| Item | Regression equation | Sources of variance | Quadratic sum | df | Mean square | F value | P value |
| Polybag-raised rubber seedlings cultivation |
| Return variance | 10435.7478 | 2 | 5188.7783 | 106.6694 | 0 |
| Plant height | Y = 151.1238/(1 + exp(2.1144 − 0.008441t)) | Remaining variance | 449.1744 | 9 | 49.9083 |
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| Total variance | 10884.9222 | 11 | 948.2182 |
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| R = 0.9782 | R2 = 0.9568 |
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| Return variance | 97.9806 | 2 | 49.1819 | 93.7926 | 0 |
| Stem diameter | Y = 42.8505/(1 + exp(2.8662 − 0.162773t)) | Remaining variance | 5.153 | 9 | 0.554 |
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| Total variance | 103.1336 | 11 | 9.4008 |
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| R = 0.9753 | R2 = 0.9512 |
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| Field-sown rubber seedlings cultivation |
| Return variance | 27032.0321 | 2 | 14,103.1011 | 368.4851 | 0 |
| Plant height | Y = 182.6208/(1 + exp(2.5609 − 0.011803t)) | Remaining variance | 332.1691 | 9 | 36.9077 |
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| Total variance | 27364.2012 | 11 | 2435.3507 |
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| R = 0.9938 | R2 = 0.9876 |
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| Return variance | 343.4606 | 2 | 164.2229 |
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| Stem diameter | Y = 30.5550/(1 + exp(2.5715 − 0.007963t)) | Remaining variance | 8.2687 | 9 | 0.9116 |
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| Total variance | 351.7293 | 11 | 29.4591 |
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| R = 0.9874 | R2 = 0.9750 |
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