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John J. Sloan, Raul I. Cabrera, Peter A.Y. Ampim, Steve A. George, and Wayne A. Mackay

greenhouse containers ( American Association of Nurserymen, 1996 ) was planted with rooted cuttings (one per pot) from the perennial flower, ‘Blue Princess’ verbena. The verbena cuttings were collected from established beds and rooted in 100% perlite medium

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Howard F. Harrison Jr. and Mark W. Farnham

Horticultural Distribution, Bellevue, WA) and washed river sand. Powdered limestone and controlled-release fertilizer (Osmocote 15–9–12 plus; Scotts, Marysville, OH) at 1.1 g·L −1 potting medium were added, and the mixture was blended in a portable cement mixer

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Shadia Nada, Siva Chennareddy, Stephen Goldman, Sairam Rudrabhatla, Shobha Devi Potlakayala, Puthyaparambil Josekutty, and Karelia Deepkamal

regeneration of plantlets within 3 months. Materials and Methods Seeds of Begonia tuberhybrida obtained from the Oglevee Ltd. (Connellsville, PA) were planted in the greenhouse in 15.2-cm pots with four seeds in each pot. Fully expanded leaves with ≈3- to 4

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Malik G. Al-Ajlouni, Jamal Y. Ayad, and Yahia A. Othman

The selection of a growing medium is a key factor in soilless systems ( Samadi, 2011 ). For successful root penetration and shoot growth, soilless substrate should have high total porosity, low bulk density, optimal WHC, and excellent stability

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Matthew G. Blanchard and Erik S. Runkle

700 μmol·m −2 ·s −1 . After the chemical application, liners were placed on a greenhouse bench for 3 h and then plants were subsequently transplanted into 4.5-inch-diameter round plastic pots (volume, 591 mL) containing a commercial soilless medium

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T. Casey Barickman, Thomas E. Horgan, Jennifer R. Wheeler, and Carl E. Sams

, Rochester, NY) were sown into Pro-Mix BX soilless medium (Premier Tech Horticulture, Québec, Canada) and germinated in greenhouse conditions at 25/20 °C (day/night). At 27 d after seeding, the plantlets were transferred to 3.8-L plastic nursery pots filled

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Arthur Villordon, Jeffrey C. Gregorie, and Don LaBonte

wheat ( Triticum aestivum ) varied between field-based and solution culture-based screenings. Three Pi levels were used: 0 (low Pi), 0.17 (medium Pi), and 0.34 (high Pi) g/pot TSP. The volume of the substrate was 1994 cm 3 per pot, with a bulk density

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Brian E. Jackson, Robert D. Wright, and Mark M. Alley

herbaceous species when CaSO 4 was incorporated. Samples of PTS were tested for pH before potting and not amended with lime as a result of the relatively high pH (≈6.0) observed, which has been previously reported in freshly ground pine wood ( Wright et al

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Richard J. McAvoy

Lilium longiflorum Thunb. cv. Ace grown without plant growth regulators and plants drenched with 0.5 mg a.i. ancymidol per pot following shoot emergence were compared to plants growing in a medium containing uniconazole-impregnated amendments. Uniconazole was applied at rates of 0.18, 0.018, and 0.0018 mg a.i. per pot using either impregnated rockwool (RW) or copolymer acrylamide acrylate (CA). Two other treatment groups received a uniconazole drench at potting (0.018 or 0.0018 mg a.i. per pot). Impregnated CA resulted in undesirably short lilies (i.e., plants <1.5 times the height of the pot) when 0.18 mg uniconazole per pot was incorporated into the medium; effective height control was obtained with CA at 0.018 mg/pot; no height control was observed at 0.0018 mg/pot. Similarly, final height of lilies grown in medium containing uniconazole-impregnated RW decreased as the rate of uniconazole increased. Pre-emergence potting medium drenches with uniconazole (0.018 and 0.0018 mg a.i. per pot) did not significantly affect lily growth and flowering. Ancymidol drench was less effective at retarding stem length and plant height than medium incorporation of 0.18 mg uniconazole. Flowering was not significantly affected by any treatment. Chemical names used: a-cyclopropyl-a-(4-methoxy-phenyl)-5-pyriimidine methanol(ancymidol);B-[(4-cyclophenyl)methyl]-a-(1,1-dimethylethyl)1 H-1,2,4-triazole-1-ethanol(paclobutrazol);(E)-(p-chloro-phenyl)-4,4-dimethyl-2-(1,2,4-triazol-1-yl)-1-penten-3-ol(uniconazole).

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Alicia Sanchez-Escarcega and George C. Elliott

The potential for N mineralization or immobilization in potting media containing compost was investigated in experiments using sunflower (Helianthus annuus `Sunrich Yellow') as a test crop with potting media formulated from 3 aged pine bark: 2 sphagnum peat or compost: 1 vermiculite (by volume). Cropped and uncropped media in 350-mL pots were fertilized by subirrigation with complete nutrient solutions containing N at 2, 4, 6, 8 or 12 mmol·L–1 as ammonium nitrate. In control medium without compost, sunflower fresh mass increased linearly with increasing N. In one compost medium (C), growth was stimulated and with N at 6 mmol·L–1 was equal to growth with N at 12 mmol·L–1 in the control medium. With another compost medium (A), growth was inhibited and did not respond to increasing N. In medium C, saturated media extracts (SME) obtained before and up to 12 days after transplanting had higher concentrations of NH4 and NO3 than the control medium. In medium A, NH4 concentrations were similar to controls, but NO3 concentrations were lower. Nitrite concentrations were less than 0.2 mmol·L–1 and were highest in medium C. Nitrogen derived from compost in medium C substantially reduced the soluble fertilizer N requirement for sunflowers, while N immobilization by compost in medium A was not overcome by increasing fertilizer N.