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《Soybean Science》 1986-02
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STUDIES ON THE RELATIONSHIPS BETWEEN PLANT TYPEPOPULATION STRUCTURE AND YIELD IN SOYBEANⅡ. SEED DISTRIBUTION IN SOYBEAN CANOPIES

Sun Zhuotao Dong Zuan(Shenyang Agricultural Unitvertity)  
The experiments were conducted from 1981 to 1984. Under field conditions. the leaf-pod relationship was studied and the relationships between physiological-ecological conditions of soybean canopies and seed distribution were analyzed. The results are at follows:1. By means of fuzzy cluster analysis, the cultivars used in the experiment were divided into top-podding type, middle-podding type and even-podding type according to seed weight percentages of upper, middle and lower canopy segments, conforming with determinate, indeterminate and sub-determinate types, respectively. The cultivars Were also classified into main stem-podding type and branch-podding type according to seed weight percentages of main stem and branches. Some data of the classification "were provided.2. There was an apparent leaf-pod relationship in soybean canopies. The greater the leaf area which produced material underlying seeds, the more and larger the seeds in the same canopy segment. Great attention should be paid to the phenomenon in plant-type breeding and selecting cultivation measures.3. The measures which may raise the productivity of the upper segment of the canopy should be employed to increase the yield of determinate type (top-podding type). It seemed that the yield of an indeterminate variety (middle-podd ng type)was mainly dependent upon the productivity of the middle and upper canopy segments. In order to increase the yield of sub-determinate type (even-podding type), the productivity of upper, midble and lower canopy segments should be harmoniously developed and proportionally increased.The main stem of the main stem-podding type gave leading contribution to its yield, but the branches also gaue certain contribution to it. However, the yield of the branch-podding type was depended upon its main stem.4. Planting density was an important cultivation measure to regulate the seed distribution between main stem and branches. If the productivity of the branches is to be emphatically brought into play, the planting density should be smaller. On the contrary, the reverse is true.5. Because the extinction coefficient of soybean populations is greater and the light intensity in the middle and lower parts of the canopy is weaker, it is necessary to improve the plant type and the quality of leaves to compensate the disadvantages. As tbe rise in the light intensity in the popenate the bisadvantages. As the rise in the light intensity in the population and the improvement in the quality of leaves, the photosynthetic rates of leaves in the middle and lower parts of the canopy are bound to be increased and the productivitypf the whole canopy brought into full play,
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