Residual Effects of Organic Manure on Onion Varieties’ Mineral Content

This study was conducted to determine the residual effects of chicken manure applications onnutrients in leaves and bulbs of second crop onion that grown after lettuce in greenhouse conditions.In the study, residual effects of chicken manure in 4 different doses (control, 20 t ha-1, 40 t ha-1, 60t ha-1) and chemical fertilizers applied in the recommended amounts are investigated. Three onionvarieties, called Burgaz, Snow white, Champion, were used. In the study, the lowest nutrient uptakewas observed in control. However, the highest mineral content in leaves and bulbs were determinedin the plots, that on average 40 t ha-1 chicken manure was applied to. In terms of leaf nutrientcontent, when the varieties were compared to each other, Ca, Mg, and Cu contents were found tobe the highest in the Burgaz variety. Phosphorus, Zn, Mn contents were analyzed to be the highestin Snow white while N values determined maximum in Champion. The Champion variety containedhigher nutrient values in bulbs.