摘葉處理가 大豆의 收量 및 諸 形質에 미치는 影響 = Effects of Defoliation on Soybean Yield and Some Agronomic Characteristics

다국어 초록 (Multilingual Abstract)

The influence of 4 levels of defoliation(0, 1/3, 2/3 and 3/3) on seed yield and other important agronomic characteristics were evaluated at each of 5 stages of growth(R_1, R_2, R_3, R_4, R_5, R_6). The indeterminate cultivar 'Clark' was engaged in this experiment and the experiment design was a split plot with 5 stages of soybean growth as whole plots and 4 levels of defoliation as subplots, with 3 replicates.
The results were summarized as follows :
1. Development of new leaf are after defoliation was greater at the initial stages than at the later stages.
2. An increase in defoliation at growth stage R_2 was delayed in maturity, but hastened at R_6.
3. The more levels of defoliation increased and stages of defoliation were early, the more stem height and stem weight reduced. Main stem nodes and number of branches did not significantly reduce at any stages of defoliation, but any level of defoliation did.
4. Number of pods and number of speeds per plant reduced linearly with levels of defoliation and stages ; maximum number of pods and seeds per plant reduction of 55.4 and 58.5 occurred in 3/3 defoliation at stages R_4 and R_5, respectively. 100 seed weight did not significantly reduce at stages of defoliations, but any level of defoliation did.
5. Seed yield reduced severely with levels of defoliation and stages ; maximum seed yield reduction of 31.8 kg/10a(85.6%) occurred in 3/3 level of defoliation at stage R_5.
6. Levels of defoliation had significant negative correlation with number of pods, number of seeds per plant and seed yield at all stage, but maturity, stem height and seed weight were different at stages of defoliation.
7. The mean oil content was 19.3, 17.8 and 16.8% respectively, in 1/3, 2/3 and 3/3 level of defoliation, but protein content had no significant effect at defoliation.
8. Germination percentage was 86.2 at 3/3 level of defoliation compared with undefoliation.