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Published July 25, 2026

Evaluation of Tube-well Water Quality for Irrigation Under PQNK

A government laboratory classified both a 500-foot and a 580-foot tube-well sample as unsuitable for irrigation, even though deepening the bore cut salinity by a third and sodium hazard by half. This technical assessment argues that under PQNK's raised-bed, mulch-covered management, the 580-foot water becomes usable, because the soil the water enters, not just the water's chemistry, determines the outcome.

Abstract

The paper works from real laboratory data supplied by the Soil & Water Testing Laboratory, Government of the Punjab, comparing two samples from the same site: one from 500 feet and one after the bore was deepened to 580 feet. The deeper water shows meaningful improvement across every parameter measured, electrical conductivity down about 35%, sodium down roughly 49%, sodium adsorption ratio (SAR) falling from 17.30 to 6.88, and residual sodium carbonate improving from 4.49 to 3.20, yet the laboratory classified both samples as unsuitable for conventional flood irrigation.

The paper accepts the conventional interpretation on its own terms: under repeated cultivation, bare exposed soil, flood irrigation, and high evaporation, water carrying high salinity, sodium hazard, and residual sodium carbonate will progressively degrade soil structure, reduce infiltration, and increase sodicity, exactly as the lab's classification implies for the 500-foot sample, and as a real if smaller concern for the improved 580-foot sample.

Its central argument is that this assessment implicitly assumes a specific, and specifically vulnerable, production environment. PQNK changes that environment on every relevant axis: permanent raised beds protect soil structure and are never cultivated again after transition, organic mulch permanently covers the surface, water is applied only through permanent furrows rather than flooding the field, the root zone stays aerated and biologically active, rainfall infiltration improves, and surface evaporation drops substantially, meaning the same water behaves differently because it enters a living biological system rather than a repeatedly disturbed mineral soil.

For the 580-foot source specifically, the paper concludes that provided the complete PQNK transition protocol is followed, hardpan broken once, alkaline soil corrected before bed establishment, permanent beds and furrows built, no further cultivation, permanent mulch, living roots year-round, and irrigation only through furrows on an as-needed basis, never flooding, the water should perform satisfactorily despite its still-elevated bicarbonate and residual sodium carbonate levels, because soil biology, aeration, and organic matter increasingly buffer the water's chemical shortcomings over time.

The paper closes by stressing that PQNK does not claim to change the water's chemistry, only the soil's capacity to absorb and buffer marginal-quality water, and recommends periodic retesting of both the aquifer and key soil indicators (pH, EC, exchangeable sodium, infiltration rate, organic matter, biological activity) to confirm the transition is working as intended.

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Key Takeaways

  • Deepening a tube-well from 500 to 580 feet cut electrical conductivity by about 35%, sodium by roughly 49%, and SAR from 17.30 to 6.88, yet both samples were still lab-classified as unsuitable for irrigation.
  • The paper's core distinction: laboratory classification assumes conventional flood irrigation on repeatedly disturbed, bare soil, a context PQNK deliberately eliminates.
  • Under a complete PQNK transition (permanent beds, permanent mulch, furrow-only irrigation, no further cultivation), the improved 580-foot water is judged workable despite still-elevated bicarbonate and residual sodium carbonate.
  • The 500-foot source should be avoided whenever possible; the deeper aquifer is unambiguously the better choice regardless of farming system.
  • PQNK is explicit that it does not change irrigation water's chemistry, only the soil's biological and physical capacity to absorb and buffer it.
  • Recommends periodic retesting of both groundwater and soil indicators (pH, EC, exchangeable sodium, infiltration, organic matter, biological activity) through the transition period.