Recycling of leaf litters: Biowaste management for resource conservation

The search for viable agricultural production systems in the era of unpredictable climate events has elevated the prospects of agroforestry practices for resilience and sustainability. The litter biomass in these ecosystems govern the biogeochemical nutrient cycling prevalent, but can also serve as organic inputs in crop production under situations where these are considered as menace and cumbersome to dispose. When left to decay under natural conditions litter takes a considerably long time for decomposition and release of nutrients entrapped in them. With the increasing need to conserve natural resources and energy, recycling of organic wastes assumes major significance. Leaf litters are untapped sources of nutrients and are generated in substantial quantities in most of the agroforestrty systems. Among the different alternatives available for recycling biomass residues, composting is considered most efficient and viable option, but recent innovations such as biochar production and thermochemical digestion have also been attempted. Organic farming strategies call for in situ production of nutrient inputs for economic viability of the practice and hence information on alternative technologies to enrich the repository of organic manures in the form of litter compost will be of immense importance. These composts could be recycled to soil for enriching soil organic carbon, plant nutrients and to sustain soil health in the long run. Proper utilization of the biowastes in the tree based systems will also ensure reduction in environmental pollution and forest fire incidents that otherwise threaten life. The review unveils the possible technologies for recycling the litter and use as a nutrient source but emphasizes the need for a suitable environment favouring the rapid decomposition.