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이주삼 한국낙농학회 1990 韓國酪農學會誌 Vol.12 No.4
Orchardgrass의 영년채초지에서 예취빈도에 따른 개체당 경수의 변화를 검토하였다. 1. 개체당 경수는 예취번초간에서 유의한 차이가 인정되었으나 최종예취시에는 예취구간에 유의한 차이가 인정되지 않았다. 2. 모든 예취구의 1번초와 4회와 5회 예취구의 3번초에서 개체당 경수가 많았다. 3. 상대경수출현율은 4회와 5회 예취구의 2번초와 3번초간에서 증가하였으나 하계절의 예취에 의하여 크게 감소하였다. 4. 예취시기가 다른 1번초간의 상대경수출현율은 예취시기가 늦을수록 감소하였다. 5. 개체당 경수의 변화로써 1번초의 예취시기를 추정한 결과 개체당 경수가 최고치에 달하는 5월 중순이 1번초의 예취적기로 판단되었다. Seasonal changes of number of tillers per plant by the cutting frequency were examined with orchardgrass populations in permanent meadow. The number of tillers per plant was investigated from April to October, 1989 at the experimental field of Yonsei University. Cutting frequencies were 2, 3, 4 and 5 cuttings in a year, respectively. The results are may be summarized as follows; 1. The number of tillers per plant was significant difference between cuts in each cutting, but no significant difference was found between final cuts in all cutting frequencies. 2. The number of tillers per plant was reached a peak in the 1st cut of all cuttings, and 3rd cut of 4 and 5 cuttings, respectively. 3. Relative tiller appearance rates(RTAR) increased between 2nd and 3rd cut of 4 and 5 cuttings, but decreased rapidly due to the death of many tillers after the summer harvest in 3, 4 and 5 cuttings. 4. Relative tiller appearance rates(RTAR) between 1st cuts decreased logistically up to the 1st cut was taken later at the inflorescence stage(2-1). 5. The maximum number of tillers per plant of 1st cut could be obtained at the early heading stage in the middle of May. It results may indicate that the growth season of the middle of May was an optimum time for the 1st cut.
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이주삼,정충섭,이병훈 한국축산학회 1985 한국축산학회지 Vol.27 No.3
This experiment was carried out to compare the varietal differences in regrowth capacity of three varieties of meadow fescue, basing on the data of the dry weight of a plant(DW) of the tad cutting and its related characters of the 1 st cutting. The results are summarized as follows; 1. The dry weight of a plant(DW) of the 2nd cutting showed positive significant correlations with leaf weight of a plant(LW), stem weight of a plant(SW), weight of a tiller per plant(WT), leaf area per plant(LA), stem area per plant(SA), stem thickness(ST) and the efficiency of dry matter production per leaf area(DW/LA) of the 1st cutting. 2. Specific leaf weight(SLW) and the efficiency of dry matter production per leaf area(DW/LA) at the 1st cutting became to have more influence on the increase of specific stem weight(SSW) and the efficiency of dry matter production per stem area(DW/SA) at the 2nd cutting. 3. Specific stem weight(SSW) of the 1st cutting in M variety had positive significant correlations with the number of tillers per plant(N'I~ and the dry weight of a plant(DW) of the 2nd cutting. 4. The values of the efficiency of specific stem weight on the regowth(ESSW) were 4.09, 3.60 and 2.13 in M, Leto and Bundy, respectively. 5. The relationship between the dry weight of a plant(DW) of the 2nd cutting and the efficiency of spec stem weight on the regrowth(ESSW) was non-significant correlation(r = 0.0541). But, there was negative significant correlation in M(r=-0.9197^(**)) and in Leto(r=-0.8660^*), but non-significant correlation in Bundy(r = -0.3802), respectively. 6. The efficiency of specific stem weight on the regrowth(ESSW) is an effective functional factor fox the decision of regrowth capacity of the varieties.
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Orchargrass의 식생 구조 I. 건물생산성의 경년적 변화와 형태적 , 구조적 형질과의 관계
이주삼 한국초지조사료학회 1988 한국초지조사료학회지 Vol.8 No.3
This experiment was conducted to investigate the morphological and structual characters and the dry weight of plant (DW/pl.) concerned vegetational structure of orchardgrass pastures by the times of year, from 1 year to 7 year previous, 1986 through 1980, alternately. This experiment was carried out on the experimental fields of Yonsei University. The results are summarized as follows: 1. Population density (PD) was extremely decreased by the times of year. 2. Pasture productivity was highest at 3 year old pasture, was lowest at 5 year old pasture and was recovered at 7 year old pasture. 3. Recovery of pasture productivity was followed the increase of dry weight of plant (DW/pl.) and number of tillers per plant (NT/pl.). 4. The population density of 7 year old pasture was 14 plants per square meter. 5. The number of tillers per plant (NT/pl.), dry weight of plant (DW/pl.) piant length (PL), and plant size (PS) was frequently showed the highest values by the times of established year. 6. The stubble diameter (DIA), stubble area (SB), plant size (PS), distance between neibour plant (DIS) and leaf alea index (LAI) was increased according to the times of year. 7. The dry weight of plant (DW/pl.) was positively significant correlations with the number of tillers per plant (NT/pl.) all of the established pastures, but the dry weight of a tiller (WT) was tended to increase of correlations with the dry weight of plant (DW/pl.) by the times of year. 8. Differences between morphological and structual characters was recognized according to the times of year.
