Table 1. Descriptive statistics of South Africa’s Agricultural Research Council’s wheat varieties commercially released between 1992 and 2012.
| Variety | Average Yield (kg/ha) | Yield Ratioa | Yield Difference (kg/ha)a | Coefficient of Variation (%) | Year Released to Public | Type | Observations | SD of Yield | Percentage Irrigated |
|---|---|---|---|---|---|---|---|---|---|
| TUGELA DN | 3,123 | - | - | 55.97 | 1992 | Winter | 416 | 1,748.23 | 0 |
| BETTADN | 2,632 | 0.84 | -491 | 49.38 | 1993 | Winter | 2,070 | 1,299.82 | 0.39 |
| GARIEP | 2,818 | 0.9 | -306 | 47.78 | 1994 | Facultative | 2,420 | 1,346.40 | 0.33 |
| LIMPOPO | 2,679 | 0.86 | -445 | 50.66 | 1994 | Facultative | 2,055 | 1,357 | 0.39 |
| KARIEGA | 5,598 | 1.79 | 2,474 | 40.64 | 1994 | Spring | 3,733 | 2,274.98 | 66.33 |
| MARICO | 6,338 | 2.03 | 3,215 | 33.29 | 1994 | Spring | 1,510 | 2,110.16 | 99.27 |
| CALEDON | 2,780 | 0.89 | -344 | 46.7 | 1996 | Facultative | 2,176 | 1,298.22 | 0.37 |
| ELANDS | 2,873 | 0.92 | -250 | 47.6 | 1999 | Facultative | 2,407 | 1,367.65 | 0.33 |
| STEENBRAS | 6,102 | 1.95 | 2,979 | 32.07 | 2000 | Spring | 2,273 | 1,956.85 | 96.48 |
| BAVIAANS | 5,527 | 1.77 | 2,403 | 39.85 | 2001 | Spring | 3,305 | 2,202.30 | 67.08 |
| KOMATI | 2,762 | 0.88 | -361 | 49.67 | 2003 | Facultative | 1,519 | 1,371.96 | 0.53 |
| BIEDOU | 4,671 | 1.5 | 1,548 | 41.67 | 2003 | Spring | 763 | 1,946.57 | 48.23 |
| OLIFANTS | 6,565 | 2.1 | 3,442 | 30.47 | 2003 | Spring | 1,948 | 2,000.29 | 98.56 |
| TARKA | 2,188 | 0.7 | -935 | 49.44 | 2003 | Winter | 262 | 1,081.85 | 3.05 |
| DUZI | 6,772 | 2.17 | 3,648 | 30.61 | 2006 | Spring | 1,893 | 2,072.59 | 94.51 |
| KROKODIL | 7,059 | 2.26 | 3,935 | 30.95 | 2006 | Spring | 1,793 | 2,184.77 | 100 |
| MATLABAS | 3,061 | 0.98 | -62 | 49.6 | 2006 | Winter | 1,258 | 1,518.48 | 0 |
| NOSSOB | 1,732 | 0.55 | -1,391 | 55.28 | 2006 | Winter | 281 | 957.7 | 0 |
| BUFFELS | 7,276 | 2.33 | 4,153 | 29.62 | 2009 | Spring | 833 | 2,155.46 | 100 |
| TANKWA | 3,682 | 1.18 | 558 | 31.79 | 2009 | Spring | 841 | 1,170.38 | 0 |
| SABIE | 7,475 | 2.39 | 4,351 | 26.96 | 2010 | Spring | 843 | 2,015.39 | 98.1 |
| KOONAP | 2,604 | 0.83 | -520 | 47.67 | 2012 | Spring | 358 | 1,241.29 | 0 |
| KWARTEL | 3,715 | 1.19 | 591 | 26.65 | 2012 | Spring | 434 | 989.87 | 0 |
| RATEL | 4,016 | 1.29 | 892 | 26.94 | 2012 | Spring | 431 | 1,081.63 | 0 |
| SENQU | 2,891 | 0.93 | -233 | 48.39 | 2012 | Spring | 235 | 1,398.66 | 0 |
| UMLAZI | 8,021 | 2.57 | 4,897 | 22.9 | 2012 | Spring | 450 | 1,837.05 | 100 |
a Yield ratios are relative to Tugela-DN which was the first variety released in the study in 1992.