본 연구는 생태형을 달리한 사료용 피를 이용해서 파종 기를 5월 1일부터 10일 간격으로 6회 파종하여 생육, 사료 수량 및 사료가치를 경기도 수원 지방에서 검토한 내용은 다음과 같다. 조생종 피의 초장은 파종기가 늦어질수록 작 아졌고, 수장은 파종기에 따른 변화가 크지 않았다. 조생종 피의 조사료 건물수량은 파종기가 늦어질수록 감소하는 경 향을 나타냈다. 중부지방에서 조생종 피의 최대 건물수량 을 얻기 위해서는 5월 1일까지는 파종기를 빨리하는 것이 유리하며, 안전한 조사료 수량을 얻기 위해서는 6월 1일 이전에 파종해야 하는 것으로 나타났다. 만생종 피의 초장 은 파종기가 빠르거나, 너무 늦어지면 짧아지는 경향을 보 였고, 수장 역시 초장과 같은 경향을 보였다. 만생종 피의 조사료 건물수량은 파종기가 빠르거나, 너무 늦은 경우 감 소하는 결과를 보였다. 따라서 만생종의 경우에 최대수량 을 얻기 위해서는 5월 21일경에 파종을 하고, 안정된 수량 을 얻기 위해서는 6월 1일 이전에 파종을 해야 한다. 조생 종 피는 빨리 파종할수록 조사료 수량이 높아지고, 만생종 피는 5월 21일경에 파종할 때 가장 수량이 높아 두 생태형 간의 차이를 보였으나, 절대적 수량은 만생종 피가 어느 파종기에서나 조생종 피에 비해 수량이 높아 실제 재배적 측면에서는 만생종 피를 선택하는 것이 유리한 것으로 나 타났다. 조생종 피의 조단백 함량은 파종기가 늦을수록 증 가하는 경향이었으나, ADF 함량과 NDF 함량은 파종기의 차이에 따른 변화가 적었다. 만생종 피의 조단백 함량도 파종기가 늦어질수록 증가하였으며 ADF 함량과 NDF 함량 의 경우에는 조생종 피의 경우와 같은 경향을 보였다. TDN 수량은 조사료 건물수량과 동일한 경향을 보여 조생 종 피는 파종기가 빠를수록, 만생종 피는 5월 21일경의 파종에서 가장 수량이 높아 적정 파종기로 판단되며, 두 생 태형 모두 6월 1일 이전까지는 파종을 해야 안정적 수량을 얻을 수 있다. 동계 조사료작물을 도입한 작부체계에서는 동계작물의 종류에 따라 연중 최대생산을 얻을 수 있는 하 계 사료피의 생태형과 파종기를 선택해야 할 것이다. 따라 서 이러한 하계사료피+동계사료작물의 작부체계 구축에 파종기별 사료피의 수량성과 사료품질 특성은 유용한 정보 가 될 수 있을 것이다.

참깨 종자의 발아율 향상 및 초기생육 촉진을 위한 priming 처리의 적정 조건을 구명하기 위하여 priming 약제 및 농도,priming 기간과 온도 및 priming후 저온 및 고온에서의 발아율에 대한 실험 결과에서 참깨 종자의 Priming에 가장 효과적인 약제는 PEG 6000, 농도는 −0.75MPa이었으며, priming처리 기간은 15에서 4일 처리하는 것이 가장 효과 적이었다.참깨 종자의 priming처리가 최종 발아율 향상에는 크게 기여하지 못했지만 초기 발아율 향상 및 T50 단축에 효과 적이었다. 참깨 종자의 Priming처리는 20oC 이상 보다는 15oC 저온에서 T50 단축에 효과적이었고, 발아율도 향상되어 재배적온보다는 저온하에서 Priming 효과가 극대화 될 것으로 판단된다. Priming 처리 후 건조 온도 조건에 따른 발아율에는 차이가 없어 25oC에서 3시간 정도 건조 시키는 것이 가장 경제적이었다.

