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Acta Agron Sin ›› 2016, Vol. 42 ›› Issue (01): 43-50.doi: 10.3724/SP.J.1006.2016.00043

• CROP GENETICS & BREEDING·GERMPLASM RESOURCES·MOLECULAR GENETICS • Previous Articles     Next Articles

Design of Test Location Number and Replicate Frequency in the Regional Cotton Variety Trials in China

XU Nai-Yin1,JIN Shi-Qiao2,LI Jian1   

  1. 1 Institute of Industrial Crops, Jiangsu Academy of Agricultural Sciences / Key Laboratory of Cotton and Rapeseed, Ministry of Agriculture, Nanjing 210014, China; 2 National Extension and Service Center of Agricultural Technology, Beijing 100125, China
  • Received:2015-05-06 Revised:2015-09-06 Online:2016-01-12 Published:2015-10-08
  • Supported by:

    This research was supported by the National Transgenic Project of China (2012ZX08013015) and the Project from National Extension and Service Center of Agricultural Technology (012022911108).

Abstract:

The test location number and the replicate frequency in regional crop trials are important factors in determining both the trial heritability and cultivar selection efficiency. The test location number and replicate frequency for three national cotton regional trials in China were studied using experimental data during the last 15 years according to changes of trial heritability with the increase of test locations and replicates within trials in 2000–2014. The results indicated that three replicates are sufficient to achieve 0.75 of within-trial heritability. The current test locations in the Yangtze River Valley, the Yellow River Valley and the Northwest Inland regions are sufficient to achieve 0.75 of cross-trial heritability. Considering the importance of the regional trials in recommending cotton varieties and the possible trial cancellation due to poor field managements, natural disasters or other non-artificial factors, the optimum number of test locations proposed for the Yangtze River Valley should be maintained at the current level of 20 locations with H = 0.90 to ensure the enough credibility of regional trials, while that proposed for the Yellow River Valley and the Northwest Inland cotton regions should be increased to 27 and 19 locations with heritability level of 0.90 and 0.85, respectively. The conclusion will provide a theoretical guidance for the optimal configuration of national cotton regional trials and also act as a reference for the rational layout of regional trials in other crops.

Key words: Cotton (Gossypium hirsutum L.), Regional trial, Heritability, Noise-signal quotient, Frequency of replicates, Number of test locations, Optimal allocation

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