잡곡 및 사료 생산 수급전망과 대책

정승근 한국작물학회 1998 한국작물학회 학술발표대회 논문집 Vol.1998 No.-

Environmental conditions and expected profit are the major criteria to select crops to be cultivated in any region. Traditionally, miscellaneous crops have been cultivated as alternative crop in case of unfavorable climate or supplementary crop in marginal lands. Since the successful breeding of high yielding varieties of staple crops and development of cultural techniques in 1970s in Korea, production of miscellaneous crops decreased markedly due to the rapid commercialization of agriculture and increased productions of horticultural crops, although yields have been doubled during the last 2~3 decades. On the other hand, animal husbandry has been developing remarkably parallel with national economic development and the increased consumption of animal products. As a result, imports of feed grains such as corn have increased rapidly, while roughage production became lower than demand. Among miscellaneous crops, corn production increased markedly through the development of hybrids and due to its importance as silage crops. Acreage of corn production including grains, fresh corns and feeding is about 120,000 ha, while acreage of buckwheat is about 5,000 ha and those of other miscellaneous crops decreased to a level of about 1,000 ha. Although miscellaneous crops have low yield potential and are unprofitable due to low price and imports of cheap foreign products, they should be kept to cultivate. Miscellaneous crops are important components that maintain diversity among upland crops as well as alternative crops in case of unfavorable climate. The low yield potential of miscellaneous crops might be due to lack of efforts to breed high yielding varieties and to develope cultural techniques. Continuous investment in research, exploitation of new utilization for miscellaneous crops as sustainable crop, honey crop and sightseeing crop, and development of healthy and special foods will promote their cultivation. Animal feeding in Korea depends mainly on formula feeds. As the number of animals increases to meet demand of animal products, there is no alternative way but to import grains to feed them. But roughage production, which is necessary for normal growth of ruminant animals, should be increased. However, lack of arable land and pasture land limits the production of good roughages. It is estimated that number of course for meat and milk production will be 2.5~2.6 million and total of 6.2~7.5 million tons of roughages should be produced. This implies that more than 1 million tons of roughage are needed, although pasture land, upland for forage crops, forage crops after rice cultivation and rice straw are utilized. Therefore, new reclamation of pasture land, increased roughage production in cultivating land, increased cultivation of forage crops after rice, more utilization of rice straw and active exploration of indigenous plant species as roughage resources should be promoted

Genotype ´ Environment Interactions of Maize Hybrids Among Temperate and Tropical Inbreds in Temporal and Spatial Environments

정승근,James L. Brewbaker 한국육종학회 2005 한국육종학회지 Vol.37 No.1

친연계수에 의한 쌀보리 품종의 유전적 다양성

정승근,박문웅 한국육종학회 2000 한국육종학회지 Vol.32 No.4

식물육종에서 유전자형 X환경 상호작용, 안정성 및 적응성의 의의와 추정방법

정승근 충북대학교 농업과학기술연구소 2010 農業科學硏究 Vol.26 No.1

Understanding the relationship between genotype(G) performance and environment(E) has long been a key issue for plant breeders and geneticists, Genotype x environment interaction(GEI) has a negative effect on heritability, therefore, significant GEI can seriously impair efforts in the selection program. Stability is the reaction of a genotype, relative to other genotypes, to different environment, while adaptability is used in the context of spatial variation. The statistical approach to stability and adaptability has the advantage of computational simplicity. Many statistics have been proposed, but unless the concept of stability and the kind of environments that are included in the experiment are clearly understood, they are of little use and may be misleading. In general, if the breeder is con-cerned about stability over an entire range of environments, partitioning components of GEI mean squares by analysis of variance is useful. If the breeder is interested in comparing relative stability among the groups of genotypes included in the experiment, regression analysis is the best. When the data do not fit or if the residual mean squares from the regression are heterogenous, nonparametic method is preferred, Although the parametric approach to stability is relatively simple. it does not pro-vide information for the resolution of any conflicting inferences between analysis of variance and regression methods. In whatever way it is done, cluster analysis allows subset of genoptypes to be described by the characteristics of the separate groups, although not directly in terms of stability. If well-known genotypes are included in the test. it can be used as a paradign for the other genotypes in the same cluster. These genotypes may be regarded as having the overall characteristics of this gen-otype and extrapolation for them to a much wider range of environments than those tested, may be possible. Graphic presentation of GEI by GGE biplot analysis may be useful to understand the rela-tionships among geniotypes or environments and stability of genotypes simultaneously.

