Spatial and temporal variability of soil physical properties of norfolk loamy sand as affected by tillage

摘要: Abstract Physical properties of field soil vary both spatially and temporally. Because so little information is available concerning the changes in magnitude physical as functions depth, distance normal to a crop row, time, they have largely been ignored model development. The purpose this study was evaluate quantitatively spatial temporal variability imposed by several tillage operations on properties. Three treatments, replicated 4 times randomized complete block design, were (1) conventionally-disked 3 before planting, (2) full width strip chisel plowed 27-cm (3) in-row-subsoiled plus bedding. Soil measured cone index (CI), weight percentage water (Pw), bulk density (Db), characteristic curve, saturated hydraulic conductivity (Ksat) settling. These times: immediately after planting soybeans (Glycine max (L.) Merr.) 16 May; June; 8 July 1977. at 0–14, 14–28, 28–41-cm depths positions relative row i.e., trafficked interrow, non-trafficked interrow. Significant differences due treatment found for Db, CI, characteristic. greatest variation occurred 0–14-cm depth decreased with depth. most variables also position interactions. All exhibited significant variation.