1. The fertiliser economy of high producing pastoral systems

   • K. R. Middleton

   OriginalPaper Pages: 5 - 27

2. Twenty-five years of phosphate and potassium fertilization of a crop rotation

   • Stanley A. Barber

   OriginalPaper Pages: 29 - 36

3. Phosphorus availability from partial acidulation of two phosphate rocks

   • L. L. Hammond
   • S. H. Chien
   • J. R. Polo

   OriginalPaper Pages: 37 - 49

4. Changes in quantity of mineral nitrogen in three grassland soils as affected by intensity of nitrogen fertilization

   • W. H. Prins

   OriginalPaper Pages: 51 - 63