Pesticide Applications and Their Ecological Footprint: Impact on Nutrient Dynamics and Agronomic Health

Abstract

This review provides a compelling examination of the escalating use of pesticides in Indian agriculture, underscoring their profound environmental consequences, particularly regarding soil health and nutrient cycling. Initially modest, pesticide application surged dramatically following the Green Revolution, reaching 266 grams per hectare by 1976, and now represents a staggering 55% of all pesticides utilized. This pervasive reliance raises critical concerns about the persistence of pesticide residues and their environmental fate, involving complex processes such as adsorption, degradation, and transport mechanisms. Notably, despite a significant 27.69% reduction in chemical pesticide use between 1994-1995 and 2001-2002, the risks remain substantial. Research demonstrates that pesticides severely undermine soil fertility and disrupt microbial activity by interfering with essential carbon and nitrogen cycles, altering key enzymatic functions (such as dehydrogenase), and suppressing vital nitrogen-fixing bacteria. For example, glyphosate has been shown to hinder the absorption of crucial micronutrients like iron (Fe) and manganese (Mn), while chlorpyrifos compromises the availability of essential nutrients—such as nitrogen, phosphorus, and potassium (NPK). Furthermore, the availability of zinc (Zn), copper (Cu), and manganese (Mn) is variably affected by other commonly used pesticides, including 2,4-D and endosulfan. To address and mitigate these detrimental effects, this review passionately advocates for the adoption of Integrated Pest Management (IPM) strategies and the transition to organic or bio-based alternatives. While pesticides are undeniably vital for ensuring food security, their judicious and limited application is crucial for safeguarding soil health and promoting sustainable agricultural practices. The time has come to prioritize the health of our ecosystems alongside agricultural productivity, paving the way for a more sustainable future., such as 2,4-D and endosulfan. To lessen these adverse effects and promote decreased toxicity, quicker decomposition, and increased soil biodiversity, the review highlights the importance of Integrated Pest Management (IPM) and the use of organic/bio-based substitutes. Applying pesticides sparingly is essential to preserving soil health and guaranteeing sustainable agricultural production, even though they are vital for food security.