• Journal of Bio-Environment Control
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• v.19 no.2
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• pp.97-108
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• 2010

The present study was conducted to investigate photosynthetic responses (Pn), chlorophyll fluorescence (Pe), chlorophyll contents of Allium victorialis var. platyphyllum, Ligularia fischeri, and Ligularia stenocephala growing at four different fertilizing schemes (non-fertilizing and 2.5 $g{\cdot}l^{-1}$, 5 $g{\cdot}l^{-1}$, 10 $g{\cdot}l^{-1}$ fertilizing). Three wild vegetables showed outstanding Pn and Pe at 5 $g{\cdot}l^{-1}$ fertilizing treatment. 10 $g{\cdot}l^{-1}$ of fertilizer, however, proved to be too much eventually leading to declined growth. A. victorialis var. platyphyllum showed good Pn and Pe under shade treatment whereas Pn and Pe of L. fischeri, and L. stenocephala showed the opposite tendency. The chlorophyll contents of the three wild vegetables showed the highest measurement ranging between 11.70~24.36 $mg{\cdot}g^{-1}$ when treated with 5 $g{\cdot}l^{-1}$ of fertilizer. Also it was showed that there were more chlorophyll contents under shade treatment as opposed to full sun. These results showed that 5 $g{\cdot}l^{-1}$ fertilizing treatment is optimal fertilizing of three wild vegetables and fertilizing and light intensity controlling is very important for productivity of vegetables.

• Korean Journal of Soil Science and Fertilizer
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• v.15 no.3
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• pp.178-187
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• 1982

This pot experiment was undertaken to find out the optimum fertilization ratios of total anions to total cations, ${\Sigma}A/{\Sigma}C$, and the optimum application rates of total macro-nutrients in various soil conditions. Soil samples were collected from uncultivated mountains and hills where grassland development was under consideration. 1. The optimum application ratios of ${\Sigma}A/{\Sigma}C$ and the optimum application rates of total macro-nutrients for the high yields of mixed grass-clover sward in various grassland soils were computed by the Hom$\acute{e}$s systematic variation techniqu.e. 2. With respect to the optimum application ratios of ${\Sigma}A/{\Sigma}C$ in fertilization in a mixed grass-clover sward, the grass yield and botanical composition were distinctly proportional to ${\Sigma}A$ wheras the regume yield and botanical composition were proportional to ${\Sigma}C$. 3. The optimum fertilization rates of total macro-nutrients for the high legume yields were depended upon ${\Sigma}A/{\Sigma}C$ ratios. These optimum rates were in proportional to ${\Sigma}C$ ratios and were inversely proportional to ${\Sigma}A$ ratios. 4. The efficiencies of ${\Sigma}A$ and ${\Sigma}C$ in relation to the grass and grass plus legume yields were highest with the low ratios of each other and the low fertilization rates of total macronutrients. The ${\Sigma}A$ effieiency in the legume yield tended to be similar to that of ${\Sigma}A$ related to the grass yield noted above except Daegu soil. The ${\Sigma}C$ efficiency, however, was proportional to the ${\Sigma}C$ ratio, although that was varied with the fertilization rates of total macro-nutrients and with the kinds of soils. 5. The yield of mixed forages, yield component, and botanical composition in a mixed sward were greatly influenced by the ${\Sigma}A/{\Sigma}C$ ratios, the fertilization rates of total macronutrients, and the interactions of ratio and rate noted above. In addition, these effects were generally different and opposite according to grass and legume.

• Korean Journal of Soil Science and Fertilizer
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• v.15 no.3
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• pp.194-198
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• 1982

The data from the fertilizer experiments from 1974 to 1981 were compiled and interpretation were made as to the effect of soil fertility on the quality and yield of cured tobacco supplied with conventional rate (10-15-20, 125Kg/10a). With high soil fertility, the yield of tobacco with conventional rate increased in quadratic curve, but the quality decreased. The results indicate that soil which can produce 81Kg/10a of flue-cured tobacco without fertilizer application would be optimum to the 125Kg/10a fertilizer application. On the other hand, Flue-cured tobacco yields of non-fertilizer plot are supposed to be fertility of determining the application rate which can be recommended.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.29 no.3
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• pp.218-226
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• 1984

This study was conducted to establish fundamental of cultivation system in the southern warm region of Korea by investigation of variation of yield component and yield under the different nitrogen fertilizing levels. And that levels in this experiment were 10, 15, 20 and 25 Kg/10a. Optimum fertilizing level of nitrogen was 20 kg/10a in Seokwang variety and 25 kg/ 10a in Dongjin variety. On the optimum fertilizing level (Seokwang; 20 kg/10a, Dongjin; 15 kg/10a), the correlation coefficient between No. of panicles per unit area and the rate of ripened grains were showed negative correlation (Seokwang; r =-0.6023$\^$*/, Dongjin; r=-0.858l$\^$**/). In the primary, secondary branches and spikelets, the degeneration ratio was increased significantly under the level of N=25 kg/10a in Seokwang, N$\geq$20 kg/10a in Dongjin. In Dongjin, the rate of ripened grains was decreased with increase in nitrogen fertilizing levels and that caused to decrease the yield.

