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The influence of increased CO 2 concentration and supplementary illumination on growth of tomato seedlings during the winter months
Author(s) -
NEWTON PETER
Publication year - 1966
Publication title -
annals of applied biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.677
H-Index - 80
eISSN - 1744-7348
pISSN - 0003-4746
DOI - 10.1111/j.1744-7348.1966.tb03828.x
Subject(s) - biology , dry weight , mercury (programming language) , horticulture , botany , assimilation (phonology) , zoology , linguistics , philosophy , computer science , programming language
SUMMARY During the period November to March a threefold increase in CO 2 concentration had only a small effect on the growth rate of tomato seedlings, variety Eurocross B. Although net assimilation rates were increased, some inhibitory effects of increased CO 2 concentration on leaf growth were found when the seedlings were very small. The increase in dry weight was equivalent to that made in a few days by plants grown with naturally occurring amounts of CO 2 . There was no increase in the rate of flower initiation. Using supplementary illumination for 17 hr. per day with high‐pressure mercury vapour lamps made it possible to produce in November‐December seedlings similar to those grown during March‐April with natural illumination.