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제주도 감귤원 토양의 V.A-mycorrhizae분포 및 사상균에 의한 인광석의 용해에 관한 연구
김형옥,유장걸,이신찬,R.M.N. Kucey 제주대학교 1984 논문집 Vol.17 No.-
The mycorrhizae spore densities (spore numbers/100g soil) were measured on six sites of citrus field by the floating method to estimate the mycorrhizae distniution on volcanic ash soil in Jejudo. Phosphate solubilizing fungi and bacteria in the soils were isolated and selected by the succesive pure culture in the potato dextrose agarcalcium phosphate (PDA-P) media. The phosphate solubilizing capacities of the sele-cted fungi were measured after incubating in the liquid media mixed with 200 mg of powdered rock phos-phate for one week. 1. The highest spore density (456/100g soil) was observed in the soil from the 6 years citrus field located on Samyangdong, Jeju-si and the next one (385/100g soil) from the 18 years citrus field at the same place. The soils from Topyeongdong, Seogwipo-si (1)(2) were found to contain lower mycorrhizae spores than other sampling sites, 256/100g soil at seven years citrus field and 166/10g soil at twenty one years citrus field. 2. Colony radii and halo radii of bacteria measured 4mm - 11mm and 6mm-22mm, and colony radii and halo radii of fungi were 8mm-12mm and 14mm-18mm respectively when they were incubated in PDA-P media for one week. 3. The selected fungi, based on the radius size of colony and halo, dissolved 0.46mg-2.64mg P_(2)0_(3) from 200mg of powdered rock phosphate in the liquid media.
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Phosphorus Retention in Cheju Volcanic Soils
쿠시,柳長杰 제주대학교 방사능이용연구소 1985 연구보고 Vol.1 No.-
濟州道의 火山灰土인 黑色 및 褐色土에 ??P로 標識된 燐酸을 加해주기 前과 後에 침출력이 서로 다른 용액으로 침출시켰다. 加해준 燐酸은 水溶性分劃에서 速히 除去되엇고 첨가해준 大部分의 燐酸은 14日間에 걸쳐 土壤에 吸着되었다. 酸溶解性 燐酸은 낮은 편이었는데 褐色土에서는 時間이 경과함에 따라 증가하는 경향이었다. 첨가해준 인산이 침출액에 의해서 침출되는 정도는 黑色土에서 33%이었고 褐色土에서는 66%정도이었다. Phosphorus was extracted from two volcanic ash soils by solutions of different strengths before and after the addition of ?? phosphate. The added P disappeared rapidly from the water soluble fraction. Adsorbed P contained the majority of the added phosphorus during the 14-day experiment. Acid soluble P was low but slowly increased during the experiment. Only 33 and 66% of the added P was recovered by the extracting solutions from the black and brown soils respectively.
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