Consejo Superior de Investigaciones Científicas
UNIDAD ASOCIADA "SISTEMAS AGROFORESTALES": ESTACIÓN FITOPATOLÓXICA DO AREEIRO - MISIÓN BIOLÓGICA DE GALICIA
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Home » Publications » Papers » 2005

V Congreso de Ciencias Hortícolas, Porto 2005

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Evaluación del reactivo Mehlich 3 como extractante multielemental.


Pablo Rodríguez , María José Lema, Generosa González , Saleta González Pimentel.

1 Estación Fitopatolóxica do Areeiro , Subida a la Robleda s/n, E-36153 Pontevedra, España. saleta@efa-dip.org.




ABSTRACT:      A multielement extraction is attractive to soil testing laboratories because it eliminates the need for multiple extractions. Few existing extractions such as Mehlich 3 (M3) can be used as a multielement soil-test. This study was carried out to compare soil extractable elements (P, Ca, Mg, K, Na, Cu, Zn and Mn) by M3 method with those extracted by Olsen and Bray P1 methods for P , 1M NH4Cl for Ca, Mg, K and Na and DTPA for Cu, Zn and Mn in 87 agricultural soils in Galicia (Spain). The M3 method correlated significantly to Bray P1 and Olsen (R2 0,76) for avaliable P, highly correlated to 1M NH4Cl for Ca, Mg and K (R2 0,85) but not for Na (R2=0,74), and to DTPA extractable Cu, Zn and Mn (R2=0,97, 0,91 and 0,73 respectively). In the light of the data obtained, the M3 reagent could be recommended for the measurement of this.



Keywords:Olsen, NH4Cl, DTPA, agricultural soils.