The objective of this study was to quantify and characterize the inorganic nitrogen and phosphorus outflow loading from different water managements in paddy fields. We investigated the NO3-N, NH4-N, and PO4 in runoff from paddy fields in Iksan. The three different water management treatments were conventional continuous irrigation at 4 and 8 cm water levels, and intermittent irrigation at a 4 cm water level. The concentration of NO3-N at the early growth stage in surface water was 6.11 mg L-1, and then it gradually decreased. The downward curve increased slightly with additional nitrogen fertilization at the panicle initiation stage, and then it continued to decrease. The NH4-N concentration was 5.26 mg L-1, and that of PO4 was 0.70 mg L-1 at the early growth stage. However, the concentration of NO3-N peaked at 8.79 mg L-1 directly after transplantation and then decreased rapidly throughout the growing season. The amount of NH4-N runoff was 1.86 kg ha-1 in the plot with intermittent irrigation, and 2.0 kg ha-1 and 2.1 kg ha-1 in the plots with water depths of 4 and 8 cm, respectively. The NO3-N runoff was 7.43 kg ha-1 in the plot with intermittent irrigation, 8.62 kg ha-1 in the plot with a water depth of 4 cm, and 10.25 kg ha-1 in the plot with a water depth of 8 cm. In addition, the PO4 runoff was 0.42 kg ha-1 in the plot with intermittent irrigation, 0.48 and 0.55 kg ha-1 in the plots with water depths of 4 and 8 cm, respectively. The saving effect of irrigation water was 28.5% than that of conventional water management treatments, and the amount of nitrogen runoff was decreased by 18.5% with intermittent irrigation. However, the phosphorus runoff was not different between the different water management treatments in paddy fields.

This study investigated the comparative growth characteristics, yield, chemical compositions, and nutritive yield of Italian ryegrass cultivars harvested in a paddy field. The experimental design was a randomized block design with three replicates. The treatments consisted of seven Italian ryegrass cultivars (Kogreen, Kowinmaster, Hwasan 101, Kowinnearly, Kospeed, Sahalie select, and Strike). The planting date was October 21, 2009 and the sample harvest was occurred on May 21, 2010. Dry matter yield was higher in Kowinnerary and Kogreen than in the other varieties (p<0.05). Crude protein and ether extract contents were highest in Hwasan 101 and lowest in Kospeed. The content of total digestible nutrients did not differ among the Italian ryegrass varieties. The amino acid contents were in the order Hwasan 101 > Strike > Kowinnearly > Kogreen > Sahalie select > Kospeed > Kowinnearly (p<0.05). Fructose content was highest in Kospeed, while glucose and sucrose contents were highest in Hwasan 101. The results of this study indicate that Kowinnearly, in terms of dry matter yield, and Hwasan 101, in terms of feed value (chemical composition and free sugar content), may be recommended for forage production in a paddy field.

Greenhouse gas emission from agricultural land is recognized as an important factor influencing climatic change. In this study, the national CO2 emission was estimated for paddy soils, using soil GHG emission model (DNDC) with 1 km2 scale. To evaluate the applicability of the model in Korea, verification was carried out based on field measurement data using a closed chamber. The total national CO2 emission in 2015 was estimated at 5,314 kt CO2-eq, with the emission per unit area ranging from 2.2~10.0 t CO2-eq ha-1. Geographically, the emission of Jeju province was particularly high, and the emission from the southern region was generally high. The result of the model verification analysis with the field data collected in this study (n=16) indicates that the relation between the field measurement and the model prediction was statistically similar (RMSE=22.2, ME=0.28, and r2=0.53). More field measurements under various climate conditions, and subsequent model verification with extended data sets, are further required.

The present study investigated the effects of different seeding rates on growth characteristics and seed productivity of the “Kowinearly” cultivar of Italian ryegrass (Lolium multiflorum Lam.) in paddy fields. Sowing Kowinearly in paddy fields under growing rice at the rates of 20, 30, 40, and 50 kg/ha resulted in seed yields of 1.57, 1.92, 2.06, and 2.09 ton/ha, respectively. Seed yield of Kowinearly was the highest at a seeding rate of 50 kg/ha (p<0.05), at which the cultivar was able to survive in winter and the weed ratio was low. Under these conditions, most growth characteristics such as winter survival (85%), weed ratio (10%), stems per square meter (1,006) were superior than those sown at other seeding rates (p<0.05). In addition, it has been reported that the economic efficiency of the 50 kg/ha seeding rate was higher than that of the other seeding rates.

