INFLUENCE OF FERTILIZERS AND GROWTH REGULATORS ON YIELD AND NUTRIENTS CONTENT IN ONION (ALLIUM CEPA L) CULTURE IN WEST OF ROMANIA PUBLISHEDMONICA NEGREA, ERSILIA ALEXA, ISIDORA RADULOV, ILEANA COCAN, GH. CÎRCIU
Onion (Allium cepa L.) is an important food product in our daily diet and is a source of nutrients for human body. The purpose of this research was to determine the influence of different doses of fertilizers and growth regulators on macro and micronutrients accumulation and yield of onion culture, during three experimental years, 2011-2013. Field trials were conducted during 2011-2013, on a black Chernozem soil, the experiment was laid out in Randomized Complete Block Design with four replications. The nutrients analysis were carried out using AAS in the Laboratory of Soil Science and Plant Nutrition, Faculty of Agriculture, Banat’s University of Agricultural Sciences and Veterinary Medicine “King Michael I of Romania” from Timisoara. Most of studied nutrients in onion samples were significantly influenced by the sole application of NPK fertilizers rates and growth regulators (Aqzyme and Pervaide). Copper (Cu) content reveals a deficiency compared to the normal level, in all variants during the three experimental years. Results demonstrated that nutrients content varied considerably depending on the fertilization doses and climatic conditions. Among the three experimental years were significant differences in mineral content of onion culture, being registered higher values in 2011 both for macronutrients (P,K and Mg) and for micronutrients ( Fe, Cu, Zn and Mn).
onion, fertilizers, macronutrients, micronutrients, yields.