"Spray applications of nitrogen and boron during reproductive stages of soybeans, as well as fertigation and dribble applications have resulted in significant yield and seed protein responses." 1
1- Gascho, G. 1993. Boron and nitrogen applications to soybeans: Foliar and through sprinkler irrigation, pp. 17-33 in Murphy, L.S. (ed.) Foliar Fertilization of Soybeans and Cotton, Potash and Phosphate Inst. Tech. Bull. 1993.