Responses of French marigolds (Tagetes patula) to phosphorus concentration in nutrient solution

Watanabe, Y.; Kimura, N.; Shimada, N.

Technical Bulletin, Faculty of Horticulture, Chiba University 34: 15-19

1984


Accession: 001450759

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Abstract
French marigolds were grown in sand culture with five different P levels (1.1, 5.6, 11.3, 28 or 56 p.p.m. P ) in a Kimura nutrient solution. Plant growth rate increased steadily with increasing P concentration up to 11.3 p.p.m.; above this concentration increases in plant growth rate were slight. No symptoms of P toxicity were observed. The numbers of flower buds and florets increased in proportion to P levels. P concentration had no significant effect on acid phosphatase activity, but analyses of P compounds in treated plants showed that inorganic P concentration increased with plant growth rate.