Urea transformation and the adaptability of three leafy vegetables to urea as a source of nitrogen in hydroponic culture

References

• Barber , S.T. 1984 . “ Nutrient balance and nitrogen use ” . In Nitrogen in Crop Production , Edited by: Hauck , R.D. 87 – 95 . Madison, Wisconsin : ASA, CSSA, SSSA .
   Google Scholar
• Craddock , V.M. 1983 . Nitrosamines and human cancer: proof of an association? . Nature (London) , 306 : 638
   PubMed Web of Science ®Google Scholar
• Douglas , L.A. and Bremner , J.M. 1970 . Extraction and colorimetric determination of urea in soils . Soil Sci. Sci. Amer. Proc. , 34 : 859 – 862 .
   Google Scholar
• Epstein , E. 1972 . Mineral Nutrition of Plants: Principles and Perspectives , New York : John Wiley and Sons .
   Google Scholar
• Goyal , S.S. and Huffaker , R.C. 1984 . “ Nitrogen toxirity in plants ” . In Nitrogen in Crop Production , Edited by: Hauck , R.D. 97 – 118 . Madison, Wisconsin : ASA, CSSA, SSSA .
   Google Scholar
• Guan , S. 1986 . Soil Enzymes and the Research Methodology , 294 – 302 . Beijing : Agricultural Publishing House . (in Chinese).
   Google Scholar
• Harper , J.E. 1984 . “ Uptake of organic nitrogen forms by roots and leaves ” . In Nitrogen in Crop Production , Edited by: Hauck , R.D. 165 – 170 . Madison, Wisconsin : ASA, CSSA, SSSA .
   Google Scholar
• Hauck , R.D. 1984 . “ Significance of nitrogen fertilizer microsite reactions in soil ” . In Nitrogen in Crop Production , Edited by: Hauck , R.D. 507 – 519 . Madison, Wisconsin : ASA, CSSA, SSSA .
   Google Scholar
• Islam , A.K.M.S. , Edwards , D.G. and Asher , C.J. 1980 . pH optima for plant growth. Results of a flowing solution culture experiment with six species . Plant and Soil , 54 : 339 – 357 .
   Web of Science ®Google Scholar
• Li , J. 1987 . Advances in soilless plant culture and its perspectives in China . Fujian Agricultural Science and Technology , 6 : 29 – 30 . (in Chinese).
   Google Scholar
• Li , Y. 1983 . Determination of nitrates by ultraviolet spectrometry . Advances in Soil Science , 6 : 44 – 56 . (in Chinese).
   Google Scholar
• Li , Y. 1984 . Methods of Routine Analysis in Soil Science and Agrochemistry , Beijing : Agricultural Publishing House . (in Chinese).
   Google Scholar
• Locascio , S.J. , Wiltbank , W.J. , Gull , D.D. and Maynard , D.N. 1984 . “ Fruit and vegetable quality as affected by nitrogen nutrition ” . In Nitrogen in Crop Production , Edited by: Hauck , R.D. 617 – 626 . Madison, Wisconsin : ASA, CSSA, SSSA .
   Google Scholar
• Maynard , D.N. , Barker , A.V. , Minotti , P.L. and Peck , N.H. 1976 . Nitrate accumulation in vegetables . Adv. Agron. , 28 : 71 – 118 .
   Web of Science ®Google Scholar
• Mothes , K. 1961 . The metabolism of urea and ureides . Can. J. Bot. , 39 : 1785 – 1807 .
   Google Scholar
• Reinink , K. 1991 . Genotype x environmental interaction for nitrate concentration in lettuce . Plant Breeding , 107 : 39 – 49 .
   Web of Science ®Google Scholar
• Resh , H.M. 1983 . Hydroponic Food Production, , 2nd ed. , 60 – 90 . Santa Barbara, California : Woodbridge Press Publishing Company .
   Google Scholar
• Stangel , P.J. 1984 . “ World nitrogen situation‐trend, outlook, and requirements ” . In Nitrogen in Crop Production , Edited by: Hauck , R. D. 23 – 54 . Madison, Wisconsin : ASA, CSSA, SSSA .
   Google Scholar
• Wright , M.G. and Davison , K. L. 1964 . Nitrate accumulation in crops and nitrate poisoning of animals . Adv. Agron. , 16 : 197 – 247 .
   Google Scholar
• Zhejiang Agricultural University . 1979 . Cultivation of Vegetables, South China , 148 – 151 . Beijing : Agricultural Publishing House . (in Chinese).
   Google Scholar
• Corresponding author.
   Google Scholar