Studies on the water balance in Satsuma orange trees. III

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  • SUZUKI Tetsuo
    Aichi Agricultural Center, Utsumi Branch, Minamichita Faculty of Agriculture, Nagoya University
  • KANEKO Mamorn
    Aichi Agricultural Center, Utsumi Branch, Minamichita Faculty of Agriculture, Nagoya University
  • TORIKATA Hirotaka
    Aichi Agricultural Center, Utsumi Branch, Minamichita Faculty of Agriculture, Nagoya University

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Other Title
  • 温州ミカンの水分均衡に関する研究 (第3報)
  • 温州ミカンの水分均衡に関する研究-3-地表面かん水または葉面散水処理による葉のW.S.D.の経時的変化
  • ウンシュウ ミカン ノ スイブン キンコウ ニ カンスル ケンキュウ 3 チヒョウメン カンスイ マタハ ヨウメンサン ミズ ショリ ニ ヨル ハ ノ W.S.D. ノ ケイジテキ ヘンカ
  • Changes in leaf water saturation deficit after watering to the soil or during sprinkling water upon leaf surface

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Six-8 years old Satsuma orange (Ôiwa No. 5) plants which were grown in earthen ware pipes (60cm in diameter×60cm in depth) filled with sandy loam were used in this experiment. Experiments were repeated during July of 1966, August of 1967 and January of 1968 in the dry season. An attempt in the experiments is to decide which watering methods should be taken for keeping water balance in a leaf.<br>Before experiments, the soil was allowed to dry out gradually by withholding irrigation and keeping out of rainfall untill the visible wilting took place. At the beginning of experiments, watering to plants was conditioned by two methods:<br>1) by supplying to the soil and 2) by sprinkling upon leaf surface. The soil in control plots had been moistened by flooding water near to its field capacity. The water saturation deficits (W. S. D.) in leaves were measured by modified ACKLEY′s and RUTTER and SANDS′s method. Their results are as follows:<br>In the summer experiments, decrease in leaf water deficits was apparent at 30 minutes after watering to soil. In one hour after treatment there was little difference in leaf water deficits between treated and control plots. While increase in leaf water contents had occurred in a brief period after treatment. This tendency was also shown in the winter experiments. However, it took more time to reach the same value in water content or W. S. D. as control plants.<br>W. S. D. and water content in leaves during sprinkling water upon leaf surface reached the same value 3 and 2 hours, respectively, after start of sprinkling water without regard to season.<br>From these results, watering to plants to correct the water deficit in leaves is better to supply to the soil in summer and to sprinkle upon leaf surface in winter. It may be concluded that the greater efficiency in practice can be obtained by sprinkling water overhead both to soil and upon leaf surface.

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