Effects of global warming on soil temperature rise in autumn on fruit growth, increase of brix and reduction of acidity in 'Miyagawa-wase' satsuma mandarin fruit [Citrus unshiu] under similar conditions
2007
Masamoto, Y.(Ehime-ken. Fruit Tree Experiment Station, Matsuyama (Japan)) | Takagi, N.
The increment of annual mean temperature during the past 58 years at Nanyo Branch of Ehime Fruit Experiment Station is about 1 deg C and has resulted in the longer period of autumn and the earlier start of spring. The warmer winter causes the extended fruit growth of satsuma mandarin and the rind-puffiness. In this work, the relationship between air and soil temperatures of early winter and fruit quality was analyzed by using 'Miyagawa-wase' satsuma mandarin (Citrus unshiu Marc.) trees. In addition, the effects of soil temperature on fruit quality and taste were examined. 1) The maximum air temperature was higher than soil temperature before November but from the beginning of December the reverse was true. The fruit growth stopped after the soil temperature became below 15 deg C. The Brix content in the fruit increased most greatly from late October to middle November in 2005, the drought year, while it increased most greatly from late November to early December in 2003 and 2004, the rainy autumn years.
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