Background: Nowadays, salinity stress is the most important abiotic stress for plants, because in addition to reducing yield, it reduces the amount of fresh water and land that can be used for agriculture. By contrast, in soilless or hydroponic cultivation systems, plants are cultivated in an environment other than soil, in order to get to maximum plant density, improve yield and reduce soil contamination and nutrient uptake problems. Considering that tomato is a plant with high nutritional value and that it can be grown in different substrates, choosing a suitable substrate for cultivation that has the ability to reduce the effects of salinity is important.
Aim: This study in order the effect of activated carbon and potassium-enriched nano zeolite as an adsorbent under salty conditions on yield, growth, chemical composition and physiological properties of tomatoes, an experiment was conducted in the Faculty of Agriculture and Natural Resources of the Persian Gulf in coco peat and perlite.
Methodology: Experiment was performed as a factorial experiment in a completely randomized design with three replications. Factors include control treatment (without adsorbent), potassium-enriched nano zeolite at two levels (15 and 30 g / kg of culture medium), activated carbon at two levels (15 and 30 g / kg of culture medium) and salinity levels of water at three levels (1.8, 3.5 and 5.5 dS / m).
Conclusions: The results of analysis of variance related to morphological, physiological, phytochemical and elemental content of tomato shoot showed that the simple effect of adsorbent and salinity stress was significant for all traits at a probability level of one percent. Also, the results of the interaction of adsorbent and salinity stress were significant for all traits except the number of clusters, total soluble solids (TSS) and element content at a probability level of one percent. By comparing the means, it was found that with increasing salinity to 5.5 dS / m, yield and growth