Determination of the physiological response of lettuce to different irrigation water salinities (NaCl) and leaching fractions

Authors : Berkant Ödemiş, Derya Kazgöz Candemir, Cihan Karaca

Pages : 552-568

Doi:10.37908/mkutbd.1466659

View : 49 | Download : 75

Publication Date : 2024-08-12

Article Type : Research Paper

Abstract :The Amik Plain, where the experiment was conducted, is increasingly salinised owing to improper irrigation methods, excessive irrigation, drainage and groundwater use. This situation indicates that soil salinity will increase even more in the future. The study was conducted using a factorial experimental design in potted conditions inside the greenhouse to investigate the impacts of three distinct levels of irrigation water salinity (ECi) (ECi-0= 0.5 dS m-1 (control), ECi-2= 2 dS m-1and ECi-4= 4 dS m-1) and four different leaching fraction (LF) (LF0=0%, LF10=10%, LF20=20%, LF30=30%) on stomatal conductance (gs), leaf surface temperature (LSt), chlorophyll content (SPAD), chlorophyll concentrations (Chl-a, Chl-b, and Chl-tot) and yield parameters in \'Cospirina\' lettuce plants. As a result of the study, soil salinity (ECe) increased from 0.82 dS m-1 to 2.09 dS m-1 with increasing ECi. As ECi increased, plant water consumption (PWC) decreased from 8.92 to 5.71 L pot-1, yield decreased from 276 g pot-1 to 198 g pot-1, gs decreased from 266 mmol m-2 s-1 to 215 mmol m-2 s-1. LSt increased by 2.17% in ECi-2 and 6.4% in ECi-4 compared to the control. As ECe increased, yield decreased by 10% in ECi-2 and 28% in ECi-4 compared to the control treatment. Chl-tot and Chl-a were significantly affected by the increase in ECe (r2=0.96*, r2=0.99**, respectively), while Chl-b was not affected. In contrast to soil salinity, leaching fraction had a positive effect on plant physiology.
Keywords : Klorofil konsantrasyonu, Klorofil içeriği, Lactuca sativa L, Sera, Toprak tuzluluğu, Stoma iletkenliği, Yıkama oranı