Quality of cultivar competition experiments with corn in the State of Rio Grande do Sul - Brazil

Ciência Rural

Marques, Daniela Giffoni¹  Lopes, Sidinei José³  Storck, Lindolfo²  Martin, Thomas Newton³ 

[1] Universidade Federal de Santa Maria, Santa Maria;Universidade Federal de Santa Maria

关键词: :precision;    assumptions;    residual analysis;   

DOI  :  10.1590/S0103-84782000000300001

学科分类：农业科学（综合）

来源: Universidade Federal de Santa Maria * Centro de Ciencias Rurais

【 摘 要 】

This study aimed to quantify the proportion of experiments with statistical difference for blocks, cultivar and the F test assumption (additivity, normal distribution, random error, and error variance homogeneity among cultivars) observance. Also, the effects on the least significant difference (LSD) based on Tukey test (P=0.05) were quantified when some assumption was not observed. The statistical analysis was based upon 307 sets of experimental cultivar competition data carried out from 1993 to 1996 in the State of Rio Grande do Sul, Brazil. Among the experiments with significant differences in treatments (cultivars), 85.67% had an average LSD equal to 30.28%. Low frequency of non assumption observance was verified and increased the LSD. Lack of additivity on the model occured in 8.75% the trials and not modify LSD of data transformation. No random error effect was verified in 9.88% of the experiments due to variability among plots at the same block caused by inadequate block placement in the experimental area.

【 授权许可】

CC BY-NC