Spatial variability of soil physical properties in a cultivated field

Authors : Coşkun Gülser, Imanverdi Ekberli, Feride Candemir

Pages : 192-200

Doi:10.18393/ejss.2016.3.192-200

View : 12 | Download : 7

Publication Date : 2016-06-20

Article Type : Research Paper

Abstract :Spatial variability of soil physical properties in a cultivated field such as; bulk density insert ignore into journalissuearticles values(BD);, penetration resistance insert ignore into journalissuearticles values(PNT);, saturated hydraulic conductivity insert ignore into journalissuearticles values(Ks);, field capacity insert ignore into journalissuearticles values(FC); and permanent wilting point insert ignore into journalissuearticles values(PWP);, were determined by geostatistical method. While BD values varied between 1.12 and 1.41 gcm -3 , PNT resistance insert ignore into journalissuearticles values(0.66 to 1.88 MPa);, clay content insert ignore into journalissuearticles values(31.48 to 43.97%);, Ks insert ignore into journalissuearticles values(1.46 to 3.37 mm h -1 );, FC insert ignore into journalissuearticles values(30.40 to 39.66%); and PWP insert ignore into journalissuearticles values(19.22 to 24.42%); values showed variations with soil cultivation. In kriging interpolation for the spatial variability of soil properties, the biggest r 2 and cross validation r 2 values were determined with spherical model for PNT, Ks, FC values, and exponential model for clay, BD and PWP. Spatial dependences of the properties, except BD, were found to be strong in the field. Ks values significantly increased with increasing BD insert ignore into journalissuearticles values(0.340*);, and decreasing clay content insert ignore into journalissuearticles values(-0.905**); and PNT insert ignore into journalissuearticles values(-0.288*); values in the field. Spatial variations of soil physical properties in the field are generally controlled by the particle size distribution as a fundamental factor. Heterogeneity and variation of soil physical parameters in a field due to soil plowing should be taken into consideration for a successful agricultural management.
Keywords : Tillage, spatial variability, soil physical properties, kriging