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| DOI: | 10.3719/weed.26.19 |
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| Web URL(s): | https://www.jstage.jst.go.jp/article/weed1962/26/1/26_1_19/_pdf
Last checked: 11/04/2013
Requires: PDF Reader |
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| Publication Type:
| Refereed |
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| Author(s): | Terasawa, Teruo;
Asano, Hiroomi;
Hirose, Shohei |
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| Author Affiliation: | Junior College of Agriculture, Nihon University, Fujisawa, Kanagawa |
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| Title: | The effect of shading on growth and seed productive structure of large crabgrass and common purslane |
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| Article Series: | Ecological studies on environmental adaptation in weeds, part 4 |
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| Source: | Zasso Kenkyu. Vol. 26, No. 1, 1981, p. 19-23. |
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| Publishing Information: | [Tokyo]: Nihon Zasso Bojo Kenkyukai [The Weed Science Society of Japan] |
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| # of Pages: | 5 |
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| Related Web URL: | https://www.jstage.jst.go.jp/article/weed1962/26/1/26_1_19/_article
Last checked: 11/04/2013
Notes: English abstract only |
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| Abstract/Contents: | "As a part of studying the mechanism of environmental adaptation in weeds, this experiment was carried out to investigate the effects of shading treatment on the vegetative growth and seed productive structure of large crabgrass (Digitaria sanguinalis var. marginata Fernal.) and common purslane (Portulaca oleracea L.). Through all growing period from emergence to maturity stage, two species of weeds, established at the rate of two plants per a/5, 000 pot, were grown under four conditions, i. e., 100, 60, 40 and 25% of natural solar radiation. 1. Through the whole growing period, the vegetative growth of both weeds generally decreased with increasing the shading intensity, at maturity stage, however, the culm length of large crabgrass and stem length of common purslane showed the maximum value under 60 and 25% condition, respectively. 2. The seed production components of large crabgrass decreased with increasing the shading intensity, but the effects of shading on 1, 000 kernels weight were not clear. As for common purslane, on the other hand, number of pyxides and seeds, and seed weight per plant, except for some other characters which decreased gradually with the increase of shading intensity, showed the maximum value under 60% condition. 3. In large crabgrass, little effect of shading treatment on crude reproductive efficiency (CRE) were observed in showing the range from 3 to 4%. In common purslane, however, the highest value of CRE was observed under 60% condition, with about 26% of CRE. 4. The degree of phenotypic plasticity on vegetative growth was generally higher in large crabgrass than in common purslane, and on seed production components the reverse was true. On 1, 000 kernels weight, both weeds showed the comparative lower degree of phenotypic plasticity. 5. From the facts that common purslane and large crabgrass showed the stable growth and higher seed yield per plant under the conditions of 60 and 100% of natural solar radiation, respectively, it was proved that the clear difference of adaptability to shading condition was present between two species of weed. Moreover, the problems on environmental adaptation of weeds were discussed." |
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| Language: | Japanese |
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| References: | 12 |
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| See Also: | See also [part 1] "The effect of density on growth and seed productive structure of large crabgrass and common purslane" Zasso Kenkyu, 25(1) 1980, p. 10-16, R=232060. R=232060
See also [part 2] "The effect of nitrogen level on growth and seed productive structure of large crabgrass and common purslane" Zasso Kenkyu, 25(2) 1980, p. 88-92, R=232062. R=232062
See also [part 3] "The effect of soil moisture on growth and seed productive structure of large crabgrass and common purslane" Zasso Kenkyu, 26(1) 1981, p. 14-18, R=232066. R=232066
See also [part 5] "Effect of past record of fertilizer application on growth response of large crabgrass (Digitaria adscendens Henr.) and common purslane (Portulaca oleracea L.)" Zasso Kenkyu, 36(2) 1991, p. 142-147, R=232107. R=232107
See also [part 6] "Effect of past record of plant density on growth response of large crabgrass (Digitaria adscendens Henr.) and common purslane (Portulaca oleracea L.)" Zasso Kenkyu, 36(2) 1991, p. 148-152, R=232109. R=232109 |
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| Note: | English summary appears as abstract
Tables
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Terasawa, T., H. Asano, and S. Hirose. 1981. The effect of shading on growth and seed productive structure of large crabgrass and common purslane. (In Japanese) Zasso Kenkyu. 26(1):p. 19-23. |
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| DOI: 10.3719/weed.26.19 |
| Web URL(s):
https://www.jstage.jst.go.jp/article/weed1962/26/1/26_1_19/_pdf
Last checked: 11/04/2013
Requires: PDF Reader |
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MSU catalog number: b9910272 |
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