Developmental Rate Equations for Predicting Bud Bursting Date of 'Campbell Early' (Vitis labrusca) Grapevines
2011
Yun, S.K., National Institute of Horticultural and Herbal Science, RDA, Suwon, Republic of Korea | Shin, Y.U., National Institute of Horticultural and Herbal Science, RDA, Suwon, Republic of Korea | Yun, I.K., National Institute of Horticultural and Herbal Science, RDA, Suwon, Republic of Korea | Nam, E.Y., National Institute of Horticultural and Herbal Science, RDA, Suwon, Republic of Korea | Han, J.W., National Institute of Horticultural and Herbal Science, RDA, Suwon, Republic of Korea | Choi, I.M., National Institute of Horticultural and Herbal Science, RDA, Suwon, Republic of Korea | Yu, D.J., Seoul National University, Seoul, Republic of Korea | Lee, H.J., Seoul National University, Seoul, Republic of Korea
To predict the bud bursting date of 'Campbell Early' grapevines, the bud developmental rate (DVR) models were constructed. The DVRs for bud bursting were calculated from the demanded times at controlled air temperatures. The DVRs were examined on the 'Campbell Early' grapevines incubated in three different temperatures at 4.6, 11.8, and 16.6℃. The DVR increased exponentially or linearly on the air temperature with a slope of about 0.0019. The DVR equations were computed as DVR = 0.0249 + 0.0020e∨0.1654x or DVR = 0.0019x + 0.0187. These DVR equations offered developmental indices and predicted dates for bud bursting with air temperature data. The DVR equations were validated to the bud bursting data observed in the field. When bud bursting dates were calculated with daily temperature data, the root mean squared error (RMSE) between the observed and the predicted dates was less than 4 days. When those were calculated with hourly temperature data, on the other hand, the RMSE was less than 3 days. These results suggest that the DVR models are useful to predict bud bursting date of 'Campbell Early' grapevines.
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