Effect of nitrogen form ratio on pansy growth and nutrition and the palatability to white‐tailed deer

Harris, Christine E.; Simonne, Eric H.; Eakes, D. Joseph

doi:10.1080/01904169909365757

Cited by 1 publication

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“…However, the high EC and low buffering capacity of the substrate (Fig. 4; Harris et al, 1999;Osorio et al, 2003) may have resulted in decreased availability and uptake of competing nutrients. High rates of N increased the number of plants infected with B. cinerea with high mortality occurring above 28.7 mM N ( Fig.…”

Section: Discussionmentioning

confidence: 99%

Impact of Applied Nitrogen Concentration on Growth of Elatior Begonia and New Guinea Impatiens and Susceptibility of Begonia to Botrytis cinerea

Pitchay¹,

Frantz²,

Locke³

et al. 2007

J. Amer. Soc. Hort. Sci.

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Plant performance and appearance in deficient and toxic levels of nutrients are well characterized. However, less is known about the potential subtleties of plant growth, form, development, nutrient uptake, and biotic stress tolerance in the broad tolerable range. Begonia [Beg (Begonia × tuberhybrida Voss)] and new guinea impatiens [NGI (Impatiens hawkeri Bull.)] were grown over a wide range of N (from 1.78 to 57.1 mm NH4:NO3 ratio at a 1:1 ratio supplied as nutrient solution) in a peat:perlite soilless substrate in greenhouse conditions. Plant growth, development, chlorophyll content, leaf angle, nutrient uptake, tissue caloric value, and susceptibility to Botrytis cinerea Pers.:Fr. disease were evaluated in two experiments. Elevated N supply resulted in decreased plant height (16% in Beg and 7% to 16% in NGI), flower count (3% to 48% in Beg and 7% to 49% in NGI), bud numbers (23% to 80% in Beg), canopy area (11% to 33% in NGI), and mass (21% to 33% in Beg and 18% to 58% in NGI). Chlorophyll content saturated at an N supply of 28.6 mm. N uptake efficiency, shoot N use efficiency, and shoot N utilization efficiency decreased with increasing N supply. Elevated levels of N supply from 7.15 to 57.1 mm also increased the susceptibility of Beg to B. cinerea disease by 10% to 80% in stems and 3% to 14% in leaves. The increase in susceptibility also corresponded with increased tissue energy content (kJ·g−1) and altered leaf orientation. This study indicates many plant changes occur between nutrient extremes that can have a significant impact on growth, development, and the ability to withstand disease.