• 한국초지조사료학회지
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• 제41권2호
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• pp.84-95
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• 2021

The purpose of this study was to assess the forage productivity and nutritive value of kenaf at different fertilizer application amounts and various stages of maturity. The experiment was conducted from May to September 2020, the amount of 80 kg of kenaf seed/ha was supplied with different types and amounts of nitrogen fertilizer and the plants were harvested at 10-day intervals from different harvesting dates (24^th August and 3^rd, 13^th, 23^rd September). According to the different fertilizer types and application amounts, the highest kenaf height was recorded in the inorganic fertilizer amounts of 200 and 250 kg N/ha and the fresh and DM yield were significantly improved in the inorganic nitrogen amount of 250 kg N/ha. The highest CP and TDN content in the leaf was achieved in the inorganic fertilizer amounts of 150 and 200 kg N/ha, respectively; and the highest TDN content in the stem was also found in the inorganic fertilizer amount of 200 kg N/ha. According to the different harvesting dates, the highest DM ratio was found in the harvesting date of 13th September, the leaf ratio increased with advanced maturity, whereas the stem ratio decreased significantly and the highest DM yield of kenaf was recorded in the harvesting dates of 13^th and 23^rd September. Besides, the highest CP, CF, CA, ADF, NDF and TDN content in the leaf as influenced by different harvesting dates was 15.4, 31.8, 10.2, 22.1, 34.7 and 76.5%, respectively, and the CP, CA, ADF and TDN in stem decreased significantly with advanced maturity of kenaf. In conclusion, the optimal fertilizer amounts and the appropriate harvesting dates for a high forage yield and high-quality kenaf as livestock feed were the inorganic fertilizer application amounts of 200-250 kg N/ha and from 13^th and 23^rd September, respectively.

• 한국초지조사료학회지
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• 제15권1호
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• pp.37-42
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• 1995

This experiment was canied out to study the effects of seeding and harvesting dates on the growth of early and late maturing rye(Seca1e cereale L.) varieties at the forage testing field of S.N.U., Suweon, from September 1986 to May 1989. Leaf and tiller numbers of rye per plant were increased with earlier seeding date, but no difference in the tiller numbers was found between harvesting dates of early and late maturing rye varieties. Tiller dry weight of an early maturing rye veriety, Wintermore was higher than that of a late maturing rye variety, Kodiak when sown as early as September. Maximun leaf area index(LA1) and leaf area index duration(LA1D) were achieved with earlier seeding and early maturing rye varieties. A higher correlation between the maximum LA1 or LAID and dry matter accumulation of rye varieties was observed in this experiment.

• 한국초지조사료학회지
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• 제14권4호
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• pp.316-323
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• 1994

In order to reduce the problems from the presence of rye crop residues in maize establishment and yield, and also to improve the growth, productivity and nutritive value of rye(Seca1e cereal L.). an experiment was canied out to determine the variety effect of rye on the forage production system and the eft'ect of seeding and harvesting dates on the production and quality of rye. 'This experiment was conducted at the forage testing field of S.N.U., Suweon, from September 1986 to May 1989. Heading date of an early maturing rye variety, Wintermore. was earlier 10 days than that of a late maturing rye variety, Kodiak. A 15-days delay in the seeding dates of early and late maturing varieties of rye tended to delay the heading dates of the rye varieties for 3 and 4 days, respectively. Dry matter and in vitro digestible dry matter yields were markedly increased with earlier seeding date. Before 20 April, the DM and IVDDM yeilds of an early maturing rye variety, Winterrnore. were higher than those of a late maturing rye variety, Kodiak. However, no such a trend was found between the early and late maturing varieties of rye after 27 April. Less than 35% of ADF was recorded until the harvesting dates of 13 and 27 p r i l for early and late maturing rye varieties, respectively, but less than 46% of NDF was maintained until the harvesting drtte of 13 April for botg varieties. Based on the results obtained from this experiment. it may be concluded that the most desirable forage production from corn-rye double cropping system is to advance the seeding time of rye toward the first 10 days of September as well as harvesting time toward the first heading stage with an early maturing rye variety.

