@book{40418,
	author = {Brown, J. R. ( Editor) and Proceedings of symposium spondered by divisions S-4, S-8, A1 A4 and the soil testing an plant analysis commtttee (s877) of the American Society of Agronomy and Soil Science Society of America.  and Bates, T. E.,},
	title = {Soil Testing :},
	publisher = {Soil Science Society of America,},
	year = {1987.},
	series = {SSSA Epecial Publication},
	address = {Wissconsin :},
	edition = {1987 edition.},
	note = {incluye: resumenes, bibliografia.}
}