REFERENCES
- Dillon , E. S. and Zobel , B. J. 1957 . A simple test for viability of pine pollen. . J For. , 55 ( 1 ) : 31 – 2 .
- Duffield , J. W. 1954 . Studies of extraction, storage and testing of pine pollen. . Z. Fortsgen Forstpflanz. , 3 ( 2 ) : 39 – 45 .
- Duffteld , J. W. and Snow , A. G. 1941 . Pollen longevity of Pinus strobus and Pinus resinosa as controlled by temperature and humidity. . Amer. J Bot , 28 : 176 – 7 .
- Hyun , S. K. 1956 . Forest tree breeding work in Korea. Inst. For. Gen. Korea Inst. Pap. No. 1.
- Orr-ewing , A. L. 1956 . Controlled pollination techniques for the Douglas Fir. . For Sci. , 2 ( 4 ) : 251 – 7 .
- Bighter , F. L. 1939 . A simple method of making germination tests of pine pollen. . J For. , 37 ( 7 ) : 574 – 6 .