투수성이 높은 토양에 대한 동전기세정 제염의 영향을 평가했다. 실험토양은 많은 모래를 함유하여 수리전도도가 높은 연구 원자로 주변부지로부터 채취했다. 세정용액의 방출속도는 제염시간 경과와 함께 감소했다. 시트릭산을 사용했을 때, 세정용액의 방출속도는 78.7 ml/day로 가장 빨랐다. 세정용액으로 초산을 사용하였을 때, 토양으로부터 코발트와 세슘의 제거효율은 가장 높은 값인 95.2%와 84.2%를 나타냈다. 동전기제염 시 발생된 토양 폐액부피는 토양세척제염시보다 1/20으로 감소했다. 반면에 동전기세정방법은 토양으로부터 코발트와 세슘 제거효율을 동전기방법 보다 각각 6%와 2%로 향상시켰다. 그러므로 동전기세정방법은 투수성이 높은 토양제염 시 좀 더 효과적이다.

A field experiment was conducted to evaluate the varietal variation of Se concentration and to determine the effects of selenium foliar applications on the productivity and agronomic characteristics of the whole-crop barleys. Se fertilizer was foliar applied at five levels(0, 50, 100, 200, 400 ppm) and two forms (sodium selenite and sodium selenate solution) at stem elongation stage, the middle of April. Cultivar effects on whole-plant Se contents were small and not significant. Regardless treatments, there were no remarkable effects on dry matter yield and forage quality of whole crop barleys. Se contents of plant was higher in selenate application by 3~10 times than selenite. In selenate treatments, as Se levels were raised from 50 ppm to 400ppm the Se contents were increased from 331ppb to 3433ppb and Se contents were positively correlated with the rate of Se application levels. Selenium(Se) is an essential nutritional trace element, which is needed for growth and reproduction in all living animals. But the line between the requirement and harmfulness of Se is narrow since selenium is a highly toxic element. The level of Se in feeds of plant varies depending on plant species, growing season and soil which the plants grow on. Because of low concentration of Se in domestic soils, the selenium availability to plants is limited and it is necessary to supplement feed with selenium. Generally organic Se is less toxic and more efficiently utilized than inorganic Se. Under the condition that antibiotics use in feed are prohibited, selenium enriched whole-crop barley can be one way to improve animal health.

These experiments were conducted to get high production and quality of whole crop winter cereals, Oat, Wheat and Triticale, in the paddy field. These three whole crop winter cereals are got later harvest than whole crop barley, so there are more production of forage. Its harvest time was the end of May or the early of June in the south area of Korea. Mixed cultivations of Oat and Wheat (MCOW) was got more production over 15 percents in the dry wight, and then contents of crude protein (CP) in MCOW were higher than single cultivation of Oat. And Relative feed values (RFV) of MCOW were higher than single cultivation of Oat. Mixed cultivations of Oat and Triticale (MCOT) were got more production over 7 percents in the dry wight than single cultivations of Oat, but contents of CP in MCOT were not changed in all plots. And RFVs of MCOT were higher than single cultivations of Oat.

These experiments was carried out to get high quality of forage to cultivate mixed barley and winter pea with different seeding rates, 200 and 140 kg/ha in barley, and seeding rates in winter pea were 0, 50 and 100 kg/ha. And these were tested in Iksan from 2006 to 2007 for two years. The results were followed. Dry weight in only barley seeding of 200 kg/ha was 0.9 ton/ha higher than only barley seeding of 140 kg/ha. Fresh and dry weight in barley seeding of 200 kg/ha and mixed winter pea were each 1.4, 0.7 ton/ha higher than barley seeding of 140 kg/ha and mixed winter pea. And crude protein in barley seeding of 200 kg/ha and mixed winter pea was from 0.3 to 0.8 %, and 140 kg/ha and mixed winter pea was from 1 to 1.6 %. The rates of fresh and dry weight to all yield in winter pea were each from 8 to 15, from 4 to 21 % in barley seeding of 200 kg/ha and mixed winter pea, and were from 9 to 20, from 5 to 26 % in barley seeding of 140 kg/ha and mixed winter pea.

