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KMID : 0368419810240010001
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Journal of Plant Biology
1981 Volume.24 No. 1 p.1 ~ p.12
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Primary Productivity and Matter Economy of a Maize Plant Population
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Huque M. Anwarul
Song Seung-Dal
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Abstract
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Phosphorus dynamics in terms of specific absorption rate, inflow and outflow rates, turnover rate, demand and supply, and utility index of a high yield Zea mays L. cv. Bokgyo field were evaluated using an analysis of successive production structures. The analysis was adopted for measuring quantitative changes in the population by stratified clip technique on every two weeks during the growing season. The seasonal trends of specific absorption rate (2.4㎎ P/g/day in maximum) and specific absorption efficiency (0.03) closely correlated with that of relative growth rate of the population. The overall inflow and outflow of phosphorus was 3.41g P/㎡/yr showing the maximum inflow of 2.99g p/㎡/month in July. While the maximum phosphorus standing crop was 1.4g P/㎡ showing the maximum turnover rate of 178% in late June. The accumulation of phosphorus along plant height declined monotonically in stems and roots but increased in foliage after heading. The proportions of the total annual demand of phosphorus were 24.4% for leaves, 22.5% for stems, 49.6% for fruits and 3.5% for roots. These demands were met with internal (18.2%) and external (81.8%) supples. The seasonal highest phosphorus utility index was 1,091 in early June, while the average value was 655.
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