Growth and physiological reactions of common bean cv. Sanry in response to salicylic acid and biostimulants under different irrigation regimes

In order to study the effect of foliar application of salicylic acid (SA) and biostimulants on growth, physiological characters, nitrogen, phosphorus and potassium concentration and pod yield of common bean cv. Sanry under different irrigation regimes, the experiment was conducted split plot in a randomized complete block design with three replicates in research filed of university of Zanjan during 2015. Three different irrigation (I) regimes (100, 75 and 50% ETc) and foliar application of salicylic acid (0.5, 1 and 1.5 mM), Megafol (0.1, 0.2 and 0.3% MF) and to distilled water as control were conducted. The results showed that water deficit stress significantly reduced growth and pod yield. Foliar application of SA and MF enhanced growth and fruit yield. The irrigation × foliar treatments interactions results suggested that maximum leaf number (43.1), leaf area (2729.3 cm-2) and pod yield (6193.9 kg.ha-1) was obtained using MF 0.2% under I100 %ETc. Plants sprayed with SA 1.5mM and MF 0.2% exhibited higher stomatal conductance (205.27 mM.m-2s-1) under I100 %ETc. The highest N (2.47%), P (181.6 ppm) and K (0.88%) concentration was found in plants sprayed with MF 0.2%, SA 1mM and MF 0.3%, respectively under I100 %ETc. According to the results, MF 0.2% and SA 0.5 mM had the highest effects on growth and pod yield under water deficit stress.