Abstract
The main purpose of the two consecutive experimental studies presented here was to compare the effect of salinity on nutrients in leaves of the halophytic plant species Portulaca oleracea L. and in soil. The first experiment was conducted to study the effect of salinity on plant growth, biomass accumulation, yield, root layer development, salt accumulation, and the dynamics of changes in mineral substances in plants and soil. In the second experiment, P. oleracea seeds were sown directly into salinized soil (treated immediately before plant growth) to determine the nutrient levels in leaves and soil. Three salinity treatments (saline water solution with NaCl: T1, 5 dS m−1; T2, 9.8 dS m−1; and T3, 20 dS m−1) and a control treatment (T0, 1 dS m−1) were used in the first experiment. The soil in the second experiment was used in a previous study (performed immediately before P. oleracea growth) (salinized soil: T1, 7.2 dS m−1; T2, 8.8 dS m−1; T3, 15.6 dS m−1; T0, 1.9 dS m−1). The plants were irrigated with tap water at amounts in the range of 0.25–0.50 L/pot. Analysis of the experimental results showed that P. oleracea is resistant to salinity, is able to remove ions (400–500 kg ha−1 NaCl), and can be grown in saline soil. The results indicated that P. oleracea is able to grow in high-salinity soil. This finding was confirmed by the dry matter obtained under high-salinity conditions. Salinity stress affected nutrient uptake in leaves and soil.
Highlights
Purslane has long been known to be a highly nutritious leafy vegetable with respect to high levels of omega-3 fatty acids
The results indicated that the levels of the macronutrients phosphorus (P), calcium (Ca2+), magnesium (Mg2+), and sulphur (S) in the leaves decreased in all the saline soil treatments compared to the control group
P. oleracea was relatively tolerant to saline conditions
Summary
Purslane has long been known to be a highly nutritious leafy vegetable with respect to high levels of omega-3 fatty acids. Purslane (Portulaca oleracea L.) is the eighth most common plant distributed throughout the world, because it is an important heat- and drought-tolerant vegetable crop [2]. Purslane (Portulaca oleracea) is a drought- and salt-tolerant annual plant that contains high amounts of beneficial antioxidant vitamins and minerals. The effect of salt stress on the growth and mineral composition of purslane (Portulaca oleracea L.) was studied [3]. The ‘weed’ purslane (Portulaca oleracea L.) is gaining special attention by agriculturists and nutritionists. It is a common weed in turfgrass areas as well as field crop areas [4,5]
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