This study was carried out to determine adequate planting date, to compare the growth characteristics between early and late maturing cultivars, and to provide the data for the cultivation techniques of soybean [Glycine max (L.) Merr.] in double cropping system with winter crops on paddy field in Korea. Cultivars were planted on 26 May, 16 June, and 7 July with a planting density of 70cm(row~;widtb)~;~times~;10cm (planting spacing). Seed yield of soybean planted on June 16 and July 7 was approximately 37~%~;and~;53~% , respectively, less than that of conventional planting date of May 26 in Pungsan-namulkong, and planted on June 16 and July 7 was about 30~%~;and~;37~% , respectively, less then that of conventional planting date of May 26 in Hanamkong. The number of pods and seeds per plant decreased as planting date delayed. Seed weight increased in Pungsan-namulkong but decreased in Hannamkong as planting date delayed. The flowering date was late in delayed planting plots, but it was shorted for days from emergence to flowering and from emergence to maturity. The plant height of Hannamkong was greater than Pungsan-namulkong from the emergence to flowering stages, but in contrast, it was greater in Pungsan-namulkong than Hannamkong after flowering stage (50d after emergence) when it planted on May 26. There were no significant differences between two soybean cultivars at planting dates of June 16 and July 7. Leaf number, leaf area, and dry matter were also reduced by late planting, and Both of them were shown in high reduction at the later planting. There was a high significant difference at the flowering (r~;=~;0.87**) and pod formation (r~;=~;0.91**) stages between leaf dry matter and seed yield. Crop growth rate (CGR) was greater at R2~~R3 growth stages compared to R3~~R4~;or~;R4~~R5 growth stages in two soybean cultivars and the greatest CGR was obtained at planting date of May 26 in two soybean cultivars except for R4-R5 growth stage in Pungsan-namulkong. There was a highly significant positive difference between the seed yield and the leaf area index (LAI) across R3 to R4 and R2 to R3 stages. The photosynthetic rate (PN) of the uppermost leaf position had no significant difference among planting dates and between two soybean cultivars. However, PN of the 7th leaf position increased as the planting date delayed.

This experiment was carried out at paddy field (commercial silty loam soil) in the southwestern Korea. Pungsannamulkong, a determinate growth habit, was a relatively high yielding and late maturing cultivar, and Han­namkong, a semi determinate growth habit, was a relatively low yielding and early maturing cultivar. Seeds were sowed at two plants and with a planting density of 70~times10cm on May 26, 2003. Fertilizer was applied prior to planting at a rate of 3.0-3.0-3.4g (N-P2O5-K2O)~;per~;m2 by all basal fertilizations. Experimental design was a randomized complete block with three replications. Seed yield was higher in Pungsannamulkong by 362g per m2 than in Hannamkong of 260g per m2 Also, the number of pod, number of seed, and number of seed per pod were greater in Pungsannamulkong than in Hannamkong. The number of leaves per m2 showed similar with two soybean cultivars up to August 24 but thereafter it decreased in Hannamkong. The leaf area up to August 4 increased in Hannamkong higher than in Pungsannamulkong, but after that time, Pungsannamulkong had greater leaf area than Hannamkong. The shoot and leaf dry matter of two soybean cultivars from June 23 to August 4 were similar but thereafter, Pungsannamulkong had a significantly greater than Hannamkong. Crop growth rate (CGR), relative growth rate (RGR) and net assimilate rate (NAR) for Punsannamulkong were relatively higher than Hannamkong but leaf area ratio (LAR) and specific leaf weight (SLW) showed higher in Hannamkong. Most of leaves distributed in the ranges of 80-90cm and 60-70cm from the soil surface in Punsannamulkong and Hannamkong, respectively. Pods of Punsannamulkong ranged 10-80cm from the soil surface and most of pods were distributed at 40-50cm. Photosynthetic rate at the flowering stage showed a significant difference between cultivars in the upper most leaf position. There was no significant difference of the photosynthetic rate at 7tn leaf at the flowering stage, and the uppermost and 7th leaf position at the seed development stage between two soybean cultivars.

