Using Indicator Kriging for Evaluating Spatial Soil Quality Chemical Indicators. (4907)
Authors:
J. Cora* - Sao Paulo State University-Jaboticabal
Abstract:
Awareness of the importance of soil quality for agricultural sustainability has
increased in the last years. Because assessing soil quality is complex, the individual soil quality indicator needs to be integrated to form a soil quality index. The
objective of this work was to identify site-specific management zones throughout chemical soil quality indicators on oxisols, using indicator kriging procedure. The study was conducted in a field located at Jaboticabal, São Paulo State – Brazil (21o15' S e 48o 18' W). A 50 m regular grid was imposed on the experimental area (300 by 3000 m). Soil samples were obtained at each 50 m grid point from the top 0.2 m. Organic matter, P, K and V% values were determined for the soil samples.
The soil attributes data were coded as 0 or 1 if they lie above or below the threshold value chosen for each variable, respectively. Using the results of geostatistical analysis for the coded data set and the indicator kriging procedure, counter maps of probability of meeting the critical threshold value for each of the individual soil attribute and combinations of them were produced. These maps indicated areas in the landscape that have different probability of having good soil quality. The procedure used allowed the identification of the indicator parameters responsible for zones of relativity low soil quality, thus allowing specific management plans.
Speaker Information: Jose Cora, Sao Paulo State University-Jaboticabal, Via de acesso Prof. Paulo Donato Castellane, Jaboticabal, SP 14884-900; Phone: 55 16 3209-2672; E-mail: [email protected]
Session Information: Monday, November 1, 2004, 1:30 PM-3:30 PM Presentation Start: 1:30 PM (Poster Board Number: 2654)
Keywords: indicator kriging; chemical indicator; geostatistics; soil quality
