EFFECT OF AMINO ACIDS REPLACING NITRATE ON GROWTH AND NITRATE ACCUMULATION IN LETTUCE.

Document Type : Original Article

Authors

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

Journal of Soil Sciences and Agricultural Engineering
Volume 7, Issue 3
March 2016
Pages 237-241

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