Investigation of Sericultural Foundations in Yuyu Village Located in Sanne myun, Buan gun, Jeonbuk I. About Some Chemical Characteristics of Soil and Fertilizer Rate applied on Mulberry Field

양잠전업부락 부안군 산내면 유유마을의 실태에 대한 조사보고 I. 뽕밭 토양의 화학성분과 시비실태에 관하여

This investigation was conducted to know the present conditions of the the chemical components in the soils and chemical fertilizer rates applied in the Yuyu village located Sanne myun, Buan gun, Jeonbug province. Total silkworm rearing farms in this village were 54 and 47 of them were chosen at random. Average fertilizer rate applied in this village was 40.8-13.7-13.9kg/10a as N-P$_2$O$\_$5/-K$_2$O. Farmers seemed to stress too much to nitrogen fertilizer. Available P$_2$O$\_$5/ in soils was below 7ppm (by Bray No. 1 method). However, 47% of the farms applied phosphate fertilizer less than 11kg/10a. The average of exchangeable K in soils was 0.68me/100g. Nine of the farms applied potassium fertilizer more than 20kg/10a and 7 farms of them had the soils contained above 0.4me/100g as the potassium content. The average soil pH was 5.3. All of the soils were below than pH 6.5. Exchangeable Ca and Mg were 3.62 and 0.83me/100g, respectively. The average lime requirement was 269kg/10a. The average organic matter content was 2.55% and for 72% of the total farms, organic matter content was below than 3%.

본 조사는 양잠전업마을인 전북 부안군 산내면 유유마을의 시비실태와 토양화학성을 조사분석하여, 시비양개선과 토양개량을 통해 생산성을 증진하기 위한 기초자료로 쓰기 위해 수행되었다. 그 결과는 다음과 같다. 이마을 전체 금비시비량은 N-P$_2$O$_2$-K$_2$O로 환산하여 40.8-13.7-13.9kg/10a로 질소를 편중시비하는 경향이었다. 토양중의 유효인산은 모든 농가가 7ppm이하였으나, 47% 농가가 11kg 미만의 인산질비료를 시비하였다. 토양중의 치환성 K는 평균 0.68me/100g으로 비교적 높으며, 20kg 이상의 칼리질을 시비하는 9개 농가 중 7개 농가가 0.4me/100g 이상이었다. 토양의 평균 pH는 5.3이었고, 전농가의 토양이 pH6.5 이하로 낮은 경향이었다. 치환성 Ca와 Mg는 각각 3.62, 0.83me/100g으로 매우 낮았고, 10a당 석회소요량은 269kg이었다. 평균 유기물함량은 2.55%이며, 72% 농가는 3% 미만이었다.