Abstract
Chemical soil analysis data can be expressed by weight (i.e., gravimetric basis) or volume (i.e., volumetric basis) of the fine earth (sieved ≥2 mm), resulting in different units, cmolc kg-1 and cmolc dm-3, respectively. The research problem is that the difference between methods to express the same soil properties hinders the comparison of results and database or dataset standardization. This paper aims to develop pedotransfer functions (PTF) to obtain the density of fine earth, which will then be used [...]
Highlights
The majority of soil chemical and physical analyses start with the preparation of samples in the laboratory, through drying and maceration, followed by sieving (≥2 mm) to obtain the called fine earth (Teixeira et al, 2017)
This paper aims to develop pedotransfer functions (PTF) to obtain the density of fine earth, which will be used for conversion data expressed in volumetric to gravimetric basis, or vice versa, that will be applied to compare results and to standardize databases with different units
The dataset used for the development of Pedotransfer Function 2 (PTF2) has some low clay contents, which can lead to high-density predictions, so it is recommended to use it with caution
Summary
The majority of soil chemical and physical analyses start with the preparation of samples in the laboratory, through drying and maceration, followed by sieving (≥2 mm) to obtain the called fine earth (Teixeira et al, 2017). The most common procedure to evaluate soil fertility in Brazil and countries such as the U.S.A., is to sample volumetrically the fine earth by using a device that consists of a small cylinder with a 10 cm volume (Silva et al, 2009; Soil Survey Staff, 2014a). This device gives convenience and speed in the process of sample preparation for chemical analysis. Details about the chemical properties for soil classification and chemical analyses units are presented in the publications IUSS Working Group (2015), Santos et al (2018), Soil Survey Staff (2014b), Kellogg Soil Survey Laboratory Methods Manual (Soil Survey Staff, 2014a), and the Manual for soil and water analysis (Buurman et al, 1996)
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