engleski

Faba bean (Vicia faba L.) salt stress response under different soil organic matter content

Salinization is one of the major environmental constraints that limit crop productivity and quality. Although being more expressed in southern regions of the world, this process is increasingly affecting European agricultural land as well, especially those in Mediterranean coastal areas due to use of saline irrigation water. Use of saline water for crop irrigation leads to rhizosphere salinization that affects plant element uptake, as well as trace elements accumulation in plant tissue. Imbalance in crop element uptake can reflect on crop productivity. Thus, assessment of crop salt stress response is useful for elucidating crop performance under salt stress. Soil organic matter (SOM) plays an important role in soil biogeochemical processes and especially affects trace element mobility and bioavailability. Thus, it is an important factor for assessment of plant responses under varying ecological conditions, including salinity. A greenhouse pot experiment was set up to study the effects of saline irrigation and increased SOM on faba bean (Vicia faba L.) salt stress response. Soil from arable land of Croatian coastal region was used for the trial. One half of the bulk of soil provided for the experiment was mixed with commercial peat (4:1) and two trial variants, unmodified and increased SOM content, were investigated. Two weeks after transplanting faba bean seedlings into pots, treatment with NaCl salinity was applied in nutrient solution as follows: NaCl0 – control (basic nutrient solution without added NaCl), NaCl50 (control + 50 mM NaCl) and NaCl100 (control + 100 mM NaCl). Increased SOM affected P (pod, seed), Mg (leaf), Zn (seed), Mo (leaf, pod, seed) and Cu (pod) content of faba bean plants. Raised rhizosphere salinity affected faba bean dry matter content (leaf, pod), Na and Ca (leaf, pod, seed), Mg (leaf, pod), K (leaf), S (seed), as well as Mo (pod, seed) and Cu (pod) content. Saline irrigation and increased SOM affected element accumulation in bean plant, although no significant interaction between rhizosphere salinization and SOM was revealed.

faba bean; nutrient uptake; rhizosphere salinity; trace element

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