Nitrogen Distribution and N2-fixing Activity of Developing Soybean (Glycine max (L.) Merrill) Plants
Other Title
大豆品種間固氮作用活性與氮素分佈之比較
Resource
Journal of Agricultural Research of China 29(2): 93-102
中華農業研究 29(2): 93-102
Journal
中華農業研究
Journal Volume
29
Journal Issue
2
Pages
93-102
Date Issued
1980-06-03
Date
1980-06-03
Author(s)
D.D. Huang
M.C.Shen
C.S. Chen
D.J. Liu
黃定鼎
沈美珍
陳建山
劉大江
Abstract
Field experiments were conducted to investigate the distribution of N and the specific activity of N2-fixation of soybeans at successive stages of plant development. Nitrogen concentration in leaf blades was consistently higher than those in leaf petioles, stems and roots. Concentration in each plant part, except the seeds, usually decreased as the season progressed. However, N in leaf blades showed a sudden decline at V7 stage and an increase later at R2 stage. Pattern of changes in N in plant parts from different varieties usually was similar.
During the pod-filling period (R4-R6), N was redistributed to seeds from vegetative tissues. Shih-Shih and Kaohsiung No. 3 maintained a higher level of N in leaf blades in this period as compared with other varieties. This was coincident with high N2-fixing activities of the two varieties at early reproductive growth stages.
Specific activities of N2-fixation increased continuously after the formation of root nodules and reached a maximum level at V7 stage. Varietal differences in degree of symbiotic fixation were also recorded.
Comparison of N distribution between spring and summer crops showed similar trends of N fluctuation. Translocation of N to seeds was more efficient in the spring crop for Shih-Shih and in the summer crop for Tainung No. 4 as indicated by decreasing N concentration in leaf blades.
試驗目的在探究大豆品種植株內氮素之分佈，以及固氮作用活性的變化，藉以明瞭大豆各生育期之營養需求。葉片內之氮濃度顯著高於葉柄、莖及根部，而與根瘤相近；除種子外，各器官內氮素濃度多隨植株之發育而逐慚降低，唯葉片 V7 期有顯著降低，R2 期再大幅上升的現象；各品種間未呈差異存在。莢果充實期（R4-R6），營養器官內氮素可轉移至種子，但十石與高雄三號葉片內氮素濃度高於其他品種，可能與生殖生長期仍具有較高之固氮作用活性有關。大豆固氮活性自根瘤形成後逐漸上升，V7 期達於高峰，開花後隨即下降，但品種間有程度性差異。春夏作之栽培結果顯示氮素營養變化模式並無明顯之期作性差異，而葉片內氮素於子粒充實期間之轉移速率則有不同。大豆生殖生長過程中，植株內有效性氮化合物大量減少，根部根瘤固氮作用能力亦低，可能不利於生理活性之維持。
Publisher
農業試驗所
Type
journal article
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