1. Sequential extraction of nine trace elements from sludge-amended soils

   • S. El-Demerdashe
   • M. S. A. Dahdoh
   • F. A. Hassan

   OriginalPaper Pages: 77 - 85

2. Using hydrophilic polymers to improve uptake of manganese fertilizers by soybeans

   • Robert L. Mikkelsen

   OriginalPaper Pages: 87 - 92

3. Mineral nutrition of slash pine in subtropical australia. I. stand growth response to fertilization

   • Z. H. Xu
   • J. A. Simpson
   • D. O. Osborne

   OriginalPaper Pages: 93 - 100

4. Mineral nutrition of slash pine in subtropical Australia. II. foliar nutrient response to fertilization

   • Z. H. Xu
   • J. A. Simpson
   • D. O. Osborne

   OriginalPaper Pages: 101 - 107

5. Mineral nutrition of slash pine in subtropical Australia. III. Relationships between foliar P concentration and stand growth

   • Z. H. Xu
   • J. A. Simpson
   • D. O. Osborne

   OriginalPaper Pages: 109 - 115

6. Alkylated ureas: mineralization and evaluation as N sources

   • Praveen-Kumar
   • R. Brumme

   OriginalPaper Pages: 117 - 124

7. Production of phosphoric acid with low content of impurities

   • Ekaterinia Iv. Todorova
   • Ivan P. Dombalov

   OriginalPaper Pages: 125 - 128

8. Effectiveness of rock phosphate, coastal superphosphate and single superphosphate for pasture on deep sandy soils

   • M. D. A. Bolland
   • M. F. Clarke
   • J. S. Yeates

   OriginalPaper Pages: 129 - 143

9. Potential of eppawala apatite as a directly applied low-cost fertilizer for rice production in Sri Lanka

   • K. Dahanayake
   • M. P. K. Ratnayake
   • P. A. Sunil

   OriginalPaper Pages: 145 - 150

10. Long-term residual value of North Carolina and Queensland rock phosphates compared with triple superphosphate

    • M. D. A. Bolland
    • R. J. Gilkes

    OriginalPaper Pages: 151 - 158

11. Electrochemical properties of apatite and other minerals of Zambian phosphate ores in aqueous solution

    • S. Simukanga
    • W. C. Lombe

    OriginalPaper Pages: 159 - 166