Diagnostic Systems for Plant Nutrient Analysis (DRIS, MDRIS, PASS) R package drisdiagnostics version 1.0.1 Provides implementations of the Diagnosis and Recommendation Integrated System (DRIS), the Modified DRIS (MDRIS), and the Plant Analysis with Standardized Scores (PASS) approaches for nutrient diagnosis in crops. These methods allow quantitative evaluation of nutrient imbalances using ratio-based indices and standardized scores, supporting improved fertilizer use efficiency and crop management decisions. The DRIS method is described in Walworth, J.L. and Sumner, M.E. (1987) <doi:10.1007/978-1-4612-4682-4_4>. The MDRIS approach is detailed in Beverly, R.B. (1987) <doi:10.1080/01904168709363672>. The PASS method combining DRIS and sufficiency ranges is presented in Baldock, J.O. and Schulte, E.E. (1996) <doi:10.2134/agronj1996.00021962008800030015x>. Software Depends: R (>= 3.5) Imports: ggplot2, stats, rlang Suggests: readxl, testthat (>= 3.0.0) Blesson B. Varghese <blessonvarghese1234@gmail.com> Comprehensive R Archive Network (CRAN) Blesson B. Varghese [aut, cre], Mubashir Sadiq V [aut], Deepthi C [aut], Sowmiya Saravanan [aut], Aparna Mohan V [aut] GPL-3 2026-09-26 application/tgz https://CRAN.R-project.org/package=drisdiagnostics doi:10.32614/CRAN.package.drisdiagnostics