トマトおよびナスの花成に関する研究(第4報)

Abstract

Tomatoes1) Tomatoes, cv.‘Shin-Hogyoku No. 2’were grown under constant temperature regimes of 17, 15 and 13°C and at two levels of N, P and K in 1964 to study the interaction of those factors on the differentiation and subsequent development of flower buds.2) The plant growth both in bed soil at 2(NPK) (high level of fertilizer) and in volcanic loam at NPK (low level of fertilizer) was promoted at 17°C and restricted in the lower temperature ranges of 15 to 13°C. The seedlings in the 2(NPK) plot grown under the same temperature were larger than those in the NPK plot. The growth was found to be most remarkable at 17°C in the high level of fertilizer as in the previous report (7).3) The differentiation and its subsequent development of flower buds both in bed soil at 2(NPK) and in NPK plots were accelerated at 17°C and retarded in the lower temperature ranges of 15 to 13°C.4) The differentiation and its subsequent development of flower buds in bed soil at 2 (NPK) plot were earlier than those at NPK plot. The most favorable conditions for them were combination of temperature range of 17°C and high level fertilizer (bed soil at 2(NPK)).5) The number of flower buds per plant was increased at 17°C in high level of fertilizer (the bed soil at 2(NPK)) plot, and decreased at the lower temperature of 15 to 13°C. At the lower level of fertilizer (NPK) plot, it was fewer and there was no difference among the temperature ranges of 17, 15 and 13°C.6) From the results in 1963 and 1964 of tomatoes, it was found that effect of high level of fertilizer on the growth, the differentiation and development of flower buds were most marked at 17°C in the temperature ranges from 30 to 13°C (30, 24, 17, 15 and 13°C).Eggplants1) Eggplants, cv.‘Kisshin No. 2’were grown under constant temperature regimes of 30, 24, and 17°C and two levels of N, P and K in 1965 to study the interaction of those factors on flower bud differentiation and their subsequent development.2) The plant growth both in bed soil at 2(NPK) and in volcanic loam at NPK was promoted most remarkably at 30°C and restricted in the temperature ranges of 24 to 17°C. The seedlings in the 2(NPK) plot were larger than those in the NPK plot.3) The differentiation and its subsequent development of flower buds both in bed soil at 2(NPK) and NPK plot were promoted at 30°C and retarded in the temperature ranges of 24 to 17°C.4) The differentiation and its subsequent development of flower buds in the 2(N PK) plot were earlier than those in the NPK plot. The morphological differentiation of flower buds was not found at the temperature of 17°C in low level of fertilizer (NPK) in this experiment.5) The number of flower buds both in bed soil at 2(NPK) and in NPK was greatest at 30°C and fewer at 24 and 17°C. The 2(NPK) plot had much more flower buds than the NPK plot.6) In case of eggplants, the effect of high level of fertilizer on growth and the differentiation, development and number of flower buds was small under the low temperature of 17°C, but it was very great under the high temperature of 30°C.