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MAPPING OF SOIL CONDITIONS IN PRECISION AGRICULTURE

MAPPING OF SOIL CONDITIONS IN PRECISION AGRICULTURE,Vojtech Lukas,Lubomir Neudert,Jan Kren

MAPPING OF SOIL CONDITIONS IN PRECISION AGRICULTURE   (Citations: 5)
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A b s t r a c t . The present paper verifies the efficiency of the me thod for electrical conductivity (EC) measurement for the assessment of spatial variabili ty of soil properties in precision agriculture. The verification was carried out in a 53-ha experimenta l field situated in South Moravia, Czech Republic. EC was measured using the EM-38 (Geonics Ltd, Canada) in 2004 and 2005. At the same time, topsoil samples were taken for agrochemical analyses of P, K, Mg, Ca, humus content and pH value, and for soil texture anal ysis. A strong correlation between years of EC measurements (r 2 = 0.936) was found, which confirms the stability of EC measurement from a short-time point of view. Strong relationships between EC and clay content (r 2 = 0.548) as well as sand content (r 2 = 0.406) confirm the influence of soil texture on EC. Furthermore, almost all examined agrochemical characteristics (P , K, Mg content and pH value) and humus content show relatively balanced, moderately strong correlations with EC. It indicates that the soil EC measurement is a suitable tool for mapping field spatial variability of soil conditions. This information can be used m ainly for directed sampling when locations of soil sampling points are determined by preliminary knowledge of field heterogeneity - EC maps. In contrast to traditional grid sampling, reduction in soil samples and at th e same time keeping the level of soil maps details can be expected. K e y w o r d s : soil electrical conductivity, spatial variability, precision agriculture
Published in 2009.
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