Geostatistical analysis of pH and redox potential (Eh) variability over a rice field in successive crop stages

Abstract:

The spatial variability of pH and redox potential (Eh) on an acid paddy soil in Corrientes, Argentina was analyzed. Soil was sampled in plots with three liming treatments, first before flooding, and then two times after flooding. Ninety-six samples per lime treatment and sampling date were taken on a 11.9 x 20 m grid. Following flooding pH increased, whereas Eh decreased. The statistical variability of pH was rather low during the three sampling periods and those of Eh was initially low but it sharply increased during the second sampling date. The pH spatial dependence was rather strong and those of Eh was strong to moderate during the three study periods and for the three lime treatments. Spherical models with low to moderate nugget effect were adjusted to experimental semivariograms of the 18 data sets studied. Kriging was useful in mapping soil pH and Eh allowing identifying microrregions with contrasting …

Año de publicación:

2009

Keywords:

Fuente:

google