Root growth and nitrogen uptake of carrot, early cabbage, onion and lettuce following a range of green manures

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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.”
Modelling diverse root density dynamics and deep nitrogen uptake—A simple approach (2009, methodology): “Mineral N in the soil was measured on 18 May and 31 October 2001 and 16 May and 30 October 2002 (Thorup-Kristensen, 2006b).”
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).”
Effect of deep and shallow root systems on the dynamics of soil inorganic N during 3-year crop rotations (2006, background): “Catch crops may be used to create situations ideal for shallow-rooted crops, as they concentrate Ninorg in the uppermost soil layers (Thorup-Kristensen 2006).”