Spatial variability of total soil nitrogen and sulphur content at two conventionally managed fields
Vanek, V.,Ceska Zemedelska Univ., Prague (Czech Republic). Fakulta Agrobiologie, Potravinovych a Prirodnich Zdroju | Balik, J.,Ceska Zemedelska Univ., Prague (Czech Republic). Fakulta Agrobiologie, Potravinovych a Prirodnich Zdroju | Silha, J.,Ceska Zemedelska Univ., Prague (Czech Republic). Fakulta Agrobiologie, Potravinovych a Prirodnich Zdroju | Cerny, J.,Ceska Zemedelska Univ., Prague (Czech Republic). Fakulta Agrobiologie, Potravinovych a Prirodnich Zdroju
The main objective of this work was to evaluate correlations of spatial variability of total soil N and S contents with crop yield, slope of the plots and soil moisture. Two plots were investigated (I: 54 ha and II: 32 ha). Soil samples were taken from the topsoil in a regular grid which was localised by GPS (individual sampling points were 80 m apart). The average N concentration in plot I was 0.16%; in plot II it was 0.12%. S conc. in plots I and II were 0.09% and 0.08%, respectively. Spatial variability of total N differed in separate parts of the plots. A higher variability was recorded in plot I with the coefficient of variation (CV) 15.7%, whereas in plot II the CV was only 11.1%. However, S conc. showed only little variability, and thus its CV were low (2.5 and 2.3% in plots I and II, respectively). A positive relationship was observed between N conc. and crop yield. This effect was more significant in plot II. The S conc. showed no correlation with yield. Furthermore, positive correlations were observed between field altitude, soil moisture and crop yield in both plots.
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