Groundwater Productivity & Efficiency in Punjab Agriculture: Irrigation Advancements, Agronomic Interventions, and Incentives

Abstract

The utilization of groundwater in India, particularly in the irrigation sector, has reached alarming levels, with 87 percent of extracted groundwater being used for irrigation purposes. This heavy reliance on groundwater has led to significant concerns regarding its sustainable management. Despite annual groundwater recharge being reported at 437.60 billion cubic meters (BCM), the volume of extracted groundwater stands at 239.16 BCM, primarily for irrigation (208.49 BCM). The Green Revolution, which intensified the use of water and fertilizers in agriculture, exacerbated this issue. Studies highlight the imminent crisis of groundwater exploitation in India, especially in states like Punjab, Haryana, and Rajasthan, where a high percentage of groundwater units are over-exploited. Factors such as subsidies for electricity and minimum support prices for water-intensive crops have worsened the situation. The imbalance between groundwater supply and demand and poor water resource management exacerbates the crisis. Efforts to address these challenges include enhancing water-use efficiency, particularly in agriculture, where over 80 percent of water is utilized. In Punjab, a state heavily reliant on agriculture, groundwater has become the primary source of irrigation. Despite efforts to reduce dependence on surface water, the state faces challenges due to excessive groundwater extraction. Over-exploitation of groundwater resources has led to adverse effects, including declining water levels and deteriorating groundwater quality. District-wise analysis reveals varying degrees of groundwater exploitation, with some districts experiencing severe over-exploitation. Traditional laws governing groundwater usage, which tie rights to land ownership, have proven inadequate in addressing the issue, leading to overexploitation for personal gain without consideration for broader community needs. Despite this, effective laws to regulate groundwater usage remain lacking. Various regulatory approaches, including command and control (CAC) regulations and market-based incentives, have been employed to manage groundwater usage, each with limitations and advantages. However, there is a growing recognition of the need for community-based, bottom-up approaches to ensure long-term sustainability. The transferability of successful groundwater governance schemes to other regions remains uncertain, emphasizing the importance of considering local contexts and fostering institutional diversity. Evaluating the efficacy of groundwater management policies, such as the Punjab Preservation of Subsoil Water Act 2009 and advocating for holistic approaches that combine regulatory measures with incentives and community participation is crucial to ensure responsible groundwater utilization and long-term sustainability. This study achieves several key objectives related to sustainable groundwater use in Punjab agriculture. First, it assesses the strengths and weaknesses of ‘The Punjab Preservation of Subsoil Water Act’ and evaluates its implementation. Second, the impact of technological interventions on groundwater productivity and efficiency is investigated. Third, the study explores the effects of agronomic interventions on groundwater use. Finally, it proposes a comprehensive groundwater management framework, including incentives for efficient water utilization by farmers. This study utilizes both primary and secondary data from various sources. The primary data collection involves a multi-stage random sampling technique to select sample farmers. Specifically, four districts—Sangrur, Jalandhar, Pathankot, and Bathinda—were chosen due to their distinct groundwater exploitation levels. The target population comprises farmers in these districts who irrigate their crops using tube-wells. Additionally, discussions with farmers provided valuable insights and feedback related to groundwater management and regulations. This study elucidates the concept and measurement methods for water use efficiency (WUE) and economic water productivity (EWP), acknowledging the diverse interpretations across disciplines such as crop physiology, irrigation science, and economics. It provides detailed definitions and formulas for calculating WUE and EWP, emphasizing the importance of distinguishing between the two concepts. Challenges in understanding and measuring WUE and EWP arise from the multidisciplinary nature of the subject, which involves diverse fields such as hydrology, agronomy, economics, and engineering. Each discipline may interpret these concepts differently, leading to variability in terminology and measurement approaches. A comprehensive summary of key determinants influencing crop WUE is provided, drawing from a wide range of global studies. The study discusses the expected impacts of these factors on WUE based on empirical findings, acknowledging the variability in results across different studies. The study outlines the methodology employed to study water efficiency and productivity in Punjab, India, focusing on the selection of variables such as socio-economic, demographic, and agricultural factors. It emphasizes the importance of understanding the complex dynamics of water use efficiency in the region and highlights the role of variables such as farmer demographics, farm size, irrigation infrastructure, and technology adoption in influencing water management practices. The study uses regression model to estimate the factors affecting WUE and EWP of paddy and wheat crops. Resource use efficiency of paddy and wheat crops have also been calculated. Efforts to address water management challenges include the adoption of innovative vi technologies like Micro Irrigation (MI) and laser land leveling (LLL) to conserve groundwater and enhance water use efficiency. MI systems, including drip and sprinkler irrigation, have shown promise in improving water productivity and efficiency. While these technologies offer significant benefits and challenges, such as high equipment costs, the need for skilled operators exists. Observations from field surveys and discussions with farmers in Punjab provide insights into farming practices, irrigation methods, and the adoption of MI systems. Micro-irrigation adoption in Punjab has shown a direct relationship with the expansion of horticultural cultivation in the region. As the physical progress of MI systems increased over the years, it facilitated the growth of horticultural areas, demonstrating the effectiveness of micro-irrigation in supporting sustainable agriculture and enhancing productivity. Farmers are primarily motivated by water, energy, and labor savings when adopting LLL technology. The positive impact of LLL on WUE suggests its potential in addressing the declining water table in Punjab. District-wise analysis shows varying impacts of LLL on crop yield, labor requirements, and energy consumption, with Bathinda exhibiting overall improvements. WUE analysis demonstrates the positive impact of LLL on water utilization, with significant improvements observed across different districts and farm sizes. These findings support the efficacy of LLL in enhancing WUE and suggest its applicability across diverse areas in the state. The dependent two-sample t-test is suitable and used for examining the difference between water use efficiency (WUE) for paddy without and with the use of a Laser Land Leveller (LLL) for both districts and farm sizes. Principal Component Analysis (PCA) further enriches the understanding of constraints hindering the adoption of drip and sprinkler irrigation systems. Economic, technical, and administrative constraints, along with heavy initial expenses and low usefulness in cropping patterns, are identified as key factors influencing farmers' decisions. This nuanced analysis provides valuable insights for policymakers and stakeholders to design interventions tailored to address farmers' specific constraints in adopting water-efficient technologies, ultimately contributing to sustainable groundwater management in Punjab's agricultural sector.