Investigation on disordered tomato [Lycopersicon esculentum] fruits in drained paddy field for upland crop to control their appearance
2001
Nakamura, R. (Hokkaido. Government Office, Sapporo (Japan)) | Okubo, S. | Hirai, G.
The appearance of disordered tomato fruits, welted or pitted fruits, which is called "chakkuka" and "madoakika", have been a big problem in drained paddy field for upland crop cultivation of TAKIKAWA area since 1998. We investigated the field condition and cultivation method and concluded that these disordered fruits are caused by low Ca content in the fruits. The methods to increase supplement of calcium to fruits are summarised as follows: 1. Deeplow subsoil to improve drainage and to expand effective soil depth to increase absorption of Cafromsoil. 2. Supply water and fertilizer in short interval to prevent radical change of these concentration in soil and crop. 3. Keep exchangeable Ca, Mg and K content of the soil moderately. High Ca content and low Mg or K content is desirable. 4. Control air and soil temperature by ventilation and using plastic mulch film especially in early stage.
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