Effect of foliar fertilization with urea and ammonium sulphate on nitrates content in lettuce
2005
Biesiada, A.,Akademia Rolnicza, Wroclaw (Poland). Katedra Ogrodnictwa
In greenhouse experiment there was estimated the effect of N level in substrate (50, 100, 150, 200 mg N/cubic dm) and foliar fertilization with 0.5 percent urea and ammonium sulphate on nitrate content in lettuce leaves. In lettuce grown for early harvest (3.01) lower level of nitrates was obtained on plots foliar fertilized with ammonium sulphate (8.92 percent) but in later harvest double foliar spraying of lettuce with both urea and ammonium sulphate decreased th level of nitrates in lettuce leaves respectively by 12.1 percent and 8.1 percent in March and 15.72 and 14.29 percent in October
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