Field studies were conducted in the southeastern Korea (36~circ N) on a commerce silt loam soil at paddy field. Seed were manually planted on 16 July 2003. Plants were planted with plant densities of 70~times 10 cm (row width x plant spacing), 50 x 10 cm, and 30 ~times 10 cm. Two seedlings per hill were taken prior to V3 stage. Fertilizer was applied prior to plant at a rate of 30-30-34 kg (N-~textrmP2~textrmO5 -~textrmK2~textrmO ) per ha. Experimental design was a randomized complete block in a split plot arrangement with three replications. Yield from different planting densities responded similarly in three soybean cultivars and increased when planting density increased. Somyeongkong showed the highest increasing rate of yield about 26% by 338 g ~textrmm-2 at 30 x l0 cm compared to yield of conventional planting density (70 x 10 cm). Also, the planting density significantly affected pod and seed number and seed weight, but not seed per pod. The tallest plant appeared at 30~times 10 cm. The change of leaf area according to days after emergence showed differently in soybean cultivars. The highest and lowest total dry matter production per square meter appeared at 30 x 10 cm and at 70 x 10 cm, respectively. Crop growth rate (CGR) showed greater at R3∼R4 stages compared with V7∼R2 or R2∼R3 growth stages and showed the greatest at 30 x 10 cm in three soybean cultivars. As late planted soybean, there was a significant relation between seed yield and CGR, and leaf area index (LAI) according to planting densities at before and after the flowering stage. Relationship between seed yield and CGR in three planting densities showed a highly significant positive relation (~textrmR2 =0.757) at R3 to R4 stages, and significant relations (~textrmR2 =0.505, 0.617) at V7 to R2 and V2 to V3. Also, there was a highly significant positive difference between seed yield and LAI during R3 to R4 and R2 to R3 stages.

This study was conducted to determine the effects of two plant populations (28 and 14 plants per m2 ) and two toppings in conventional plant population (28 plants per m2 ) on soybean (Glycine max L. cv. Pungsannamulkong) cultivated in the paddy field. The two topping time were taken at 6th to 7th and 8th to 9th trifoliolate leaf stages in the conventional plant population. Experimental design for growth data was a randomized complete block with three replications, and samples were taken at R1 (July 31), R3 (August 19), R5 (September 2) and R7 (September 23) growth stages. The branch number of soybean was relatively higher in the low plant population (14 plants per m2 ) and with the topping at the 6th to 7th leaf stage, in the conventional plant population (28 plants per m2 ), and with topping at the 8th to 9th trifoliolate leaf stage in descending order. The highest average branch length of soybean was observed in the low population and the longest branch length was observed from the soybean with topping at the 6th to 7th leaf stage. The leaf number per plant was decreased in order of in the low population, with the topping at 6th to 7th trifoliolate leaf stage, with the topping at 8th to 9th trifoliolate leaf stage, and in the conventional population. The leaf area was high in the low population and with topping at 6th to 7th trifoliolate leaf stage and was relatively low in the conventional population and with the topping at 8th to 9th trifoliolate leaf stage in soybean. The dry weight of leaves and branches was high in the low population and with the topping at 6th to 7th trifoliolate leaf stage and was relatively low in the conventional population and with topping at 8th to 9th trifoliolate leaf stage. The leaf number per plant was high in the low population and with topping at 6th to 7th trifoliolate leaf stage and was relatively low in the conventional population and with topping at 8th to 9th trifoliolate leaf stage. The grain yield per 10a was high with the topping at 6th to 7th trifoliolate leaf stage.