Effect of solar soil disinfection using Sudan grass blending in Ginseng Rain-sheltered Shade House

The Ginseng Rain-sheltered Shade House is one of the efficient cultivation techniques as reducing the damages caused by natural disaster such as blight, high temperature & humidity, dry, and heavy rain & snow. However a soil description needs to be developed to reduce the period of re-cultivation because ginseng has to be cultivated at the only one ginseng rain-sheltered house without soil or cultivation change.

This study was carried out in the ginseng rain-sheltered house where ginseng had cultivated and harvested one time. Each section of cultivation of sudan grass+flooding, rice straw+flooding, and flooding was covered with vinyl and then, all areas were solarized through the summer season. The soil temperature was inspected at 5 cm, 10 cm, 15 cm, and 20 cm below ground. As a result, the soil temperature of the place with vinyl covered and solarized was approached to 40 °C repeatedly during the period of high temperature in July and August. In the sudan grass+flooding treatment, the number of days in which the soil temperature exceeded 40 °C was 21 days at the depth of 20 cm underground. After the solar disinfection, the inspection result of Cylindrocarpon destructans spore density checked by Real time PCR was that C. destructans spores were not found at the place where sudan glass+flooding, and rice straw+flooding were used. However, the detected number of C. destructans spores in the inspection condition was roughly 9 at the soil samples from the fields which were flooded and solarized, and 33 at those from the repeatedly cultivated fields. The evaluations of aerial part growth by measurements were good in the following order: Sudan grass+flooding, rice straw+flooding and flooding. The evaluations of root weight by measurements were heavy in the following order: Rice straw+flooding, sudan grass+flooding and flooding. The incidence rate of the pathogens distantly decreased by the treatments of sudan glass+flooding and solar disinfection.