Boron deficiency is not usual in soybean crop in Brazil. The observation reported in this article occurred at Guaíra, State of Sao Paulo, Brazil on a low flat excessively limed and high in organic matter land. The soil boron content in the areas with plant deficiency was 0.06 ppm while in the areas of apparently healthy plants the soil boron content was 0.11 ppm extracted with boiling water. The leaf concentration for deficient and healthy plants was 10 and 19 ppm respectively. Primary leaves of deficient plants were leathery and thick and there was death of the apical buds. There were few flower formation and pod setting. The boron deficient plants were dwarf with thick stems creating difficulty at harvest and soybean yield was considerably reduced.
soybeans; boron; liming