In order to study the effect of barley, Italian ryegrass (IRG), and legume mixture on nitrogen fixation and transfer to grasses on spring paddy field, an experiment was carried out from Oct. 2006 to June 2007 in Naju, Korea. A split plot design with three replications was used for the experiment. One reference plot was assigned for each treatment to determine nitrogen fixation. Main plots consisted of Chinese milk vetch, crimson clover, forage pea, and hairy vetch with barley, respectively. Subplot treatment were barley or IRG with four seeding ratio of legumes (50:50, 60:40, 70:30, and 80:20). To estimate N fixation by legumes, 15N isotope dilution technique was used. 15N fertilizer [(15NH4)2SO4 solution at 99.8 atom N] was uniformly applied to 600 cm2 in the middle of each plot on April 15, 2007. Plots were harvest by hand on June 8, 2007. Dried sample were ground to a fine power and analyzed for total N isotope N. 15N was determined using elemental analyzer-isotope ratio mass spectrometry. The calculation of N transfer was determined with the isotope dilution method. The content of N was higher in legumes than that in barley or Italian ryegrass. Nitrogen level in forage pea was significantly higher than that of other legumes. There were significantly differences in N content between legumes in IRG mixture. Atom % 15N excess was significantly different in legumes with barley. The 60:40 sub plot had higher (p<0.05) atom % 15N than other seeding ratio treatments. The enrichment ranged from 0 to 0.58. Compared to barley, the enrichment of IRG with its accompanied legumes was higher, ranging from 0.38 to 1.0. The N derived from the atmosphere (Ndfa) ranged from 0% to 49.5% with barley-legume mixture. It ranged from 0 to 60.5% in IRG-legume plots. N transfer from legumes to neighboring grasses was 12.3 to 90.9 kg/ha for barley-legume mixture and 31.7 to 107.8 kg/ha for IRG plots. IRG plots showed higher N transfer for IRG-legume mixture in general based on difference method. Based on 15N dilution method, the N transfer was 0 to 36.1 kg/ha for barley-legume mixture and 0 to 50.6 kg/ha for IRG plots. There was a tendency toward higher N transfer on the difference method than that of the 15N dilution method.

This study was carried out to determine the effects of application levels of fertilizer and sowing methods on yields and nutritive values of Italian ryegrass (IRG) in early spring. Five fertilizer levels were used: Treatment 1, 100-80-80 kg/ha; Treatment 2, 120-100-100 kg/ha; Treatment 3, 140-120-120 kg/ha; Treatment 4, 160-140-140 kg/ha; Treatment 5, 140-120-120 kg/ha of N-P2O5-K2O with silicate fertilizer 200 kg/ha. Dry matter (DM) yield was 8,330 kg/ha in Treatment 5, 7,686 kg/ha in Treatment 4, and 7,347 kg/ha in Treatment 3. There was no significant difference in total digestible nutrients (TDN) content. The content of crude protein was the highest in Treatment 5. Dry matter ratio was the lowest in Treatment 5. In Treatment 3, DM yield was 7,347 kg/ha, when total amounts of fertilizers were applied at one time. However, DM yield was 7,405 kg/ha, when 50% of pre-planting fertilizer and 50% of supplementary fertilizer were applied at different time. There was no significant difference between total application and split application of fertilizers. However, DM yield was 9,469 kg/ha in application treatment with 100 kg/ha of additional urea at three to four leaf stages of IRG. Regarding DM yield by sowing methods of IRG, the following order was found: drill seeding (8,176 kg/ha) > rotary-broadcast seeding-stamping (7,957 kg/ha) > rotary-broadcast seeding (7,810 kg/ha) > broadcast seeding (7,347 kg/ha) > broadcast seeding-rotary (7,034 kg/ha). DM yield (59.57%) was the lowest in broadcast seedingrotary. Crude protein content was the highest with rotary work but the lowest with broadcast seeding.

