By Pukhram Bhumita, Dwipendra Thakuria & Anupam Mishra
Wetlands are among the most productive ecosystems on Earth, serving as natural reservoirs of water, biodiversity, nutrients and food. They regulate floods, recharge groundwater, store carbon, support fisheries and provide habitats for numerous plant and animal species. Their contribution to agriculture extends beyond water availability: wetlands sustain traditional crops, provide nutritious foods, support rural livelihoods and offer opportunities for climate-resilient farming.
The Global Wetland Outlook 2025 reports that at least 22% of global wetlands have been lost since 1970, while the remaining wetlands continue to decline. This highlights the urgent need to conserve wetlands while exploring sustainable ways to support the communities that depend on them. India also has an extensive diversity of wetland ecosystems. National wetland mapping by the Space Applications Centre of the Indian Space Research Organisation has estimated approximately 16.89 million hectares of wetlands, equivalent to about 5.12% of the country’s geographical area, in its assessment.
Loktak Lake: A Living Example of Wetland Agriculture
Manipur provides a remarkable example of the close relationship between wetlands, agriculture and traditional livelihoods. Loktak Lake, the largest freshwater lake in Northeast India, covers approximately 287 square kilometres according to the Loktak Development Authority. Designated as a Ramsar Site in 1990, it is internationally recognised for its ecological importance and unique floating vegetation ecosystem. The lake is characterised by phumdis, floating masses composed of vegetation, soil and organic matter at different stages of decomposition. These floating formations support distinctive habitats and are closely associated with the livelihoods and cultural traditions of local communities. The lake also supports fisheries, aquatic vegetation and the endangered Sangai deer, which inhabits Keibul Lamjao National Park. Water pollution, changes in hydrology, habitat disturbance and the spread of invasive aquatic weeds pose serious challenges. Conservation must therefore combine ecosystem protection with sustainable livelihood opportunities. Loktak’s floating landscape also provides inspiration for carefully designed floating vegetable nurseries, without damaging natural phumdis or sensitive wildlife habitats.
Wetland Suitable Crops: Nutrition, Biodiversity and Livelihoods
The wetlands of Manipur support a valuable diversity of aquatic and semi-aquatic crops that are well adapted to wetland conditions. These crops contribute to food security, nutritional diversity, traditional knowledge and household income. Lotus (Nelumbo nucifera), valued for its rhizomes and seeds, provides carbohydrates, dietary fibre, minerals and plant-based protein. Foxnut (Euryale ferox) produces nutrient-rich edible seeds containing carbohydrates and protein, while water chestnut (Trapa spp.) provides energy, dietary fibre and minerals. Water lilies (Nymphaea spp.) contribute to wetland biodiversity and, where traditionally consumed, form part of local food practices.
Water spinach (Ipomoea aquatica) is a nutritious leafy vegetable rich in dietary fibre, vitamins, minerals and beneficial plant compounds. Water mimosa (Neptunia oleracea), valued for its tender shoots, is another traditional vegetable that contributes to dietary diversity.
Traditionally, many wetland-adapted crops were integral to the diets of people in Manipur. However, their consumption is gradually declining as introduced vegetables become increasingly popular. These crops provide varying amounts of energy, plant-based protein, vitamins, minerals and dietary fibre, with their nutritional composition depending on the species, edible plant part, growing conditions and preparation methods. Incorporating them into diverse diets can complement staple foods and strengthen local nutrition security. Promoting their sustainable cultivation and consumption can also preserve traditional food knowledge, conserve wetland biodiversity and protect valuable genetic resources. Thus, conserving and encouraging the cultivation and marketing of indigenous wetland crops is not merely a means of safeguarding biodiversity; it is also an investment in nutritious food, cultural heritage and sustainable livelihoods, creating income opportunities for farmers and wetland-dependent communities.
Floating Vegetable Cultivation: An Opportunity for Sustainable Agriculture
Floating-bed cultivation offers an innovative approach to raising vegetables and seedlings in areas where conventional agricultural land is limited or seasonal flooding affects nursery operations. Inspired by floating agricultural landscapes associated with Loktak Lake and traditional floating gardens elsewhere, such systems could be evaluated in selected, ecologically suitable locations in Manipur. Lightweight frameworks made from bamboo and suitable biodegradable materials can be used to construct stable floating platforms for raising leafy vegetables and short-duration crop seedlings. Potential benefits include improved use of available space, flexible nursery management, reduced exposure to temporary waterlogging and opportunities for seasonally adjusted production. However, floating beds should be introduced only in ecologically suitable areas following scientific assessment to ensure that they do not disturb natural wetlands, obstruct water flow or damage sensitive habitats.
Water Hyacinth: An Environmental Challenge and a Potential Resource
Water hyacinth (Eichhornia crassipes) is a rapidly growing invasive aquatic plant that poses a serious challenge even in the wetland areas of Manipur, particularly Lamphelpat. Its excessive proliferation forms dense mats, obstructs waterways, interferes with fishing and navigation, reduces light penetration and disturbs aquatic biodiversity, affecting both wetland ecology and local livelihoods. Experiences from other regions demonstrate its potential as an agricultural resource. In Bangladesh, traditional floating agriculture uses water hyacinth to construct floating beds for growing vegetables and raising seedlings in flood-prone areas (Irfanullah et al., 2008; FAO, 2015). Scientific studies have also demonstrated the potential of processed water hyacinth for compost production and as a growing medium for vegetable seedlings (Mazumder et al., 2020). These established practices offer opportunities to utilise harvested water hyacinth biomass in Manipur for floating bed construction and organic nursery media. Appropriate processing and contaminant assessment are essential for safe use. Adapting these practices could help reduce excessive weed accumulation, support sustainable vegetable production and promote a circular, nature-based agricultural system.
Integrating Wetland Conservation with Sustainable Agriculture
Sustainable wetland management calls for a careful balance between ecological conservation and the responsible use of natural resources. Several complementary strategies can help achieve this goal. First, indigenous aquatic crops should be conserved through the preservation of seeds and planting materials, sustainable harvesting, community involvement and documentation of traditional knowledge. Second, floating vegetable gardens may be introduced through monitored pilot projects in ecologically suitable areas, ensuring that they complement rather than replace natural wetland vegetation and should not encroach on protected habitats. Third, integrated nutrient and pest management should be promoted to minimise pesticide contamination and excessive nutrient runoff into water bodies. The judicious use of compost, appropriate biological inputs and environmentally sound pest-management practices can support crop production while reducing ecological risks. Finally, collaboration among local communities, farmers, researchers and wetland management institutions is essential for monitoring biodiversity, water quality, crop performance and livelihood outcomes. Through training and participatory research, locally appropriate technologies can be identified and community ownership of wetland conservation strengthened.
Conclusion
Wetlands are essential to sustainable agriculture because they connect water security, biodiversity, nutritious food and rural livelihoods. Manipur’s indigenous wetland crops including lotus, foxnut, water chestnut, water lilies, water spinach and water mimosa represent valuable resources for nutrition security and traditional agricultural heritage. Floating vegetable gardens and the scientifically validated use of harvested water hyacinth biomass offer promising avenues for agricultural innovation. The future of wetland-based agriculture lies in the principle of wise use: deriving sustainable benefits from wetlands while maintaining their ecological character. By integrating indigenous knowledge, scientific innovation and responsible conservation, Manipur can demonstrate how wetlands can continue to nourish people, sustain biodiversity and support resilient agricultural systems for future generations.
