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The experiment was conducted in the botanical garden of the Department of Life
Sciences/ College of Education for Pure Sciences Ibn Al-Haitham for the growing season 2021-
2020 in order to study the effect of urea and NPK fertilizer on some physiological
characteristics of watercress plants. The seeds were sown on 10/15/2020 in plastic bags
weighing 10 kg of soil. The shoots were sprayed with urea at three concentrations (0, 50, 100)
mg L-1
in two sprays, and NPK fertilizer was added as a ground addition at three levels (0, 100,
200) kg H-1
in two sprays in conjunction with urea spraying. The results of the study showed a
significant effect for the single treatments. The treatment of spraying with urea at a
concentration of 50 mg l-1
. was
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