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Macronutrient uptake by sorne perennial weeds

Bruno Razeto M.1, Verónica Díaz M.1 y Sylvia Rojas Z.1

The uptake of N, P, K by Sorghum halepense (L.) Pers., Cynodon dactylon (L.) Pers., and Bidens aurea (Ait) Shertt, was determined in two soils of different fertility. Amounts of N, P, K extracted by these weeds were very high, being the highest in S. halepense (L.) Pers.

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1 Departamento de Producción Agricola, Facultad de Ciencias Agrarias y Forestales, Universidad de Chile, Casilla 1004. Santiago, Chile.

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