최근 안전한 먹거리에 대한 관심 제고와 고품질 대추 생산에 대한 관심 급증으로 친환경적인 해충방제법의 필요성이 높아지고 있다. 친환경적 해충방제를 위하여 비가림하우스 별 방충망을 설치하여 해충방제 효과와 과실 생육을 조사하였다. 시험에 사용된 방충방 규격은 각각 25, 18, 6mesh로 대추나무잎혹파리, 장님노린재, 복숭아심식나 방의 차단효과를 보았다. 대추나무잎혹파리의 경우 피해엽율이 1.2%, 10.8%, 14.3%, 무처리구는 15%였으며 장님노린 재의 경우 피해눈율이 6.9%, 5.8%, 20.41%, 28.2%였고, 심식나방은 피해과율이 0.0%, 1.0%, 0.0%, 32.0%로 나타났다. 방충망처리에 따른 대추생육은 처리구와 무처리구에서 차이가 거의 없었다. 대추재배농가의 방충망 도입이 해충 방제에 효과가 큰 것으로 판단되며 문제가 되고 있는 세가지 해충을 모두 방제하기 위해서는 25mesh로 처리하는 것이 가장 효과적인 것으로 판단된다.

Background: Recently, jujube (Zizyphus jujuba Mill.) has been attracting attention as a fruit, and its cultivation in rain shelter house is increasing to produce the high quality fresh jujube. This study was carried out to investigate the growth and fruit characteristics of jujube according to the types of rain shelter house. Methods and Results: The characteristics of 5-year-old Bokjo cultivar cultivated in 3 types of rain shelter house, multi span rain shelter house with roof vent (Type I), single span house with a column in the center and roof vent (Type II) and single span house with a column in the center and without roof vent (Type III), and open field were examined. The sprouting and blooming period were different among the types of rain shelter house. The diameter of main stem was higher in rain shelter houses than in the open field. There was no a significant difference in fruit number per leaf stem among the types of cultivation. The incidence of fruit cracking in open field cultivation which was 51.2% was much higher than that in Type I 21.6%, Type II 19.3%, and Type III 25.5%. The fruit size and weight in rain shelter houses, especially in Type III rain shelter house were higher than those in the open field and the soluble solids content of fruit in Type I and Type II was higher than in Type III rain shelter house and the open field. Conclusions: The results show that the growth and fruit quality of jujube were improved by cultivation in rain shelter house, and affected by the types of rain shelter house.

A new rose variety, ‘Venus Berry’ was selected from the progenies of a cross between ‘Boy Friend’ and ‘GSR10315’ by rose breeding team of the Gyeonggi-Do Agricultural Research and Extension Services(GARES) in 2011. ‘Venus Berry’ was crossed in 2007 and seedlings were produced. After the test of specific characters from 2008 to 2011, it was finally selected and named. ‘Venus Berry’ was developed because of distinctive characters such as growth uniformity and high yielding potential. The petal of flower is so thick and has no scratch. A standard type with large sized flower, it has light pink(Red Purple Group 69C) color flower. ‘Venus Berry’ takes 45 days from pruning to blooming and cut flower productivity was 194.1 stems/m2 in a year. The length of cut flower was long with 65.5 cm. It has 10.2 cm in flower diameter and 43.6 in petal numbers per flower. Vase life of the this cultivar could be as long as 12 days.

A new rose variety, ‘Love Letter’ was selected from the progenies of a cross between ‘Red Giant’ and ‘Ensemble’ by rose breeding team of the Gyeonggi-Do Agricultural Research and Extension Services(GARES) in 2011. ‘Love Letter’ was crossed in 2007 and seedlings were produced. After the test of specific characters from 2008 to 2011, it was finally selected and named. ‘Love Letter’ was developed because of distinctive characters such as growth uniformity and high yielding potential. A standard type with large sized flower, It has red(Red Group 46A) color flower. ‘Love Letter’ takes 43 days from pruning to blooming and cut flower productivity was 152 stems/m2 in a year. The stems of cut flower have no thorn and the length was long with 70.5 cm. It has 9.3 cm in flower diameter and 32.4 in petal numbers per flower. Vase life of the this cultivar could be as long as 12 days.

In order to determine the optimum harvest time for the seed production of inbreds and hybrids in silage corn, the ears of sib-pollinated 'KS5', 'KS7rhm', and 'Ga209' and cross-pollinated 'KS5' ~times 'KS6' (Suwon19), 'KS7 rhm' ~times 'KSl17' (Suwonok), and 'Ga209' ~times 'DB544'(Kwanganok) were harvested at the one-week intervals from 4 to 10 weeks after silking. The optimum harvest time for the seed production for 'KS5', 'KS5' ~times 'KS6', 'KS7 rhm', and 'KS7rhm' ~times 'KS117' was 7 weeks after silking considering both emergence rate and plumule growth in cold test. Although earlier harvested seeds showed similar germination rate as the seeds harvested at the optimum time at 25~circC , their emergence rate were lower in cold test. Seed weight and α -amylase activity of earlier harvested seeds were lower compared to those of seeds harvested at the optimum time, while leakage of total sugars and electrolytes were higher. However, the later harvested seeds showed lower germination rates at 25~circC and emergence rates in cold test probably due to the lower α -amylase activity although they showed increased seed weight and reduced leakage of total sugars and electrolytes. In contrast, the emergence rate of 'Ga209' and 'Ga209' ~times 'DB544' in cold test increased up to 10 weeks after silking probably due to the increased seed weight and α -amylase activity and reduced sugar and electrolyte leakages during the germination. The cross-pollinated F1 hybrid seeds showed higher germination and emergence rates at 25~circC and in cold test, and higher plumule growth and α -amylase activity compared to those of sib-pollinated inbreds.

An experiment was carried out to find out the priming effects of rice seeds, Oryza sativa L. (cv. Ilpumbyeo) on. the seedling establishment and early emergence under excess soil moisture conditions. Seeds were primed by soaking in -0.6 MPa polyethylene glycol (PEG) solution at 25~circC for 4 days. The primed seeds were sown in soils with various soil moistures (60, 80, 100, 120, and 140% field capacity) at 17 and 25~circC , respectively. Germination and emergence rates, plumule height, and radicle length of primed seeds were higher than those of untreated seeds at any soil moisture and temperature examined. The time from planting to 50% germination (T50 ) of primed seeds was less than that of untreated seeds by 0.9～3.7 days. Germination rate, emergence rate, plumule height, and radicle length were highest at the soil moisture of 80% field capacity among the soil moistures. Priming effects of rice seeds on germination and emergence rates were more prominent under the unfavorable soil moistures (60, 100, 120, and 140% field capacity) than those under the optimum soil moisture condition (80% field capacity). However, priming effects on seedling growth were greater at near optimum soil moisture compared with too lower or higher soil moistures. Therefore, these findings suggest that priming of rice seeds may be a useful way for better seedling establishment under the adverse soil conditions.