• KOREAN JOURNAL OF CROP SCIENCE
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• v.32 no.2
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• pp.188-195
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• 1987

This study was conducted to investigate whether seedling growth be affected by immature kernels from different stages after flowering in rye, triticale, wheat and oats cultivars, for two years in Suwon. Kernels reached a near-maximum test weight at 35 days after flowering in Paldanghomil and Dooroohomil (Rye), and 30 days in Sinkihomil (Triticale), Geurumil (Wheat), and Megwiri (Oats). Test weight of immature kernels from different days after flowering were not significantly correlated with germination percentage, but highly positively correlated with their seedling height, fresh and dry weight. However, seedling height is not different among seedlings from kernels harvested at 20, 25 and 30 days (maturing time) after flowering of Sinkihomil and Megwiri, and between 25 and 30 days (maturing time) of Geurumil. Also between seedlings from 25 day and 30 day-kernel after flowering are little difference of fresh and dry weight of Sinkihomil and Megwiri. In Suwon, located at the middle part of Korea, it was suggested that Paldanghomi1 and Dooroohomil could be harvested at 35 days (June 19, and June 24, respectively) after flowering, and Sinkihomil, Geurumil, and Megwiri, at 25days (June 24, June 14 and July 4, respectively) after flowering for seed of for2:ge production.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.53 no.2
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• pp.137-143
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• 2008

Rapid canopy closure (RCC) is one of the physiological attributes that may enhance genetic yield potential of rice (Oryza sativa L.) in a growing season. Crop growth before canopy closure could be described by an exponential equation of $y\;=\;{\alpha}{\cdot}{\exp}({\beta}{\cdot}t)$ where $\alpha$ is the crop leaf area index (LAI) or shoot dry weight (DW), t is the thermal time, $\beta$ is the LAI or DW at the beginning of the exponential growth and is the relative growth rate of LAI ($m^2m^{-2}^{\circ}C^{-1}$) or DW($gg^{-2}^{\circ}C^{-1}$). Field experiment using 22 cultivars revealed that the exponential growth phase before canopy closure can be divided into two sections; an earlier section during which crop dry weight and LAI of varieties are highly dependent on $\alpha$ and a second section where crop dry weight and LAI are highly dependent on $\beta$. Grain weight had significantly positive correlation with $\alpha$ parameter and dry weight and LAI during early exponential phase. The parameter $\beta$ of the exponential growth curve had positive and significant correlation with the LAI and dry weight during the late exponential growth phase, grain number per unit area, and grain yield. There was genotypic difference for RCC parameters, $\alpha$ and $\beta$, indicating the possibility of genetic improvement for these traits.

• Current Research on Agriculture and Life Sciences
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• v.5
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• pp.12-18
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• 1987

This study was performed to investigate the creeping habit in top-cross progeny, and to determine the relationship among the major agronomic characters in the top-cross progeny testing based on the The The conclusions of simple correlation coefficients. the study were summarized as follows ; The creeping type crossed with the non-creeping tester was the greatest in width and seed yield. For all three characters, the creeping type crossed with the non-creeping tester and the non-creeping type crossed with the creeping tester were greater than any other combination. The top-cross method was desirable for the study of general and specific combining ability. The sensitivity of the tester to differentiate the creeping and non-creeping types was better when a non-creeping tester was used.

• Korean Journal of Breeding Science
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• v.40 no.3
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• pp.340-343
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• 2008

A new pale yellow gerbera(Gerbera hybrida Hort.) cultivar 'Honey Cream' was developed from a cross between 'Princessa' and 'Picasso', followed by seedling and line selections at the Flower Research Institute, Gyeongnam Agricultural Research and Extension Services(ARES) in 2006. Three times evaluations were conducted from 2003 for the detailed characteristics of the new cultivar. 'Honey Cream' has semi-double type large flowers in good harmony with pale yellow(RHS, 11-D) ray floret and green center. It has good, stable flower shape and strong peduncle, and its vase life was 12.3 days. The average flower yield of 'Honey Cream' was about 48.5 stems per plant/year in greenhouse trails during 2003 and 2006. This cultivar was registered to the Korea Seed and Variety Service(KSVS) for commercialization in 2007. Year-round production of this cultivar is possible in the greenhouse condition in Korean climate.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.39 no.2
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• pp.115-120
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• 1994

