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李梡周,鄭光永,金永澤 한국잠사학회 1985 한국잠사곤충학회지 Vol.27 No.1
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.
李梡周,崔營哲,金三銀,李相夢,李永漢 한국잠사학회 1993 한국잠사곤충학회지 Vol.35 No.1
Field experiment and silkworm rearing were conducted for 4 years in an attempt to reduce phosphorus fertilizer in mulberry field with high levels of phosphate. Experiments consisted of four treatments; normal recommended P application (13 kg P2O5/10a), half, null and no fertilizer on each of 3 mulberry fields, two fields with 300 ppm and one field begining with 450 ppm of aviable P2O5 content in soil. One of 300 ppm fields was used for leaf quantity and one for leaf quality test by silkworm rearing. Leaf yield in the 300 ppm field decreased after the 3rd spring in the no phosphorus treatment and in the 4th fall in the half phosphorus treatment. No yield decrease occurred in 450 ppm field for 4 years. Yield decrease did occur in the next rearing season after soil phosphate content in the 10~20 cm zone dropped below 150 ppm. Phosphorus fertilizer should be applied at this time. Though P2O5 concentration in leaves of no phosphorus treatment was 0.18% lower than that of conventional treatment there were no difference in cocoon quality.
尿素 葉面施肥후 經過日數가 뽕잎 化學性分과 누에에 미치는 影響
李梡周,金三銀,韓修貞,尹聖重 한국잠사학회 1993 한국잠사곤충학회지 Vol.35 No.2
The effect of short term duration(1, 2 and 3 days) after urea foliar spray on leaf quality was investigated by chemical analysis of leaves and silkworm rearing with leaves treated with urea in autumn. Foliar spray increased water content by 0.4~O.7% and total nitrogen by 0.19~0.51% in leaves compared to the conventional treatment. Foliar spray increased NO3-N concentration in leaf 503 ~ 1107 ppm more than the conventional treatment NO3-N concentration in leaf decreased with days after foliar spray. Whole cocoon weight and cocoon shell weight increased by 0.02~0.14 g and 0.5~3.1 cg, respectively in foliar spray than in the conventional treatment. Though foliar spray raised NO3-N concentration in leaf, leaves harvested one day after foliar spray were no harmful to silkworms.
夏秋期 異常 低溫下에서 뽕나무 發育不振要因과 追肥에 의한 生育增進
李梡周,尹明根,具泰浣,尹聖重,金光泳 한국잠사학회 1994 한국잠사곤충학회지 Vol.36 No.2
Abnormally cool and wet weather conditions during the summer of 1993 offered an opportunity to evaluate the effects of abnormal weather conditions on mulberry growth and to develop cultivation practicies to reduce leaf yield loss under the similar abnormal weather conditions. Different methods of nutrient supplementation were evaluated in Su-won and Kongju. Nitrogen was supplemented by foliar spray of urea (0.7%) or composite chemical fertilizer Jamsibiryo #8, or by the application of ammonium sulfate (60 kg/ha) to the soil. During the period between the late June and the early September which corresponds to the mulberry growing season after summer pruning, mean temperature was 1.4°C lower and precipitation 83mm higher than normal year. This weather condition in 1993 caused reduction in leaf yield by 16.4% than common year. Soil nitrogen content decreased due to higher precipitation. Leaf yield loss was reduced by the supplementation of nitrogen to the soil. Leaf nitrogen content increased with the foliar urea spray and nitrogen supplementation to the soil.
李梡周,崔營哲,金振吉,李種漢,金光泳,林炳和,金漢俊 한국잠사학회 1991 한국잠사곤충학회지 Vol.33 No.1
The study was carried out to investigate the effect of ethrel (2-chloroethylphosophonic acid, 39%) on the graftages quality. Ethrel was sprayed 5 days interval from October 10 to October 30 at 6 places (Suwon (I), (II), Chungju, Kongju, Wanju, Jangsong). Spraying conentration was 1,000 ppm (400 times dilution). 1. Spray took 3.3 hrs and 500 m of ethrel on 10a eara. 2. The passed rate of graftages decreased 5~8% on the treatments earlier spray than on Octorber 20. 3. New shoot length and number of shoot of the ethrel treatments were the same as the natural leaf falling.
李梡周,李建榮 한국잠사학회 1984 한국잠사곤충학회지 Vol.26 No.1
The survey and soil analysis were carried to research the problems on mulberry fields applied glutamic acid fermentation residue fertilizer (GAFRF). Mulberry farmers of 364 from 110 Si or Gun were chosen at random. The results were as follows; 1. Application rate of three elements applied on mulberry field was 25.8-12.8-16 in non·GAFRF using farmers, whereas 9.8-4.5-5.5kg/10a in GAFRF using farmers. 2. Application rate of organic matter applied on mulberry was 1155kg in non-GAFRF using farmers, whereas 329kg/10a in GAPRF using farmers. 3. Farmers of 53% using GAFRF did not applied three elements, 74% of them organic matter and 50% of them both of three elements and organic matter. These figures increased proportionally with application period of GAFRF. 4. The content of organic matter, availeble P2O5, K, Ca, Mg and pH in soil of appling GAFRF farmers was somewhat lower than in soil of non-appling GAFRF farmers.