The objective of this study was to determine the effect of harvesting time of rice on growth characteristics and dry matter yields of Italian ryegrass (Lolium multiflorum Lam., IRG) ‘Kowinearly’ after seeding them in paddy field. Experiments were performed in National Institute of Animal Science, RDA (Cheonan, Choongcheongnam-do province of Korea) for four years (2011~2014). Italian ryegrass variety ‘Kowinearly’ was seeded at experimental paddy fields before rice harvest in late September. Rice were harvested at 10, 20, and 30 days after seeding of IRG. As the harvest time of rice became later, the number of tillering before winter was reduced and IRG plant length before winter was shorter. The dry matter yield of IRG was also reduced. When rice were harvested at 20 days and 30 days after sowing of IRG compared to the rice harvested in autumn at 10 days after sowing of IRG, the number of tillering for IRG before winter was decreased by an average of 19% and 40%, respectively. The winter survival ratio of IRG was decreased by an average of 13% and 19%, respectively. Their dry matter yields were also reduced by an average of 8% and 19%, respectively. The heading date was different from each other in three years. The plant length at the time of IRG harvest in the spring was not significantly different among treatment groups. Taken together, our results suggest that when Italian ryegrass is grown in paddy fields by the method of ‘seeding of IRG before rice harvest’, rice should be harvested as soon as possible after sowing of IRG ‘Kowinearly’ in the autumn to increase forage productivity.

To identify the limited and adaptable sowing date and select the double cropping system, two different cropping systems such as potato (Sumi, Chubaek) - maize (Ilmichal, Yanganok) and maize (Ilmichal, Yanganok) - potato (Chubaek) were conducted in paddy and upland field condition. We observed and compared plant growth characteristics, yield potential, and income at two different cropping systems. Average yield of potato (first crop, Sumi) in paddy field was higher than upland field when planted at March 20. The plant height and stem length of the second cropping potato sown at August 20 were 30 cm higher than first cropping potato sown at March 20, which is reduced about 1,500 ~ 2000 kg/ 10a of the second cropping potato yield. Stem length and the first ear height of the first cropping corn Ilmichal sown at April 15 in paddy field were 5~10 cm higher than upland field and ear property was similar. Silking date of the second cropping corn Ilmichal sown at July 3 were about 19 day earlier than the first cropping corn Ilmichal sown at April 15, However, both stem length and the first ear height of the second cropping corn Ilmichal sown at July 3 were small compared to those of sown at April 15. Ear property of Yanganok sown at June 19 and July 3 were similar in both paddy and upland field. Fresh weight yield (aerial part, kg/10a) of Yanganok sown at June 19 were 500 ~ 700 kg/10a higher than those of sown at July 3. In view of income comparison between two different cropping systems, Chubaek-Ilmichal and Chubaek-Yanganok cropping systems were best combination, Ilmichal-Chubaek and sumi- Yanganok cropping systems were worst combination in upland field. Chubaek-Ilmichal and Chubaek- Yanganok cropping systems were best combination, Ilmichal-Chubaek cropping systems was worst combination in paddy field.

답전윤환 옥수수 8품종 및 수수 7품종 재배포장에서 조명나방 발생 및 수확 특성을 조사하였다. 매주 이뤄진 성충 트랩 조사에서 조명나방 밀도는 정식 2주 후부터 급격히 증가하여 6월 중순에 최성기에 도달 후 감소하다 9월 초 소폭 증가 후 감소하였다. 조명나방 유충에 의한 피해주 수와 침입공수를 매주 옥수수 미백2호와 대학찰 그리고 수수 남풍찰과 동안메를 대상으로 조사하였다. 그 결과, 대학찰과 미백2호에서 피해주가 각 20주당 19주와 18주였고, 주당 침입공수도 6월말부터 꾸준히 증가하여 수확기인 7월말에 대학찰은 주당 평균 1.8개, 미백2호는 1.4개로 나타 났다. 수확기에 옥수수 8품종에 대한 피해율과 침입공수를 조사한 결과, 대학찰 94%, 미백2호 92%, 일미찰 71%, 얼룩찰1호 64%, 찰옥4호 54%, 미흑찰 52%, 흑점2호 45%이었다. 주당 침입공수는 일미찰이 1.21개였고 나머지 품종들에서는 1개 미만이었다. 또한 옥수수 각 품종별로 이삭 10개씩 3반복으로 조명나방 유충에 의한 이삭 피해율을 조사한 결과, 일미찰 50%, 흑진주찰 40%, 대학찰 37%, 미흑찰과 흑점2호 13%, 얼룩찰 7% 그리고 미백2호 3% 등이었다. 수수 주요 재배품종들인 남풍찰 및 동안메는 정식 후 2개월까지 20주 평균 4주 미만으로 피해를 입다가 8월 초 에 피해가 급증하여 평균 피해주는 남풍찰이 13주, 동안메는 9.2주였고 주 당 침입공수도 8월 초부터 나타나기 시작해 남풍찰은 주당 평균 1.06 개, 동안메는 주당 평균 0.46개였다. 수확기 수수 품종별 조명나방에 의한 피해율을 조사한 결과, DS-202 95%, 목탁수수 76%, 소담찰 75%, 남 풍찰 67%, 앉은뱅이수수 57%, 동안메 46% 그리고 황금찰 34%로 7품종 모두 조명나방에 의해 높은 피해를 입었다. 침입공수 또한 피해율에 비 례해서 DS-202(1.7개), 목탁수수(1.4개), 소담찰(1.3개), 남풍찰(1.1개), 앉은뱅이수수(1개), 동안메(0.5개) 그리고 황금찰(0.4개)로 관찰되었다. 한편, 답전윤환 옥수수 및 수수 포장에서 조명나방 피해와 수확 특성은 인과관계를 보이지 않는 것으로 나타났다. 이상의 결과는 답전윤환 옥수수 및 수수 재배포장에서 조명나방의 관리대책을 구축하는데 활용될 수 있을 것으로 기대한다.