• 한국초지조사료학회지
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• 제24권2호
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• pp.115-122
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• 2004

본 시험은 옥수수 파종시기 5월 10일, 5월 20일 및 5월 30일을 주구로 옥수수 수확시기 9월 15일, 9월 25일 및 10월 5일을 세 구로 하여 분할구 배치법 3반복으로 2년간 축산연구소 한우시험장에서 수행하였다. 옥수수의 간장은 파종기가 5월 30일, 5월 10일 및 5월 20일순으로 작아졌으며, 수확기는 각 파종기 공히 10월 5일이 큰 경향이었다. 옥수수의 착수고는 파종기가 5월 20일, 5월 30일, 5월 10일순으로 작았고 파종기는 5월 10일, 5월 20일, 5월 30일순으로 낮아졌다. 파종기에 따른 옥수수 암이삭 비율은 파종기 5월 10일이 가장 높았다. 옥수수의 건물수량은 파종기가 늦추어짐에 따라 적어졌으며, 수확시기가 늦추어짐에 따라 높아졌다. 파종시기에 따른 옥수수 경엽의 조단백질 함량은 5월 10일보다는 5월 20일과 30일이 높았고 이삭은 5월 20일이 5월 10일이나 30일보다 높았다. 수확시기에 따른 경엽의 조단백질 함량은 파종시기에 관계없이 9월 15일이 가장 높았고 9월 25일과 10월 5일순으로 낮았으며, 이삭의 경우도 경엽과 비슷한 경향을 보였다. 경엽의 NDF와 ADF 함량은 수확시기가 지연됨에 따라 높은 경향을 보였다. 이상의 결과를 종합하여 볼 때 건물수량과 사료가치를 고려하면 파종시기는 가능하면 빨리 파종하는 것이 유리하나 고랭지에서는 너무 일찍 파종하면 늦추위에 냉해의 위험이 있기 때문에 5월 20일경에 파종하는 것이 안전하고, 수화시기는 너무 늦게 수확하는 것은 건물수량은 높아지나 사료가치가 감소되므로 대관령과 같은 고랭지에서는 만상일이 9월 28일인 점을 감안하면 9월 25일 이전에 수확하는 것이 적당할 것으로 생각된다.

• 한국초지조사료학회지
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• 제40권1호
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• pp.66-72
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• 2020

본 연구는 사일리지용 옥수수(whole crop maize: WCM)의 메타자료를 통해 적정 파종 및 수확시기에 대한 탐색을 생육도일(Growing degree days, ℃; GDD)을 이용하여 검토하였다. WCM의 원자료(1982~2012년)는 학위논문, 학회지 및 연구보고서로부터 실험별 연도, 품종, 지역, 파종시기 및 수확시기 등 생육정보가 포함된 3,152점이었다. 수집한 자료 중 파종시기 및 수확시기와 관련된 자료는 데이터입력, 자료선별 및 오류자료수정 과정을 거쳐 최종데이터세트(파종시기 29점, 수확시기 92점; 총 121점)를 구성하였고 최적점 설정, 메타분석, 2차모형 구축을 통하여 적정 파종 및 수확시기의 허용 범위를 고려한 기간과 GDD를 제시하였다. WCM의 적정 파종 및 수확기간은 각각 4월 14일~5월 3일 및 8월 15일~9월 4일이었으며 이 때 GDD는 23.7~99.6℃ 및 1,328.7~1,602.1℃였다. 이상에서 GDD는 WCM의 적정 파종 및 수확시기의 판단기준으로 사용 가능할 것으로 사료된다

• 한국작물학회지
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• 제45권1호
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• pp.55-58
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• 2000

Germination of sweet and super sweet corn is lower than normal corn due to the higher sugar and lower starch contents of kernels. Sweet corn seeds are easily deteriorated in the field under the unfavorable condition, therefore it is important to identify the optimal harvesting time for seed production. This trial was conducted to investigate the responses of germination percentage of shrunken-2(sh2), brittle(bt), sugary(su), and sugary enhancer(se) hybrids in relation to harvesting dates. Eight hybrids of four different gene sweet corns were harvested at 15, 20, 25, 30, 35, 40, 45, and 50 days after silking(DAS). Germination test was performed using paper towel method. Mean germination percentages across eight hybrids showed the highest value at 45 DAS. There were significant differences among genes and within gene for germination. Shrunken-2 hybrid Mecca was higher than su hybrids for germination, indicating that sh2 would not be poorer than su Late harvesting beyond the optimal harvesting date might not be desirable because of more lodging and ear rots. Theoretical optimal harvesting date estimated from the regression equation was 40.9 DAS, however, practical date for harvesting would be a few days later than the estimated date if seedling vigor might be considered. Kernel dry weight per ear showed similar response to germination. Regression equation showed the highest kernel dry weight at 40.7 DAS. Significant correlations between kernel dry weight and germination were observed, impling that kernel dry matter accumulation would be an important factor for germination.