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Orchardgrass 채초형초지에 있어서의 질소이용효율에 대하여;1. 건물증가량
이주삼 한국축산학회 1983 한국축산학회지 Vol.25 No.1
Intended to evaluate the efficiency of nitrogen utilization under hay-type management in this paper, based on the data of previous experiment. (Korean J. Anim. Sci. 24(4):361-369, 1982.) Average increase in dry matter production per fertilizer N which was expressed as a measure of response rate of dry matter to fertilizer N by linear regression coefficient of dry matter yield on rates of fertilized N. The results are summarized as follows; 1. Average increase in dry matter production to basal N fertilization levels increased directly as growth progressed up to the first cutting. The values of the first cutting were 11.43, 9.77 and 11.83 ㎏ DM/㎏ N for Kitamidori, Latar and S143, respectively. 2. In each regrowth stage of the second cutting were obtained 32.80 (ranged from 24.49-35.55), 32.99(22.56-43.47) and 17.74 (14.30-20.05) ㎏ DM/㎏ N for Kitamidori, Latar and S143. 3. Average increase in annual dry matter production were 16.68, 15.58 and 13.31 ㎏ DM/㎏ N in Kitamidori, Latar and S143. The highest average increase in dry matter production obtainable by fertilizer N ㎏ per annum was different between the varieties. It was 29.8 ㎏ DM at the 100 ㎏/ha level in Kitamidori, 30.2 and 20.5 ㎏ DM/㎏ N at the 200 ㎏/ha level in Latar and S143.
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이주삼,노진환,박상수,이희충,Lee, Ju-Sam,Noh, Jin-Hwan,Park, Sang-Soo,Lee, Hee-Choong 한국유기농업학회 2012 韓國有機農業學會誌 Vol.20 No.3
사육밀도를 달리 했을 때 지렁이 개체군의 생체량 증가를 위한 최적 사육밀도를 추정하려고 하였다. 실험결과를 요약하면 다음과 같다. 1. 사육밀도 S-2과 S-3에서 상대증체량, 생체중 증가율과 유기물 전환효율이 높은 값을 나타내어, 지렁이 개체군의 최대 생체량을 얻기 위한 최적 사육밀도로 추정되었다. 이를 지렁이 생체중과 먹이량의 비율로 나타내면 1:32-1:48의 범위였다. 2. 사육밀도 S-1(1:16)에서 모든 조사시기의 분립생산량이 유의하게 많았고 분립비율도 유의하게 높았다($$P{\leq_-}0.05$$). 3. 사육밀도 S-3(1:48)에서 지렁이 생체중당 난포수와 분립생산량이 가장 많았다($$P{\leq_-}0.05$$). 4. 사육밀도가 높아지고 사육기간이 길어짐에 따라 분립의 전 질소함량, 유효인산함량, 양이온치환능력(CEC) 및 양이온 함량이 증가되는 경향이었다. 5. 유기농업에서 지렁이 분립은 상토 재와 토양개량제 및 작물보호를 위한 농자재로서 잠재적 유용성은 매우 높다고 판단된다. This experiment was carried out to investigate the optimal stocking rate of earthworm populations grown under different stocking rates. The stocking rate in terms of ratio of biomass of earthworms to biomass of feeds(organic resources) is an important factors for biomass productivity of earthworms and vermicast production. The different stocking rates were 1:16(S-1), 1:32(S-2), 1:48(S-3) and 1:64(S-4), as the ratios of biomass of earthworm to biomass of organic dairy cow manure, respectively. The stocking rate of 1:32(S-2) and 1:46(S-3) were obtained a higher values on increasing rates and conversion efficiency of organic matter to earthworm biomass than other stocking rates. Thus, a stocking rates of 1:32 and 1:46 estimated an optimal stocking rates for maximum biomass productivity of earthworms. A stocking rate of 1:16(S-1) showed a significantly highest values of vermicast production and ratios of vermicasts during the rearing periods.($$P{\leq_-}0.05$$) A stocking rate of 1:48(S-3) showed a highest values of the number of cocoons and vermicasts production per earthworm biomass among the treatment ($$P{\leq_-}0.05$$) The contents of nitrogen, available phosphorus, cation exchange capacity and exchangeable cations of vermicasts tended to increase with stocking rate and rearing progressed. Vermicasts have a great deal of potential for crop production and protection in sustainable organic cropping systems.
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