뽕나무 接木苗에 關한 硏究 : Ⅰ.活着不良桑苗 發生 苗圃地의 土壤特性에 關한 硏究 Ⅰ.Soil Characteristics of Nursery Garden Producing Nonsprouting Sapling = Studies on the Mulberry Sapling

다국어 초록 (Multilingual Abstract)

Soil survey and chemical analysis on mulberry nursery garden were carried out to study the causes of the non-sprouting phenomenon occured seriously in Buyeo and Ogchun in 1983 and Sangju in 1984. In addition, 115 nursery garden soils taken from 21 sapling produsers in Chungbuk province were analyzed in 1984. The results were as follows,
1. Symptom of dead saplings was the highest in boron deficiency by 59% and the lowest in rot symptom. The rest of saplings by 34.9% were not detected any symptom.
2. The nursery gardens showen non-sprouting phenomenon were located along the stream. As the result, soil depth was shallow, around 20cm deep and subsoil composed with coarse sand and gravels.
3. Nursery soils were mostly strong acid, low in Ca and Mg content, especially B, whereas available phosphorus and potassium were abundant at some gardens, and deficient at others.
4. Application of red earth or borax to nursery garden, especially to paddy, increased sprouting rate.
5. Paddy nursery garden occupied by 52.8% of 60.8ha of total garden area in Chungbuk province. Ninty point five percent of the nursery garden was lower in pH than 6.5, 87.0% lower in K than 0.5me/100g, 40.8% lower in Ca than 6.5 me/100g, 94.8% lower in Mg tha 2.00 me/100g 99.1% lower in B than 0.3ppm.