In:
HortScience, American Society for Horticultural Science, Vol. 40, No. 4 ( 2005-07), p. 1086D-1086
Abstract:
Nitrogen and potassium changes in poinsettia `Supjibi Red' were evaluated at four stages: vegetative growth, inductive stage, bract development and flowering. Nitrogen doses were 100, 200, 300, 400, and 500 mg·L -1 and those of potassium were: 175, 250, 325, and 400 mg·L -1 , which were applied constantly with irrigation. Plants were grown in 7-inch pots with tezontle as the substrate. A completly random experimental design with nine treatments and 10 replicates was used. Short photoperiod was applied from 61 days after transplant, covering plants for 14 hours from 7 pm on. Samples for nitrogen and potassium evaluations were taken from recently grown-up leaves at 25, 50, 75, 100 and 125 days after transplant. Nitrogen absorption increased up to 75 days after transplant; treatments with 400 and 500 mg·L -1 of nitrogen induced the highest foliar levels 2.44% and 2.6%, respectively. In the following sampling dates, nitrogen decreased for all treatments. Potassium content decreased as plants developed; highest levels were obtained 25 days after transplant. The 325 and 400 mg·L -1 K treatments induced the highest concentrations in leaves 7.04% and 7.02%, respectively. Thus, it is confirmed that nitrogen is required throughout vegetative growth, and potassium just in the initial stage of vegetative growth.
Type of Medium:
Online Resource
ISSN:
0018-5345
,
2327-9834
DOI:
10.21273/HORTSCI.40.4.1086D
Language:
Unknown
Publisher:
American Society for Horticultural Science
Publication Date:
2005
detail.hit.zdb_id:
2040198-X
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