| Photosynthetic characteristics of spring soybean cultivars with high density tolerance |
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| DOI：10.7606/j.issn.1000-7601.2014.03.031 |
| Key Words: soybean planting density photosynthetic characteristics water use efficiency yield |
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| Abstract: |
| We used two soybean cultivars and conducted three treatments of planting density, 225 000, 300 000, and 375 000 plant·hm-2. The results showed that the high density tolerance cultivars like KenFeng16 had high leaf shape index and short petioles at upper canopy. With the density increased, Kenfeng16 had shorter leaf petiole length and higher leaf index than conventional cultivars like Hefeng39. The leaf color did not change significantly and the duration of leaf stay-green was longer. The net photosynthetic rate and water use efficiency differed significantly between Kenfeng16 and Hefeng39 under the density of 300 000 plant·hm-2 and 375 000 plant·hm-2. The reason that Kenfeng16 outyielded Hefeng39 under high density is that it had a rational canopy struc
ture, resulting in favorable conditions of air and light for soybean. |
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