• Journal of Plant Biology
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• v.19 no.2
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• pp.37-40
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• 1976

The experiment designed to obtain information relative to the favourable levels to apply N.P.K fertilizer was conducted at the hop garden of College of Agriculture, S.N.U. in 1975. The varieties used were 1-year-old Cascade, Hallertau and Shinshuwase. The design of the experiment was a split plot design with 3 replications. Yields were recorded as fresh weight of harvested cones in gram per split plot. The results obtained from the experiment were as follows: 1. The results from analysis of the data for 3 varieties indicated that significant increase in yield were found due to the application of 46g N, 20g P2O5 and 60kg K2O per plant, although higher level thn the above caused a remarkable reduction of yield. 2. The individual fresh weight of harvested cones was significantly increased with application of nitrogen, phosphorus and potash, regardless of fertilizer levels. 3. Analysis of variance for yields showed that there were no significant interaction between fertilizer level and variety, i.e., all varieties used might require the same fertilizer level.

• Korean Journal of Soil Science and Fertilizer
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• v.14 no.4
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• pp.210-214
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• 1982

A field experiment to compare the effects of different granular sizes of fused magnesium phosphate (FMP) on the growth and yield of barley plants was conducted on a loam soil during the 1978/1979 cropping period. The results were summarized as follows: 1. No significant differences in yield were observed between the application of comercial FMP, mixture of large and small granules, and small granular FMP; however, the smaller FMP application increased the yield of barley by 5 percent than the larger FMP application. 2. The fresh root weight and the total dry matter were greater in the smaller granular FMP, and the yield showed a linear relationship with the fresh root weight.

• Horticultural Science & Technology
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• v.28 no.4
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• pp.580-584
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• 2010

The effect of planting densities on the growth of $Sedum$ $samentosum$ (4 collections) was investigated using nutrient film technique (NFT) with Yamazaki' lettuce nutrient solution (1982) from September 5th to October 24th in non-heating plastic film house. At 40 days, the plant height of 4 collections showed the range of 15.0-18.9 cm, and mean plant height was high the order of $10{\times}10$, $2.5{\times}2.5$, and $5{\times}5cm$. The growth of 'Pohang' and 'Wando' collections was better compared to that of 'Gunsan' and 'Wanju' collections. Number of node, stem diameter, and fresh and dry weight per plant were decreased in higher planting density. Despite the lower fresh weight per plant obtained, the fresh yield per $m^2$ was significantly increased in higher planting density. The mean fresh yield was $14.9kg{\cdot}m^{-2}$ in $2.5{\times}2.5cm$, and 'Pohang' collection showed the highest fresh yield ($17.6kg{\cdot}m^{-2}$). The first optimized harvesting time base on plant height was 30-40 days after NFT culture during autumn season. In eating quality, compression force of stem and bitterness of shoot were decreased in higher planting density. However, the heavy labor demanding high density cutting needs to be improved for hydroponic culture of $S.$ $samentosum$.

• Proceedings of the Korean Society of Crop Science Conference
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• 1988.07a
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• pp.50-51
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• 1988

• 한국신재생에너지학회:학술대회논문집
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• 2010.06a
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• pp.197.1-197.1
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• 2010

This study was carried out to evaluate the operating performances of the evaporation desalination system with solar energy. This system was designed to use evacuated solar collector as the heat source, supplying the required heat energy and photovoltaic power as the electric source, supplying required power to pumps in the desalination system. The 5kW photovoltaic power generation system to make the electricity, the single-stage fresh water generator with plate heat exchanger, and remote control and monitoring system. Solar desalination system was designed and installed in Jeju-island, Korea in 2006, after about 4 years of operation, usability and stability of solar desalination system was guaranteed. The system comprises of the desalination unit which was designed to have daily fresh water capacity of $2m^3$, a $120m^2$ evacuated tubular solar collector to supply the heat, a $6m^3$ heat storage tank, and a 5.2kW photovoltaic power generation to supply the electricity to hydraulic pumps for the heat medium fluids. On a clear day, average daily solar irradiance in Jeju-island was measured to be $500W/m^2$ and the daily fresh water yield showed to be more than 500 liters under this condition. After around three years of a long term operation of the system from January 2007 to August 2009, average daily freshwater yield was analyzed to be around $330{\ell}$. The relationship equation between solar irradiance and freshwater yield was found to be y=1.1806x - 107.89.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.26 no.1
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• pp.115-120
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• 1981

Effect of soil water on the growth of Panax ginseng(2 years old) was investigated through pot experiment. the results were as follows. 1. Optimum soil moisture content for root yield appeared to be 65.5% of field capacity(22.1% fresh weight basis) and at 31.5%(10.7% fresh weight basis) relative growth rate was nil. 2. Under suboptimum condition of soil moisture, emergence of shoot and leaf unfolding was delayed. The rate of emergence of shoot and leaf area was also decreased while missing shoot rate was increased. 3. Root yield was positively correlated with leaf area per plant(r=0.91 **), stem diameter (r=0.73**), stem length(r=0.71 **) fresh top yield(r=0.93**) and negatively with missing shoot rate(r=-0.77**). 4. Fresh root weight showed negative correlation(r=-0.80**) with water content of root indicating that tissue is more compact when grown at sufficient water.

