@book{1883,
	author = {International Plant Nutrition Colloquium and Beusichem, M. L. van, },
	title = {Plant nutrition :},
	publisher = {Kluwer Academic, },
	year = {1990},
	series = {Developments in plant and soil sciences ;},
	address = {Dordrecht :},
	note = {Proceedings of the eleventh International plant nutrition colloquium, 30 july - 4 august 1989, Wageningen, The Netherlands}
}