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| Effects of soil pH on growth and grain cadmium content in rice |
| Received:October 07, 2016 |
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| KeyWord:rice;grain;cadmium content;pH;soil;available cadmium |
| Author Name | Affiliation | E-mail | | YI Ya-ke | Agronomy College of Hunan Agricultural University, Changsha 410128, China
Southern Regional Collaborative Innovation Center for Grain and Oil Crops in China, Changsha 410128, China | | | ZHOU Zhi-bo | Agronomy College of Hunan Agricultural University, Changsha 410128, China
Southern Regional Collaborative Innovation Center for Grain and Oil Crops in China, Changsha 410128, China | | | CHEN Guang-hui | Agronomy College of Hunan Agricultural University, Changsha 410128, China
Southern Regional Collaborative Innovation Center for Grain and Oil Crops in China, Changsha 410128, China | cgh68@163.com |
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| Abstract: |
| A pot experiment, with 5 early-rice cultivars and 4 late-rice cultivars, was carried out to investigate the characteristics of growth and grain cadmium(Cd) accumulation in rice under different soil pH conditions. The results showed that the main effects of cultivar and soil pH as well as their interactive effects on agronomic traits and yield were significant(P<0.05), and soil pH had the greatest effects. Yield per plant significantly decreased when soil pH was lower than 5.0 or higher than 7.0. The decrease in yield per plant related to soil pH was mainly due to reductions in number of grains per panicle and seed setting rate. Cd content in polished rice was significantly(P<0.01) affected by cultivar, soil pH and their interaction in early-rice, and the greatest effect was caused by soil pH. In late-rice, both cultivar and soil pH significantly(P<0.01) affected Cd content in polished rice, while their interaction was not significant. Significant(P<0.05) difference was observed in Cd enrichment coefficient among cultivar types. Super hybrid rice had the highest Cd enrichment coefficient, followed by conventional rice and hybrid rice. Growth duration had no significant effect on Cd enrichment coefficient. Cd content in polished rice was significantly(P<0.01) correlated with plant height and yield per plant, showing correlation coefficients of 0.412 and 0.371, respectively. There was no significant correlation between Cd content in polished rice with panicle length, number of grains per panicle, 1,000-grain weight and seed setting rate. In soils with a pH range of 4.0 to 8.0, Cd content in polished rice was significantly(P<0.01) correlated with soil available Cd content before rice transplanting, with a correlation coefficient of 0.710. |
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