Crop Load and Efficiency for Light Utilization in the Grape Caused by Different Training
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概要
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An ecological investigation of the relation between crop load and some cultural conditions was made for the grapes"Kyoho" (<I>Vitis labruscana</I> Bailey × <I>Vitis vinifera</I> L.) and"Campbell Eary" (<I>Vitis labruscana</I> Bailey) .<BR>(1) Correlation coefficients (γ) between crop load and the sugar content in juice from the fruit, the percentage of dry matter in the fruit and the total dry matter production were -0.821, -0.734 and +0.875, respectively.<BR>(2) For"Kyoho, "a leaf area of approximately 1200 m<SUP>2</SUP> was necessary to produce 1000 kg of fruit (17°Brix) in cultivation by the horizontal overhead training system. The data of the total dry matter production and the dry weight of the fruit, indicate that 42% or more of the total leaf area in the orchard contributes to the production of fruit.<BR>(3) "Kyoho"grown in Ohbu city during the second half of August took about 5 days to increase 1° Brix, but this tendency to increase leveled off in September.<BR>(4) "Kyoho"cultivated by the horizontal overhead training system in Ohbu city had a small crop load, and the gross sugar production for the total area of the orchard was low. However, fruits of excellent quality were produced at a relatively early stage."Kyoho"cultivated by a modified Munson training system in Mizunami city had an excessive crop load, and the leaf area index was extremely small. As the result, the gross sugar production of the total fruit was large. However, the maturing stage was delayed, and some trees died. An orchard of"Campbell Early"cultivated by a modified Kniffin training system in Aomori had a moderate crop load. In spite of this, there was a large leaf area index and the gross production of sugar was high.<BR>(5) The distribution of light intensity in the orchards and the light-photosynthesis curve for the grape leaves showed that the efficiency for light utilization was very high in the orchard with the modified Kniffin training system, but was low in the horizontal overhead training system.
- 日本生物環境工学会の論文
日本生物環境工学会 | 論文
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