Estimation of leaf area index of cucumbers (Cucumis sativus L.) trained on a high-wire
2015
Ahn, D.H. | Higashide, T. | Iwasaki, Y. | Kawasaki, Y. | Nakano, A.
The area of a cucumber leaf is smallest near the growing point and gradually increases basipetally to a maximum value. On this basis, we created a model for easy estimation of leaf area index (LAI) of cucumber trained on a high-wire from the values of individual leaf area, fresh weight, and number of leaves. Individual leaf area was highly correlated with individual leaf fresh weight. There was a difference in individual leaf area at each leaf position between 28 and 69 days after transplanting, but not in RLA (relative leaf area ratio, which represents the individual leaf area divided by the maximum leaf area) at each leaf position. RLA could be estimated from leaf position (n) as RLA = 0.896/1 + (14.811 * e sup(-0.51*n)) There was a significant correlation (r = 0.980, P<0.001) between measured LAI and LAI estimated from integration value of RLA, number of leaves, and individual leaf area of maximum leaf. There was also a significant correlation (r = 0.928, P<0.001) between measured LAI and LAI estimated from integration value of RLA, number of leaves, and individual leaf fresh weight of maximum leaf. We conclude that LAI of cucumber can be estimated from the number of leaves attached to the stem and either the individual leaf area or the fresh weight of the old leaf pruned regularly.
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