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Yield and leaf nitrate levels of lettuce grown with different sources of nitrogen



Yield and leaf nitrate levels of lettuce grown with different sources of nitrogen



Horticultura Brasileira 16(1): 65-68



In a greenhouse trial carried out at the Maranhao State University (UEMA) in 1994, lettuce Aurelia plants, in 2-dmsuperscript 3 pots, were supplied with organic manure (sewage sludge, poultry manure, Azolla sp. plants or Leucaena leucocephala leaves) applied at 10 g/dmsuperscript 3 or inorganic N (as urea or ammonium sulfate) at 50 mg N/dmsuperscript 3. All treatments received a basal dressing of 250 mg P2O5/dmsuperscript 3 + 75 mg K2O/dmsuperscript 3 + micronutrients.

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