Uptake Kinetics of Different Nitrogen Forms by Chinese Kale

作者：Song, Shiwei; Li, Gang; Sun, Guangwen; Liu, Houcheng; Chen, Riyuan^*

来源：Communications in Soil Science and Plant Analysis, 2016, 47(11): 1372-1378.

DOI：10.1080/00103624.2016.1178279

• Brassica oleracea L. var. alboglatra (LH Bailey)
• nitrogen form
• uptake kinetics

In 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.

• 出版日期2016
• 单位华南农业大学; 华南热带农业大学