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Nebahat Sari, Emily Silverman, Danny Reiland, and Todd C. Wehner

leaf stage. Cotyledon length and width of nine plants per treatment combination were measured with a ruler at the stage where the cotyledons were parallel to the ground. The experiment was a randomized complete block design with nine replications of

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D. P. Ormrod, P. Allen Hammer, Donald T. Krizek, T. W. Tibbitts, J. Craig McFarlane, and Robert W. Langhans


‘First Lady’ marigold (Tagetes erecta L.) was grown 3 times in each of 5 different controlled environment facilities to establish baseline growth rates for this species. Plants were grown under a standardized set of environmental conditions established with a common set of standardized instruments. Data on plants grown only once in two additional laboratories are reported for comparative purposes. The variation in growth within each laboratory was greater than the average variation among laboratories for cotyledon length and width, plant weight measurements, and 3rd leaf length but not for leaf width. The base-line growth data, based on the described procedures, can be used to compare marigold growth in other controlled environments and to provide a check on the operational characteristics of research facilities.