Effect of Management on Spatial and Temporal Distribution of Soil Physical Properties

Authors : Engin ÖZGÖZ, Hikmet GÜNAL, Hüseyin ÖNEN, Mustafa BAYRAM, Nurullah ACİR

Pages : 77-91

Doi:10.1501/Tarimbil_0000001194

View : 20 | Download : 8

Publication Date : 2012-03-04

Article Type : Research Paper

Abstract :The purpose of this study was to characterize spatial and temporal variations in soil physical properties and to examine possible differences that might occur when the crop rotation shifted to rice cultivation. Soil samples from 0-20 cm and 20-40 cm depth were collected on a 100×100 m grid basis over a 45 ha field, in May 2005 and May 2011. The geostatistical methods were used to model the variance structure of gravimetric water content insert ignore into journalissuearticles values(GWC);, soil bulk density insert ignore into journalissuearticles values(BD);, penetration resistance insert ignore into journalissuearticles values(PR); and aggregate stability insert ignore into journalissuearticles values(AgS);. The coefficient of variations were 17.5% for GWC, 7.1% for BD, and 25.0% for PR at surface and 12.8% for GWC, 6.7% for BD, and 17.1% for PR at subsurface. PR at subsurface insert ignore into journalissuearticles values(>2MPa); and BD at surface and subsurface soils insert ignore into journalissuearticles values(1.47 g cm-3); exceeded the threshold values in some fields of the study area. Temporal variations of GWC and PR at 0-20 cm and 20-40 cm depths were significant insert ignore into journalissuearticles values(P<0.01); while BD was significantly varied only at 20-40 cm. Spatial correlation ranges of GWC, BD and PR varied from 72 m to 433 m in 2005 and 40 to 1524 m in 2011. The spatial dependences of GWC, BD and PR at surface were moderate, and AgS had strong dependency at this depth. The spatial distribution maps of soil physical attributes are useful in identifying the limiting factors and take necessary precaution to prevent further loss of soil quality.
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