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Selçuk Üniversitesi (2021)

The effect of different levels of irrigation water salinity on the morph-physiological and biochemical properties of spinach under limited irrigation conditions

KILIÇ Ersin

Titre : The effect of different levels of irrigation water salinity on the morph-physiological and biochemical properties of spinach under limited irrigation conditions

Kısıtlı sulama koşullarında, farklı seviyelerdeki sulama suyu tuzluluğunun ıspanağın morfo-fizyolojik ve biyokimyasal özelliklerine etkisi

Auteur : KILIÇ Ersin

Université de soutenance : Selçuk Üniversitesi

Grade : Master in Farm Structures and Irrigation 2021

Résumé
The quantity and quality of the water used in agriculture are important factors in ensuring a sustainable agricultural production in arid and semi-arid areas. It is very important to determine the responses of plants to different irrigation water salinity under deficit irrigation conditions in such areas. Therefore, in this study, the responses of spinach to different irrigation water salinity and different water stress were investigated in terms of agronomic and physiological aspects. In the research, a total of 15 experimental treatments including five different irrigation water salinity (T1, control ; T2, 1.5 dS/m ; T3, 3.0 dS/m ; T4, 4.5 dS/m and T5, 6.0 dS/m) and three different irrigation levels (S1, full irrigation ; S2, %25 water deficit and S3, %50 water deficit) were carried out according to the factorial design in randomized plots, with three replications. Irrigation water salinity in spinach ; it had statistically significant effects on the results regarding the fresh and dry weights above-ground the soil, leaf area, membrane damage, chlorophyll-a, chlorophyll-b, total chlorophyll and carotenoid values. Similarly, enzyme activities such as peroxidase (POD), catalase (CAT) and superoxide dismutase (SOD) and malondialdehyde (MDA), protein, proline and hydrogen peroxide (H2O2) contents were statistically affected by irrigation water salinity. While irrigation water salinity caused statistically significant decreases in leaf mineral contents such as nitrogen (-%12.5), boron (-%20.6), copper (-%30.7), potassium (-%21.8), magnesium (-%17.0), phosphorus (-%9.9) and sulfur (-%22.2), it also caused statistically significant increases in iron (+%447.5) and sodium (+%457.5) content. Irrigation different level application in spinach ; there were significant statistical differences in the number of leaves per plant, above-ground fresh and dry weights, underground fresh and dry weights, leaf area, leaf l water content, chlorophyll-a, chlorophyll-b and total chlorophyll results. On the other hand, enzyme activities such as CAT and SOD, and MDA, protein and proline content were statistically affected by different irrigation levels. In different irrigation water salinity applications, the highest yield response factor (ky) was calculated with 1.79 in the control (T1) application, followed by the T2 (1.5 dS/m) application with 1.32. On the other hand, the ky values of spinach were found to be less than 1.00 in irrigation with irrigation water with an EC of 3.0 dS/m and above, that is, it was determined to be tolerant to water constraint. Especially in irrigations with saline irrigation water such as 4.5 and 6.0 dS/m, the yields obtained at the S2 (%25 water stress) irrigation level were found to be close to the yields of the subjects with full irrigation, even slightly higher. Therefore, in arid and semi-arid regions with limited water resources and saline irrigation water, 25% water restriction on spinach has been proposed as an important strategy for both the protection of water resources and the control of soil salinity.

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Page publiée le 31 décembre 2022