growth. For the soil a pH of 4.5 to 8.2 is needed. The plant prefers a fertile, humus-rich, well-drained alluvial soil but also grows well in suboptimal soil conditions. Before sowing, the soil is prepared carefully by plowing and the seeds are broadcast or dribbled behind the plow in the wet season. The seeds must be pre-soaked 24 hours before seeding for ten seconds in hot water (around 93 °C) to overcome dormancy. If the small seeds are mixed with sand, it makes it easier to sow them. And if the soil is wet, germination takes place two to three days after sowing. In some systems, the seedlings are transplanted at a height of 10 cm. The plants are grown in rows with a spacing of 20–50 cm. When the plant achieves a height of 8–25 cm, the seedlings are harrowed with a rake three to four times and weeded two to three times. Cow dung, wood ashes or rotted water hyacinth (Eichhornia crassipes) or its ashes are used as manure. The yield of the crop responds more to water availability and soil organic matter than to high mineral nutrient status.
The most serious pests are nematodes from the genus Meloidogyne, leaf-eating beetles and caterpillars. If it is dry, eight to ten weeks after planting, yield losses can occur due to leaf bugs and spider mites attacks resulting in terminal shoot wilt. Damage by nematodes can be minimized by crop rotation. Application of insecticides is also possible, but agent and application time should be chosen carefully since the leaves are harvested for consumption. Attacks were also observed by weevils species (Myllocerus spp.), semilooper (Anomis sabulifera), and yellow mites (Polyphagotarsonemus latus). Diseases (bacterial and viruses infections) are not as serious as pests (insect and nematode attacks). Seedling damp-off occurs but can be reduced by good drainage and cultivation in humus-rich soils with adequate water holding capacity. Attacks by Sclerotium rolfsii in dry weather of the late season can lead to wilts at the stem collar. Anthracnose spots caused by Colletotrichum gloeosporioides may infect the crop but can be easily controlled by spraying copper oxychloride.
Harvest and yield performance
Harvest can begin after about six weeks: The whole plant can be directly harvested (for jute production) or leaves are harvested by pruning several times during the vegetation period (for food production). The shoot regeneration highly depends on variety, soil fertility, adequate water supply and control of weeds and pests. Amount of pruned shoots and quality reduces with each harvest. Under farming conditions the yield usually reaches around 2.5 t per hectare of edible leaves. Under experimental conditions and with very high fertility application, yields of about 28 t per hectare have been reported.
Post harvest and propagation
For fresh consumption the leaves should be stored above 8 °C and below 15 °C. Low temperatures from 1-8 °C lead to browning of the leaves and too high storage temperatures are manifested in leaf yellowing. To produce seeds, the fruits can be harvested six weeks after flowering. The dried capsules are threshed and can be stored for eight to twelve months in well sealed jars. For storage, the moisture should be around nine percent.
Corchorus olitorius could be grown in a floating system with nutrient solution and could produce baby leaves, which would be interesting for the fresh cut leafy vegetable industry in Europe.
Most of all the countries India, Bangladesh and other Asian countries make Jute from fibres of the bark tissue of Corchorus capsularis and Corchorus Olitorius, while the fibre of C. Olitorius is of lesser quality. The fibres are extracted from the plant’s bark. They appear golden and silky with a length of up to 3 metres and with a diameter of 2.4 µm. The plant stalk is cut and then processed by pulling up, rippling, partial retting, breaking, spinning and combing to obtain fine fibres that are well separated from unwanted woody material. Afterwards the fibres are cured and dried.
In Africa and the Middle East, a different type is grown with the leaves and shoots being used for food while the fibre is considered of little importance.
Corchorus olitorius is cultivated in Syria, Lebanon, and Egypt as a potherb and its culinary use goes back at least as far as the Ancient Egyptians. It is an important leafy vegetable in Côte d'Ivoire, Benin, Nigeria, Cameroon, Sudan, Uganda, Kenya and Zimbabwe. It is also cultivated and eaten in the Caribbean and Brazil, in the Middle East and in India, Bangladesh, Japan and China. In Nigeria the leaves are boiled to make a sticky, mucilaginous sauce which is served with balls of cassava which are otherwise rather dry.
The edible part of jute is its leaves. Richness in potassium, vitamin B6, iron, vitamin A and vitamin C make this crop particularly important, where people cover a high share of their energy requirement by micronutrient-poor staple crops. This vegetable is predominantly eaten in Africa and Asia. A traditional Tunisian and Egyptian dish made of C.olitorius leaves is Mulukhiyah.
Consumption of the leaves is reported to be demulcent, deobstruent, diuretic, lactagogue, purgative, and tonic. It is also a folk remedy for aches and pains, dysentery, enteritis, fever, pectoral pains, and tumors. Ayurvedics use the leaves for ascites, pain, piles, and tumors. Elsewhere the leaves are used for cystitis, dysuria, fever, and gonorrhea. The cold infusion is said to restore the appetite and strength. It can act anti-inflammatory, it has gastroprotective properties and can be used as an antifertility agent.
