EFFECT OF AMINO ACIDS REPLACING NITRATE ON GROWTH AND NITRATE ACCUMULATION IN LETTUCE. | ||||
| Journal of Soil Sciences and Agricultural Engineering | ||||
| Article 1, Volume 7, Issue 3, March 2016, Page 237-241 PDF (625.31 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/jssae.2016.39400 | ||||
 View on SCiNiTO | ||||
| Authors | ||||
| Y. Abdel-Aal; S. Abou-Zeid; Amal Abd El-Latif; Shaimaa El-Sapagh | ||||
| Soil Science Dept., Faculty of Agriculture, Cairo University, Giza, Egypt. | ||||
| Abstract | ||||
| A study was carried out to determine the influence of nitrogen (N) sources on the growth and nitrate (NO3−) accumulation of lettuce iceberg (Lactuca sativa) in nutrient film technique (NFT). Plants were supplied with treatments NO3− and six amino acids (AA)treatments, [glutamic acid (Glu), glutamine (Gln), alanine (Ala), glycine (Gly),aspartic acid (Asp) and argnine (Arg)] , at three NO3−-N/AA-N ratios:(1) 100:0, (2) 80:20 and (3) 60:40.The total N concentration was 12.5 mmol L-1 for all treatments in nutrient solution. All AAs reduced plant growth with decreasing NO3− -N/AA-N ratios compared to the 100% NO3− treatment. Fresh and dry weight of shoot and root were significantly lower in Glu treatment than in all other treatments when NO3−-N/AA-N ratios were 80:20 and 60:40. Decreasing NO3− -N/AA-N ratios reduced NO3− concentrations in fresh shoot, regardless of AA sources. Plants grown in (Glu) treatment had lower NO3−concentrations in fresh shoot than grown in all other treatments when NO3−-N/AA-N ratio was 80:20 only. | ||||
| Keywords | ||||
| Amino acids; nitrate; accumulation and lettuce | ||||
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