To find out the effects of preharvest sprouted degrees of barley on yield, grain quality and germination rate, various sprouted grains were planted. The grains sprouted upto 2 mm and 4mm of root lengths showed regerminating rates of 68% and 49% respectively, and those above 4mm of root length decreased seriously in regerminating rate. First of all, the PI (promptness index) of sprouted barley compared with that of intact barley decreased conspicuously even in 2mm of root length. Grain yield decreased inversely with the growth of root lengths of sprouted grains. The times required to polish the naked barley up to polishing yield of 72% and husked one upto that of 64% were shortened inversely with the root lengths of sprouted grains. The rate of split kernel against sound one after polishing increased greatly by 17.6% to 36% in sprouted barley compared to 2% to 3.5% of the control which presoaked in water for 2 hours. Whiteness indexes of polished kernels of the sprouted barley and the control were higher than that of intact one. The index, however, was lowered inversely with root lengths in sprouted barley.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.41 no.1
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• pp.28-33
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• 1996

This experiment was carried out at National Crop Experiment Station in 1994 to obtain basic information of growth characters and yield of rice under various seeding methods in direct seeding on dry paddy. Hwaseongbyeo sown on April 27 by flat drill seeding, high ridged drill seeding and hill seeding under different seed conditions, soil convering after seeding and irrigation methods. Nitrogen applied 150kg /ha by 3 times split application at rate of 40:30:30％ (basal: 5th leaf stage:panicle initiation stage). Seedling stands were higher in flushed irrigation water after seeding than in irrigation at 3rd leaf stage, and it also was higher in high ridged drill seedings than in flat drill seedings. Days for seedling stand, heading date were shorten 6~10 days, 2~3 days by flushed irrigation water after seeding, respectively. Number of tiller was more in high ridged drill seedings than conventional seedling method(Flat drill seeding ＋ intact seed ＋ soil covering after seeding ＋ irrigation at 3rd leaf stage after seedling stand) at early growth stage, but the most tiller number was highest in developed seeding method(Flat drill seeding ＋ soaked seed ＋ non soil covering after seeding ＋ fulshed irrigation water after seeding) at heading stage among used seeding methods. Lodging index was slightly high in high ridged drill seeding and conventional seeding. Field lodging was degree 1 in high ridged drill seedings and developed seeding, Milled rice yield in developed seeding was increased 7％ compaired with conventional seeding(5.35t /ha).

• Journal of Practical Agriculture & Fisheries Research
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• v.20 no.1
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• pp.5-18
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• 2018

The field trial was performed to evaluate the rice growth and yield in direct seeding cultivation with iron-coated rice seeds. The required time for seed emergence was for 9~11days in the tested direct seeding methods. That was 1~2days earlier in direct seeding with pregerminated seeds than that of direct seeding with iron-coated seeds. The seedling establishment was highest in water seeding with iron-coated seeds but there was not significant difference in terms of statistical analysis. The rice plant height was taller in water seeding with broadcasting method than that of wet hill-seeding methods and in direct seeding with iron-coated seeds than that of direct seeding with pregerminated seeds. The tiller number in the rice plant was the highest in machine transplanting at 30days after direct seeding(June 17) and in water seeding with iron-coated seeds at 45days after seeding(DAS) and 60DAS. The tiller number of 75 and 90DAS in the tested rice cultivation methods being with 352~405/m² was not significantly different in terms of statistical analysis. The heading time was not different in rice direct seeding methods but 2 day earlier in direct seeding with iron-coated seeds than that of direct seeding with pregerminated seeds. The culm length was the highest in water seeding with iron-coated seeds and the panicle length was the longest in wet hill-seeding with pregerminated seeds. The panicle number per m² was highest in water seeding with iron-coated seeds but not significant difference among the tested rice cultivation methods. The water seeding with iron-coated seeds resulted in the highest spikelet number per m² and the heaviest grain weight of brown rice. Percentage of ripened kernel was the highest in wet hill-seeding with iron-coated seeds. But there were not significant among the tested rice cultivation methods. The milled rice yield in direct seeding methods was 3~21% higher than that in machine transplanting. Water seeding with iron-coated seeds recorded the highest milled rice yield being with 6.86t/ha.The occurrence of sheath blight was high according to machine transplanting>wet hill-seeding>water seeding. Weed occurrence was the highest in water seeding with pregerminated seeds. Weedy rice occurred not in machine transplanting but occured 0.6~0.7% in direct seeding methods with pregerminated seeds and 0.1% in direct seeding with iron-coated seeds.

