Prediction of the Developmental Period Related to Budburst, Flowering, and Veraison in the Tetraploid Seedless Grape ‘Azumashizuku’

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  • Sato Mamoru
    Fruit Tree Research Centre, Fukushima Agricultural Technology Centre
  • Takezawa Kunio
    Agricultural Research Center, National Agriculture and Food Research Organization

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  • 四倍体無核ブドウ‘あづましずく’の発芽，開花および着色期の予測
  • ヨンバイタイ ムカク ブドウ'アズマシズク'ノ ハツガ,カイカ オヨビ チャクショクキ ノ ヨソク

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Abstract

Development prediction models using meteorological data were created to examine the growth characteristics of the tetraploid seedless grape ‘Azumashizuku’. It showed that the effective accumulated temperature method, number of days transformed to the standard temperature method and the nonparametric DVR method using the daily mean air temperature can be used to predict the period of time between the budburst day and day coloration started with practical accuracy. It also indicated that the chilling requirement to break endodormancy of budburst in ‘Azumashizuku’ is less than that of ‘Kyoho’. To accurately predict the beginning of anthesis, the sprouting time should be used rather than the foliation time. Regarding the effective accumulated temperature method, developmental zero temperature showed higher predictive accuracy at 0°C by anthesis and at 5°C from full blossom period to the beginning of the coloration start period.

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