Interplot competition in cassava (Manihot esculenta Crantz) variety trials
2019
Carpena, A.L.
Interplot competition for root yield in three-row plot variety trials in cassava (Manihot esculenta Crantz) was determined using data from six and 14 varieties evaluated in two cropping years in two sets of trials each (one with unbordered three-row plots and another with bordered three-row plots) and comparing yield performance of each entry in unbordered and bordered plots. In spite of significant differences among the varietal entries in plant height, a trait that could cause competition between adjacent cassava varieties in a trial, analyses of variance showed no significant differences between the two plot types in both crop years in terms of root yield, indicating the absence of intergenotypic competition for root yield in these experiments. The rank correlation of varietal rankings between bordered and unbordered plot trials was highly significant in the crop year with 14 entries, supporting the result of the analysis of variance. Thus, at least for three-row plot trials that usually involve several varieties, this study has indicated that the extra or guard row on each side of the effective plot can be done away with without affecting varietal comparisons.
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