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Effects of source and amount of fertilizer nitrogen and nitrification inhibitors on the yield and nitrate concentration of glasshouse lettuce
Author(s) -
Vaughan J.
Publication year - 1985
Publication title -
soil use and management
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.709
H-Index - 81
eISSN - 1475-2743
pISSN - 0266-0032
DOI - 10.1111/j.1475-2743.1985.tb00662.x
Subject(s) - nitrification , nitrate , chemistry , urea , nitrogen , ammonium , agronomy , ammonium nitrate , greenhouse , yield (engineering) , fertilizer , horticulture , biology , metallurgy , materials science , organic chemistry
. Urea and ammonium were compared with and without nitrification inhibitors (nitrapyrin and dicyandiamide) as a possible means of reducing the nitrate concentration in winter lettuce grown in the glasshouse. Neither inhibitor had a significant effect on nitrate concentrations at the lower rate of applied nitrogen (138 kg ha −1 N). At the higher rate of urea (414 kg ha −1 N) dicyandiamide significantly reduced the nitrate concentration but this was accompanied by an unacceptable loss in yield and quality thought to be due to phytotoxic effects of the high level of residual ammonium. Nitrapyrin had no effect on the nitrate concentrations in lettuce.