• 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.

• 농업과학연구
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• 제20권2호
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• pp.125-132
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• 1993

형태적(形態的)으로 서로 다른 두 교잡종(交雜種) 옥수수의 물질(物質) 생산성(生産性) 형질(形質)(source)에 대한 저장(貯藏) 수용능력(受容能力)(sink)효과를 비교하고자 대조구(對照區)인 무처리(無處理)를 포함하여 전체엽(全體葉) 제거구, 첫째이삭 절위(節位)의 상위엽(上位葉) 제거구, 첫째이삭 절위(節位)의 하위엽(下位葉) 제거구, 첫째이삭만 제거구등 5개 처리에 대한 생육특성(生育特性) 및 종실중(種實重)에 미치는 효과를 요약하면 다음과 같다. 1. 간장(肝腸)은 두 공시 교잡종(交雜種) 모두 무처리(無處理)에서 가장 컸으나 기타 처리간에는 큰 차이가 없었다. 2. 엽중(葉重)은 상위엽제거구(上位葉除去區)와 하위엽제거구(下位葉除去區)에서 분얼형(分蘖型)이나 무분얼형(無分蘖型) 모두 같은 수준이었으나 교잡종간에는 분얼형(分蘖型)의 엽중(葉重)이 무분얼형(無分蘖型)보다 5-10g정도가 많았으며, 줄기무게 엽중(葉重)과 비슷한 경향이었다. 4. 공시종 모두가 입중(粒重)은 무처리에 비해 낮았는데 특히 무처리에 비해 상위엽(上位葉) 제거구가 60%정도 낮았고 하위엽(下位葉)제거구는 40%정도가 낮았는데 분얼형(分蘖型) 보다는 무분얼형(無分蘖型)의 옥수수에서 입중(粒重)의 감소가 켰다. 5. 분산분석(分散分析) 결과 줄기중(重)과 입중(粒重)은 교장종간에 큰 차이를 보였고, 처리간(處理間), 교잡종(交雜種)과 처리간(處理間) 상호작용(相互作用)에 있어서는 조사된 모든 특성(特性)에서 유의성(有意性)이 인정 되었다. 6. 전체(全體) 건물중(乾物重)에 대한 각 부위별(部位別) 기여도(寄與度)를 보면 무처리에서는 입중(粒重), 엽중(葉重), 줄기중(重) 순(順)으로 나타났고 상위엽(上位葉)제거구는 줄기중(重), 엽중(葉重), 입중(粒重) 순(順)이었는데 비해 하위엽(下位葉)제거구는 입중(粒重)의 기여(寄與)가 매우 컸으며 다음은 엽중(葉重)과 줄기무게가 같은 수준으로 나타났다.

• Plant Resources
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• 제4권1호
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• pp.31-35
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• 2001

Major characteristics of new Waesungri maize inbred line has multi-tiller and ears: five to six tillers and seven to eight ears per plant and flowering date of Waesungri was delayed about 18 and 24 days compared to Mo17 U.S line and IK$_4$ Korean local lines, respectively. Number of ears, fresh and dry weight per plant were significantly different among all tested hybrids including Waesungri/Sinkihong hybrid under different planting times and densities. Especially, both fresh and dry weight of IK$_1$/FR140//Waesungri F$_1$hybrid were significantly higher at high planting density. In kernel weight per unit area, Wnesungri/Sinkihong hybrid was high at high density and IK$_1$/FR140//Waesungri hybrid was high at low planting density. As results of analysis of variance, flowering date was shown a significantly different both planting times and varieties, while other characters including stem height were shown very variable in interactions with enviromental factors.

• 한국작물학회지
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• 제33권1호
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• pp.70-73
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• 1988

풋찰옥수수의 수확적기를 구명하기 위하여 1984년 수원과 청주에서 홍천재래을 공시하여 출사(수원에서는 수분)후 15일부터 40일까지 5일 간격으로 6회에 걸쳐 수확하여 종실의 발육, 수분 및 전당함량, 삶은 옥수수의 맛, 찰기, 경도 등을 조사한 결과를 요약하면 다음과 같다. 1. 입장과 입폭은 출사후 15일부터 30일까지 크게 증가하였고 그 후 다소의 증가에 그쳤으며 입후는 출사 20일 이후 거의 증가되지 않았다. 2. 생체 100립중은 출사후 30일까지 크게 증가된 반면 그 후에는 다소의 증가에 그치였고 건물 100립중은 출사후 15일부터 40일까지 거의 직선적인 증가를 보였다. 3. 종실의 수분함량은 성숙정도가 진전됨에 따라 직선적인 감소를 보였다. 전당함량은 출사후 20일에 가장 않았고 그 후 감소되었다. 4. 맛과 찰기는 출사후 15일부터 30일까지 크게 증가되었고 맛은 그 후 감소되었으나 찰기는 출사후 35일까지 같은 수준을 유지하였다가 그 후 다소 감소되었다. 식용에 알맞는 경도는 출사후 30∼35일 이었다.

