Table 4.
Correlations between aged area and FFB yield from 2009 to 2019 (refer to Appendix A, Table A1 for further details).
| Replanting Scenario | Correlation Coefficient |
p-Value | Replanting Years Needed to Break the Correlation with Declining Yield |
|---|---|---|---|
| No replanting (Figure 5) | −0.715 a | 0.0135 * | - |
| Replant 100,000 hectares/year | −0.673 b | 0.0233 * | 0 |
| Replant 105,000 hectares/year | −0.711 b | 0.0142 * | 0 |
| Replant 110,000 hectares/year | −0.650 a | 0.0305 * | 0 |
| Replant 115,000 hectares/year | −0.577 a | 0.0631 | 7 |
| Replant 120,000 hectares/year | −0.440 a | 0.1751 | 7 |
| Replant 125,000 hectares/year | −0.225 a | 0.5052 | 7 |
| Replant 130,000 hectares/year | 0.022 a | 0.9494 | 7 |
| Replant 135,000 hectares/year | 0.225 a | 0.5058 | 6 |
| Replant 140,000 hectares/year | 0.362 a | 0.2737 | 6 |
| Replant 145,000 hectares/year | 0.418 b | 0.2006 | 6 |
| Replant 150,000 hectares/year | 0.518 b | 0.1025 | 6 |
* Correlation is significant at α = 0.05. a Pearson correlation coefficient (for normally distributed variables). b Spearman’s rho correlation coefficient (for non-normally distributed variables).