Scientia Agricultura Sinica ›› 2013, Vol. 46 ›› Issue (17): 3736-3742.doi: 10.3864/j.issn.0578-1752.2013.17.024

• RESEARCH NOTES • Previous Articles    

Effects of Hydroponics on Nutrient Components and Nitrate Contents in Tips of Leaf Vegetable Sweet Potato

 CHEN  Xuan-Yang, ZHANG  Zhao-Juan, ZHENG  Jia-Wei, LIN  Yu-Li   

  1. Key Laboratory for Genetics, Breeding and Multiple Utilization of Crops of Ministry of Education/Fujian Agriculture and Forestry University, Fuzhou 350002
  • Received:2012-12-13 Online:2013-09-01 Published:2013-03-12

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Abstract: 【Objective】The effects of hydroponics with different nutrient solutions, nutrient solutions with different N forms and their ratio on nutritional quality and nitrate content in tender stem, leaf and petiole of the tips of leaf vegetable sweet potato were studied. 【Method】 Half-Hoagland(1/2HL) nutrient solution was used for hydro culturing leaf-vegetable sweet potato, the leaves, stems and petioles were sampled for determining the contents of nutrient components and nitrate after culturing for 3, 5 and 7 weeks. Four classical selected nutrient solutions and 10 other nutrient solutions modified with different N forms and ratios were used, nitrate content of leaf, stem and petiole of samples were determined after hydro cultured for 5 weeks. 【Result】The contents of VC, flavone and nitrate in leaf-vegetable sweet potato hydro cultured in the 1/2HL nutrient solution were significantly higher than that of cultured in the field, while there were no difference in protein contents between them. There were significant differences in nitrate content among different parts of leaf vegetable sweet potato plant, the content in the tender stem was the highest, the leaf was the medium, and the petiole was the lowest. There were significant effects of different nutrient solutions on the nitrate content in the leaf-vegetable sweet potato. The nitrate content in leaf-vegetable sweet potato cultured in Hua’nan B and 1/2HL solution were significantly higher than that in Hua’nan A. While the nitrate content in Yuansi solution was similar with that cultured in the field, and both of them were significantly lower than those in 1/2HL, Hua’nan A and Hua’nan B. There were significant effects of different N forms and their ratios in the nutrient solutions on the nitrate content in leaf-vegetable sweet potato. With the increasing of concentration and proportion of NO3--N in the solution, the nitrate content in leaf vegetable sweet potato increased. The appropriate content of NH4+-N in the solution retarded the increase of nitrate content in the leaf-vegetable sweet potato. (CO(NH2)2-N in the nutrient decreased the nitrate content of hydroponic leaf-vegetable sweet potato. 【Conclusion】Hydro culturing increased VC, flavone and nitrate contents in leaf-vegetable sweet potato, while had no influence on the protein content. More NO3--N in the nutrient solution increased the nitrate content of the leaf-vegetable sweet potato, while appropriate content of NH4+-N retarded its increase. (CO(NH2)2-N in the solution could decrease the nitrate content.

Key words: leaf vegetable sweetpotato , hydroponic , quality , nitrate content

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