• 한국작물학회지
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• 제30권3호
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• pp.277-286
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• 1985

다수다얼성 재래종 옥수수 (MET라 칭함)의 자식5세대인 3계통을 Siliage생산을 목적으로 상이한 재식밀도에서 대조품종인 수원 19호, 부여 ＃3 $\times$ ＃2를 공시하여 재배한 결과 그 성적은 다음과 같다. 1. 수확기의 초장에 대한 분산분석은 품종간에 유의차가 인정되지 않았으며, 특히 MET 계통은 교잡종이나 합성 품종에 비해 초기생육이 늦었는데 이는 MET계통이 재내종으로 자식열세 현상때문이라 추측된다. 재식밀도의 차이에 있어서 공시 품종의 초장은 큰 효과를 기대할 수 없었다. 2 수확기에서 총생체중은 MET 1이 교잡종보다 10a당 2000kg이 많았으며 특히, 밀식구인 60$\times$20cm에서 가장 높았다. 3. 단위 면적당 건물중 역시 생체량과 같은 경향의 증감으로 나타났으며, 10a부 MET 1의 총건물중은 2.4톤으로 수원 19호보다 10% 높았는데, 밀식구인 60$\times$ 20cm에서 그 효과가 컸다. 4. 10a당 종실수량은 MET 1 이 교잡종에 비해 소식구에서 낮았다. 5. MET계통의 평균 분얼수는 4.5개인 반면에 교잡종과 합성품종에서는 나타나지 않았다. 6. MET계통의 재배상의 가장 큰 문제로 도복율이 높았는데 MET계통의 착수고를 낮춤으로서 피해를 경감시킬 수 있을 것으로 생각되며 7. MET계통의 100입중은 9gr인 반면에 교잡종과 합성품종은 30gr정도이었다.

• 한국작물학회지
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• 제45권3호
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• pp.181-184
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• 2000

보리호위축병(BaYMV) 상습 발병지에서 쌀보리인 백동을 공시하여 건전주와 이병주의 농업형질 등을 비교 조사한 결과를 요약하면 다음과 같다. 1. 보리호위축병에 이병된 주는 건전주에 비하여 SPAD 값이 13.7정도 낮은 값을 보였으며, 출수는 10-11일정도 지연이 되었고, 건물중이 75%, 간장은 68%, 수수가 49% 감소하였다. 2. 이병주의 절간장 감소는 이삭을 제외한 상부로부터 제1-6절간에서 나타났으며, 그 중 제3-5절간장에서 감소율이 75-80%로서 가장 켰다. 3. 보리호위축병에 의하여 망장이 17-19%, 입수가 47%, 천립중이 60%, 주당 입중이 78% 감소하였으며, 종실에서는 폭과 두께에서 감소되었고, 종피색의 색도에서는 명도는 낮았으나 적색도는 높게 나타났다.

• Asian-Australasian Journal of Animal Sciences
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• 제24권10호
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• pp.1399-1406
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• 2011

This study aimed to establish the optimum level of palm kernel meal in the diet of Santa Ines lambs based on the sensorial characteristics and fatty acid profile of the meat. We used 32 lambs with a starting age of 4 to 6 months and mean weight of $22{\pm}2.75kg$, kept in individual stalls. The animals were fed with Tifton-85 hay and a concentrate mixed with 0.0, 6.5, 13.0 or 19.5% of palm kernel meal based on the dry mass of the complete diet. These levels formed the treatments. Confinement lasted 80 days and on the last day the animals were fasted and slaughtered. After slaughter, carcasses were weighed and sectioned longitudinally, along the median line, into two antimeres. Half-carcasses were then sliced between the 12th and 13th ribs to collect the loin (longissimus dorsi), which was used to determine the sensorial characteristics and fatty acid profile of the meat. For sensorial evaluation, samples of meat were given to 54 judges who evaluated the tenderness, juiciness, appearance, aroma and flavor of the meat using a hedonic scale. Fatty acids were determined by gas chromatography. The addition of palm kernel meal to the diet had no effect on the sensorial characteristics of meat juiciness, appearance, aroma or flavor. However, tenderness showed a quadratic relationship with the addition of the meal to the diet. The concentration of fatty acids C12:0, C14:0 and C16:0 increased with the addition of palm kernel meal, as did the sum of medium-chain fatty acids and the atherogenicity index. Up to of 19.5% of the diet of Santa Ines lambs can be made up of palm kernel meal without causing significant changes in sensorial characteristics. However, the fatty acid profile of the meat was altered.