An insect is a ectothermal animal that is vulnerable to the temperature change. As climate change accelerated, the distribution of insects have been rapidly changed. Rice is the most important crop in Korea as it is a staple for Korean people. In the rice paddy, migratory pests from south-east Asia have seriously damaged on the crop. As climate changed, the spatial distribution of pest and their effects on rice paddy may be changed. Therefore, monitoring the pest populations is a basis for establishing further research for pest management strategy against these migratory insect pests. As the first year for this monitoring project, we set 20 rice paddies in Gyeonggi-do and Chungcheongnam-do as continuous monitoring sites for five major migratory pests and summarized the first year’s data. Based on it, we will develop better monitoring plan as well as analysis methods.

The occurrence pattern of lepidopteran adults in a paddy-upland rotation field and an organic upland field for 8 maize and 7 sorghum varieties was surveyed from May 8 to September 27, 2016. In addition, their damage ratio and the invasive pores by Ostrinia furnacalis larvae as well as harvest yields were monitored. The density of the lepidopteran adults in two fields showed similar pattern, although a little different pattern in Heliothis assulta. The damage ratio of maize and sorghum varieties by O. furnacalis at harvest periods was depended on both varieties and cultivated environments. A middle negative linear correlation was observed in damage ratios vs yields, the number of invasive pores vs yields, and the number of larvae in corn ears vs yields, but there was not a specific correlation between the damage ratio vs the number of invasive pores. These results may be useful for the establishment of a management strategy to control oriental corn borer in paddy-upland rotation or organic upland fields for maize and sorghum.

The object of this study conducted to investigate the effect of paddy-upland rotation cropping system on soil properties and crop productivity in newly reclaimed tidal land. Five types of paddyupland rotation cropping system were evaluated : Rice-Rice (RR) Rice-Maize (RM), Mize-Maize (MM), Rice-Soybean (RS), Soybean-Soybean (SS). The soil bulk density was the lowest RM treatment, and soil pH was a tendency to be lower in all treatments of the paddy-upland rotation cropping system. RM treatment showed a higher moisture content and lower Electrical conductivity than RR treatment. Results of maize productivity in paddy-upland rotation cropping system, Except for the stem diameter growth, RM treatment showed good growth and productivity than MM treatment. Soybean growth and yield increased in the rotated upland cultivation from rice-paddy field compared to the SS treatment. But, overall treatments indicated poor growth and yield. In this study, we offer the effects of paddyupland rotation cropping system on the soil properties and upland crop growth and yield, and also out results can be provide supporting basic data that introduced paddy-upland rotation in reclaimed tidal land.

논에서 이앙시기에 따른 화본과와 사초과 잡초의 발생 양상을 확인하고 벼에 대한 피해 정도를 알아 보기 위해서 벼 이앙기를 4월 30일부터 6월 19일까지 10일 간격으로 달리하여 이앙 한 후 5월 20일부 터 잡초발생과 벼의 생육을 확인하였다. 잡초들의 발생본수는 화본과와 사초과 잡초 모두 1차와 2차 이 앙시기에 이앙한 시험구에서 발생본수가 많았으며, 크게 1, 2차 이앙구와 3, 4, 5, 6차 이앙시기 두 개 의 그룹으로 나누어지는 결과를 보였다. 개체 당 건물중이 비교적 큰 피는 7월까지는 조기 이앙한 경우 건물중이 큰 값을 보였으나 8월 이후에는 만기 이앙한 시험구에서 건물중이 더 큰 값을 보였다. 반면 사초과 잡초는 지속적으로 빨리 이앙한 경우가 늦게 이앙한 경우보다 건물중이 높은 값을 보였다. 논의 써레질 시기가 빨라짐에 따라 조기에 잡초가 발생하고 높은 잡초생장률을 보이며 잡초의 경합력이 커져 벼의 생육과 수량이 줄어들었다. 잡초생장율을 기준으로 볼 때 화본과는 사초과 잡초에 비해 출수기 이 후에 미치는 영향이 큰 것으로 확인되었다.

