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Objective of this study is to determine spatial variability in a dry onion fi eld and to produce a management strategy which is based on spatial variability of yield and soil components. The onion fi eld properties were determined and given in maps. Soil samples were taken to determine properties of soil such as pH, salt, humidity, CaCO3, organic matter, total N, Zn, Fe, P2O5, Ca+Mg, K, texture. Longitudinal slope was also measured. Results were used to produce maps. Most percentage of the fi eld soils was determined as clay-loam. Small part of the fi eld was loam. Yield of dry onion decreased by increasing of Organic Matter, Total Nitrogen, Iron, and Zinc in the fi eld according to the related maps. Relationship between yield and phosphorous, CaCO3, Ca+Mg and salt was positive according to the related maps.

It seems that urea fertilizers have advantages over ammonium nitrate fertilizers in terms of leaching losses when they are applied in February. On the other hand, the losses from the urea fertilizers in the form of NH3 gas when they are applied in February which is damp and cool, may be considered to be non signifi cant, which becomes a profound idea. Conducting fi eld trials on the investigation of suitable time and rate of urea fertilizers application may be suggested a way to be followed. According to the diagnosis from the research, hydrolyse of urea is bound to features of the soil. In the beginning of the incubation for the fact hydrolysis of urea is fast that features of soil. Dry wheat agriculture which takes major part in our agriculture, urea’s progress of hydrolysis ensure suitable and balanced fertilizing and also ensure the amount and quality of crop increase in a fi eld. It has to be emphasized with processing of an adequate and balanced program of fertilizing is useful both our economy and environment.