In spring 2021 we planted the saplings of highbush blueberry (Vaccinum corymbosum L.), cultivar 'Duke', into six green and six white growing bags. In three green and three white bags, we placed sensors to measure the amount of water and the temperature in the substrate. The purpose was to find out how does the colour of the growing bags affect the conditions in the substrate and with this also the development of highbush blueberry and how does the temperature of air and soil, on which are the bags with planted plants, affect the conditions in the substrate. The highbush blueberries, which had been planted in the white bags, had higher average growth of sprouts per plant than the blueberries planted in the green bags (by 10,5 cm). In the research we didn't confirm the affect the northern or the southern side on the development on the root system in the bag of substrate. The substrate in the white bags had a lower average temperature than the substrate in the green bags (by 5 °C) and contained more water in measured timespan (by 5,8 %). The change in temperature in the growing bags in winter followed the change in soil temperature. The temperature in the substrate was affected by both the air temperature and the soil temperature. In spring, the substrate in the green bags had warmed up a bit faster than the substrate in the white bags and had a higher average temperature (by 1,5 °C).
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