Water dropwort(Oenanthe javanica) is grown usually in submerged paddy field and is widely used as additive in foods like Kimchi, fish soup. However, its cultivation in the under submerged cultivation has been known to cause the reduction in quality of water dropwort plants mainly due to the presence of dirt and some parasites like leeches and water animals. Thus, this study was conducted to evaluate a wetland cultivation(WLC) of water dropwort plants compared to the conventional submerged cultivation(SBC) in the greenhouse paddy field conditions. WLC and SBC treatments maintained water levels to the depth of less than 5cm and about 20cm, respectively. Vegetative stem sections were planted in September and plants were harvested in early April. The results showed that height and yield of water dropwort plants were higher in SBC than in WLC. Total yield per 10a in WLC was 12.3% lower than in SBC (2.34 vs 2.63 tons). However, the useful quality factors such as vitamin C, inorganic nutrients, chlorophyll, and anthocyanin contents were found to be considerably higher in WLC. That is Ca, K, Mg, and anthocyanin contents in the stem were increased 235%, 6%, 143% and 290%, respectively, compared to those of SBC plants. The length of underground internodes from WLC elongated about 2 times more than that of SBC, resulting in an increase in plant length and advance in harvest time. On the other hand, water dropwort plants with wetland cultivation can be produced with good cleanliness and quality, but the cultivation system should be optimized and developed to get more yield the same as SBC.

The aim of this study was to assess the interaction between Daphnia similis and various organisms related to the rice paddy ecosystem. We selected several organisms that are likely to prey on D. similis and evaluate predation rate as well as responses of D. similis to the chemical compounds exuded by these organisms. As a result of predation experiment, larval dragonfly (Anax parthenope) and Triops longicaudatus were clearly shown decreasing abundances of D. similis. Especially, Triops longicaudatus was observed higher feeding rates on D. similis than larval dragonfly. Chemical compounds from the vertebrates such as fish (Misgurnus anguillicaudatus, Pseudorasbora parva, Micropterus salmoides) and tadpole of frog (Rana nigromaculata) did not affect the life history of Daphnia. However, a potential predatory fish P. parva induced significantly longer tail spine in Daphnia. In addition, among the invertebrates (T. longicaudatus, A. Parthenope, Micronecta spp., Palaemon paucidens), chemical compounds exuded by T. longicaudatus induced shorter body and significantly longer tail spine in D. similis.

본 실험은 논 토양에서 사일리지용 수수 × 수수 교잡종 재배시 화학비료와 발효 돈분 액비 혼용 시용이 생육특성 및 영양성분에 미치는 영향을 조사하고자 실시하였다. 실 험설계는 화학비료 100% 처리구 (C), 화학비료 70% + 돈분 액비 30% 처리구 (T1), 화학비료 50% + 돈분액비 50% 처 리구 (T2), 화학비료 30% + 돈분액비 70% 처리구 (T3) 그리 고 돈분액비 100% 처리구 (T4)로 한, 5처리 3반복 난괴법 으로 배치하였다. 이때 돈분 액비 시용은 질소량만을 기준 으로 하였다 (150 kg/ha). 초장, 엽장, 엽폭 그리고 경의 굵 기는 T4구가 유의적으로 작게 나타났다 (p<0.05). 경의 경 도는 돈분액비 시용 비율 낮고 화학비료 시용 비율이 높을 수록 유의적으로 증가하였다 (p<0.05). 생초수량은 T2구가 높았던 반면 T3구가 낮게 나타났다 (p<0.05). 그러나 건물 수량 및 TDN 수량은 처리구들 간에 유의적인 차이를 보이 지 않았다. 조단백질 함량은 T1구가 다른 구에 비하여 높 게 나타났다 (p<0.05). 조지방 함량은 T1, T2, T3 그리고 T4 처리구들 간에는 유의적인 차이가 없었지만, C구와는 유의적인 차이를 보였다 (p<0.05). NDF와 조섬유 함량은 각각 T3구와 C구에서 높게 나타났다 (p<0.05). 그러나 ADF 함량은 처리구들 사이에 유의적인 차이를 보이지 않았다. 총무기물 함량은 T1 > T2 > T4 > T3 > C 구 순으로 높게 나 타났다 (p<0.05). 유리당 함량은 T1과 C구가 다른 처리구에 비하여 유의적으로 높게 나타났다 (p<0.05). 이상의 결과를 종합해 볼 때, 돈분액비 시용은 화학비료에 비하여 수량성, 영양성분에 크게 떨어지지 않기 때문에 사일지용 수수 × 수수 교잡종 재배시 돈분액비와 화학비료를 혼용 시용 하 거나 돈분액비 만 시용하여도 큰 무리가 없는 것으로 판단된다.

