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  • Author or Editor: A. Niemiera x
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Abstract

Ilex crenata ‘Helleri’ liners were greenhouse grown in sand culture and subjected to N rates which ranged from 14 to 108 ppm in one experiment and from 70 to 250 ppm in a second experiment. Maximum shoot dry weights occurred at 87 ppm N in the first experiment and at 100 ppm N in the second experiment. The number of plants per treatment initiating visible shoot elongation 17 days after the initiation of the fertilizer treatments was influenced by N treatment and 79% of the differences in final dry weights could be attributed to the time of visible shoot elongation initiation. The maintenance of 87–100 ppm N in the substrate nutrient solution, the range at which no further increase in shoot dry weight occurred, would maximize plant growth and most effectively utilize the applied fertilizer.

Open Access

Seedlings of 30-, 35, 40-, -45, and 50-day-old marigold (Tagetes erecta Big. `Inca Gold') in 500-ml plastic pots containing a 1 peat: 1 perlite (v/v) medium were treated with several fertilizer levels (N at 20, 50, 80, and 110 mg·liter-1); solution nutrient levels in the medium were determined 6 hours later. Older/larger container-grown plants absorbed more N, P, and K from the medium solution than younger/smaller plants. Also, older plants (>40 days) absorbed at least 88% of the solution N regardless of N treatment. Nitrogen absorption, regardless of plant age, increased as N application rates increased. The latter result implies that even though total N absorption increases with plant age/size, nutrient levels in the medium solution for optimal growth and nutrient uptake may be similar regardless of plant size.

Free access

The Southern Extension and Research Activities/Information Exchange Group-27 (SERA/IEG-27) is sponsored by the Southern Association of Agricultural Experiment Station Directors. Thirteen universities and the U.S. National Arboretum cooperate with official representatives from extension and research programs. The objective of the group is to identify, evaluate, select, and disseminate information on superior, environmentally sustainable, landscape plants for nursery crop production and landscape systems in the southeastern U.S. Plants are distributed to members responding to a request from cooperators for plant evaluation. Those who agree to cooperate are expected to grow the selected liner to landscape size, then transplant it in a landscape setting. The plant is rated for insect, disease, and cold damage, heat stress, growth rate, ornamental flowering and fruiting, fall color, commercial production potential, landscape potential, invasiveness potential, and insect disease transmission potential. Growth rate is evaluated annually by recording plant height and width. Initial bloom date is reported followed by bloom duration in days. Following evaluation, the group collectively and individually disseminates information gained from the plant evaluation system to a wide variety of audiences.

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