1. The Fate of Nitrogen Applied to Soils
2. 3. J. S. Brockman, 1966 . The growth rale of grass as influenced by ferlilizer nitrogen and stage of defoliation.Proc. lOth int. Grassld Congr., Helsinki, 1966pp.234 -40 .
3. 4. P. F. J. Burg, 1966 . Nitrate as an indicator of the nitrogen-nutrition status of grass .Proc. 10th int. Grassld Congr. Helsinki, 1966pp.267 -72 .