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Acta Agron Sin ›› 2014, Vol. 40 ›› Issue (11): 2052-2056.doi: 10.3724/SP.J.1006.2014.02052

• RESEARCH NOTES • Previous Articles    

Discussion of Multistage Sampling Optimum Test Plans on Rice Cadmium Detection for Jiangsu Province

WANG Wei1,3,SONG Wen2,YIN Shuang-Yi1,XU Chen-Wu1,*   

  1. 1 Group of Biostatistics and Experiment Design, College of Agriculture, Yangzhou University, Yangzhou 225009, China; 2 Institute of Food Safety and Inspection, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China; 3 Life Science and Technology College, Henan Institute of Science and Technology, Xinxiang 453003, China
  • Received:2014-04-03 Revised:2014-09-16 Online:2014-11-12 Published:2014-10-01

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Abstract:

A three stage sampling survey as a real example was used to investigate the optimal plan of the sampling survey for cadmium in rice in Jiangsu Province. F-test showed that differences of the survey among cities and sampling villages were both very significant, and the error variance among cities was the largest in the experiment. In this paper, considering the survey expenses, the optimal sampling plan was explored under a certain accuracy. The results indicated that six cities were randomly sampled and twenty villages or agricultural extension stations were selected at random from each city, with twice sampling in each village in order to increase the precision of the survey. If there is a lack of funds, on the basis of ensuring the current sampling accuracy, we suggest that ten villages or agricultural extension stations from each city can be sampled alternatively.

Key words: Multistage sampling, Rice, Heavy metal, Optimal sampling plan

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