Effects of date and degrees of defoliation on seed yield and fatty acid composition of perilla (Perilla ocymoids L.)
1988
Bin, Y.H. | Choe, Z.R. | Yang, M.S. | Kim, S.H. (Kyongsang National Univ., Chinju (Korea R.). Coll. of Agriculture)
In order to find out the effects of the time and degree of defoliation on the seed yield, oil content and fatty acid composition of perilla seed, two cultivars, Namhae and Geumnung, were grown in two years, 1985 and 1987. Defoliation was initiated after 110 days from sowing with two-week interval. Defoliation degree was manipulated into four levels i.e. 0, 25, 50 and 75% based on the total leaf area per plant. Flowering date, maturing date, culm length, culm diameter and branch numbers were not significantly influenced by the defoliation time and degrees, but by the cultivars. The higher levels of defoliation was made, the lower seed yield and 1000-seed were obtained, and either the earlier or the later time of defoliation, the less influence on seed yield were observed for both cultivars. Severe defoliation caused a significant decrease in oil content. The composition of unsaturated and saturated fatty acids was significantly decreased by severe defoliation (above 25%). In conclusion, with a view to achieving higher seed yield and oil content with good quality, it is advisable to defoliate perilla leaf less than 25 % based on total leaf area at earlier or later growth stages
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