Economic Significance of Sweet Potato and Colocasia in Agriculture

Two root crops that rarely get the spotlight they deserve – sweet potato (Ipomoea batatas) and colocasia (Colocasia esculenta, also called taro or arvi) – are quietly powering food security, rural livelihoods, and industrial supply chains across the developing world. Together, they represent far more than everyday vegetables. They are economically strategic crops with deep nutritional value, remarkable industrial utility, and an expanding role in global agriculture.

Sweet potato: a global staple with industrial muscle 🔗

According to the International Potato Center (CIP), sweet potato is the sixth most important food crop in the world after rice, wheat, potatoes, maize, and cassava – and in developing countries, it climbs to fifth place. More than 105 million metric tons are produced globally each year, with 95% grown in developing countries. In 2020, global production reached 89 million tonnes, led by China with 55% of the world total, while secondary producers included Malawi, Tanzania, and Nigeria.

These numbers reflect not just volume, but dependency. Many of the developing world’s poorest producers and most undernourished households depend on roots and tubers – including sweet potato – as a critical source of food and nutrition. The crop’s resilience makes it especially valuable: it can grow at altitudes ranging from sea level to 2,500 meters, requires fewer inputs and less labor than crops such as maize, and tolerates marginal growing conditions including dry spells and poor soil.

Starch and sugar: the economic core 🔗

The economic value of sweet potato is inseparable from its composition. Starch accounts for about 50% to 80% of the dry weight of sweet potato roots, making it an ideal raw material and energy crop. This starch concentration is what drives its demand beyond the dinner table. Countries such as Taiwan, China, Korea, and Japan use sweet potato starch as a raw material for several industrialized products including beverages, industrial alcohol, ethanol, and sweeteners.

Sweet potato starch is commercially utilized for the production of commodity chemicals like citric acid, monosodium glutamate, and microbial enzymes. It is also transformed into sugar syrups used in various processed food items, or to make vermicelli, traditional noodles, and thickening agents. In Japan, orange and purple-fleshed sweet potatoes are utilized commercially to produce natural beta-carotene and anthocyanin colors for drinks and other food products.

Alcohol and biofuel production 🔗

Sweet potato’s starch-rich profile makes it a promising feedstock for fuel production. Sweet potato provides raw materials for starch and starch-derived food, biofuel, and industrial products. The starchy content of sweet potatoes can be fermented and converted into bioethanol, which can be used as a renewable fuel source or as an ingredient in the production of alcoholic beverages. Research confirms that sweet potato carries a higher starch yield per unit of cultivated land than cereal grains, giving it a competitive edge in bioenergy applications.

Beyond fuel, sweet potato starch can be used to produce biodegradable plastics, adhesives, paper, and textiles – an emerging industrial frontier that could dramatically expand the crop’s commercial footprint in the coming decades.

Nutritional and medicinal value 🔗

Baked sweet potato is 76% water and 21% carbohydrates, and in a 100-gram serving provides rich contents of vitamin A (120% of daily value) and vitamin C (24% of daily value). Research indicates that bioactive compounds such as β-carotene, anthocyanins, polyphenols, and phytochemicals can reduce cardiovascular disease risk and have antidiabetic, anti-inflammatory, antimicrobial, anticancer, anti-obesity, antioxidant, and hepatoprotective effects.

The orange-fleshed varieties deserve particular attention from a public health standpoint. Just 125g of fresh roots from most orange-fleshed varieties contain enough beta-carotene to meet the daily pro-vitamin A needs of a preschooler, making the crop a low-cost intervention against vitamin A deficiency in vulnerable populations.

Sweet potato starch is also suitable for producing resistant starch, which helps reduce postprandial blood glucose levels and lowers the risk of obesity and diabetes. This property has boosted its appeal in the functional foods and nutraceuticals sector.

Sweet potato as animal feed and its environmental edge 🔗

Sweet potato’s value extends to livestock farming. It is used for both human consumption and as a healthy, cheap source of animal feed. Recent studies suggest that animals fed on high-protein sweet potato vines produce less methane gas than with other feed, potentially contributing an important reduction in harmful global emissions. This dual role – food and feed, with environmental benefits – positions sweet potato as a genuinely multifunctional crop for sustainable agriculture.

Colocasia: the ancient crop with modern economic relevance 🔗

Colocasia esculenta – known widely as taro or arvi – is one of the oldest cultivated crops and an important source of dietary energy worldwide. It is widely grown in the tropics and subtropics for its edible corms and leaves, and serves as an important staple for strengthening food security among poor rural populations in Africa, Asia, and the Pacific Islands. According to FAO data cited in Academic Journals of Plant Breeding and Crop Science, global taro production averages around 10.1 million tonnes on 1.4 million hectares.

What parts of the plant are used? 🔗

Colocasia is a zero-waste crop. Taro stands out as a root crop with zero waste since every part of the plant, including the leaves, peel, and root, can be utilized. The corms are the primary commercial product – they are the main edible parts with high economic potential, serving as an excellent source of starch, sugars, proteins, fibers, and minerals. The leaves and petioles are also consumed as vegetables and are widely used in cuisines across Asia, Africa, and the Pacific. In many parts of Sub-Saharan Africa, the leaves serve as a protein-rich complement to the carbohydrate-dense corms.

