تأثير إمداد البوتاسيوم والملوحة على تركيز البوتاسيوم في الانسجة النباتية
Keywords:
water quality, Salinity stress, Irrigation, Potassium nutritionAbstract
This study evaluated the effects of irrigation water salinity and potassium (K) supply on growth performance and cation accumulation in barley (Hordeum vulgare L.). A greenhouse pot experiment was carried out using a completely randomized design, comprising three irrigation treatments (freshwater, diluted seawater, and 150 mM NaCl), two potassium application levels (0 and 150 kg ha⁻¹), and two soil textures. Plant growth was assessed through measurements of dry matter yield and leaf area, while the concentrations of K⁺, Na⁺, Ca²⁺, and Mg²⁺ were determined in both shoots and roots. Salinity caused a significant reduction in leaf area, indicating that leaf expansion was more sensitive to salinity stress than to potassium availability. Conversely, dry matter production was only slightly influenced by salinity and showed no significant response to potassium fertilization. Potassium concentrations in plant tissues were predominantly controlled by salinity due to antagonistic Na⁺–K⁺ interactions. Salinity led to increased Na⁺ and Mg²⁺ accumulation and a concomitant decrease in Ca²⁺ concentrations. Potassium application did not alleviate the growth constraints induced by salinity
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