Integrative Assessment of Nitrogen and Irrigation Regimes on Chickpea Productivity Using Treatment-by-Trait Biplot Modeling

M. Nouraein; F. Shekari; A. Abbasi; N. Sabaghnia; M. Janmohammadi

doi:10.56093/aaz.v64i3.166995

Authors

M. Nouraein Department of Plant Production and Genetics, Faculty of Agriculture, University of Maragheh, Maragheh, 55181-83111, Iran
F. Shekari Department of Plant Production and Genetics, Faculty of Agriculture, University of Maragheh, Maragheh, 55181-83111, Iran
A. Abbasi Department of Plant Production and Genetics, Faculty of Agriculture, University of Maragheh, Maragheh, 55181-83111, Iran
N. Sabaghnia Department of Plant Production and Genetics, Faculty of Agriculture, University of Maragheh, Maragheh, 55181-83111, Iran
M. Janmohammadi Department of Plant Production and Genetics, Faculty of Agriculture, University of Maragheh, Maragheh, 55181-83111, Iran

https://doi.org/10.56093/aaz.v64i3.166995

Keywords:

rainfed condition, , seed yield, supplementary irrigation, normal irrigation

Abstract

This research aimed to study the interactive impacts of nitrogen fertilization and irrigation regimes on the performance of chickpea (Cicer arietinum L.). A split-plot layout based on a randomized block scheme with five replications was done during the 2024–2025 growing season. The main plots consisted of four irrigation treatments: well-watered (I1), rainfed (I2), and supplementary irrigation applied at flowering (I3) or at both flowering and seed formation stages (I4). The sub-plots included three levels (N1, N2, and N3) of nitrogen starter fertilizer (0, 20, and 40 kg ha-1). The first and second components of treatment-by-trait interaction model accounted for 87% of variation, allowing for reliable graphical interpretation. Biplot analysis revealed that well-watered combined with nitrogen application at 20 or 40 kg ha-1 (I1-N2 and I1-N3) significantly enhanced seed yield and yield components. However, supplementary irrigation during key reproductive stages (I3-N2, I4-N2, and I4-N3) also produced favorable results, offering a water-efficient alternative to full irrigation. Traits such as yield performance, pods and seeds of plant, plant height, and chlorophyll content were identified as highly representative and responsive, while root depth, harvest index, and water use efficiency showed greater variability across treatments. The findings confirm that nitrogen fertilization is essential not only for improving early growth and establishment in semi-arid soils, but also for maximizing yield when synchronized with strategic irrigation. These results support the development of integrated nutrient and irrigation management strategies tailored to semi-arid agroecosystems to improve legume yield, resilience, and resource use efficiency.

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