• Korean Journal of Plant Resources
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• v.17 no.2
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• pp.183-188
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• 2004

This study was conducted to investigate the effects on the growth and yield by the different seeding methods and cultivating root weight in Atractylodes macrocephata Koidz. Seeding distances were different such as 5${\times}$5 cm, 5${\times}$10 cm, 10${\times}$10 cm, 10${\times}$15 cm by the hand seeder and 15 cm seeding in drill. Emergence date, plant height were not significantly changed with seeding space, but the number of leaf, fresh weight of above-ground part and fresh weight of root were increased in the sparse seeding compared with the dense seeding. The highest fresh root yield was 1,012 kg/10 a at the 5${\times}$5 cm. Roots yield was increased in the sparse seeding compared with the dense seeding, but the highest number of roots above 16 g yield was observed at the 10${\times}$10 cm seeding distance. Emergence date was faster 1∼3 day root weight above 6 g than that root weight 5 g. The plant height, number of stem and fresh weight of above-ground part were more increased as the root weight was heavier. The growth of underground part were more increased as the root weight was heavier, yield was increased about 27％ to 112％ compared with root weight above 6 g than that 134.6 kg/10 a with root 5 g.

• International Journal of Industrial Entomology and Biomaterials
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• v.4 no.2
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• pp.143-147
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• 2002

Studies on the interrelationship between biological yield and harvest index, and their association with shoot rearing were carried out in 9 promising mulberry genotypes, which indicated significant variations among genotypes. Biological yield had close association with leaf yield components indicating that they are inter-related for higher productivity in mulberry, Biological yield revealed highly significant positive correlation with important leaf yield components. However height of the longest branch showed negative correlation with biological yield. Genotypes with higher biological yield associated with low ratio of stem weight to leaf weight and high Harvest index on dry weight basis are to be selected for shoot rearing. Biological yield recorded on fresh weight basis had less impact on the present study in comparison to dry weight basis.

• Korean Journal of Plant Resources
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• v.20 no.4
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• pp.309-311
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• 2007

This study was conducted to select the most suitable fertilizer level on nursery of mat rush for good quality and high yield. $N-P_{2}O_{5}-K_{2}O=60-30-60$ (kg/10a), fertilizer level on nursery of mat rush showed relatively superior values for all yield components and quality with 57g in fresh weight, 12g in dry weight, 23% in air drying ratio for per plant at the nursery and 125cm in stem length, 150 numbers in stem number, 4,082kg/10a in fresh stem yield, 345kg/10a in long stem yield, 996kg/10a in medium stem yield, 1,421kg/l0a in total stem yield, 34% in dry stem ratio and 30% in long stem ratio at the main paddy field. The results indicate that fertilizer level, $N-P_{2}O_{5}-K_{2}O=60-30-60kg/10a$ in nursery shows different adaptabilities to a particular fertilizer level and 60-30-60 (kg/10a) seems to be the most suitable fertilizer level of mat rush for good quality and high yield.

• Proceedings of the Korea Technical Association of the Pulp and Paper Industry Conference
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• 2006.06b
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• pp.295-303
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• 2006

The pulp yield was improved by about 4.5-5% when polysulfide (PS) and anthraquinone (AQ) were added to the kraft cooking liquor (white liquor). The exchange of the black liquor with fresh white liquor further increased the yield. The highest pulp yield was obtained when the PS cooking liquor containing 70% of total active alkali (AA) and 100% of AQ was used from the beginning of the reaction and the black liquor was exchanged with fresh white liquor containing the residual 30% of AA just after temperature reached $135^{\circ}C$. There was a good correlation between kraft pulp yields of a hardwood species and the ratios of the amount of xylose to glucose (X/G ratio), liberated by an acid hydrolysis of the pulps. However, the correlation was dependent on raw material wood species. Therefore, it is required in advance to establish a correlation between the yields and X/G ratios for raw material wood species of a target pulp in order to estimate pulp yield using X/G ratio. The X/G ratios of relatively high yield pulps showed higher values than those expected from the correlation. In a mill trial, the superiority of the PS-AQ isothermal cooking (ITC) process over the kraft ITC process was confirmed by examining X/G ratio of pulps obtained. The pulp yield in the PS-AQ ITC process was estimated at about 57.0%. This yield is very high, which indicates that reaction conditions of the PS-AQ ITC process are optimal.