Economic and ecological transformation through mixed-culture vermicomposting: A nine-year longitudinal case study of vermicomposting adoption in Bageshwar, Uttarakhand

Introduction

Modern agriculture faces two major, simultaneous pressures: to produces enough food to meet the demand for a rapidly growing global population, and it must manage the increasing volume of agricultural waste in an environmentally responsible way. Consequently, the only aim of farming can no longer be limited to high yields; it must also be ecologically sustainable. Nonjudicious and excessive application of inorganic fertilizers and chemicals by farmers to gain higher yields from their agricultural produce is causing serious deterioration in ecosystem health, evident in the loss of soil fertility and disruption of microbial communities, apart from the risk of chemical residues accumulating in the produce for consumption. As noted by Sande TJ et al. 2024 [5] , this calls the attention for Integrated Nutrient Management (INM), which combines various organic and inorganic inputs to maintain soil fertility and environmental quality. This holistic method incorporated FYM, bio-enriched rock phosphate, and vermicompost (produced by earthworms-the 'natural soil engineers'). Vermicompost has superiority in nutrient composition compared to raw farm manure and also often transforms soil quality positively. According to Aira et al. 2016 [1] , vermicompost results from the consumption and processing of raw organic materials by earthworms through their gut. The earthworms also play a role as effective bio-intensifiers, by their persistent physical activities like burrowing and bioamendments like, casting and fluid excretion, which strengthen microbial population and decomposition rate in the composting system and nearby soil. Vermicomposting is therefore a synergetic process with combined actions of earthworms and soil microorganisms in the medium, which cooperatively accelerates the process of decomposition of raw organic matter into fine compost (Ali et al., 2015) [2] . The product of this joint action, vermicompost, thus comprises beneficial bacteria in it along with crop growth nutrients. The vermicompost thus performs as a biological organic fertilizer with promising potential in agriculture (Huang et al., 2013) [3] . This paper is a case study (at the local level) of successful adoption of vermicomposting by one marginal farmer over a period of about Nine years, using combination of high-efficiency earthworm species, E. fetida and E. eugeniae. The selection was done based on the main biological differences and their availability locally. More specifically, E. fetida has a high reproductive rate and is mesophilic (Venter and Reinecke,1988; Nguyen, 2022) [7,4] , while E. eugeniae has the essential advantage of superior resistance to higher temperatures (Vasanthi, K., 2013) [6] . This combination was chosen with the objective of optimizing operational stability.

Case study objective 1. To demonstrate the effectiveness of replacing conventional inorganic fertilizers with organic vermicomposting for nutrient management. 2. To assess how on-site vermicompost production can reduce input costs and improve soil health.

This successful adoption was then leveraged as an inspirational model to encourage neighbouring farmers to assess the financial benefits and the long-term gains of self-sufficiency.

Methodology 1. Study Area:

The case study was conducted in the fields of a farmer, Mr Manoj Bharara Son of Mr Kesar Singh, covering approximately 6 acres in Village Kansyari-Gagrigol, Garur Block, Bageshwar District, Uttarakhand, India.

Materials and Method

a. Earthworm Culture: Two earthworm species were used in this study, E. fetida and E. eugeniae procured from G.B. Pant University of Agriculture and Technology (GBPUAT), Pantnagar, Uttarakhand and were transferred to KVK, Bageshwar (ICAR-VPKAS). for multiplication. After sufficient earthworm biomass was generated, the needbased trainings were provided and earthworms were distributed to the collaborating farmer for introduction into the on-site vermicomposting unit. b. Stocking Density: The stocking density was initiated with 15-20 earthworms per kilogram of substrate. The major feedstock was cattle dung, which was drawn daily from the farmer's own cows, goats, and buffaloes. This was supplemented with other readily available organic material such as daily kitchen wastes, crop residues, and farm discards. The farmer maintained a mixed population of both E. fetida and E. eugeniae species together. Thus, the pits contained a mixed culture, whose proliferation was influenced by the quality and temperature profile of the diverse substrate. c. Unit Structure: The farmer constructed a total of six rectangular vermicomposting pits directly in his field, with uniform dimensions of 10 x 3 x1 ft (Length x Width x Height) and were built with concrete. These were dualpurpose pits: • large-scale multiplication of the introduced earthworm species • Adequate production of vermicompost for its use in the farmer's own field.

Data Collection

Selection was limited to farmers who had successfully completed the training at KVK Bageshwar and were intrinsically motivated for the adoption of vermicomposting as a sole nutrient management strategy, completely replacing inorganic fertilizers. Time-to-time guidance and technical support were provided throughout the study period. A systematic record was maintained on the crop health, overall production, and income generated from the intervention farms that had enabled a robust comparative account on the efficacy and cost benefit analysis of the intervention at farm level.

The scale of observation in the current study is limited to a single farmer's field. A key objective was to successfully establish the selected participant as an exemplary figure in the local peer group to facilitate influence among fellow farmers for the adoption of similar sustainable practice.

Observation

Before intervention, the farmer relied on raw, backyardproduced FYM for nutrient management. This practice frequently attracted insects and pests to the main crops and failing to deliver nutrients from the compost as expected. As a result, there was always a requirement to purchase inorganic fertilizers, which added to his financial burden. Moreover, high local demand for organically produced red rice motivated the farmer to seek a sustainable alternative. After knowledge transfer and practical training on vermicomposting by KVK Bageshwar, the farmer voluntarily decided to adopt vermicomposting and switched to this organic practice for his nutrient management.

Farmer's Production Data

Below are Table 1 and Table 2, with component description along with coverage area and income generated, in both baseline year and year of observation, respectively: The following analysis (Table 3) has been drawn from a comparative study of the performance of the farm over Nine years, comparing the baseline data of 2015-16 with the post-intervention results of 2023-24 to document the comprehensive impact of adopting vermicomposting and associated sustainable practices. A comparative analysis was carried out using baseline data and post-intervention data to quantify the impact of adopting the technology.

Over the Nine-year period, the farmer's net annual income increased from Rs. 208,300 in baseline year (2015-16) to Rs. 476,300 in the year of observation (2023-24). This shows an annual increase of Rs. 268,000, which is close to a two-fold increase in net earnings. These results highlight the strong economic potential of transitioning from conventional chemicalbased nutrient management to a system centred on on-farm vermicomposting.

Results

The financial analysis demonstrates a considerable positive impact of the integrated interventions, including vermicomposting. Net annual income rose from Rs. 208,300 in the 2015-16 benchmark year to Rs. 476,300 in 2023-24, amounting to a near two-fold increase. The income gains were contributed by shifting to high-value enterprises supported by improved soil health and nutrient availability by vermicompost. Over the period of study, net income from mushroom cultivation increased by approximately 1400%, fruits by 1150%, and goat rearing by 700%. These shifts suggest that integrating vermicomposting into the farm system enabled the farmer to successfully diversify and intensify profitable enterprises.

Conclusion

This case study documents a significant transformation in a small-scale farming system in Bageshwar district, Uttarakhand, following the adoption of on-farm vermicomposting. The use of a mixed culture of E. fetida and E. eugeniae formed the core of an Integrated Nutrient Management strategy tailored to local conditions. Together, these species provided a sturdy and adaptable vermicomposting system. Over the study period of Nine years (2015-16 to 2023-24), the farmer's net annual income nearly doubled, from Rs. 208,300 to Rs. 476,300. This shift in income upgradation was closely linked

References

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