• Journal of The Korean Society of Grassland and Forage Science
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• v.30 no.3
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• pp.247-256
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• 2010

This experiment was carried out to investigate the effect of seeding rate of newly developed Italian ryegrass varieties, "Kogreen" and "Hwasan 101", on those seed production in Cheonan for three years (2005 to 2007). Two Italian ryegrass varieties were seeded at experimental fields of Grassland and Forage Division, National Institute of Animal Science on late September, and harvested at seed shattering stage. The experiment was arranged in randomized complete block design with three replications by each variety. The treatments was consisted of five seeding rates (5, 10, 20, 30, 40 kg/ha). The average heading date of "Kogreen" was 9 May and "Hwasan 101" was 25 May. The harvesting date of "Kogreen" was on 16 June when the rainy season should not set in. In the case of "Hwasan 101", the harvesting date of seed production was 3 July, because of rainy season. The number of ear per square meter, ear length, spikelet number, seed yield per ha and ripening rate of "Hwasan 101" were 471, 28.5 cm, 24.8, 1,631 kg and 71%, respectively. and those of "Kogreen" were 633, 24.0 cm, 20.8, 2,676 kg and 82.1%, respectively. The shattering property rate of "Hwasan 101" 40.3% was higher than that of "Kogreen" 2.6%. The germination rate of harvested "Hwasan 101" seed was 81.8% and that of "Kogreen" was 79.4%, respectively. In conclusion, the optimum seeding rate of Italian ryegrass for seed production are recommended 20kg/ha in both "Hwasan 101" and "Kogreen".

• Journal of The Korean Society of Grassland and Forage Science
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• v.35 no.2
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• pp.119-124
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• 2015

In this study, we sought to evaluate the growth characteristics and seed productivities of domestic tall fescue that were cultivated with differing combinations of drill widths and nitrogen-application rates in early spring; the examination was conducted at the National Institute of Animal Science, RDA, from 2013 to 2014. The main plots were three widths of 15 cm, 30 cm, and 45 cm, and the subplots were subject to nitrogen-application rates in early spring of 45 kg/ha, 90 kg/ha, 135 kg/ha, and 180 kg/ha. The growth and development characteristics did not vary by treatment in terms of drill width and early-spring nitrogen application. Tall fescue Purumi showed a stable seed productivity of two tons or greater when the drill width was set at 15 cm and 90 kg/ha of nitrogen was applied in early spring. The narrower the drill width, the greater the numbers of both the ears and seeds, while the length of the ear was longer when the drill width was wider. Regarding the influence of the drill width and early-spring nitrogen application on the productivity of seed-producing straw, the dry matter productivity was higher when the drill width was narrower; however, no particular trend was observed with respect to different amounts of fertilizer. The average production amount of the first round of straw after seed gathering was 6,920 kg/ha. The second round produced an average 8,134 kg/ha of dry matter.

• Proceedings of the Korean Society of Crop Science Conference
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• 2000.04a
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• pp.188-189
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• 2000