Saturday, 15 July 2006

Spatial Variability of the Soil Properties of Mapping Unit on Mountain Foot Slope in Granite Gneiss Area.

ki-yuol Jung, Eul-Soo Yun, and Il-Soo Son. Yeongnam Agricultural Research Institute, NICS, RDA, Korea, 1085, Nei-dong, Milyang -si, Gyeongsangnam-do, 627-803, Milyang, South Korea

In Korea, upland soils are distributed mainly in mountain (Mt.) foot slope and hilly areas where the slope is more than 7%m having harsh production environments. The soils on Mt. foot slopes have a quite low productivity, because of insufficient land consolidation and inappropriate soil management. In addition, the soil fertility of mapping units on Mt. foot slope showed a heterogeneity that was caused by high spatial variation of mass and soil water flow. To get some information for precision agriculture on sloping land management, this study was conducted in Goje myeon, Keochang count, Gyeongnam province, an area which is well developed mountain foot slope in granite gneiss at 2003. The experimental site was divided into a grid (10x10m unit) of equal distance square, in order to make the outline. The extraction of soil sampling site measured by GPS and the descriptive statistics was calculated within the grid. Finally, the spatial variation was analyzed using Kriging method and GIS spatial analysis tool to create the outline of this particular region. Variation of soil physico-chemical properties according to minuteness terrain indicated that the plow depth, the content of organic matter and av. P2O5 in soil were increasing from convex apical to nonapical as shown in fig. 1. The spatial variation of the inorganic content like pH, available P2O5, and Ca, was large. For the range in prices, it was in order of av. P2O5 > pH > Ca > Mg. However, the soil pH did not show any concrete difference for the unit grid. The fresh weight of chinese cabbage in nonapicalareas was greater than in convex apical. The difference of fresh weight of chinese cabbage fact may be derived from difference of the soil chemical property and soil moisture holding capacity due to soil depth.

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