Future directions for agricultural phosphorus research F. J. SikoraP. M. Giordano OriginalPaper Pages: 167 - 178
Soil testing for available phosphorus in soils where phosphate rock-based fertilizers are used R. G. MenonS. H. Chien OriginalPaper Pages: 179 - 187
32P isotopic techniques for evaluating the agronomic effectiveness of rock phosphate materials F. ZapataH. Axmann OriginalPaper Pages: 189 - 195
Agronomic evaluation of modified phosphate rock products S. H. ChienR. G. Menon OriginalPaper Pages: 197 - 209
Agronomic evaluation of fertilizers with special reference to natural and modified phosphate rock E. F. Casanova OriginalPaper Pages: 211 - 218
Cowpea varietal differences in uptake of phosphorus from Gafsa phosphate rock in a low-P Ultisol A. B. AnkomahF. ZapataH. Axmann OriginalPaper Pages: 219 - 225
Factors affecting the agronomic effectiveness of phosphate rock for direct application S. H. ChienR. G. Menon OriginalPaper Pages: 227 - 234
Evaluation of the agronomic effectiveness of natural and partially acidulated phosphate rocks in several soils using32P isotopic dilution techniques N. KatoF. ZapataH. Axmann OriginalPaper Pages: 235 - 242