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Mindy L. Bumgarner, K. Francis Salifu and Douglass F. Jacobs

mixing. The media treatments were mixed as a percentage by volume (sphagnum peat:perlite); they were 40:60; 60:40, and 80:20. The experimental design was a split-plot design with the irrigation method serving as the main plot factor and fertility and

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Richard V. Tyson, Danielle D. Treadwell and Eric H. Simonne

.5–9.0 ( Hochheimer and Wheaton, 1998 ); pH 8.5 ( Fig. 2 )]. Fig. 2. The effect of recirculating water pH on total ammonia nitrogen (TAN) loss from tanks with perlite medium trickling biofilters after being inoculated with nitrifying bacteria ( Nitrosomonas spp. and

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Kurt A. Schekel and Paul S. Kaczmarczyk

The presence of the growth regulators paclobutrazol and uniconazole in leachate or distribution through media consisting of various proportions of Douglas fir bark, sphagnum peat and perlite was evaluated. Distribution through a column 25 cm deep occurred rapidly and growth regulators were found in the leachate the first day after drench application when perlite was in the mix. Movement was limited to a maximum of the top 60% of the column in bark and peat mixes without perlite. Leachate was collected daily over a 12 day period after drenches were applied. Paclobutrazol and uniconazol showed similar distribution patterns in the media.

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Youbin Zheng and Mary Jane Clark

pots, 10 cm top and 6.8 cm bottom diameters) and thinned to one representative cutting per container once rooted. The growing substrate was a mixture of 80% Canadian sphagnum peat and 20% perlite (Therm-O-Rock East, New Eagle, PA). A 60-L batch of

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Menahem Edelstein, Meni Ben-Hur and Zui Plaut

pots containing perlite (no. 2; Agrical, Habonim, Israel), one seedling per pot, and were grown in a heated greenhouse at the Newe Ya'ar Research Center in northern Israel. Plants were irrigated with fresh water or treated domestic sewage water. Both

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Jared Barnes, Paul Nelson, Brian E. Whipker, David A. Dickey, Dean Hesterberg and Wei Shi

industry. This design allowed us to model substrate pH based on the ranges of the five nutrient factors used. Substrate formulation and liming. A 3 sphagnum peatmoss:1 horticultural-grade perlite (v:v) substrate (Sun Gro Horticulture, Bellevue, WA) was

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Rafael Urrea-López, Rocío I. Díaz de la Garza and Juan I. Valiente-Banuet

at ITESM facilities in Monterrey, N.L., Mexico (lat. 25°40′ N, long. 100°18′ W, altitude 430 m). Habanero pepper ‘Orange’ seeds (Seminis, St. Louis, MO) were established in 128-cavity trays filled with 2 sphagnum peatmoss:1 perlite (by volume). At 45

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W. Garrett Owen

amended with 20% (by volume) coarse perlite (PVP Industries Coarse Horticultural Perlite, North Bloomfield, OH), thus formulating (by volume) a 80:20 peat:perlite substrate. Substrate physical properties, including air space [(AS); % volume], total

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Chao Dong, Xue Li, Yue Xi and Zong-Ming Cheng

. The plantlets were prepared for transplanting into pots and by carefully washing the agar from the roots with sterile water, and then transplanted into the 1.5-L pots with sterile 6 vermiculite : 4 peat : 1 perlite growth medium. Transplanted plantlets

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Su-Jeong Kim, Chun-Woo Nam, Dong-Lim Yoo, Jong-Taek Suh, Myoung-Rae Cho and Ki-Sun Kim

This study was conducted to overcome the problems occurring in soil cultured Sandersonia, such as secondary tuber formation, tuber russeting, browning and surface cracking. For the tuber production, soilless culture medium compositions (peatmoss, perlite, cocopeat) and harvesting times [4, 6, 8, 10, and 12 weeks after flowering time (WAF)] were compared. The mother tubers were planted and grown in a plastic box (40 × 60 × 23 cm) under a PE film house with shading in summer season. The tuber number and weight were higher in peatmoss-based media of peatmoss, 1 peatmoss: 1 perlite, and 2 peatmoss: 1 perlite (by volume) than in the other media. Particularly, the plant height and the numbers of leaf and flower were also higher. The contents of total nitrogen and phosphorus in leaves were lower when the tubers were grown in perlite. Leaf area index per plant reached the maximum at 8 WAF and decreased thereafter. The optimal harvesting time for tuber production was 8-10 WAF.