Effect of Selenium Source and Concentrations on Growth and Quality of Endive and Pak-choi in Deep Flow Culture

摘要

To increase the selenium content in endive and pak-choi, sodium selenate, sodium selenite, and Se-amino chelate compound were treated at various concentrations in hydroponic nutrient solution for 7 days before harvesting The growth decreased with increasing the concentration of selenium in hydroponic solution. Especiaily, sodium selenite highly reduced the vegetative growth compared to the other source application and the 8 mg center dot kg~(-1) treatment decreased the fresh weight and leaf area by2.3- and 1.8-fold, respectively, than control. The ascorbic acid contents were higher by 1.2-fold, 71.4 mg center dot kg~(-1) FW in 8 mg center dot kg~(-1) sodium selenate treatment plot than control. Nitrate concentration including the other mineral nutrients was decreased. However, the selenium content linearly increased with increasing the selenium concentration in bydroponic solution