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Proceedings of the International Plant Propagator's Society

Vol. 46

Marigold Growth Following Transplanting at Several Stages of Development

K. Oakley, R.L. Geneve, S. Kester and M. Stafford

pp: 622

There are several studies investigating the relationship between plug size and subsequent growth. These studies involve large plugs (>7 cm3). Marr and Jirak (1990) showed that tomato transplant size decreased with smaller root volumes and length of time held in plugs. Total tomato fruit yield after transplanting to the field, however, was not negatively affected. In marigold, transplants with smaller root volumes had decreased height for up to 7 weeks after transplanting into the landscape (Latimer, 1991). There are no reports on the influence of the smaller plug sizes (<7 cm3) typical of bedding plant production on subsequent transplant development. The objective of this study was to examine marigold seedling growth and development after transplanting as affected by root restriction, canopy competition, and transplant shock.

In the first of these experiments marigold (Tagetes patula ‘Little Devil Flame’) was seeded into each cell of a 392-count plug trays (4 cm3 per cell). Twelve

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