GA25, 50ppm과 BA100, 200ppm을 옥수수 종자(種子)에 처리(處理)하여 발아율(發芽率) 및 호흡량(呼吸量)과 배유양분(胚乳養分)인 환원당(還元糖), 전당(全糖), 조단백질(粗蛋白質)의 이동(移動)에 대(對)하여 구명(究明)하고자 행(行)한 실험(實驗)에서 다음과 같은 결론(結論)을 얻었다. 1. 초기(初期)의 발아율(發芽率)은 GA 25ppm구(區)가 가장 높았고 BA 200ppm구(區)가 가장 낮았다. 중후기(中後期)의 발아율(發芽率)은 각(各) 처리구간(處理區間)의 차(差)가 크게 인정(認定)되지 않았다. 2. 호흡량(呼吸量)은 각구(各區) 공(共)히 발아(發芽)와 병행하여 현저히 증가(增加)되었으나 처리구(處理區)가 Control에 비(比)해 Q 가 낮고 특히 BA 200ppm구(區)가 현저하게 낮은 경향(傾向)임을 알수 있었다. 3. 배(胚)와 배유중(胚乳中)의 환원당(還元糖)과 전당(全糖)의 양(量)은 각구(各區) 공(共)히 경시적(經時的)으로 현저히 증가(增加)되나 BA 처리구(處理區)가 무처리구(無處理區)와 GA처리구(處理區)에 비(比)하여 증가율(增加率)이 낮음을 인정(認定)할 수 있었다. 4. 발아중(發芽中) 종자(種子)의 조단백질량(粗蛋白質量)은 각구(各區) 공(共)히 경시적(經時的)으로 배부(胚部)에서는 증가(增加)되고 배유부(胚乳部)에서는 감소(減少)되며 그 정도(程度)는 GA 25pppm 처리구(處理區)가 가장 현저하고 BA 200ppm처리구(處理區)의 소장(消長)이 가장 적었다.

Sorghum cv. Pioneer 93 1, sorghum-sudangrass hybrid cv. Sioux and maize plant cv. Blizzard were assayed for toxic concentrations of nitrate-nitrogen (NO3-N) and their relationship to morphological characteristics and environmental temperature in a fiel

옥수수 F1잡종(雜種)을 격잡재배(隔雜栽培)하여 채종(採種)한 종자(種子)(F2)를 사료용(飼料用)으로 재배(栽培)할 때 수량감소(收量減少)와 재식수수(栽植株數)에 의한 F2 수량보상(收量補償) 가능성(可能性)을 검토(檢討)하기 위하여 수원(水原)19호(號)와 보주옥(普州玉)으로 재식거잡(栽植距雜) 60×20, 60×16, 60×12cm로 1985. 4. 30 파종(播種)하여 축산시험장(畜

옥수수 식물체에 녹병 (Puccinia sorghi)이 감염된 상태와 비감영상태하에서 Peroxidase(Px) activity(활동)를 좌우하는 견전인자의 행동을 규명하기 위해 5개의 선발된 자식계통과 이들사이에 가능한 10개의 (잡종 제일세대)을 갖고 Px의 활동에 관한 유전분석 시험을 실시해 본 결과 다음의 결론을 얻었다. 1. 이용한 5개 자식계통과 10개의 사이의 Px활동은 크게 달랐다. 2. 수개의 유전인자에 의해서 좌우되는 일반저항성정도 와 Px활동은 일치되지 않았다. 상가적 유전인자에 의해 좌우되는 높은 일반저항성 계통 CM105는 높은Px의 활동을 보였으나, 다른 저항성계통 Oh545는 낮은 Px의 활동을 보였다. 3. 녹병감염과 비감염상태하에서의 Px의 활동은 수병균접종후 2일때는 차이가 없었으나 접종후 8일때는 감염식물체에서 유의차를 보이는 높은 Px활동이 측정되었다. 4. 옥수수에 있어서 Px의 활동을 좌우하는 유전인자는 상가적작용을 주로 일으키는 GCA(일반조합능력)효과에 의하고, 비상가유전인자에 의한 SCA(특수조합능력)효과는 비교적 낮았다. 5. 우성 단인자 저항성에 의해서 좌우되는 특수저항성 유전인자 보유한 식물체는 저항성 유전인자를 보유하지 않는 이병성 식물체에 비해서 높은 Px의 활동을 보였다. 이는 12개의 밝혀진 Px중 주로 와 의 증가에 기인한다. 6. 본 시험에서 얻어진 옥수수의 녹병저항성과 관련한 Px의 활동은 단 특수성저항성 유전인자인 경우에만 타 작물에서 얻은 시험결과와 유사한 점이 있다.

