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Nitrogen and Potassium Rate Effects on Growth, Leaf Nitrogen and Winter Hardiness of Pyracantha coccinea ‘Lalandi’ and Ilex crenata ‘Rotundifolia’1

1972; American Society for Horticultural Science; Volume: 97; Issue: 4 Linguagem: Inglês

10.21273/jashs.97.4.446

2327-9788

James D. Kelley,

Flowering Plant Growth and Cultivation

Abstract Pyracantha coccinea Dipp. ‘Lalandi’ and Ilex crenata Maxim, ex Matsum. ‘Rotundifolia’ were grown in 1-gal containers for 1 growing season at 6 rates of N and 6 rates of K with treatments arranged in a factorial design. Nitrogen at moderate rates (1.32 and 1.98 lb. of NH 4 NO 3 per 100 gal water) produced the best growth response as determined by number of laterals and total growth per plant. Higher rates produced little or no additional growth. Optimum concn of leaf N was about 2.32% for P. coccinea and 2.65% for I. crenata . Potassium rate had no significant effect on growth or leaf N. Interactions between N and K were not significant. High correlation coefficients (r = .95) were found between leaf N and total growth per plant for both species. The N status and total growth response of these species can be best determined by leaf analysis. Nitrogen concn in leaves of P. coccinea and ability to overwinter were negatively correlated.