Effect of Air Temperature, Air Flow and Uniconazole Spray on the Incidence of Blossom-End Rot of Tomato Fruit.

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The incidence of blossom-end rot (BER) and inorganic nutrient status in tomato, <I>Lycopersicon esculentum</I> L., plants were investigated in relation to air temperatures, air flow and uniconazole (growth retardant) spray. The plant height, plant and leaf dry weight and content of inorganic nutrients increased with a decreasing temperature from 28°C to 24°C, which resulted in drastic reduction in incidence of BER. The spray of 5 ppm uniconazole to leaves also decreased such a disorder of tomato, although the treatment reduced plant height, dry weight of some organs and total fruit yield. The incidence of BER increased with the raising temperature from 24°C to 28°C and air flow over the top of canopy or expanding leaves. On the contrary, the flowing of air over the cluster of tomatoes decreased the incidence of BER. The growth rate (GR) of fruit diameter reached a peack during an early stage, from 13 to 22 days after blooming, of fruit development of tomato grown hydroponically. The incidence of BER was observed during this stage. The maximum value of GR increased with the higher temperature or air flow to the top of canopy of tomato plant, whereas these values were reduced by uniconazole spray. The Ca contents (DW%) in fruit tended to be lower. K contents (DW%) in fruit increased with the increase of BER incidence, whereas their contents were reversely changed by uniconazole spray. Conclusively, the prevention against BER incidence is considered to be established by the air cooling or flowing in the zone only around fruit cluster. Hence, blossom-end rot of tomatoes is caused by faulty nutrition associated with low transpiration stream into fruit and high temperature at an early stage of fruit growth.
日本生物環境工学会の論文

Effect of Air Temperature, Air Flow and Uniconazole Spray on the Incidence of Blossom-End Rot of Tomato Fruit.

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日本生物環境工学会 | 論文

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