Articles
Establishing a winter cultivation method for guava in unheated greenhouses: verification through sap flow measurement
Article number
1419_4
Pages
27 – 32
Language
English
Abstract
Guava (Psidium guajava L.) is difficult to grow in Japan, except in sub-tropical regions.
Cultivation has been attempted for three years in Shizuoka, in the central part of the country.
In 2018, ten seedlings were planted, and in the fall of 2020, a yield of 30.3 kg was obtained with fully open field cultivation.
This was due to the relatively warm minimum temperature of -1.6°C during the winter of 2019-2020. In the following year, 2021, the canopies were covered with nonwoven fabric in the winter, but no yield was obtained.
Therefore, in 2022, individual sunlight greenhouses were introduced for 8 guava trees.
The heat from the sun during the daytime was collected in a heat storage medium and non-heating system that mitigated the temperature by internal radiation.
A yield of 42.7 kg was obtained from the 7 plants due to the effect of the sunlight greenhouse and irrigation.
These growth conditions were synchronized with the results of sap flow measurements, showing significant sap flow during the winter months in 2022, compared to almost no sap flow in 2021. In addition, in the winter of 2022, we successfully overwintered 6 guavas in a tunnel-type sunlight greenhouse that included existing stairs from farm work.
Although the outside temperature dropped to -5°C, the inside of the greenhouse was kept above 0°C without heating, and the leaves remained green.
Sap flow in these trees indicated quite high levels in May.
From the above, it was shown that it is possible to expand the area where guava can be cultivated by using an unheated greenhouse that is effective only in winter.
Cultivation has been attempted for three years in Shizuoka, in the central part of the country.
In 2018, ten seedlings were planted, and in the fall of 2020, a yield of 30.3 kg was obtained with fully open field cultivation.
This was due to the relatively warm minimum temperature of -1.6°C during the winter of 2019-2020. In the following year, 2021, the canopies were covered with nonwoven fabric in the winter, but no yield was obtained.
Therefore, in 2022, individual sunlight greenhouses were introduced for 8 guava trees.
The heat from the sun during the daytime was collected in a heat storage medium and non-heating system that mitigated the temperature by internal radiation.
A yield of 42.7 kg was obtained from the 7 plants due to the effect of the sunlight greenhouse and irrigation.
These growth conditions were synchronized with the results of sap flow measurements, showing significant sap flow during the winter months in 2022, compared to almost no sap flow in 2021. In addition, in the winter of 2022, we successfully overwintered 6 guavas in a tunnel-type sunlight greenhouse that included existing stairs from farm work.
Although the outside temperature dropped to -5°C, the inside of the greenhouse was kept above 0°C without heating, and the leaves remained green.
Sap flow in these trees indicated quite high levels in May.
From the above, it was shown that it is possible to expand the area where guava can be cultivated by using an unheated greenhouse that is effective only in winter.
Publication
Authors
S. Takeuchi, M. Kogure, H. Fujimaki
Keywords
devastated tea garden, fresh fruit, sunlight greenhouse, overwinter, heat ratio method
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