Ankara koşullarında toprak profili derinliğinin nadas etkinliği üzerine etkisi
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The aim of this study was to compare the fallow efficiencies of shallow and deep soil profiles and to examine the effects of nitrogen fertilization on the grain yields in continuous wheat and fallow-wheat systems in the Ankara Region. The experimental study was conducted at the Beytepe (Lodumlu) Research Institute in two different fields. Soil moisture contents were determined at six depths between 0-90 cm in the field 1, and four depths between 0-40 cm in the field II. Continuous wheat and fallow-wheat plots were fertilized with (NH4)2S04 with 2 kg/da and 4 kg/da N doses. The results indicated that the efficiency of the fallowing would increase with related more water storage in the soil profile in the deeper profile. Fallow efficiency was found 18.43 % in the field I, whereas no significant differences occurred between fallowed and continuously cropped plots in the field II. This distribution was more effective on the grain yield than the annually total rains.