Status and Causes of Soil Salinization of Irrigated Agricultural Lands in Southern Baja California, Mexico

Table 6

Mineralogical composition of soil.

	Qtz	Bi	Kfs	Pl	Cal	Kln	Ill	Sm	Vt
Site 1
Surface soil	+	+	++++	++++	tr	+	++	+	+
Subsoil	+++	tr	++	++	tr	+	++	+	+
Site 2
Surface soil	+++	+	++	++	tr	tr	++	tr	tr
Subsoil	+++	+	+	+	tr	tr	++	tr	tr
Site 3
Surface soil	+++	+	++	++	tr	tr	++	tr	tr
Subsoil	+++	+	+	+	tr	tr	++	tr	tr
Site 4
Surface soil	+++	+	+++	+++	tr	tr	++	tr	tr
Subsoil	+++	+	++++	++++	tr	tr	++	tr	tr
Site 5
Surface soil	++++	+	+	+	tr	tr	++	tr	tr
Subsoil	++++	+	+	+	tr	tr	+++	tr	tr

Qtz: quartz; Bi: biotite; Kfs: K-feldspar; Pl: plagioclase; Cal: calcite; Kln: kaolinite; Ill: illite; Sm: smectite; Vt: vermiculite; tr: trace mineral phase.