This study aimed to discuss the optimal seeding and harvesting dates with growing degree days(GDD) via meta-data of whole crop maize(WCM). The raw data (n=3,152) contains cultivation year, cultivars, location, seeding and harvesting dates collected from various reports such as thesis, science journals and research reports (1982-2012). The processing was: recording, screening and modification of errors; Then, the final dataset (n=121) consists of seeding cases (n=29), and harvesting cases (n=92) which were used to detect the optimum. In addition, the optimal periods considering tolerance range and GDD also were estimated. As a result, the optimum seeding and harvesting periods were 14th April ~ 3rd May and 15th August ~ 4th September, respectively; where, their GDDs were 23.7~99.6℃ and 1,328.7~ 1,602.1℃, respectively. These GDDs could be used as a judge standard for selecting the seeding and harvesting dates.

This study was conducted to investigate the effect of sowing and harvesting dates on agronomic characteristics and feed values of rye and triticale at Sanchoeng, South Korea. The experimental design consisted of the different sowing and harvesting dates as follows; rye (Secale cereale L., cv. Gogu) of sowing (October 15, 25, and November 5) in 2015 and harvesting (April 20, May 1 and May 11) in 2016, and triticale (X Triticosecale, cv. Joseong) of sowing (October 15, 25, and November 5) in 2015 and harvesting (May 18, 28, and June 7) in 2016. In rye, fresh and dry matter (DM) yields increased (p<0.05) with the delayed-harvesting date. Crude protein (CP) content and relative feed value (RFV) decreased (p<0.05) with the delayed-harvesting date, but neutral detergent fiber (NDF) content increased (p<0.05). In triticale, fresh and dry matter (DM) yields increased (p<0.05) with the delayed-harvesting date. The CP content decreased (p<0.05) with the delayed-harvesting date, but NDF content and RFV increased (p<0.05). This study concluded that rye sown in the middle of October then harvested in early May, and the triticale sown at the end of October then harvested at the end May are recommended to increase dry matter yield and feed value.

This study was carried out from 2015 to 2016 to identify the suitable sowing and harvesting dates of summer crops in the mountain of Yeongnam, South Korea. The experimental design consisted of the different sowing and harvesting dates as follows: corn hybrid (Z. mays, Kwangpyeongok) of sowing (May 8, 19, and 27) and harvesting (August 10, 20, and 30); sorghum×sorghum hybrid (Sorghum bicolor x Sorghum bicolor, SS405) of sowing (May 27, June 19 and June 27) and harvesting (August 10, 20, and 30). In corn hybrid, ear rate and dry matter (DM) yield decreased (p<0.05) with the postponement of sowing date. Otherwise, ear rate and DM yield increased (p<0.05) with the postponement of harvesting date. Crude protein content decreased (p<0.05) with the postponement of sowing date, but neutral detergent fiber content increased (p<0.05). In sorghum×sorghum hybrid, plant length and DM yield with the postponement of harvesting date increased (p<0.05), while crude protein content with the postponement of harvesting date decreased (p<0.05). This study concluded that sowing corn hybrid in early May and sorghum×sorghum hybrid in early June then harvest in the middle of August was recommend to increase dry matter yield and feed value.

The effect of transplanting and harvesting dates on growth, yield, and quality of sweetpotato varieties was studied. Three sweetpotato varieties, Yulmi, Singeonmi, and Dahomi, were transplanted on 23 Apr., 21 May, 5 June, 15 June, 25 June, 5 July, 15 July, and 25 July. Fresh vine weight and marketable storage root yield of the three varieties were the highest in transplanting plots on 23 April and 21 May, respectively, and those tended to decrease when transplanting dates were late after May. GDD (Growing Degree Days) and cumulative radiation seemed to be related to marketable storage root yield. Number of marketable storage root per plant, average weight of marketable storage root, and marketable storage root yield were significantly different according to transplanting dates. Marketable storage root yield showed significantly positive correlations with fresh vine weight, number of marketable storage roots, and average weight of marketable storage roots. Hardness and dry matter content of storage root showed significantly positive correlations with starch content and decreased with late transplanting dates in Yulmi and Singeonmi varieties. Pasting temperature showed significantly positive correlations with soluble solid content, dry matter content, and amylose content, but it showed significantly negative correlations with breakdown. Setback was significantly different among varieties, but it was not significantly different in transplanting dates.

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

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 5

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 n

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 effec

In order to reduce the problems from overlapping between rye harvest and maize seeding dates, and also to improve the growth, productivity and nutritive value of rye (Secale cereale L.), an experiment was carried out to determine the variety effect of rye

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.

