벼의 엽색은 시비시기를 결정하는데 주요한 인자로써 가시부 영역에서 해석하고, 이들 엽색을 지배하는 광합성색소는 T.L.C.로 분리하여 검토하였다. 1. 벼의 엽색은 413, 432, 453nm(청색부)와 662nm(적색부)에서 흡광되였고, 그 중에서 최대흡광은 432, 662 nm 이었다. 2. 양흡광도비(청색부/적색부)는 벼 생태형간에는 근 차이는 없었으나. 비료간에는 비료양이 증가할수록 적었다. 3. 양흡광도비와 엽색도 및 엽록소함량과는 부의 유의상관이 인정되었다. 4. 광합성색소 조성비율은 출수기에서는 녹색계통색소, 출수후 30일에는 황색계통색소의 조성비율이 각각 컸다. 5. 벼 생태형별 광합성색소율 Chl. a의 조성비율은 출수기에는 다수계품종이 일반계품종보다 컸고, 출수후 30일에는 일반계품종이 다수계품종보다 컸으나, carotene는 그 반대이었다.

A large number of the set-nets are set in Namhaedo coast of Korea. The floats of these set-nets are not only small even in case of large floats but also they scarcely have distinguishable marks such as light buoys or flags, so that they are very hard to be recognized by naked eyes and thus became probable obstacles to navigation for the passing ships and the fishing vessels. In order to research the capability of detecting such nets with Radar, the author investigated a maximum detectable range of the ordinarly large floatsand of a floating corner reflectors of various size and shape by Radar. The results obtained are as follows; 1. A maximum detectable range of large floats at a close range can be calculated by the Radar equation in sufficient accuracy. 2. Large floats of the large set-nets are also detectable by Radar even though it's detectable range boundary was within 0.2-0.65 miles. And the Radar picture of large floats was easier to be found with somewhat higher setting of the gain control on shorter range scale of the 1 mile. 3. Floating corner reflector rather suitable for set-net floats of "S" type reflector proposed in this paper, of which the dimension must be above 17cm in diameter to be detectable by Radar at 2 miles.t 2 miles.