The influence of calcium spray fertilization on the freezing temperature (°C) causing 50% electrolyte leakage (LT50) from stem tissue of apple (Malus cv. Golden Crown) growing under field conditions.z
| Treatment | 18 December 2004 | 18 January 2005 | 9 February 2005 |
|---|---|---|---|
| Control | −27.4 (−17) | −30.8 (−24) | −31.0 (−24) |
| Silwett | −27.8 (−18) | −30.8 (−24) | −30.5 (−23) |
| Calcium chloride | −30.6* (−23) | −34.1* (−30) | −32.5 (−27) |
| Calcium sulphate | −29.9 (−22) | −32.1 (−26) | −32.2 (−26) |
| Calcium nitrate | −29.6 (−22) | −31.2 (−24) | −32.4 (−27) |
| Calcium nitrate borate | −30.8* (−24) | −33.9* (−30) | −33.5* (−29) |
| Calcium hydroxide | −31.7* (−26) | −34.0* (−30) | −34.6* (−31) |
| Calcium metalosate | −31.1* (−24) | −32.7 (−27) | −34.8* (−32) |
| Calcium-magnesium complex | −28.7 (−20) | −31.5 (−26) | −33.7* (−30) |
↵zMeans that are significantly different from the control using Duncan’s multiple range test (P = 0.05) are indicated with an asterisk.
All values mean of eight trees, three stems per tree.
Values in parenthesis = °F (two significant figures).