Effect of deep and shallow root systems on the dynamics of soil inorganic N during 3-year crop rotations

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Resilient Adaptation to Climate Change in African Agriculture (2010, background): “As these different plants explore different and complementary regions of the soil profile they increase the water use efficiency and nutrient cycling (FAO 2005c; Thorup-Kristensen 2006).”
Incorporation time of nitrogen catch crops influences the N effect for the succeeding crop (2010, methodology): “…Neff depends strongly on the soil depth chosen for the calculation as found by Thorup-Kristensen & Nielsen (1998), and when Neff is estimated by soil analysis, it is therefore essential that the sampling depth is similar to the rooting depth of the succeeding crop (Thorup-Kristensen, 2006b).”
Modelling diverse root density dynamics and deep nitrogen uptake—A simple approach (2009, methodology): “for oilseed rape (Barraclough 1989) and fodder radish (Smit and Groenwold 2005; Thorup-Kristensen 2006b ).”
Diverse concepts of breeding for nitrogen use efficiency. A review (2017, background): “Therefore, Thorup-Kristensen (2006a) suggested that for cabbage, most benefits can be expected from improving utilization efficiency.”