• 한국작물학회지
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• 제61권3호
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• pp.196-207
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• 2016

In monsoon climates, persistent shade is a troublesome weather condition with an impact on the growth and yield of corn (Zea mays L.). We imposed 7, 14, 21, and 28 days of consecutive shade (CS) on Gwangpyeongok and P3394 corn hybrids at the beginning of the kernel filling stages. Shade had little impact on leaf area and dry matter accumulation in the stem and leaves. However, dry matter accumulation in the ear was severely reduced by approximately 28% and 53% after 14 and 28 days of CS, respectively. For the components of grain yield, 7 and 14 days of shade did irreparable damage to the number of filled kernels, the kernel number per ear row, and the percent of filled kernels, but did little damage or reversible damage after removal of the shade to the 100-grain weight and the row number per ear. Shade significantly reduced the relative growth rate (RGR) due to a decrease in the net assimilation rate (NAR). These results suggest that source activity limitation by shade during the kernel filling stages leads to the inhibition of sink activity and size. The yield of biomass, ear, and grain logistically declined as the length of CS increased. Probit analysis revealed that the number of days of CS needed to cause 25% and 50% reductions in grain yield were 3.7 and 23.1, respectively. These results suggest that the plant yield loss induced by shade at the beginning of the kernel filling stages is mainly achieved within the first 7 days of consecutive shade.

• Journal of Microbiology and Biotechnology
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• 제13권1호
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• pp.64-69
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• 2003

Pseudomonas chlororaphis HS21 was isolated from a soil sample and found to produce medium-chain-length polyhydroxyalkanoates (MCL-PHAs) using palm kernel oil (PKO) as the sole carbon source. Up to 3.3 g/1 dry cell weight containing $45\%$ MCL-PHA was produced, when the strain was grown for 21 h in a jar fermentor culture containing 5 g/1 PKO. The polymer produced from PKO consisted of unsaturated monomers of $7.3\%$ 3-hydroxy-5-cis-tetradecenoate and $2.3\%$ 3-hydroxy-5,8,-cis, cis-tetradecadienoate as well as saturated even-carbon number monomers ranging from $C_6\;to\;C_14$, as determined by GC and El GC/MS The PHA was a transparent, sticky material at room temperature. A differential scanning calorimetric analysis revealed that the polymer was amorphous with a $-44^{\circ}C$ glass transition temperature. The number average molecular weight and polydispersity index of the PHA were 83,000 and 1.53, respectively. Although the PHA was practically biodegradable, its degradability was lower than that of poly(3-hydroxyoctanoate) based on a comp:trison of the clear zones formed by growing PHA depolymerase-producing bacteria on an agar plate containing the respective polymers.

• 한국농공학회논문집
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• 제46권1호
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• pp.99-105
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• 2004

The present agricultural water quality standards are set by a policy goal. This is intended for water quality management of public water resources, but not for the use of water resources. These standards were not determined by considering the influence of water quality on the safety of agricultural produce and the growth, yield and quality of agricultural crops. Thus, this study was carried out to investigate the influence of irrigation water quality on the growth, yield, and grain quality of rice and acquire fundamental knowledges to set up irrigation water quality standards. The pot experiment was conducted with 4 treatments using irrigation waters with various total nitrogen concentrations (control, 1, 5, 10, 20mg/L) and replicated four times with randomized block design. The results of this study showed that plant height, number of tiller, plant dry weight, the uptake of N, P, and K, and rice protein contents tended to increase as the T-N concentration in irrigation water was increased. In addition, grain yield at T-N 20 mg/L was significantly higher than in the control, but the percentage of head rice was slightly lower due to the increase of green kernel and white belly/core kernel.