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Pasture yield responses to sulphur fertilisers in relation to nutrient ratios in white clover
| Content Provider | Scilit |
|---|---|
| Author | Morton, J. D. Sinclair, A. G. Smith, L. C. Thorrold, B. S. |
| Copyright Year | 1998 |
| Abstract | The agronomic performance of triple superphosphate (TSP), superphosphate (SSP), 15%(15SS), 22%(22SS), 33%(33SS), 36%(36SS), and 50%(50SS) S superphosphate, TSP/S, di‐ammonium phosphate (DAP)/S, RPR (North Carolina phosphate rock/S), plus no S or P was measured over three years on a ryegrass/white clover sward near Dipton (mean annual rainfall 1020 mm) in Central Southland, New Zealand. These fertilisers were applied in November 1994, and in September 1996, SSP, TSP, TSP/S, DAP/S, and RPR/S were re‐applied. There was a large pasture yield response to all treatments compared with no S or P, but no significant difference in pasture yield between SSP, 33SS, 36SS, 50SS, and DAP/S. Superphosphate was higher yielding than TSP, 15SS, 22SS, TSP/S, and RPR/S. The rate of S° applied initially was strongly related (r2 = 0.97) to total pasture yield. There were no significant differences in the proportion of S° oxidised 30 months after application between treatments. In the first two years, clover S/P ratios were above the optimum range for balanced nutrition (0.7–0.8) for all fertilisers except 15SS, TSP, TSP/S, DAP/S, and RPR/S. Triple superphosphate, 15SS, and 22SS had clover S/P below the optimum range in the third year. Clover 100 S/N ratios for 33SS, 36SS, and 50SS were in the optimum range (4.8–5.0 for 95–98% RY) for most of the trial and increased into that range for SSP, TSP/S, DAP/S, and RPR/S by the end of the third year. Most other treatments had clover S/N ratios below the optimum range. In this Southland environment there was no pasture yield response from applying extra S° over and above an average of 22 kg sulphate S ha−1 yr−1 (SSP). A lower average rate of 5 kg sulphate S ha−1 yr−1 plus 15 kg S° ha−1 yr−1 (TSP/S, RPR/S), resulted in a reduction in pasture yield compared with SSP. To achieve similar pasture yield to SSP over three years, an initial application of at least 33 kg sulphate S ha−1 and 77 kg S° ha−1 (33SS) was required. |
| Related Links | https://www.tandfonline.com/doi/pdf/10.1080/00288233.1998.9513316?needAccess=true |
| Ending Page | 323 |
| Page Count | 11 |
| Starting Page | 313 |
| ISSN | 00288233 |
| e-ISSN | 11758775 |
| DOI | 10.1080/00288233.1998.9513316 |
| Journal | New Zealand Journal of Agricultural Research |
| Issue Number | 3 |
| Volume Number | 41 |
| Language | English |
| Publisher | Informa UK Limited |
| Publisher Date | 1998-01-01 |
| Access Restriction | Open |
| Subject Keyword | Agronomy Sulphur Fertiliser Superphosphate Pasture Yield Nutrient Ratios Triple Superphosphate Di‐ammonium Phosphate Reactive Phosphate Rock |
| Content Type | Text |
| Resource Type | Article |
| Subject | Agronomy and Crop Science Soil Science Plant Science Animal Science and Zoology |
