Raphael A. Viscarra Rossel

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Visible-near infrared diffuse reflectance (vis-NIR) spectroscopy is a fast, nondestructive technique well suited for analyses of some of the essential constituents of the soil. These constituents, mainly clay minerals, organic matter and soil water strongly affect conditions for plant growth and influence plant nutrition. Here we describe the process by(More)
This paper describes the development of an empirical deterministic two-factor response surface model for the Woodruff lime-requirement buffer (WRF). The model may be used to produce variable-rate lime requirement maps, or to predict lime requirements in real-time. Hence it may be suitable as a component of a decision support system (DSS) for the(More)
Phosphorus is added to agriculture soils by applying chemical fertilizers and manure; if not completely consumed by crops and plants, it can mobilize in reduced conditions and end up in ground water and, ultimately, in surface water bodies due to leaching and/or runoff. Soil reflectance spectroscopy (SRS) shows promise in providing for the rapid assessment(More)
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