Taro

Where does Taro grow?

Found in: Afghanistan, Africa, American Samoa, Andamans, Angola, Antigua and Barbuda, Argentina, Asia, Australia, Bangladesh, Barbados, Benin, Bhutan, Botswana, Bougainville, Brazil, Burkina Faso, Burundi, Cambodia, Cameroon, Canada, Caribbean, Caroline Islands, Central Africa, Central African Republic, CAR, Central America, Chad, China, Chuuk, Colombia, Comoros, Congo DR, Cook islands, Costa Rica, Côte d'Ivoire, Cuba, Dominican Republic, East Africa, East Timor, Easter Island, Ecuador, Egypt, Equatorial-Guinea, Eswatini, Ethiopia, Fiji, French Polynesia, FSM, Gabon, Gambia, Ghana, Grenada, Guam, Guatemala, Guiana, Guianas, Guinea, Guinée, Guinea-Bissau, Guyana, Haiti, Hawaii, Himalayas, Honduras, India, Indochina, Indonesia, Italy, Ivory Coast, Jamaica, Japan, Kenya, Kiribati, Korea, Laos, Liberia, Madagascar, Malawi, Malaysia, Maldives, Mali, Mariana Islands, Marquesas, Marshall Islands, Mauritius, Mediterranean, Micronesia, Mozambique, Myanmar, Nauru, Nepal, New Caledonia, Nicaragua, Niger, Nigeria, Norfolk Island, North Africa, North America, Northeastern India, Pacific, Pakistan, Palau, Papua New Guinea, PNG, Paraguay, Peru, Philippines, Pohnpei, Polynesia, Portugal, Rotuma, Rwanda, Samoa, Sao Tome and Principe, SE Asia, Senegal, Seychelles, Sierra Leone, Sikkim Singapore, Slovenia, Solomon Islands, South Africa, Southern Africa, South America, South Sudan, Spain, Sri Lanka, St Helena, St Lucia, St. Vincent and Grenadines, Sudan, Suriname, Swaziland, Tahiti, Taiwan, Tanzania, Thailand, Tibet, Timor-Leste, Tokelau, Togo, Tonga, Turkey, Tuvalu, Uganda, Uruguay, United States, Vanuatu, Vatican, Venezuela, Vietnam, Wallis & Futuna, West Africa, West Indies, West Papua, West Indies, Yap, Zambia, Zimbabwe

Notes: Leaf stalks have 3.1 mg per 100 g dry weight and 1.7 mg fresh weight of alpha-tocopherol (Vitamin E). There are 8 Colocasia species. Taro tru Taro tru (Colocasia esculenta ). This taro is grown by most people in the Southern Highlands even if only in small numbers. It needs to have a fertile soil, so people grow it around houses where they can compost their rubbish. In Tari they grow it on the fertile soil that they have dug out of the drains. Other people grow it in the moist fertile corner of their garden. The leaves and the underground corm are eaten. It is replanted from the top piece of the corm, It suffers badly from the black taro beetle and its larvae which eat the corm. Fortunately the two serious diseases that are ruining many taro crops on the coast (taro blight and taro virus) do not cause damage in the Southern Highlands. Taro tru can be recognised because the leaf stalk joins onto the centre of the leaf blade.

Growing Taro

Cultivation: Taro can be planted from cormels or from the top of the central corm. Other sections of the corm could also be used but this is not commonly done. Flowering of taro and seed production can lead to new cultivars. Flowering can be promoted by the use of gibberellic acid. The general growth pattern is for an increase in top growth, in terms of leaf number, leaf area and petiole length, to continue for about 6 months under tropical lowland conditions then for each of these to decrease and tuber storage to continue to increase. Corm weight increases significantly from 5 to 11 months. Starch content also increases with time but protein content declines over the corm development period. Taro can be grown under flooded conditions but root rots develop if the water becomes stagnant. For flooded cultivation, the land is cleared, ploughed, cultivated and puddled. The aim is to get a field that is flat with embankments allowing the impounding of water. Planting is done into 2-5 cm of standing water. For dryland taro, the soil is prepared by digging, unless a fresh bush fallow is used where the natural friability of the soil allows plants to be put into the undug soil in a small hole that is prepared. Plants are put into a hole 5-7 cm deep or deeper. Mulching to conserve moisture and reduce weed growth in beneficial. Setts from corms normally give higher yield than that from cormels. The greater leaf area and root production may be responsible for this. Setts of about 150 g are optimum. The time of planting is primarily determined by the availability of moisture. Planting is done shortly after the rainfall has become regular, if seasonally distinct wet and dry seasons occur. Higher rainfall, higher temperatures, and higher hours of sunlight, enhance production and determine seasonality of production. Evapotranspiration for flooded taro averages about 4 mm per day, ranging from 1.5 to 7.2 mm, with a total of about 1200 mm for the crop. Intermittent moisture can result in irregular shaped corms. Flooding has been found to be more effective than sprinkler irrigation, or furrow irrigation. Increased suckering, giving greater leaf area, seems to be the reason for this. Taro is sensitive to weed competition throughout most of its growth, but it is more critical during early growth up to 3 - 4 months. About 7-9 weedings are required, to keep the crop clean under tropical lowland conditions, where flooding is not used. Due to the decrease in height and leaf area towards the end of the growth cycle when starch accumulation in the corms is maximum, weed competition and weed control are again significant. Mechanical weeding needs to be shallow to avoid damaging the superficial taro roots. A range of herbicides have been recommended in various situations. Taro produces the highest dry matter yield under full sunlight, but it can still grow under moderate shade. Under shaded conditions it grows more slowly and develops less cormels. They require good moisture conditions and have little tolerance for drought. Taro residue has an allelopathic factor which can reduce the germination and growth of other plants, for example, beans. Taro tends to demand high fertility, and is responsive to additional NPK fertiliser. Higher doses of K increases starch content and higher doses of N increases protein content. Both N and K applications increase oxalic acid content of the tubers. Spacing affects total yield, and marketable, harvestable yield, of corms. Close spacing increases the corm yield per area, and the shoot yield per area, but decreases the corm yield per plant, and the contribution of sucker corms, to the yield. Where spacings of 30 cm x 30 cm are used, giving about 110,000 plants per hectare, a very large amount of planting material is required, which reduces the net return per unit of planting material. A spacing of 60 cm x 60 cm in more common. Wider spacings of 90 cm x 90 cm reduces overall yield.

Production: Crops mature in 6-18 months. Yields of 5-15 tonnes per hectare are probably average.

Nutrition Info

References

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