Search Results
You are looking at 1 - 4 of 4 items for :
- Author or Editor: Nancy C. Mingis x
- Journal of the American Society for Horticultural Science x
Abstract
Kalanchoe blossfeldiana Poelln. ‘Feuerzauber’ plants were grown with sufficient and insufficient levels of N and Ca and differences in leaf concentrations of each nutrient between the sufficient and insufficient treatments (“differential”) were determined at various times between 5 and 14 weeks after planting and for a range of leaf positions. Largest N and Ca differentials generally occurred in the same leaves. In young plants, 5 to 7 weeks old, the largest differentials occurred in the young leaves immediately below the pinch. At 8 weeks the largest differentials were found in the young leaves on the lateral shoots. With increasing plant age the largest differentials were continually found in the younger leaves on lateral shoots. Throughout the 5 to 14 week period, leaves which had the largest consistent differentials were young developing leaves at least 2 cm wide and are deemed best suited for foliar analysis.
Abstract
Optimum N and K rates were established for ‘Schwabenland Red’ Rieger begonia for weekly fertilization and for application with each watering. Weekly application of 400 ppm N or more and 150 ppm or less resulted in undesirable plant size reduction regardless of K level; 200 ppm was marginal and 250 and 300 ppm N were best. Weekly applications of 60 to 200 ppm K were best and equal when applied with 250 ppm N while levels of 250 ppm K and greater caused smaller final plant size. The best rates of N for application with each watering were 100 and 150 ppm; 75 ppm and lower and 200 ppm and higher had deleterious effects. K levels from 50 to 125 ppm were best for application with every watering while levels of 150 ppm and greater were undesirable.
Abstract
Analysis of deficiency symptoms and foliar analyses of canopy leaves (youngest leaves 5 cm of wider) of Rieger elatior begonias (Begonia X hiemalis Fotsch cv. Schwabenland Red) indicated that the minimum critical levels for K, Mg, and B lie in the ranges of 0.93 to 0.95%, 0.22 to 0.25%, and 13.0 to 14.0 ppm, respectively.
Abstract
Symptoms for 7 nutrient deficiencies were established for elatior begonia ‘Schwabenland Red’ (Begonia X hiemalis Fotsch.). These are summarized in the form of a key as follows:
a. Chlorosis is a dominant symptom.
b. Chlorosis interveinal.
c. Interveinal chlorosis on older leaves followed by light tan necrotic spots within chlorotic areas which expand until leaf dies........................................................................................................................Mg
cc. Interveinal chlorosis on younger leaves.....................................................................................................Fe
bb. Chlorosis not interveinal.
c. Lower leaves uniformly yellow then purplish yellow and finally necrotic.................i.....................N
cc. Margins of canopy leaves yellow, then murky green-brown, and finally necrotic; all symptoms spread toward the leaf center......................................................................................................................Ca
aa. Chlorosis not a dominant symptom.
b. Necrosis begins along the margin of lower leaves and progresses inward....................................................K
bb. Plants stunted but normal green..........................................................................................................................P
bbb. Rust color, striations and cracks develop on young leaf petioles and peduncles perpendicular to their axes; internodes shortened and lateral shoots prolific; young leaves brittle crinkled around rust color spots which turn necrotic; chlorosis and necrosis spreading inward from the margin of young leaves...B