02308naa a2200313 a 450000100080000000500110000800800410001910000190006024500670007926000090014650001070015552014050026265000150166765000090168265000100169165000160170165000170171765000120173465000130174665000280175965000110178765300270179865300160182565300160184165300170185765300200187465300140189477300860190810856782018-10-01       2003    bl uuuu     u00u1 u    #d1 aARAÚJO, A. P.  aAnalysis of variance of primary data on plant growth analysis.  c2003  aTítulo em português: Análise de variância dos dados primários na análise de crescimento vegetal.  aPlant growth analysis presents difficulties related to statistical comparison of growth rates, and the analysis of variance of primary data could guide the interpretation of results. The objective of this work was to evaluate the analysis of variance of data from distinct harvests of an experiment, focusing especially on the homogeneity of variances and the choice of an adequate ANOVA model. Data from five experiments covering different crops and growth conditions were used. From the total number of variables, 19% were originally homoscedastic, 60% became homoscedastic after logarithmic transformation, and 21% remained heteroscedastic after transformation. Data transformation did not affect the F test in one experiment, whereas in the other experiments transformation modified the F test usually reducing the number of significant effects. Even when transformation has not altered the F test, mean comparisons led to divergent interpretations. The mixed ANOVA model, considering harvest as a random effect, reduced the number of significant effects of every factor which had the F test modified by this model. Examples illustrated that analysis of variance of primary variables provides a tool for identifying significant differences in growth rates. The analysis of variance imposes restrictions to experimental design thereby eliminating some advantages of the functional growth analysis.  aphosphorus  arice  aArroz  aCrescimento  aEstatística  aFeijão  aFósforo  aLycopersicon Esculentum  aTomate  aAnálise de variância  aANOVA model  acommon bean  aModelo ANOVA  amodelo de ANOVA  astatistic  tPesquisa Agropecuária Brasileira, Brasília, DFgv. 38, n. 1, p. 1-10, jan. 2003