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Cover: Researchers at the University of Hohenheim (Germany) investigated the use of an optical sensor for determining N requirements of cereals. Variability in measured biomass and yield, sensor- based N application rate, measured soil characteristics, and rooting depth (numbers in circles) affected the N uptake and resulted in a heterogeneous N balance within the field. See “Assessment of Cereal Nitrogen Requirements Derived by Optical On-the-Go Sensors on Heterogeneous Soils,” by Zillmann et al., p. 682–690.

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