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- W1548780493 abstract "The effect of applying different organic materials (OM) on yield and nitrate content in lettuce was studied in a field experiment on a farm registered for organic production during two years (2007 and 2008). Treatments were: farmyard manure (ST), guano (G), milled soybean (Glicine hispida) seed (S); milled forage pea (Pisum sativum) seed (P) and control treatment (q). Biannual average fresh matter (FM) yield of lettuce on fertilized plots ranges from 45.44 t ha-1 (P) to 46,38 t ha-1 (ST) and was significantly higher than fresh matter yield of the control (39.34 t ha-1), while the differences between fertilized treatments were not significant. Nitrate content in the fresh mass of lettuce in all treatments in both years was below the maximum allowed content (2.500 mg kg-1) regulated by the EU (Commission Regulation (EC), No 466/2001). In both years, the lowest nitrate content in the fresh mass of lettuce was recorded with the control treatment (q) and highest with S treatment. Nitrate contents with G, P and S treatments were significantly higher than that recorded with FYM and q, whereas the differences between FYM and q were not significant in either the first or the second year of research. Linear correlation (r = 0.83**in 2007; r = 0.91** in 2008) was found between the content of mineral N in the soil and nitrate content in the FM of lettuce at the moment of harvesting in both years." @default.
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- W1548780493 date "2010-01-01" @default.
- W1548780493 modified "2023-09-26" @default.
- W1548780493 title "Fertilization effect on yield and nitrate content in organically produced lettuce" @default.
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