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Sources of variation in participatory varietal selection trials with rainfed rice: Implications for the design of mother-baby trial networks

By: Contributor(s): Material type: TextTextPublication details: Mexico, DF (Mexico) CIMMYT : 2002Description: p. 36-43ISBN:
  • 970-648-096-X
Subject(s): DDC classification:
  • 633.1553 BEL
Summary: Little information has been published on the repeatability of participatory varietal selection (PVS) trials. Repeatability estimates, which can be derived from the combined analysis of trials over locations and years, are useful for determining the number of replications and the optimal blocking structure of PVs trials. Variance components were estimated from a series of uplandand lowland PVS trials conducted in the states of Jharkand and Bihar in eastern India, and used to estimate the repeatability of means. In both sets of trials the cultivar x site x year variance component was larger than the cultivar x site component, indicating that there was little specific adaptation to sites within the trials series. Participatory varietal trials conducted on-farm under farmer management were quite repeatable; replication over 5 sites was predicted to result in a repeatability of more than 0.5 in both data sets. Simulation indicated that a modest benefit is likely from the use of alpha-lattice designs when among-farm variances are large in experiments conducted using the mother-baby design, which treats farms as incomplete blocks.
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Little information has been published on the repeatability of participatory varietal selection (PVS) trials. Repeatability estimates, which can be derived from the combined analysis of trials over locations and years, are useful for determining the number of replications and the optimal blocking structure of PVs trials. Variance components were estimated from a series of uplandand lowland PVS trials conducted in the states of Jharkand and Bihar in eastern India, and used to estimate the repeatability of means. In both sets of trials the cultivar x site x year variance component was larger than the cultivar x site component, indicating that there was little specific adaptation to sites within the trials series. Participatory varietal trials conducted on-farm under farmer management were quite repeatable; replication over 5 sites was predicted to result in a repeatability of more than 0.5 in both data sets. Simulation indicated that a modest benefit is likely from the use of alpha-lattice designs when among-farm variances are large in experiments conducted using the mother-baby design, which treats farms as incomplete blocks.

English

0109|AGRIS 0201|AL-Economics Program|R02CIMPU

Juan Carlos Mendieta

CIMMYT Publications Collection


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