Nitrogen and calcium nutrition of Petunia × hybrida ‘Coral Sea’ |
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Authors: | JJ Frett MA Dirr AM Armitage |
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Institution: | Department of Horticultural Science, Texas A&M University, College Station, TXU.S.A.;Department of Horticulture, University of Georgia, Athens, GAU.S.A. |
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Abstract: | The effects of N and Ca nutrition on plant growth and shoot elemental content of Petunia × hybrida Hort. Vilm. - Andr. ‘Coral Sea’ were evaluated. Nitrogen and Ca were applied separately or in combination in three experiments: (1) N at 0, 100, 200 or 400 mg l?1; (2) Ca at 0, 75, 150 or 300 mg l?1; (3) N at 0 or 100 mg l?1 and Ca at 0 or 150 mg l?1 combined factorially. Shoot and root dry weights, branch length and flower number were highest when plants received 100 mg l?1 N. Plants treated with 150 mg l?1 Ca had the highest shoot and root dry weights. Branch length was maximal at 300 mg l?1 Ca.Nitrogen and Ca interacted to increase shoot dry weights, branch number and length, leaf area and flower number. Increasing N concentrations increased N and decreased P, Mn and Zn shoot contents. Calcium content of shoots increased while N, P and Mg decreased in response to increasing applications of Ca to petunia plants. Minimal N and Ca tissue concentrations for optimal P. × hybrida growth were 3.3 and 0.67%, respectively. |
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Keywords: | calcium mineral nutrition nitrogen Author to whom correspondence should be addressed |
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