Soybean [Glycine max (L.) Merr.) is known to produce the highest total digestible mutrients (TDN) yield among summer grain legumes in Jeju area but little is known about the effects of cultural practices on forage yield and quality. A determinate soybean cv. Baegunkong was planted on 5 June, 20 June, and 3 July and grown at four plant densities (30, 50, 70 and 90 plants m-2 in 1998 in Jeju to evaluate the effects of planting date and plant density on the yield and quality of soybean forage. Days to flowering decreased from 47 to 38 days, average plant height from 61 to 51cm and main stem diameter from 6.31 to 5.00mm as planting was delayed from 5 June to 3 July. Average plant height quadratically increased from 45 to 62cm as plant density increased from 30 to 90 plants m-2 . Planting date did not affect the average dry matter, crude protein, and TDN yields. The average dry matter and TDN yields displayed a quadratic response to plant density and the optimum plant density for both dry matter and TDN yields was estimated about 60 plants m-2 . Plant density had no effect on crude protein yield. Planting date did not significantly influence forage quality. The crude protein content was not significantly influenced by plant density. Increasing plant density slightly increased acid detergent fiber content but slightly decreased TDN content.

알팔파 (Medicago sativa L.)의 예취후 재생 기간중 저장탄수화물의 이용성을 규명하기 위해 수경재배하여 개화초기에 예취한 후 재생 24일간의 뿌리내 비구조탄수화물의 함량 및 전분 분해효소의 활력을 분석한 결과는 아래와 같다. 1. 재생초기 10일간의 잎과 줄기의 재생은 매우 느리게 진행되었으며, 예취후 뿌리의 성장이 억제되었다. 2. 예취후 초기재생 10∼14일간 뿌리내 가용성 당 및 전분의 함량은 다같이 감소하였다가 이후 빠르게 회복하는 경향이었다. 3. 재생기간중 exo-amylase의 평균 활력은endo-amylase에 비해 약 400배 이상 높았다. Exo-amylase의 활력은 재생 6일차(최고수준) 까지 증가하다가 이후 감소하였다. Endo-amylase의 활력은 재생초기 4일 동안 급격히 증가하다가 이후 재생 24일차(최고수준) 까지 서서히 증가하는 경향이었다. 이상의 결과들은 알팔파의 재생초기 동안 전분 분해효소의 활력의 증가와 아울러 뿌리내 저장탄수화물은 활발히 분해되어 새로운 조직의 재생에 이 용됨을 간접적으로 제시한다.

Methane production from grain dust was studied using a 3 L laboratory-scale anaerobic plug flow digester. The digester was operated at; temperature of 35, 45, and 55℃ hydraulic retention time(HRT) of 6 and 12 days; and influent concentration(S_0) of 7.8 and 9.0 % total solids(%TS). With ten different operation conditions, this study showed the significant effects of temperature, hydraulic retention time, and influent concentration on methane production, The highest methane-production rate achieved was 1.903 (L methane) /(L digester)(day) at 55℃, 6 days HRT, and S_0 of 7.8 %TS. A total of 3.767 L of biogas per day with a methane content of 50.57% was obtained from this condition. The ultimate methane yield(B_0 was found to be a function of temperature and influent concentration, and was described as : B_0= 0.02907T-0.1263-0.00297(T-10)(%TS), where TS is the total solids in the liquid effluent, and T is temperature(℃). Our results showed that thermophilic condition is better than mesophilic for grain dust stabilization in an anaerobic plug flow digester.

벼종자에 있어서 necrosis가 어떤 부위에 어떻게 발현 되는가를 알기 위하여 1967년도산 농림육호 종자의 배를 추출하여 T.T.C.방법에 의거 관찰조사한 결과는 다음과 같다. 1) 발아부위에서 necrosisgus상이 처음 발생하였다 2) 유아부위에서 유근부위로 necrosis 현상이 점차 확대되어 가는 것을 알수있었다. 3) 배의 표면조직에서 내부조직으로 necrosisgus상이 이행되어 감을 볼수있었다.