Earthworm Castings in Ecosystem Health through Their Elemental Composition
P. Baskar, Kushal Sachan, Bal Veer Singh, D. R. K. Saikanth, R. K. M. Harish Kumar, Rakhi Gautam, Omkar Singh
International Journal of Plant & Soil Science · pp. 2076–2087 · Published 11 Aug 2023
10.9734/ijpss/2023/v35i183494Abstract
Earthworm castings, colloquially termed as nature's potent organic fertilizers, have emerged as a cornerstone in the pursuit of sustainable agriculture and holistic ecosystem health. This significance is particularly pronounced in the intricate tapestry of India's agricultural landscapes, marked by its rich biodiversity and varied terrains. Drawing from an exhaustive synthesis of research literature and traditional agricultural knowledge unique to India, our review sheds light on the multifaceted attributes of these castings. At the heart of these attributes is the elemental composition of the castings. Rich in both macro (like Nitrogen, Phosphorus, and Potassium) and crucial micronutrients (including Calcium, Magnesium, and Sulfur), these castings present a veritable solution to the challenges of soil fertility. They don't merely replenish the soil; they transform it. By making nutrients more bioavailable, they ensure plants not only grow but thrive, leading to a notable reduction in the need for synthetic fertilizers. This shift not only offers an economic respite to farmers but also mitigates the environmental challenges associated with chemical overloads in soils. Beyond the immediate agronomic advantages, the broader ecological implications of earthworm castings are equally compelling. Our review highlights the critical role these castings play in enhancing soil structure. A robust soil structure, in turn, is fundamental for healthy microbial communities, ensuring that the soil is teeming with beneficial organisms that further its fertility and resist pathogens. Moreover, the ability of earthworm-amended soils to retain more water emerges as a significant boon, especially in the face of erratic monsoons and increasing drought scenarios in parts of India. This water retention capability dovetails with the castings' ability to reduce soil erosion, a concern that has long plagued India's terrains, from its hilly regions to its coastal plains.
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