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Stephanie A. Beeks and Michael R. Evans

times and are often grown on subirrigation systems such as ebb-and-flood benches or flood floors. Therefore, the objective for this research was to evaluate the growth of a long-term greenhouse containerized crop in biodegradable containers compared with

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Kranti Macherla and Richard J. McAvoy

and reuse runoff. In closed subirrigation systems such as those used in controlled-environment agricultural production for example, water is taken up by capillary action through the base of the production container, and unused water is drained back

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Chad T. Miller, Neil S. Mattson, and William B. Miller

, boom, drip) and subirrigation (e.g., ebb and flow) are two irrigation methods commonly used in the greenhouse industry and each system has advantages and limitations. A major advantage to overhead irrigation compared with subirrigation is the ability to

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George C. Elliott

A schematic diagram and parts list is presented for a simple and inexpensive system for pulsed subirrigation (commerically referred to as ebb and flow or flood and drain). The system can be readily modified for flowing solution culture. It has proven useful in teaching and research applications. It can be assembled from readily available parts using hand tools.

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J. Million, J. Barrett, D. Clark, and T. Nell

Trials involving growth retardants applied in subirrigation water were conducted to evaluate the potential for this method of application and to determine critical concentrations for production of several floriculture crops. Eight concentrations of paclobutrazol or ancymidol ranging from 0 to 0.1 mg·liter–1 were applied continuously (from planting) to five crops. Based upon regression equations, paclobutrazol concentrations resulting in 20% size reduction were 0.005, 0.024, 0.017, >0.1, and >0.1 mg·liter–1 for begonia, chrysanthemum, impatiens, petunia, and salvia, respectively; for ancymidol, respective concentrations were 0.003, 0.01, 0.10, >0.1, and 0.058 mg·liter–1. A second set of trials compared the efficacy of a one-time vs. continuous application of paclobutrazol via subirrigation starting at 2 to 3 weeks after planting. For begonia, a one-time subirrigation application of 0.01 mg·liter–1 paclobutrazol resulted in 30% size reduction, while 0.003 mg·liter–1 applied continuously resulted in 20% size reduction. For impatiens, a one-time subirrigation application of 0.1 mg·liter–1 paclobutrazol resulted in 31% size reduction while 0.03 mg·liter–1 applied continuously resulted in 40% size reduction.

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Youssef Rouphael and Giuseppe Colla

been developed for containerized crops. The most widely used are the surface system (drip irrigation) and subirrigation systems (ebb-and-flow benches, capillary mats, trough benches, and flooded floors) ( Reed, 1996 ). In drip-irrigated culture, water

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Michele Krucker, Rita L. Hummel, and Craig Cogger

Gawel, 2004 ). Reducing water and fertilizer use and managing leachate are also key to sustainable container production systems ( Biernbaum, 1992 ; Uva et al., 1998 ). Research has demonstrated the efficiencies of subirrigation with recirculation in

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Takafumi Kinoshita and Masaharu Masuda

Efficient nutrient use in greenhouse vegetable production is essential for both economic and environmental reasons. In general, nutrient and water utilization efficiency is higher with subirrigation than with drip irrigation, because subirrigation

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Rachael E. Pepin and Janet C. Cole

al., 2001 ). In addition to the variety of plant growth regulators available, alternative application methods are being developed and added to product labels. Subirrigation occurs when water is applied to plants by ebb-and-flood irrigation or by

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N.S. Khoury, E.J. Holcomb, J.W. White, and M. Rand

Recycled subirrigation systems are a possible solution to grower concerns over water use, ground water pollution, and regulations concerning these. The objectives of this experiment were to examine the differences between top- and subirrigated plants, with different fertilizer regimes and with mulches.

Six treatments of `Crimson Fire' and `Victoria' CVI geraniums were grown in 11 cm. pots. Treatments were: top irrigation, 100% N supplied with 20-10-20 soluble fertilizer; subirrigation, 100% N supplied with 20-10-20 soluble fertilizer; subirrigation, N supplied in equal portions of 20-10-20 soluble fertilizer and CRF, gel mulch; subirrigation, N supplied with CRF, gel mulch; subirrigation, N supplied in equal portions of 20-10-20 soluble fertilizer and CRF, wool mulch; subirrigation, all N supplied with CRF, wool mulch.

`Crimson Fire': fresh weight was not significantly different between top- and subirrigation; fresh weight at the same fertilizer level was not significantly different with either a gel or a rockwool mulch; all CRF resulted in the lowest fresh weights. `Victoria': top irrigated fresh weight was significantly higher compared to subirrigated. Gel mulched plants resulted in significantly lower fresh weights than wool mulched plants. All CRF resulted in the lowest fresh weights.