Year-round production of tomato fruits by low node-order pinching and high-density planting in subtropical area in Japan

H. Yamaura, S. Fujita, K. Ikeda, N. Takano, K. Kanno, S. Matsuo, T. Zhao, A. Nakano, Y. Iwasaki
We aim to establish a cultivation method for producing Japanese tomatoes throughout the year using a tunnel-type greenhouse. It is difficult to produce tomatoes through a year under high air temperature and high relative humidity region like Asian monsoon including Japan. In general, high daily mean temperature like 22°C or above induces decreasing tomato yield and fruit quality. We approached this challenge by the low node-order pinching and high-density planting system which was pinched after flowering of the fourth truss to leave 2 leaves. We cultivated Japanese tomato three times throughout the year at Ishigaki island which is at the southernmost tip of Japan belonging to the Asian monsoon area. The first cultivation time(period I) was from January 18 to April 26, the second time(period II) was from June 26 to September 27 in 2018 and the third time (period III) was from October 18, 2018 to January 28, 2019. Distance between the plants was 0.143 m in the cultivation period I and III, but period II was adjusted to 0.125 m (plant density was 4.4 and 5.0 plants m‑1, respectively). And we obtained environment data in greenhouse and tomato morphological data in each cultivation. We then analyzed the relationship between the cultivation environment and tomato growth. As the daily mean temperature was getting higher, the fruit size was getting smaller and the dry matter allocation to the fruits tended to decrease. Furthermore, we input the data we obtained by the experiments into the tomato growth model we created. We continue to verify the effects of temperature and solar radiation on plant growth and yield.
Yamaura, H., Fujita, S., Ikeda, K., Takano, N., Kanno, K., Matsuo, S., Zhao, T., Nakano, A. and Iwasaki, Y. (2020). Year-round production of tomato fruits by low node-order pinching and high-density planting in subtropical area in Japan. Acta Hortic. 1296, 457-462
DOI: 10.17660/ActaHortic.2020.1296.59
https://doi.org/10.17660/ActaHortic.2020.1296.59
dry matter production, Asian monsoon, dry matter allocation to fruits, high daily mean temperature, high solar radiation, Japanese tomato cultivar
English

Acta Horticulturae