ハウスおよび露地で生育したカキ'前川次郎'の果実肥大と気温との関係(栽培管理・作型)  [in Japanese] Relationship between Air Temperature and Fruit Growth of 'Maekawa Jiro' Persimmon Grown in a Plastic House or Open Field(Crop Production & Cropping Type)  [in Japanese]

加温ビニルハウスまたは露地で生育したカキ'前川次郎'について,満開後50日から収穫期までの果実肥大と気温との関係を解析した.平均気温は果実成長第I期にはハウス区が露地区より低かったが,第II期以降はハウス区の方が高く推移した.果実成長第I期の長さは,満開後の日数で表すとハウス区が露地区より長かったが,満開後の積算温度で表すと両処理区とも約2,300℃・日であり,積算温度と果径日増加量との間の関係は両処理区で近似する一次回帰式で表された.一方,果実成長第II〜III期においては,ハウス区,露地区ともに,果径日増加量と平均気温との間に負の相関が認められ,関係が認められた時期の長さはハウス区の方が長かった.このことから,ハウス区では露地区に比べて,高温によって果実の肥大が抑制される期間が長いことが示された.

Fruit growth of 'Maekawa Jiro' persimmon (Diospyros kaki Thunb.) grown in either a heated plastic house or open field was analyzed in relation to changes in air temperature during the period from 50 days after full bloom to fruit harvest. Air temperature in the plastic house was lower than that in the open field during fruit growth stage I, but the reverse conditions were observed thereafter. Both the plastic house- and field-grown fruits reached the end of the fruit growth stage I when the cumulative mean air temperature after full bloom reached 2,300℃・days, and the linear regression equations describing the relation between the daily increment of fruit diameter and the cumulative mean air temperature was quite similar. After fruit growth stage II, both plastic house- and field-grown fruits showed negative correlations between the daily increment of fruit diameter and mean air temperature, and the period when the growth of the plastic house-grown fruits was inhibited by high temperature was longer than that of the open field-grown fruits.