Effect of Nano Iron and Solupotasse Fertilizers on Accumulation of Nutrient Elements and Quality of Two Onion (Allium cepa) Cultivars

To study the effect of nano iron and solupotass on agronomic and physiological traits of two onion cultivars, a factorial experiment was conducted in complete randomized block design with 32 treatments and three replications in Joghatai of Khorasan-e- Razavi province, Iran. Treatments consisted of two onion cultivars (red, yellow) and four levels (0, 1, 2, 3 kg per hectare) of nano iron chelat and four levels of solupotass (0, 5, 10, 15 kg per hectare). Results showed that the effect of nano iron and solupotasse on fresh weight, dry weight, pyrovic acid and macro element (N, P, S) contents were significant at %1 levels. Application nano iron, solupotasse to red onion cultivar increased dry weight significantly at the %5 level. Highest onion weight was obtained by using 2 kg nano iron and 15 kg solupotasse (17.3 g). Use of nano iron and solupotasse highly increased the pyruvic acid percentage (1.07 mM). Highest rate of pyruvic acid obtained by application of 3 and 15 kg nano iron and solupotasse respectively. Application of nano iron on the sulfur and nitrogen contents of onion were significant. Use of 2 kg/ha of nano iron exhibited highest increase in these elements. Thus, soil application of 10 kg/ha solupotasse, 3 kg/ha nano iron would highly increase red onion traits mentioned above.