Abstract
ABSTRACTIn this paper, the uptake kinetics of various nitrogens (nitrate (NO3−), ammonium (NH4+), urea, amino acid) by Chinese kale (Brassica oleracea L. var. Bailey) were studied under hydroponic condition. The results indicated that the uptake kinetics of organic and inorganic nitrogen (N) by Chinese kale conform to the Michaelis–Menten equation, and the maximum uptake rate (Vmax) and affinity index (1/Km) showed nitrate (NO3—N) > ammonium (NH4+-N) > urea-N > Gly-N, with significant differences between treatments (p < 0.05). Adding different types of N to NO3− nutrient solution had little impact on its affinity, but significantly decreased the NO3− Vmax, which showed NO3–N > NO3− + NH4+ > NO3− + urea > NO3− + Gly. Chinese kale preferred inorganic N to organic N, with NO3− preceding NH4+. Adding organic and NH4+ N to nutrient solution reduced the NO3− uptake capacity by the plant.
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