‘추황배’ 배 과수원에 봉지종류와 수확시기를 달리하였을 때 수상의 과피흑변과 발생과 수확 후 과실품질에 어떠한 영향을 미치는 지를 규명하기 위하여 수행되었다. 본 시험은 두 가지로, 첫 번째는 네 종류의 봉지(신문지외지/황색내지, 회색외지/황색내지, 신문지외지/흑색내지, 신문지외지/적색내지) 시험이었고, 두 번째 시험은 만개 후 160일, 170일, 180일, 190일, 200일에 수확하였을 때 과피흑변과와 과실품질을 조사하였다. 신문지외지/황색내지의 봉지가 투광도와 투기도 및 수분투과도인 물리성이 향상되었고, 신문지외지/적색내지가 봉지물리성이 낮은 경향을 보였다. 신문지외지/황색내지는 수상에서의 과피흑변과 발생이 나타나지 않았고, 신문지외지/적색내지를 괘대처리 한 과실에서는 약 12.7%의 과피흑변과가 관찰되었다. 과피흑변은 주로 과실의 중앙부와 과정부에서 집중적으로 발생되었다. 신문지외지/적색내지를 이용한 유대재배는 평균과중, 경도, 산도, 그리고 착색이 향상되는 경향을 보였다. 수확시기가 늦어질수록(만개 후 190일과 200일에 수확) 과피흑변, 평균과중, 당도가 증가되었고 반대로 과실경도와 산도는 감소되었다.

최근 지구온난화에 따라 평균기온이 상승하고 무상기간이 길어지고 재배기간도 길어지고 있다. 이상기상으로 재해가 심화되는 위기요인이 있으나 작물 재배기간이 연장되고, 이러한 기회요인을 적극 활용한 작부체계가 연구가 전무한 실정이다. 봄 재배 시 7월 하순~8월 상순의 홍수출하로 인한 가격폭락 문제의 해법을 제시하고 신선한 풋옥수수 공급 기간을 늘리기 위한 찰옥수수 2기작 작부체계를 확립하기 위해 생태형 및 파종시기별 수확적기를 구명에 관한 연구가 필요한 현실이다. 본 연구는 2009~2010년에 국립식량과학원 시험포장에서 찰옥수수의 조생종 품종 찰옥 1호와 만생종 품종 일미찰, 찰옥 4호를 재료로 하여 풋옥수수의 2기작 재배 실험을 수행한 것으로 그 결과를 요약하면 다음과 같다. 1. 2기작재배에 따른 출사일수는 후기작으로 갈수록 짧아지고, 출사에서 수확까지 소요되는 일수가 증가하였다. 4월 상순~하순에 파종할 경우 생태형에 관계없이 수확기는 출사 후 23~25일 정도 소요되었다. 조생종인 찰옥1호를 7월 상순~하순에 파종할 경우 수확기는 출사 후 28~31일 정도 소요되고, 중만생종인 일미찰은 7월 상순~중순에 파종할 경우 수확기가 출사 후 29~31 일, 7월 하순에 파종할 경우 약 39일 정도 소요되었다. 2. 파종에서 수확까지 적산온도는 약 1700℃~2100℃ 정도였고, 출사 후 수확까지의 최소 소요 적산온도는 약 600℃~680℃ 였다. 3. 이삭길이는 전기작보다 후기작에서 다소 길어지고 일미찰과 찰옥 4호는 증가하였는데, 찰옥 1호는 1기작재배에 비하여 2기작재배에서 감소하였다. 4. 상품 이삭수는 2기작재배가 1기작재배에 비하여 찰옥 1호는 약 101%였고, 일미찰과 찰옥 4호는 92% 및 99%로 감소하였다. 수확량은 2기작의 경우 전기작에 비해 약 74%~78%정도였다. 5. 찰옥수수 2기작 재배는 파종 후 수확까지의 생육기간은 전기작에 비해 짧았으나, 출사 후 수확기까지 소요되는 기간은 오히려 길어졌다.

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.

맥문동(麥門冬)의 괴근비대기간중(塊根肥大期間中)의 괴근비대양상(塊根肥大樣相), 수량(收量)및 성분변이(成分變異)를 조사(調査)하기 위하여 맥문동 1호를 공시(供試)하여 '92년 .4월 10일에 30×10cm로 정식(定植)해서 다음해 1월 15일부터 4월 15일까지 15일 간격(間隔)으로 수확하여 수량관련형질(收量關聯形質) 및 성분변이(成分變異)를 조사한 결과를 요약(要約)하면 다음과 같다. 1. 맥문동의 지상부 생육은 월동중(越冬中)에도 계속 증가(增加)하였고 괴근(塊根)의 형성(形成)은 1월 15일 이전에 결정(決定)되는 것으로 판단(判斷)되었다. 2. 괴근의 비대(肥大)는 월동중(越冬中)에 진행(進行)되며 2월 28일 이후에 완료(完了)되는 것으로 나타났다. 그리고 괴근수량은 3월 15일에서 387kg/10a로 최고수량(最高收量)을 보여 수확적기(收穫適期)로 판단(判斷)되었다. 3. 괴근의 전당함량(全糖含量)은 1월 30일에 가장 높았고, 그 이후 점차(漸次) 감소(減少)하여 3월 15일에 가장 낮으며, 전당함량(全糖含量)과 수량(收量)과는 고도(高度)의 부(負)의 유의상관(有意相關)(-0.788**)을 보였다.