• 한국약용작물학회지
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• 제24권1호
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• pp.21-26
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• 2016

Background : Acer pictum is a deciduous tree belonging to the family Aceraceae. This study was conducted to collect basic data on mass propagation techniques by surveying the germination and growth characteristics of A. pictum seeds. Methods and Results : A. pictum seeds were harvested in 2014 on August 19, September 5, September 29 and October 31. The seeds were then sown on the same dates they were harvested. A portion of seeds harvested in August 2014 were stored at low temperatures and subsequently sown on March 11, 2015. The germination rate of A. pictum seeds was highest in seeds that were stored harvested on October 31. Mean germination time (MGT) was shortest and germination velocity (Rs) was fastest in seeds harvested on October 31. Root collar diameter, total root length, and dry weight were also highest from seeds collected October 31. Conclusions : A. pictum seeds harvested on October 31 had highest germination and growth rates compared with seeds harvested on earlier dates. It is expected that these results demonstrating optimum harvesting and sowing dates will be applicable to future seedling production for this tree species.

• 한국자원식물학회지
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• 제11권2호
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• pp.136-141
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• 1998

To give some information on the harvest and storage of Chinese yam (Dioscorea opposita), the experiment was done to examine the effect of its harvesting date and storage method on tuber weight, tuberrelated characters during the storageor at the end of storage. The yam tubers harvested 4 times at 20 days interval from Oct. 15 were stored with different storage methods(pit, room and cold temperature) and on Mar.15. all the characters were measured. Fresh weight of the tuber harvestedafter Nov. 5 and stored were greater than that done on Oct. 15 while dry tuber weight did not have any difference between the harvesting dates. The fresh weigth done directly from the field on Mar. 15 was higher compared to the other harvesting dates owing to its higher moisture content. The rate of sound tuber stored at room or cold temperature condition was higher than that at the field at which the rate was greater at the harvest after late nov. compared to the earlier harvests. Although the two storages were similar at sound tuber rates and marketable yield, the tuber weight was more reduced when stored at room temperature than when done at cold temperature . Brightness and value 'b' of chromaticaity realted to the tuber coloring and sugar content were higher but moisture content was lowerwhen harvested on Oct. 15 than the other havesting dates. All the characteristics realted to the marketability after storage were nearly same when stored at room and cold temperature. Value 'a' of chromaticity and sugar content were higher when harvest on Mar. 15 than when harvested before Dec. 15 but the 'b' value and mositure content were reverse results.

• 한국초지조사료학회지
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• 제26권2호
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• pp.97-104
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• 2006

본 연구는 수확기에 따른 호밀 품종간의 사초생산능력을 구명하기 위하여 수행하였다. 시험구는 분할구 배치법으로 주구는 4월 20일과 4월 30일의 수확시기를, 세구는 'Kodiak', 'Koolgrazer', 'Danko', 'Homil22', 'Olhomil' 품종으로 하였다. 조기수확시의 건물 함량은 각각 17.8%로 만기수확시의 20.0% 보다 낮았으나, 조단백질 및 TDN 함량에 있어서는 만기수확시 보다 높았다. 공시품종 간에는 건물, 조단백질 및 TDN 함량에 있어서 유의적인 차이가 있었다. ADF, NDF, ADL 및 cellulose 함량은 조기수확이 만기수확시 보다 낮았으나, hemi-cellulose 함량은 조기수확이 만기수확시 보다 높았다. 공시품종 간에는 조생품종의 섬유소함량이 다른 품종에 비하여 높았다. 조기수확시의 건물, 조단백질, IVDDM 및 TDN 수량은 각각 7,839, 1,468, 6,077 및 5,128kg/ha로 만기 수확시의 11,003, 1,813, 8.032 및 6,857kg/ha 보다 낮았으며 공시품종 간에는 조생품종이 다른 품종에 비하여 높았다. 시험에서 얻어진 결론은 사초용 호밀의 수확시기를 고려할 때 수량과 사료가치를 높일 수 있는 방법은 조생호밀품종에 만기수확을 조합하는 사초생산기술에 의해서 가능하다는 것이다.

• 한국초지조사료학회지
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• 제43권3호
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• pp.156-161
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• 2023

This study was conducted to determine the appropriate seeding dates by verifying the difference in winter survival and productivity of alfalfa according to fall sowing dates in the central area of South Korea. The experiment was conducted for 2 years (2020 and 2021) at the field in the Department of Animal Resources Development, NIAS located in Cheonan. Sowing dates started from September 18 to November 8 with 10 days of intervals during 2020 and 2021; SO1 (September 18), SO2 (September 28), SO3 (October 8), SO4 (October 18), SO5 (October 28), and SO6 (November 8). After sowing, the winter survival rate was measured in the spring of the following year, and the dry matter yield was measured by harvesting at 10% flowering and harvesting five times a year. SO6 failed to winter survival, and SO5 also had a lower winter survival rate than SO1~4 (p<0.05). The average annual dry matter yield of alfalfa linearly decreased with delaying sowing dates (p<0.05). The feed value did not differ in the same year by delaying the sowing date in the same year. These results suggest that sowing date should be started before October 18 to increase winter survival and productivity of alfalfa in the central area of South Korea.