Search Results

You are looking at 1 - 2 of 2 items for

  • Author or Editor: Kay A. Lawton x
Clear All Modify Search

Abstract

Dark storage of Chinese hibiscus (Hibiscus rosa-sinensis L. cv. Brilliant Red) for 5 days to simulate shipping promoted flower bud abscission. Less developed flower buds (<30 mm) were more susceptible than developed buds to dark-storage-induced abscission. Removal of mature buds (>30 mm) before dark storage reduced subsequent abscission of younger, less developed buds. Plants grown under low irradiance conditions (500 µmol·s–1·m–2 PPF) abscised more flower buds in response to dark storage than those grown in high irradiance (980 µmol·s–1·m–2 PPF). These results indicate factors that decrease the availability and partitioning of photosynthates to immature flower buds increase the incidence of abscission.

Open Access

Abstract

The effects of nitrate and NH4NO3 used alone or in combination with CaCl2 sprays were examined on self-branching poinsettia (Euphorbia pulcherrima Willd.) cul-tivars Annette Hegg Dark Red (AHDR) and Gutbier V-14 Glory (Glory) and the standard cultivar Eckespoint C-1 Red (C-1). Stem retention was increased in the AHDR and C-1 that received Ca(NO3)2 liquid fertilization. Calcium chloride sprays enhanced stem strength of C-1 when used in combination with ammonium fertilizer, but not when used with Ca(NO3)2. Calcium chloride foliar sprays did not improve stem strength of the self-branching cultivars with either of the N fertilizer formulations tested.

Open Access