李梡周,權寧河,金光泳,崔營哲,朴光駿 한국잠사학회 1990 한국잠사곤충학회지 Vol.32 No.2
A mulberry field and 3 graftage nurseries in Puyo were flooded for 2 to 5 days in 1987 to ivestigate flood damage. The effect of fertilization upon fall yield in previously flood fields was also studied. The results were: 1. Graftages which received 2 days of flood were alive with decaying leaves submerged under water. Graftages submerged completely for 5 days died, whereas those whose top appeared above the water lived. Graftages which were knocked down by water and scratched by sand, following washing by a fire engine, died. 2. Mulberry trees flooded for 5 days were alive when tops were above the water. 3. Mud soil carried by the flood and deposited on the mulberry had a pH of 6.43, organic matter 2.4%, and available phosphorus of 124ppm. The original sandy soil of the mulberry fold had a pH of 5.52, organic matter 0.3%, and available phosphorus of 467ppm. Mud, as a clayey soil with high fertility, may play a role in soil building. 4. Mulberry from ttle flooded field showed 3.4% higher yield with additional fertilization than no fertilization. This suggests nitrogen a mobile element, was lost in the flood.
뽕나무 接木苗에 관한 연구 : Ⅶ.接木 후 톱밥저장에 의한 早期接木 Ⅶ.Earlier Grafting with Preservation of Grafts in Sawdust
李梡周,崔營哲,李永漢 한국잠사학회 1993 한국잠사곤충학회지 Vol.35 No.1
Mulberry grafting season is normally a one month period starting at the end of March. Such a short period creates a shortage of qualified grafters and inflates wages. Pine tree sawdust was tested as a medium in which to preserve graftages. Sawdust was moistened to two ratios of water to dry weight of sawdust (1.5 and 2.0). Scions were either grafted the same day they were colleted or first incubated for 10 days at 15°C. Grafting period could be extended to the middle of February under 1.5 times moisture content and fresh scions. Preservation of scions increased water content T-N. P2O5. CaO and inositol. whereas decreased total C, glucose and fructose. With no preservation total C decreased, inositol increased slightly early March followed sharp decrease, and sucrose increased with time.
뽕나무 接木苗에 關한 硏究 : Ⅲ.추기 굴취적기에 관하여 Ⅲ.Optimum Season for Mulberry Graftage Harvesting in Autumn
李梡周,崔營哲,金光泳,金洛相,金振吉,金漢俊,柳甲道,李種漢,林炳和,金基錫 한국잠사학회 1989 한국잠사곤충학회지 Vol.31 No.1
Experiments were conducted to investigate the optimum season for mulberry graftages harvesting before the period of natural leaf fall in autumn. Harvesting season was examined at 10 days intervals from September 30 to November 20, 1985 and 1986, at nine sites in eight provinces. The results were: 1. Diameter of graftages increased until October 30. 2. Early harvest of graftages decreased survived rate, number of shoots, and total shoot length the next spring. The October 30 harvest yielded the best growth the following spring. 3. Harvests after October 20 allowed for good survial of mulberry shoots and sprouting the following spring. 4. Total N and P in plants increased with late harvests, K decreased, and Ca content was not affected by harvest date. 5. Total N, P, and Ca were higher in stem cortex than root bark, while K appeared to be equally distributed between root and shoot bark.
뽕나무 接木苗에 關한 硏究 : Ⅱ.活着不良苗의 發生 原因에 關한 硏究 Ⅱ.Several Factors Affected to the Non-sprouting Sapling
李梡周,權寧河,朴光駿,金永澤 한국잠사학회 1985 한국잠사곤충학회지 Vol.27 No.2
To study the non-sprouting causes of mulberry saplings, 8 treatments, borax lime compost, borax, lime, Jamsi fertilizer No. 1, heavy nitrogen application, blanch harvest, heavy harvest and no treatment were applied on the nursery garden. The tract used as the paddy field before sapling produced was very poor in the soil chemical and physical properties. The results were as follows; 1. The survial rates of saplings were higher than 98% in the treatments of borax, lime, Jamsi fertilifer No. 1, whereas heavy nitrogen 59% and heavy harvest 71%. 2. The survial rate was showed deeper relationship with the chemical concentration in stem cortex than in root cortex, especially the content of B, Cu and Zn. 3. The nitrogen content in stem cortex was much higher in the heavy nitrogen treatment by 0.89%, where as 0.6∼().7% in the other treatments. However, treatments of the heavy harvest and the branch harvest were around 5%. 4. In order to decrease the non-sprouting sapling rate, nursery garden should be good in soil chemical and physical properties. Harvest from saplings and heavy nitrogen application should be prevented and lime or Jamsi fertilizer should be applied to saplings.