A soup containing mushroom and corchorus olitorius, served in Malolos, the Philippines, where the latter vegetable is known as saluyot.
- Duke, James A. (1979-01-01). "Ecosystematic Data on Economic Plants". Quarterly Journal of Crude Drug Research. 17 (3–4): 91–109. doi:10.3109/13880207909065158. ISSN 0033-5525.
- Nyadanu, D.; Amoah, R. Adu; Kwarteng, A. O.; Akromah, R.; Aboagye, L. M.; Adu-Dapaah, H.; Dansi, A.; Lotsu, F.; Tsama, A. (2017-08-01). "Domestication of jute mallow (Corchorus olitorius L.): ethnobotany, production constraints and phenomics of local cultivars in Ghana". Genetic Resources and Crop Evolution. 64 (6): 1313–1329. doi:10.1007/s10722-016-0438-4. ISSN 0925-9864.
- "Plants for future".
- World weeds : natural histories and distribution. Holm, LeRoy G. New York: Wiley. 1997. ISBN 9780471047018. OCLC 34114783.
- "The Plant List: A Working List of All Plant Species". Retrieved 21 May 2015.
- Grubben, G. J. H. (2004). Vegetables. PROTA. ISBN 9789057821479.
- "Corchorus olitorius - TILIACEAE". idao.cirad.fr. Retrieved 2017-12-03.
- "Food Plants international".
- "Corchorus olitorius".
- Duke, J. A. (1978). "The quest for tolerant germplasm [Agricultural crops, resistance, ecosystematics]". ASA Special Publication American Society of Agronomy. 32.
- Buchanan, Rita (1987). A weaver's garden. Interweave Press.
- Oladiran, Johnson A. "Effect of stage of harvesting and seed treatment on germination, seedling emergence and growth in Corchorus olitorius 'Oniyaya'". Scientia Horticulturae. 28 (3): 227–233. doi:10.1016/0304-4238(86)90004-x.
- Akoroda, M. O. (1988). "Cultivation of jute (Corchorus olitorius L.) for edible leaf in Nigeria". Tropical agriculture. 65: 297–299.
- van Epenhuijsen, C.W. (1974). Growing native vegetables in Nigeria. Rome: FAO-UN. pp. 55–57.
- ICAR (1973). The jute - Annual report -1970. The Jute Agricultural Research Institute.
- Tulio, Artemio Z; Ose, Kimiko; Chachin, Kazuo; Ueda, Yoshinori. "Effects of storage temperatures on the postharvest quality of jute leaves (Corchorus olitorius L.)". Postharvest Biology and Technology. 26 (3): 329–338. doi:10.1016/s0925-5214(02)00065-0.
- Giro, Andrea; Ferrante, Antonio (2016-11-01). "Yield and quality of Corchorus olitorius baby leaf grown in a floating system". The Journal of Horticultural Science and Biotechnology. 91 (6): 603–610. doi:10.1080/14620316.2016.1200955. ISSN 1462-0316.
- Carus, Michael (2008). "Studie zur Markt- und Konkurrenz - situation bei Naturfasern und NaturfaserWerkstoffen". Gülzower Fachgespräche.
- "Future Fibres: Jute". www.fao.org. Retrieved 2017-12-03.
- Plumptre, Edward Hayes (1874). The Bible educator, ed. by E.H. Plumptre.
- "Jew's Mallow". www.herbs-info.com. Retrieved 2017-12-03.
- Duke, James (1981). Medicinal plants of the world.
- List, PH (1979). Hager’s Handbuch der pharmazeutischen Praxis. Berlin.
- Nyadanu, D.; Lowor, S. T. (2015-01-01). "Promoting competitiveness of neglected and underutilized crop species: comparative analysis of nutritional composition of indigenous and exotic leafy and fruit vegetables in Ghana". Genetic Resources and Crop Evolution. 62 (1): 131–140. doi:10.1007/s10722-014-0162-x. ISSN 0925-9864.
- Handoussa, Heba; Hanafi, Rasha; Eddiasty, Islam; El-Gendy, Mohamed; Khatib, Ahmed El; Linscheid, Micheal; Mahran, Laila; Ayoub, Nahla. "Anti-inflammatory and cytotoxic activities of dietary phenolics isolated from Corchorus olitorius and Vitis vinifera". Journal of Functional Foods. 5 (3): 1204–1216. doi:10.1016/j.jff.2013.04.003.
|Wikimedia Commons has media related to Corchorus olitorius.|
|Wikispecies has information related to Corchorus olitorius|
- Ya Tang; Michael G. Gilbert; Dorr, Laurence J. (2007), "Corchorus olitorius Linnaeus", Flora of China online, 12