Seasonal Climatic Variability and Upward Nitrate Movement in Greek Soils
Nitrate concentrations in the groundwater and rivers of Greece have gradually increased, although this exhibits seasonal variation. It is necessary to take action to avoid further increases in the future. The main purpose of this study was to measure nitrogen leaching, under a wheat crop in the Kopais area of Greece (Theocharopoulos et al., 1993), under very changeable climatic conditions during the cropping period and for different nitrogen fertilisation treatments. We did this by investigating the pattern of nitrogen distribution in the soil profile of two soil map units during the cropping period and quantifying losses from one of the main crops of the area, winter wheat. We tried to detect the dominant factors throughout the year causing leaching for each soil type in relation to seasonal climatic variability and nitrogen applied, since wheat is sown in October-November and is harvested in June-July.
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