Comparative studies on physiological and ecological characteristics of solanaceous fruit vegetables. (9). Influence of concentration ratios of nitrate nitrogen to ammonium nitrogen on growth, fruit development and nutrients absorption at different night t

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The effects of concentration ratios of NO3-N to NH4-N on plant growth, fruit development and nutrients absorption in tomato (cv. Fukuzyu No. 2), eggplant (cv. Hayabusa) and sweet pepper (cv. Shinsakigakemidori) grown in sand culture at different night temperatures (18°C and 13°C) were investigated using the controlled growth chamber at 25°C in daytime. 1. The concentration ratio of 7 NO3-N: 3 NH4-N promoted plant growth with high yield at 18°C, but both the high concentration ratio of NH4-N and low night temperature inhibited remarkably plant growth, resulted in low yield. Among these crops, the growth and yield were affected by high concentration ratio of NH4-N in tomato and by low night temperature in sweet pepper, respectively. 2. The remarked incidence of fruits with blossom-end rot due to lower Ca content was observed in tomato, especially grown under high concentration ratio of NH4-N at 18°C, but slightly or not in eggplant and sweet pepper. 3. Low night temperature induced more accumulation of NH4-N, but decreased contents of NO3-N, P and K, in the following descending order : sweet pepper, eggplant and tomato.
日本生物環境工学会の論文