• Proceedings of the Korean Society for Agricultural Machinery Conference
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• 2002.07a
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• pp.363-369
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• 2002

시비작업은 농업작업 중에서도 매우 복잡하고 까다로운 작업에 속한다. 엽색, 무성정도를 육안으로 보면서 과거의 경험, 논과 포장별 이력, 품종, 기상조건 등을 고려하여 시비시기, 시비량을 적기에 판단ㆍ결정하지 않으면 안 된다. 게다가 비료주기에서는 포장내 생육을 고려하여 위치에 따라 필요한 만큼 적정량을 살포해야 한다. 넓은 포장 안에서는 위치별로 생육차이가 있으므로 이러한 생육변이에 따라 시비량을 가감해야 하는 매우 복잡한 조작을 포함하고 있다. (중략)

• Proceedings of the Korean Society for Bio-Environment Control Conference
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• 1994.11a
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• pp.92-93
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• 1994

본 실험은 질소 시비수준에 따라 치커리의 품종간에 어떤 질적, 양적 변화를 가져오는지 알고자 하는 실험으로 치커리를 재배하는데 좀 더 향상된 품질을 만들어 보급함에 그 기초적 자료를 얻고자 실시하였다. 실험에서는 Chicory의 3가지 품종에 있어 질소시비량을 달리한 토양재배시 생육추이와 상품성을 고려하여 적정 시비량 수준을 조사하였다. (중략)

• Journal of Korean Society of Forest Science
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• v.104 no.1
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• pp.90-97
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• 2015

The objective of this study was to find optimal amount of fertilization of container seedling production for Zelkova serrata, Ulmus parvifolia, Betula costata and Tilia amurensis. To reach our goal, we measured root collar diameter (RCD), height, biomass and seedling quality index (SQI) of container seedlings of four deciduous hardwood species grown at three different fertilization treatments ($0.5g{\cdot}L^{-1}$, $1.0g{\cdot}L^{-1}$ and $2.0g{\cdot}L^{-1}$). Z. serrata seedlings grown at $2.0g{\cdot}L^{-1}$ fertilization and B. costata seedlings grown at $0.5g{\cdot}L^{-1}$ fertilization showed the highest RCD, height, biomass and SQI. The RCD and height of U. parvifolia and T. amurensis seedlings showed no significant differences by fertilization treatments. Seedlings of two species at $0.5g{\cdot}L^{-1}$ fertilization showed the lowest SQI, however, SQI at 1.0 and $2.0g{\cdot}L^{-1}$ fertilization treatments were not significantly different. Based on these results, it is appeared that container seedlings of Z. serrata at minimum $2.0g{\cdot}L^{-1}$ fertilization, U. parvifolia and T. amurensis at $1.0g{\cdot}L^{-1}$ fertilization and B. costata at maximum $0.5g{\cdot}L^{-1}$ fertilization were optimal nutrient conditions. Practice of optimal fertilization rate will make us get better quality seedlings and reduction of production costs in the container nursery system as well as good field performances with higher survival rate after planting.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.51 no.spc1
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• pp.30-34
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• 2006

The effect of N-fertilization on yield, milling characteristics and quality of Samcheonbyeo, an early maturing rice variety, was investigated in 2002 to 2004. The study was carried out in the southern alpine area of Un-bong Sub-Station, Honam Agricultural Research Institute. Higher nitrogen levels increased number of panicle and grain per unit area, but lowed ripening rate and decreased 1,000-grain weight. Higher nitrogen levels of up to 90 kg/ha also increased head rice yield. A nitrogen level of 90 kg/ha was found optimal for increasing ripening rate and head rice yield, and rice palatability.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.50 no.spc1
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• pp.46-50
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• 2005

This study was carried out to investigate the proper nitrogen fertilizer level at reclaimed saline land in the southwestern area of Korea from 2002 to 2004. The rice cultivars tested were Samcheonbyeo(Early maturing one), Nampyeongbyeo (Medium maturing one) and Hwaseongbyeo(Mid-late maturing one). The results aye summarized as follows: The more the nitrogen level, the more number of panicle and spikelet per unit area was. But, ripened grain rate and 1000-grain weight were decreased at higher nitrogen level. As higher nitrogen level, head rice rate was decreased and protein content was increased. But, amylose content wasn't differ among the nitrogen fertilizer application levels. As increase nitrogen level in head rice yield increased up to 12 kg/10a, 11 kg/10a, in Samcheonbyeo, Hwaseongbyeo and Nampyeongbyeo, respectively. But there wasn't different more than it. Consequently, considering the yield of head rice, ripened grain rate and rice quality. The proper nitrogen fertilizer application level was 11-12 kg/10a at reclaimed saline land in the southwestern area of Korea.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.36 no.1
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• pp.52-56
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• 1991

In 1986, at Cheju and Seoguipo, a sweet com hybrid, Golden Cross Bantam 70, was grown at 5 phosphate rates (0, 8, 16, 24 and 32 kg/l0a) to determine effects of phosphate rate on growth and yield of sweet com and to recommend the optimum phosphate rate for sweet com production in volcanic ash soils of Cheju province. Days to silking were shortened 1 to 2 days by phosphate application of more than l6kg/10a. Culm length, ear height and fresh stover yield/l0a did not differ between two locations, but linearly increased as phosphate rate was increased from 0 to 32kg/10a. Average length and weight of marketable ears were greater at Cheju than at Seoguipo and linearly increased as phosphate rate increased. The number of marketable ears per plant and per l0a did not differ between two locations, but quadratically increased as phosphate rate increased. The economic optimum phosphate rate estimated on the basis of the quadratic model, ranged 25.6 to 27.4kg/10a at various fertilizer-to-ear price ratios.