Abstract
The organic matter (OM) contained in soils is one of the properties of major interest due to his paper in the structure and to his recognized influence in the dynamics of solutos. Characterization is therefore an aspect of great interest. The OM in soils cropped malting barley (Hordeum distichumL.) are relatively low, so that the uncertainty and possible errors of the analytical method may determine spatial variability studies. In this paper we developed and validated a method for analysis of OM according to the criteria of ISO-17025 and designed a quality control, including a study of the variability that the methodology introduced in the results. With the developed methodology has conducted preliminary sampling and sampling end of 39 and 248 representative samples from a plot planted to malting barley Apan Township, south of the state of Hidalgo, Mexico, whose aim was to evaluate the number of samples needed to be taken to characterize this soil and this property (OM). The work was completed with a geostatistical study of the values of OM, which conclusions can be drawn for future sampling plans, development of simulation models and field-scale practical application of fertilization problems.
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