Studies on the mineral nutrition and fertilization of Macroptilium atroporpureum, Galactia striata, and Glycine wightii. I: Diagnosis by subtraction in two soils of São Paulo, Brazil

Abstract

The mineral nutrition of Macroptilium, Galactia, and Glycine wightii was studied in two soils of the State of S. Paulo, Brazil, mamely, a Red Yellow Podzol form Araçatuba (PVA) and a Distrophic Sant Quartz (AQD). By using the technique of diagnosis by subtraction in the greenhouse, the following conclusions could be drawn: (1) different factors limit yield in the two soils; (2) nutritional requirements, efficiency of uptake and utilization of several nutrients are not the same in the three legumes; (3) Ca as a nutrient was required in all cases, except by galactia in AQD; (4) liming AQD to pH 6,5 induced deficiencies of Zn, B, and especially Mn in the case of siratro and galactia.