Table 3.
Cotton seed micronutrients reserves as influenced by plant density, foliar boron nutrition and mepiquat chloride application.
| Treatments | Seed boron (µg g−1 DW) | Seed zinc (µg g−1 DW) | Seed iron (µg g−1 DW) | Seed manganese (µg g−1 DW) | ||||
|---|---|---|---|---|---|---|---|---|
| 2014 | 2015 | 2014 | 2015 | 2014 | 2015 | 2014 | 2015 | |
| Density (D) (plants ha −1 ) | ||||||||
| 53333 | 48.2 ± 1.1 A | 41.5 ± 0.2 A | 44.8 ± 0.56 A | 44.7 ± 0.56 A | 186.2 ± 2.35 A | 170.7 ± 2.05 A | 21.0 ± 0.30 A | 21.4 ± 0.26 A |
| 88888 | 38.6 ± 1.2 B | 33.0 ± 0.2 B | 42.4 ± 0.63 B | 41.7 ± 0.53 B | 178.8 ± 2.28 B | 164.6 ± 2.12 B | 19.2 ± 0.28 B | 19.9 ± 0.31 B |
| Boron nutrition (B) | ||||||||
| Control | 36.7 ± 1.30 C | 30.8 ± 0.99 C | 41.3 ± 0.60 C | 41.1 ± 0.67 C | 169.6 ± 1.84 C | 158.6 ± 2.34 C | 21.2 ± 0.38 A | 21.8 ± 0.30 C |
| 600 mg/L | 45.2 ± 1.52 B | 38.8 ± 1.37 B | 43.4 ± 0.55 B | 43.4 ± 0.69 B | 184.1 ± 1.74 B | 168.1 ± 1.58 B | 20.1 ± 0.31 B | 20.7 ± 0.31 B |
| 1200 mg/L | 48.3 ± 1.44 A | 42.0 ± 1.38 A | 46.0 ± 0.75 A | 45.2 ± 0.58 A | 193.8 ± 1.81 A | 176.3 ± 2.07 A | 19.0 ± 0.38 C | 19.4 ± 0.33 A |
| Mepiquat chloride (MC) | ||||||||
| Control | 39.5 ± 1.55 C | 33.8 ± 1.26 C | 41.4 ± 0.58 B | 41.4 ± 0.67 B | 178.9 ± 2.68 B | 162.6 ± 2.43 B | 20.7 ± 0.37 A | 21.2 ± 0.39 A |
| Squaring | 46.7 ± 1.86 A | 39.8 ± 1.75 A | 45.2 ± 0.71 A | 44.8 ± 0.70 A | 185.0 ± 2.91 A | 170.6 ± 3.01 A | 19.5 ± 0.40 B | 20.2 ± 0.35 B |
| Flowering | 44.1 ± 1.69 B | 38.1 ± 1.70 B | 44.2 ± 0.76 A | 43.4 ± 0.69 A | 183.6 ± 3.19 AB | 169.8 ± 2.07 A | 20.1 ± 0.43 AB | 20.5 ± 0.40 AB |
| Source of variation (Pr > F) | ||||||||
| D | <0.001 | <0.001 | <0.001 | <0.001 | <0.001 | 0.002 | <0.001 | <0.001 |
| B | <0.001 | <0.001 | <0.001 | <0.001 | <0.001 | <0.001 | 0.001 | <0.001 |
| MC | <0.001 | <0.001 | <0.001 | <0.001 | 0.001 | 0.001 | 0.032 | 0.032 |
| D × B | 0.024 | 0.036 | 0.738 | 0.526 | 0.645 | 0.519 | 0.828 | 0.838 |
| D × MC | 0.128 | 0.034 | 0.999 | 0.967 | 0.764 | 0.653 | 0.746 | 0.744 |
| B × MC | 0.036 | 0.002 | 0.433 | 0.754 | 0.973 | 0.238 | 0.985 | 0.995 |
| D × B × MC | 0.649 | 0.134 | 0.530 | 0.835 | 0.874 | 0.940 | 0.952 | 0.841 |
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.