Table 2.
Cotton seed primary macronutrients reserves as influenced by plant density, foliar boron nutrition and mepiquat chloride application.
| Treatments | Seed nitrogen (mg g−1 DW) | Seed phosphorus (mg g−1 DW) | Seed potassium (mg g−1 DW) | |||
|---|---|---|---|---|---|---|
| 2014 | 2015 | 2014 | 2015 | 2014 | 2015 | |
| Density (D) (plants ha −1 ) | ||||||
| 53333 | 32.9 ± 0.23 A | 32.1 ± 0.26 A | 3.9 ± 0.04 A | 3.71 ± 0.06 A | 20.3 ± 0.37 A | 19.0 ± 0.05 A |
| 88888 | 32.2 ± 0.24 B | 31.4 ± 0.22 B | 3.7 ± 0.04 B | 3.40 ± 0.05 B | 18.3 ± 0.34 B | 17.4 ± 0.02 B |
| Boron nutrition (B) | ||||||
| Control | 31.8 ± 0.27 B | 31.0 ± 0.32 B | 3.6 ± 0.05 C | 3.3 ± 0.06 B | 18.2 ± 0.48 C | 17.3 ± 0.31 C |
| 600 mg/L | 32.5 ± 0.26 AB | 31.9 ± 0.27 AB | 3.8 ± 0.04 B | 3.6 ± 0.07 A | 19.2 ± 0.40 B | 18.3 ± 0.32 B |
| 1200 mg/L | 33.3 ± 0.29 A | 32.4 ± 0.25 A | 3.9 ± 0.05 A | 3.7 ± 0.08 A | 20.4 ± 0.49 A | 19.1 ± 0.33 A |
| Mepiquat chloride (MC) | ||||||
| Control | 31.9 ± 0.28 B | 31.1 ± 0.25 B | 3.6 ± 0.05 B | 3.3 ± 0.06 B | 18.1 ± 0.41 B | 17.2 ± 0.29 C |
| Squaring | 33.1 ± 0.27 A | 32.4 ± 0.27 A | 3.9 ± 0.05 A | 3.7 ± 0.08 A | 20.3 ± 0.47 A | 19.1 ± 0.33 A |
| Flowering | 32.6 ± 0.29 AB | 31.8 ± 0.32 AB | 3.8 ± 0.06 A | 3.6 ± 0.07 A | 19.5 ± 0.48 A | 18.3 ± 0.32 B |
| Source of variation (Pr > F) | ||||||
| D | 0.025 | 0.034 | <0.001 | <0.001 | <0.001 | <0.001 |
| B | 0.002 | 0.004 | <0.001 | <0.001 | <0.001 | <0.001 |
| MC | 0.008 | 0.006 | <0.001 | <0.001 | <0.001 | <0.001 |
| D × B | 0.913 | 0.875 | 0.480 | 0.865 | 0.455 | 0.841 |
| D × MC | 0.996 | 0.984 | 0.754 | 0.780 | 0.887 | 0.947 |
| B × MC | 0.957 | 0.998 | 0.715 | 0.167 | 0.821 | 0.941 |
| D × B × MC | 0.834 | 0.986 | 0.316 | 0.388 | 0.461 | 0.974 |
Values are mean ± SE of three replications. Means in a column followed by different letters are significantly different at P < 0.05. Interactions with P < 0.05 are italicized to indicate their significance.