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  • Author or Editor: Michael H. Chaplin x
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Mycorrhizal red raspberry (Rubus idaeus L.) plants colonized by Glomus fasciculatus (Thaxter) Gerd. & Trappe had higher concentration of plant P than non-mycorrhizal colonized by Glomus fasciculatus at 0, 22 and 44 ppm soil P levels. Total P uptake was greater in mycorrhizal plants than controls at 22 and 44 ppm added P. The presence of mycorrhizae did not influence N, Mg, B, and Zn concentrations at any soil P level. K concentration in mycorrhizal plants was lower than controls at 22 ppm added P, but total K uptake was the same. Copper concentration was higher in mycorrhizal plants at the highest P level. P additions significantly influenced the total uptake of all elements except Cu and the concentration of all elements except An and Mn.

Open Access

Ground water contamination resulting from continuous liquid fertilization technologies is a serious problem facing greenhouse growers in the United States. Rooted Dendranthema grandiflora Tzvelev. cultivar 'Iridon' cuttings were transplanted into 11 cm pots filled with a 50% peatmoss and 50% perlite (v/v) media containing 0.10, 0.21, 0.42, or 0.84 g N from a controlled release 12-10-17 plus minors fertilizer deposited directly below the transplanted cutting. Pots were assigned to a top-water or subirrigation treatment.

Subirrigation reduced the nitrate leachate concentration by as much as 250 ppm as compared with top-watering. Fertilizer N rate linearly decreased plant height in both of the irrigation treatments. Final dry weight of the shoot peaked at the 0.21 g N rate in both the irrigation treatments.

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