黃色 葉煙草 主産地 土壤에 對한 調査硏究 : 淸州 葉煙草 生産組合管內 土壤에 對하여 For Fields of the Tobacco producers' Cooperative area in Cheungju = A Survey on the Soil Characteristics of Main Tobacco Plant (Y.S.A) Producing Fields

다국어 초록 (Multilingual Abstract)

With the aim of surveying soil characteristics of main Y.S.A-producing fields, the results obtained from the soils in the Cheungju-Cheungwon-gun producers' cooperative area are summarized as follows :
1.The results obtained from the present survey of soils were not consistent with the originalgrades designated as A, B and C by the producers' cooperative.
2.Particularly in terms of the relationship between cultivation periods(yrs) and yields, the yields in normal-productive soils decreased gradually with time, whereas no such tendency was observed in the low-productive soils. Pest damages were noticeable in the case of the low-productive fields.
3.Physical properties showed that the depths of surface soils were, on average, over 20cm in both normal and low-productive fields, the former being a little deeper. In soil texture, in general most of them were coarse sandy soils, low-productive fields abounding in clayey soils.
4.Chemical properties indicated that both normal and low-productive soils were strongly acidic, Mostly the latter having lower pH's than the former to be pH 4.6~5.0. Proportionally, exchangeable base and degree of base saturation of low-productive soils were lower than those of normal soils. This seems to be the cause of low-productivity in terms of soil itself. Contents of total nitrogen, available phosphorus, and humus were very low and far below the average contents of field soils of this country.
No difference was recognized between normal and low-productive soils.

목차 (Table of Contents)

• 緖言
• 材料 및 方法
• 1.調査對象地 및 代表土壤의 選定
• 2.調査方法
• 調査結果 및 考察
• 1.葉煙草 栽培現況
• 2.잎담배 栽培地 土壤의 物理的 性質
• 3.잎담배 栽培地 土壤의 化學的 性質
• 摘要