Research Article
Determining Critical Soil pH for Grain Sorghum Production
Table 4
Results from quadratic least squares regression when evaluating the effect of soil pH on grain sorghum relative yield (2009 and 2010).
| | DF | Mean square | | Prob | |
| 2009 | Lahoma | 2 | 0.06 | 2.31 | 0.133 | 0.24 | Perkins | 2 | 0.04 | 0.35 | 0.7082 | 0.04 | All locations | 2 | 0.18 | 3.23 | 0.0542 | 0.18 |
| 2010 | Lahoma | 2 | 0.06 | 1.59 | 0.2371 | 0.17 | Perkins | 2 | 1.24 | 37.67 | <0.0001 | 0.83 | Haskell | 2 | 0.25 | 15.65 | 0.0002 | 0.68 | All locations | 2 | 1.12 | 22.82 | <0.0001 | 0.47 |
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