Table 1.
Concentrations of inorganic, amino acid and peptide N in the soil solution of a UK agricultural soila.
Figure 1.
Uptake of peptide or amino acid N by sterile roots of wheat.
Uptake determined over 5 h from the depletion of 14C from 10 µM solutions of single N forms. Values are mean ± SEM; n = 3.
Figure 2.
Uptake of N by sterile roots of wheat from a mixed N form solution.
Uptake determined by solution 14C depletion (organic N) or 15N recovery in plants (inorganic N). L-alanine •, D-alanine ○, L-trialanine ▾, NO3- □, NH4+ ▪. Values are mean ± SEM; n = 3.