Interrelationships among several factors responsible for the occurrence of the lateral stripes symptom in small turnips [Brassica rapa]
2008
Takano, Y.(Chiba-ken. Agriculture Research Center (Japan)) | Ino, M.
In this study, the effects of temperature, soil water content, and soil pH on the occurrence of the lateral stripes symptom on the surface of small turnip roots were investigated, and the interrelationships among several factors responsible for the occurrence of this symptom were clarified. 1. The occurrence of the lateral stripes symptom increased due to the drying of soil during the growth period. Therefore, soil dryness was believed to be one of the factors responsible for the occurrence of this symptom. 2. When small turnips were cultivated in dry soil, the lateral stripes symptom occurred frequently only when the soil temperature was high. 3. When small turnips were cultivated in soils with high pH, the lateral stripes symptom occurred frequently only when the soil temperature was high. 4. When small turnips were cultivated during the hot seasons, the occurrence of the lateral stripes symptom was substantially decreased by the use of a thermal insulation net. 5. Based on the abovementioned results, high soil temperature was assumed to be the main factor responsible for the occurrence of the lateral stripes symptom. Further, it was assumed that soil dryness and alkalinity were the factors that promoted the occurrence of this symptom under conditions of high soil temperature.
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