Table 3. Cumulative gains of ARC spring, winter and facultative wheat varieties: 1992–2015.
| Year | ARC Spring Irrigated Wheat (Ha)a |
Spring Irrigated Wheat Cumulative Genetic Gain (kg/ha)b | ARC Winter Wheat (Ha)a |
Winter Wheat Cumulative Genetic Gain (kg/ha)a | ARC Facultative Wheat (Ha)a |
Facultative Wheat Cumulative Genetic Gain (kg/ha)b | Price USD/Ton | 2016 USD Prices/Ton |
|---|---|---|---|---|---|---|---|---|
| 1992 | 334,813 | - | 6,631 | 0.00 | 8,066 | - | $250.00 | $428.88 |
| 1993 | 368,953 | - | 20,612 | 112.98 | 200,382 | - | $230.40 | $382.12 |
| 1994 | 420,263 | 0.00 | 22,218 | 179.08 | 148,430 | 0.00 | $212.60 | $344.52 |
| 1995 | 400,307 | 44.92 | 56,428 | 225.97 | 238,609 | 36.44 | $218.60 | $344.58 |
| 1996 | 321,059 | 71.20 | 35,062 | 262.34 | 307,282 | 57.75 | $210.50 | $323.00 |
| 1997 | 181,780 | 89.85 | 37,713 | 292.06 | 229,113 | 72.88 | $177.50 | $264.32 |
| 1998 | 27,226 | 104.03 | 20,091 | 317.19 | 149,071 | 84.61 | $146.20 | $215.27 |
| 1999 | 42,564 | 116.12 | 9,765 | 338.95 | 22,723 | 94.19 | $157.30 | $226.61 |
| 2000 | 10,118 | 126.11 | 2,148 | 358.15 | 6,779 | 102.29 | $167.90 | $234.01 |
| 2001 | 29,661 | 134.77 | 15,097 | 375.33 | 35,954 | 109.31 | $165.20 | $223.88 |
| 2002 | 18,065 | 142.40 | 15,714 | 390.86 | 42,731 | 115.50 | $149.10 | $198.92 |
| 2003 | 21,086 | 149.23 | 1,122 | 405.05 | 27,994 | 121.04 | $188.80 | $246.27 |
| 2004 | 30,133 | 155.41 | 2,158 | 418.09 | 41,746 | 126.05 | $168.90 | $214.60 |
| 2005 | 38,185 | 161.05 | 6,833 | 430.17 | 91,607 | 130.63 | $162.60 | $199.82 |
| 2006 | 83,712 | 166.23 | 5,776 | 441.42 | 33,099 | 134.84 | $225.10 | $267.98 |
| 2007 | 62,719 | 171.04 | 13,678 | 451.94 | 11,808 | 138.73 | $355.70 | $411.74 |
| 2008 | 60,867 | 175.51 | 11,203 | 461.82 | 49,421 | 142.36 | $279.30 | $311.35 |
| 2009 | 74,963 | 179.69 | 3,010 | 471.14 | 15,900 | 145.75 | $189.80 | $212.33 |
| 2010 | 44,187 | 183.62 | 3,845 | 479.95 | 37,396 | 148.94 | $316.10 | $347.92 |
| 2011 | 61,520 | 187.33 | 2,781 | 488.31 | 12,310 | 151.94 | $326.40 | $348.26 |
| 2012 | 40,124 | 190.83 | 2,149 | 496.27 | 5,482 | 154.78 | $354.90 | $371.00 |
| 2013 | 23,703 | 194.15 | 1,499 | 503.85 | 1,652 | 157.48 | $298.30 | $307.33 |
| 2014 | 8,231 | 197.31 | 1,541 | 511.09 | 844 | 160.05 | $281.30 | $285.19 |
| 2015 | 930 | 200.33 | 2,457 | 518.03 | 2,448 | 162.49 | $295.20 | $298.92 |
aAs derived from S1 Table. South Africa does not reported irrigated versus non-irrigated spring wheat area. As such, it was assumed that the total percentage of spring wheat observations in the dataset which were irrigated (78.77%), was equivalent to the total percentage actually sown by producers in South Africa.
bAs derived from Just-Pope Yield coefficient on Table 2