抄録
From Sept. 1950 to March 1951 experiments were carried out to explain the impossibility of succession cropping of the wild horse-radish due to the growth hindrance in some parts of the mountain district, Fukui prefecture, performing various observations and investigations, manure tests, and spectro-analysis to crop plants and soil in which they were cultured. The results are summarized as follows: 1. From microscopic and other tests, this hindrance seemed to be physiological and to be caused by the deficiency of nutrient substances. 2. This hindrance was scarcely recognized in the soil from granite and quartzite, but mainly from sand rock. 3. N, P, K and Ca were hardly recognized to be efficacious for this hindrance. 4. This hindrance seemed to be caused by the deficiency of many metallic elements, available and essential, especially Mg, Mn, Zn, etc. from the results of specrto-analysis to crop plants, soil, and extracted soil by 0.3 mol acetic acid in which they were cultured.