High yield potential and adaptability 🔗

From an agricultural economics standpoint, colocasia offers strong yield potential relative to its input requirements. Its ability to tolerate a wide range of humid tropical conditions with variable rainfall patterns makes it a reliable crop in regions with unpredictable weather. Certain varieties also demonstrate resilience to drought and saline soil conditions, making the crop especially important in the context of climate change adaptation.

In areas frequently affected by cyclones, floods, and prolonged dry spells, taro serves as a dependable food source when staple cereals like rice, wheat, and maize fail. This reliability underpins its economic importance in disaster-prone agricultural systems, where crop failure can mean severe income loss for smallholder farmers.

Nutritional composition and food security role 🔗

Taro corms contain 85-87% starch on a dry matter basis, along with minerals, vitamin C, thiamin, riboflavin, and niacin – nutritional quality that is better than many cereals. Taro is a source of thiamin, riboflavin, iron, phosphorus, zinc, and a very good source of vitamin B6, vitamin C, niacin, potassium, copper, and manganese. Its leaves are equally valuable: the high protein content of the leaves favourably complements the high carbohydrate content of the corms.

Taro is easily digestible – 85-87% of its starch is digestible – and due to this property, it is used in the production of infant foods and is highly suitable for people with digestive difficulties. This makes it not just a staple but a therapeutic food, particularly for vulnerable groups including infants, the elderly, and those with gastrointestinal conditions.

Industrial and medicinal significance 🔗

Taro starch offers significant health benefits including blood sugar regulation, digestive health support, and a rich supply of essential minerals and antioxidants. Its ability to enhance the nutritional value of food products, along with its favorable physicochemical properties, makes taro starch a versatile and valuable addition to food formulations. Taro has been identified as a future smart food under the category of underutilized roots and tuber crops to combat chronic malnutrition and hidden hunger in Asia.

On the medicinal front, taro contains bioactive compounds with antioxidant, anti-inflammatory, hypoglycemic, and cholesterol-lowering properties, suggesting potential in managing chronic diseases. Its gluten-free nature supports its use in baby foods, baked goods, and functional beverages, making it a practical ingredient for the rapidly growing functional food industry.

Economic role in rural livelihoods 🔗

Millions of people living in developing countries in Asia, Africa, and Central America utilize taro as a staple or subsistence food, and it plays a crucial role in food security, nutritional security, livelihood improvement, and employment generation. Despite this, the crop remains underutilized in commercial terms. Compared to global staples like maize, rice, and potato, taro receives limited attention in international food security policies and research investments – a gap that hampers its promotion as a climate-resilient, nutrient-rich crop.

Comparing the two crops: complementary strengths 🔗

Sweet potato and colocasia occupy overlapping but distinct economic niches. Sweet potato’s high starch content and broad industrial applications – from alcohol to bioplastics – give it a larger footprint in commercial agriculture. Colocasia, by contrast, derives its economic strength from its nutritional density, zero-waste utilization, and adaptability to environments where other crops struggle. Both crops are deeply embedded in the food cultures of tropical and subtropical regions and serve as critical safety nets for smallholder farming systems.

What unites them is their outsized contribution relative to the limited investment they receive. The importance of sweet potato as a food crop is growing rapidly in some parts of the world – in Sub-Saharan Africa, it is outpacing the growth rate of other staples. A similar trajectory is possible for colocasia if research, processing infrastructure, and policy attention are directed toward unlocking its potential. A 2025 review published in Frontiers in Nutrition notes that greater efforts are needed to expand the global market for taro-based products and minimize post-harvest losses – a challenge that, if addressed, could substantially increase the crop’s economic contribution.

The road ahead for both crops 🔗

Both sweet potato and colocasia are well-positioned to play larger roles in the global food economy – especially as climate change puts pressure on conventional staples. Their tolerance to marginal conditions, rich nutritional profiles, and diverse end uses make them candidates for expanded cultivation and value-addition. U.S. sweet potato exports grew by over 1,100% in value from 2001 to 2021, driven partly by promotion of its health benefits and expanding product offerings – a commercial success story that other countries could replicate. For colocasia, the untapped potential in processed and functional food markets remains a significant opportunity waiting for investment and innovation.

What do you think? Given that both sweet potato and colocasia thrive in conditions where major cereals often fail, should they receive greater priority in national food security policies and agricultural research budgets? And with sweet potato’s proven potential as a biofuel feedstock, how much should developing countries invest in its industrial processing alongside its role as a food crop?

References

1. https://cipotato.org/sweetpotato/sweetpotato-facts-and-figures/
2. https://springerplus.springeropen.com/articles/10.1186/2193-1801-2-493
3. https://academicjournals.org/journal/JPBCS/article-full-text/4D7BF5270199
4. https://www.frontiersin.org/journals/nutrition/articles/10.3389/fnut.2025.1640156/full