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Acta Agron Sin ›› 2013, Vol. 39 ›› Issue (10): 1909-1915.doi: 10.3724/SP.J.1006.2013.01909

• RESEARCH NOTES • Previous Articles    

Effect of Water Management and Phosphorus on Agricultural Characters and As Concentration in Polished Rice of Two Rice Cultivars Differing in P-Efficiency under As-stress Conditions

ZHANG Xiu,GUO Zai-Hua*,DU Shuang-Shuang,WANG Yang,SHI Le-Yi,ZHANG Li-Mei,HE Li-Yuan   

  1. College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China?
  • Received:2013-01-31 Revised:2013-06-04 Online:2013-10-12 Published:2013-07-02
  • Contact: 郭再华, E-mail: gzh2005@mail.hzau.edu.cn, Tel: 15827131815

Abstract:

To explore the agronomic measures for mitigating As toxicity to rice, we conducted soil culture experiments to investigate the effect of three potential practical methods, water management regime, phosphorus (P) fertilization and their interaction on plant growth, grain yield and As concentration in polished rice in P-efficient rice cultivar 99011 and P-inefficient rice cultivar 99012 in various As-stress acid soils. Results indicated that compared with flooded conditions and / or insufficient P application, water-saving irrigation (maintaining the soil moisture from 65% of the maximum field water capacity to flooded conditions) and / or sufficient P application significantly increased the number of tillers, total spike, productive spike, root dry weight, biomass and grain yield of two rice cultivars regardless of As levels. Both rice cultivars had the best agricultural characteristics under water-saving irrigationcondition with sufficient P fertilization. So water management, P fertilization and their interaction all showed positive effect. At 50 mg kg-1 of As level, water-saving flooded treatment, but sufficient P application increased the As concentration in polished rice significantly compared with insufficient P supply. Thus the effect of interaction of water management and P fertilization was worse than the independent effect of water management, but better than the independent effect of P fertilization. At 100 mg kg-1 of As level, water-saving flooded conditions and/or insufficient P application, and their interaction effect was better than the independent effect of two factors. At the same treatment with As supply, all the investigated agricultural characteristics of low-P tolerant rice cultivar 99011 were better than those of low-P sensitive rice cultivar 99012, but the As concentration in polished rice was on the contrary. The study demonstrated that water management regime, P fertilization, and selection of P-efficient rice cultivars are effective measures that can be used to relieve the As stress to rice growth and the As accumulation in polished rice.management and/or sufficient P supply reduced the As concentration in polished rice clearly compared with management decreased the As concentration in polished rice markedly compared with

Key words: As level, Biological characters, Food safety, P-efficiency, P addition, Rice, Water management

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