1. GORFINIUEL, E., and POLLARD, A. G. (1952). A modified procedure for determining boron in plant material and soils using 1: 1 —dianthrimide.J. Sci. Fd Agric., 3, 622–4. GORFINKIEL, E., and POLLARD, A. G. (1954). The 1 : 1 —dianthrimide method for deter-mination of boron in soils: Further observations.J. Sci. Fd Agric., 5, 136–9.
2. HESTER, J. B., and HALL, H. F. (1942). Quality tomatoes through sound farming practices.Bull. 4, Campbell Soup Co., Riverton, New Jersey.
3. MESSING, J. H. L. (1956). Boron in the nutrition of tomatoes.Rep. Glasshouse Crops Res. Inst. for 1952–5, 79–84.