عنوان مقاله [English]
This research was conducted to evaluate the effect of modifiers on water use efficiency, yield and some nutritional elements of carrot in a factorial based on randomized complete blocks with two factors including reformer type (Super absorbent polymer of water crystalline A, zeolite and perlite), and different levels (0, 0.5, 1, 1.5 and 2 g/kg soil), and four repetitions in greenhouse conditions. The results showed that interaction between modifiers and different levels has a significant effect on product performance and water use efficiency. Among the modifiers the superabsorbent polymer had the best effect at 2 g/kg on carrot plant performance and water use efficiency, with means 47.68 grams and 29.5 g/l, respectively. That in comparison with control treatment showed an increase 2.8 and 4.10 times, respectively. Also, Interaction between modifiers and different levels has a significant effect on the concentration of nutrients–such as nitrogen, phosphorus, potassium, sodium, magnesium and calcium–in the carrot plant. The highest nutrient concentrations of nitrogen, phosphorus, potassium, magnesium and calcium–2.34, 0.36, 1.77 and 1.55 percent, respectively –were superabsorbent correction at 2 g / kg soil.