콩 재배종과 야생종 유전자원의 엽 형질 변이

정승근,김홍식 한국육종학회 2009 한국육종학회지 Vol.41 No.1

콩 재래종과 야생종 자원의 엽 형질간의 관계를 분석하여 콩의 엽형 조사를 계량화할 수 있는 기준을 제시함으로써 콩의 초형개량과 재배법 개선을 위하여 필요한 기초자료를 제공하고자 충북대학교 농업생명환경대학 두류유전자원관리실에서 분양받은 콩 재배종 94개와 야생종 91개의 엽형질을 조사한 결과는 다음과 같다. 1. 재배종과 야생종의 엽장은 각각 12.3pm1.25 cm(8.7~15.3 cm)과 평균 6.6pm1.35 cm(3.7~11.3 cm), 엽폭은 각 Although leaf characters are important in soybean [Glycin max (L.) Merr.] breeding and development of cultural methods, very little information has been reported. The objectives of this study were to evaluate and analyze the relationships among leaf characters and suggest possible classification criteria for cultivating and wild (Glycin soja Sieb. & Zucc.) soybeans. Total of 94 cultivating and 91 wild soybean accessions from the Soybean Germplasm Laboratory of Chungbuk National University were used for this study. Central leaflet of the second leaf from the top of the plant was selected to measure leaf characters. Average leaf length, leaf width, leaf area, leaf shape index (LSI) of cultivating and wild soybeans were 12.3pm1.25 cm and 6.6pm1.35 cm, 6.8pm1.241 cm and 2.9pm0.92 cm, 55.6pm15.75 cm2 and 14.3pm7.83 cm2, and 1.9pm0.38 and 2.4pm0.53, respectively. Based on LSI, three categories of leaf shape, i.e., oval, ovate and lanceolate, were defined as LIS≤2.0, LSI 2.1~3.0 and 3.1≤LSI, respectively. Percentage of oval, ovate and lanceolate leaf types among cultivating and wild soybean accessions were 78.7%, 17.0% and 4.3 %, and 40%, 15.4% and 4.4%, respectively. Based on leaf length, three categories for cultivating, i.e. short leaf (≤11.0 cm), intermediate (11.1~13.0 cm), and long (13.1 cm≤), and four categories, i.e. short (≤5.0 cm), intermediate (5.1~7.0 cm), long (7.0~9.0 cm), and very long (9.1 cm≤) for wild soybeans were defined. Short, intermediate and long leaf types were about 1/3, 1/2 and 1/6, respectively, in cultivating soybeans, and 15.4%, 40.7% and 39.5%, plus 4.4% of very long leaf type in wild soybean. Cultivating and wild soybeans had leaf thickness, leaf area ratio (LAR), angle and petiol length of 0.25pm0.054 mm and 0.14pm0.032 mm, 40.1pm8.22 and 53.7pm12.02, 37.6pm5.89º and 54.6pm10.77º, and 23.9pm5.89 cm and 5.9pm2.33 cm, respectively. There were highly significant positive correlations between leaf length and leaf width, and negative correlation between LSI and leaf width both in cultivating and wild soybeans. Although leaf area showed significant correlations with leaf length, leaf width and LIS in cultivating soybeans, wild soybeans showed no significant relationships among these characters. In general, soybeans with oval, ovate and lanceolate leaves were significantly different in leaf width and thickness. Cultivating soybean with oval leaf had greater leaf area, while wild soybeans with oval or ovate leaf had longer petiol than with lanceolate leaf.

播種期 및 栽植密度가 단옥수수와 찰옥수수의 이삭形質에 미치는 影響

鄭丞根,許成秀 충북대학교 농업과학기술연구소 1992 農業科學硏究 Vol.10 No.1

This study was conducted to clarify the effects of planting time and planting density on ear characters in sweetcorn and waxycorn and, therefore, to provide informations necessary to improve quality and marketability of sweetcorn and waxycorn ears. Sweetcorn cultivar Goldencrossbantam 70 and a local waxycorn variety were planted on May 6 and June 26 at the planting densities of 4,000,6,50 and 9,000 plants per 10a. Plant and ear height were reduced as planting date was delayed and planting density was increased in both sweetcorn and waxyxorn. In sweetcorn, unhusked and husked ear weights were decreased about 60∼80g as planting was delayed and about 10∼20g as planting density was increased. In waxycorn, both planting date and planting density did not inf1uenced on ear weight. In sweetcorn, unhusked, husked and filled ear lengths wers reduced about 2∼4㎝ as planting date was delayed and about 1㎝ as planting denisty was increased. In waxyxorn, ear length was not affected by planting date or planting density. In both sweetcorn and waxycorn, distribution and variations of ear weight and length were smaller for husked ears than those for unhusked ears. Number of kernel rows per ear was decreased in June 26 planting, but planting density showed no influence in sweetcorn. However, both planting date and planting density did not sow any effect on row number in waxycorn.

콩 육성품종의 유전적 다양성

정승근,김홍식,손석용 한국육종학회 1999 한국육종학회지 Vol.31 No.4

조합능력검정과 회귀분석을 종합이용한 품종 x 환경의 교호작용분석법

정승근 한국육종학회 1981 한국육종학회지 Vol.13 No.3

옥수수의 生育期間 豫測을 위한 Growing Degree Days의 計算方法

정승근,이석순,박근용 한국작물학회 1986 한국작물학회지 Vol.31 No.2

除草劑를 利用한 이태리포풀러 苗圃床의 雜草防效果

鄭丞根,金洪殷,李喆求,李明煥 충북대학교 농업과학기술연구소 1989 農業科學硏究 Vol.7 No.2

This experiment was conducted to screen useful herbicides for Populus euramericana Gainer nur-sery at the Chungbuk Forestry Experiment Station in 1988. Soil surface treatment of 11 herbicides was made on May 19 after planting Populus euraneicana G. cuttings. Digitaria sanguinalis(L.) Scopp, Chenopodium album var. centrorubrum Makino, Portulaca oleracea L., Eleusine indica(L.) Gaertner and Echinochloa crusagali (L.) Beauv. var. praticola Ohwi were dominant weeds in the nursery. Among herbicides tested, alachlor G, alachlor+pendimethalin G, Metolachlor+prometryn EC and oxyfluorfen EC were effective to control both grasses and broad-leaf weeds effectively, but the falter two chemicals resulted in severe damage to Populus euramericana. The growth of cuttings measured by basal diameter and height showed no significant difference among treatments and he-rbicides except oxyfluorfen. Significant correlations were observed between weed coverage 2 weeks after herbicide treatment and number of weeds 1 month and 3 months after herbicide treatment. Also, number of weeds after 1 month was significantly correlated with that of 3 months after herbicide treatment.