단간 내도복성 ‘소담찰’ 수수의 논 재배 시 안정적인 수량확보를 위해 파종시기 및 재식거리에 따른 생육 특성과 종실생산성에 대한 시험을 2014년 경기도 수원의 국립식량과학원시험포장에서 수행한 결과를 요약하면 다음과 같다. 1. 출수기는 6월 10일 파종에서 62일로 가장 빨랐으며, 비닐피복재배에서 파종기가 늦을수록 출수기가 빨라지는 경향이뚜렷하였다. 2. 파종기에 따라서는 6월 20일 파종에서 생육이 급격히 감소하였고 간경, 분지수, 천립중에서 유의적인 차이를 보였고,피복유무에 따른 간장, 간경, 분지수에서도 유의성을 보였다. 3. 주당종실중과 종실수량은 파종기별 비닐피복재배에서는유의적인 차이가 인정되지 않았으나 무피복재배에서는 6월 20일 파종에서 주당종실중이 17.7g, 종실수량이 212 kg/10a으로가장 적었으며, 파종기 간에 유의적인 차이를 보였다. 4. 소담찰 수수는 간장이 평균 90 cm로 매우 작아 논 재배에서 문제가 되는 도복에 강한 경향을 보였으며, 이삭길이는소식재배에서 길어지는 경향을 보였고 간장, 간경, 분지수, 이삭길이, 천립중은 재식밀도 간에 유의성을 보이지 않았다. 5. 주당종실중과 종실수량은 재식밀도 간에 유의한 영향을주지 않았으나 주당종실중은 60×25cm (6,600본/10a)의 소식재배에서 48.0 g으로 가장 많았으며, 10a당 종실수량은 60 × 15 cm(1본)과 60 × 30 cm(2본)의 밀식재배에서 각각 427 kg, 415 kg으로 가장 증수되어 소담찰은 밀식적응성이 높은 경향이었다. 6. 따라서 소담찰 수수는 기계수확 등 생력기술을 적용하여논 대면적 재배를 위해 파종기는 6월 10일, 재식밀도는11,000주/10 a [60 × 15 cm(1본), 60 × 30 cm (2본)가 유리한 것으로 판단된다.

Occurrence characterization of oriental corn borer, Ostrinia furnacalis, in a paddy-upland rotation field for 8 maize and 7 sorghum varieties was surveyed. In a monitoring study using a pheromone trap carried out from 15 May to 10 September, the density of O. furncalis adults increased rapidly from about 2 weeks after corn planting and reached the highest density at mid June. After that, their density was decreased and increased a little at earlier September. In a survey carried out at harvest period using 8 corn varieties, the damage ratio was Daehakchal (94%), Mibaek 2 (92%), Ilmichal (71%), Eolrukchal 1 (64%), Chalok 4 (54%), Miheukchal (52%), Heugjeom 2 (45%). The number of invasive pore per Ilmichal stem by O. furnacalis larvae was 1.4 and those of the others was less than 1.0. In another survey carried out at harvest period using 7 sorghum varieties, their damage ratios were DS-202 (95%), Moktaksusu (76%), Sodamchal (75%), Nampungchal (67%), Anzunbaengisusu (57%), Donganme (46%), and Hwanggeumchal (34%). The damage of sorghum varieties was much higher and severer than that of corn by O. furnacalis larvae. These results may be useful for the establishment of a management strategy to control oriental corn borer in paddy-upland rotation fields for maize and sorghum.