稲苗発根力の日変化
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概要
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1) Rice varieties used in this experiment showed such a diurnal fluctuation of rooting activity as the activity of the seedlings picked in the afternoon was superior to those in the morning. The rooting activity was controlled by the diurnal darkness and the temperature before and after picking and transplantation. The darkness was apt to decrease rooting activity, but the light was contrary, and relatively high temperature was effective in promoting the decrease under darkness and the increase under light. It was suggested that a special phytohormone which has relation to rooting activity might be produced when seedlings were picked in the morning and preserved during a day-time under sunshine. It is obvious that the diurnal fluctuation of rooting activity in rice seedlings is originated in the photoperiodical and thermoperiodical range in a day. The effect of light or darkness and temperature on rooting activity was fundamental, and the late application of Ammonium-sulfate to seed-bed, the absorption of α-Naphthalen acetic acid or of 2.4-D somewhat modified it. 2) Temperature of the night during which the keeping of seedlings was done influenced significantly upon the dry matter persentage and total sugar percentage of them, for instance, the high temperature made these percentage to decrease, but the low temperature not always did. The seedlings picked in the morning and kept in seed-bed during a day-time had an increase of the dry matter percentage and total sugar percentage over those picked in morning and immediately followed by transplanting. 3) In field experiments, MM (morning picking and morning transplantation) was always inferior to EE (evening picking and evening transplantation) as to tillers' number, especiallyduring early stage of growth. This superiority of EE to MM plants was, nuder a favorable weather, observed to last to later stage of growth, but under cool and cloudy weather, the superiority of EE to MM at the early stage of growth was not always continued to the later stage. The yield of EE was greater than that of MM under both kinds of weather mentioned above, for the number of ears in EE under a favorable weather was more than that in MM and the size of ear in EE under an unfavorable weather was larger than that in MM.
- 1954-12-20
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