Soil conservation management is necessary for sustainable agriculture, in highland areas, and cover crops are one of the best soil conservation methods for slopes. In this study, we evaluated the effects of alfalfa cultivation on maize production, as well as soil conservation and quality. There was an outstanding soil conservation effect with alfalfa cultivation in the fallow and maize growing seasons. In particular, alfalfa cultivation reduced soil loss by up to 98% compared with bare field. It also increased the activities of soil microorganisms and the supply of organic matter. Maize production with alfalfa cultivation showed no significant differences in yield. In conclusion, alfalfa is an advantageous perennial cover crop in highland agricultural slope areas, which can have positive effects on soil quality and conservation, as well as maize production.

The purpose of this study was to evaluate the mixed treatment of compost tea and amino acid liquid fertilizer as a substitute of oil cake for the organic cultivation of maize in Goesan, Chungbuk province. As a result, nitrogen, phosphoric acid, potassium, calcium and magnesium contents of each organic fertilizer were in the order of oil cake > amino acid fertilizer > compost tea. Each of these organic fertilizers had little influence on the change of soil chemical. Individual treatment of amino acid fertilizer and oil cake for weight of an ear as well as all individual treatments for the fresh weight of 100 kernels showed significant increase, compared to the untreated control. For the corn yield of merchantable quality, each treatment of compost tea, amino acid liquid fertilizer and oil cake increased higher 3.9, 5.4 and 5.9% than untreated control, respectively. On the other hand, as a result of mixed treatment of amino acid fertilizer and compost tea, the change of soil chemical property was insignificant. The mixed treatment, Nonetheless, showed significant increase for stem height to 1st ear, grain setting length in an ear, weight of an ear, and fresh weight of 100 kernels, compared to the oil cake as a control. After all, the corn yield of merchantable quality produced by the mixed treatment was 3.9% higher than the control. Therefore, our study would be considered that the mixed treatment of amino acid and compost tea is one of organic materials that can replace oil-cake in maize.

Background: Dazomet are widely used as soil fumigant to solve soilborne problems, and the degradation intermediates are toxic to nematodes, fungi, bacteria, insects and weeds. Methods and Results: The effects of cultivation of green manure crop, maize before and after soil fumigation on the control of ginseng root rot disease were compared using soil where 6-years-old ginseng was harvested. Fumigant (dazomet) were used for soil fumigation in May and September, respectively. Maize was grown for soil management before and after soil fumigation. After May fumigation, the sowing date of maize was delayed by 15 days and thus its dry weight was decreased significantly. Maize cultivation after May fumigation increased pH but decreased EC, NO3, P2O5, and K significantly. Maize cultivation after May fumigation decreased fungi population and the ratio of fungi and bacteria. Growth of 2-years-old ginseng was improved and the incidence of ginseng root rot was significantly decreased by maize cultivation after May fumigation. After harvesting 2-years-old ginseng, the population of Cylindrocarpon destructans was not different between treatment of May and September, but Fusarium solani showed a significant increase in September fumigation after maize cultivation. Conclusions: Maize cultivation after soil fumigation was effective in inhibiting ginseng root rot by the amendment of mineral composition and microorganism in fumigated soil.

A total of 15 different corn hybrids, Kwangpyeongok, Gangdaok, Yanganok, Singwangok, Jangdaok, Cheonganok, Cheongdaok, Andaok, Dapyeongok, Pyeongkangok, Pyeonganok, Daanok, Sunwon 184, Gangilok, and P3394 was used to investigate the growth and yield depending on the sowing date. The sowing dates were April 5, June 25, and July 5 and each experiments was performed in triplicste. The growth of Gangdaok was the highest. However, although the growth of Kwangpyeongok, was lower thanthar of Gangdaok, its stem height to ear height ratio was lower than that of Gangdaok, thus , Kwangpyeongok may be more suitable for stable cultivation. Both growth and yield of Daanok were low, regardless of planting date, but yield and ear shape of Pyeongkangok and Dapyeongok were for fresh corn. Growth and yield of the 15 different corn hybrids varied depending on the planting date, However, the growth degree days (GDD) was the most important factor governing the maturity of corn. More than 1500°C of GDD was sufficient to harvest mature corn hybrids in the central region of Korea. Besides yield and growth, other characteristics, such as sweetness and taste of the hybrids, should be investigated further the selection of the best corn hybrid.