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John A. Biernbaum and Natasha Bos Versluys

Important components of water management for transplant production include water quality, the frequency and volume of water application, and the method of application. Water quality factors of concern are alkalinity, soluble salts including sodium absorption ratio (SAR), and ions at potentially toxic concentrations including boron and fluoride. The available water in individual transplant cells is influence by container size and geometry, medium particle size, medium moisture release characteristics, and wetting agents but is primarily determined by irrigation frequency and the amount of water applied at each irrigation. Irrigation scheduling can be done using several methods but is influenced by the crop stage, the water volume applied, and the frequency of drying desired. Transplants can be watered by hose and breaker, stationary sprinklers, traveling boom sprinklers, fog nozzles, or subirrigation. The outcome of experiments testing effects of transplant size, transplant age and fertilizer rates are all influenced by water management.

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L.R. Parsons and T.A. Wheaton

38 Colloquium 1 (Abstr. 700–705) Water Management and Water Relations of Horticultural Crops

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Kathryn M. Santos, Paul R. Fisher and William R. Argo

much higher than in large containers. Based on the variability in growing practices within the industry, management practices need to be evaluated and critical areas such as the amount of water and nutrients lost should be quantified to determine points

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Gregory S. Hendricks, Sanjay Shukla, Kent E. Cushman, Thomas A. Obreza, Fritz M. Roka, Kenneth M. Portier and Eugene J. McAvoy

. Water table management has a direct and profound impact on soil moisture and nutrient concentrations in the root zone. Either wet or dry soil moisture conditions can adversely impact crop yield, but water management can also cause low or high nutrient

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S. Shukla, C.Y. Yu, J.D. Hardin and F.H. Jaber

The lysimeter project was funded through the Southwest Florida Water Management District and the South Florida Water Management District. Thanks are also due to Mr. Saurabh Srivastava, graduate research assistant, for his help. The use of the

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Amy L. Shober, Geoffrey C. Denny and Timothy K. Broschat

quality degradation (e.g., eutrophication). Various best management practices (BMPs) have been developed and implemented in an effort to reduce environmental pollution and water consumption associated with urban landscapes. Recommended BMPs include

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Carolyn DeMoranville

contributor to the nutrient pollution, a limit is set on the amount of N or P that can leave the farm and move into the impaired water body. Therefore, in addition to considerations of crop need, nutrient management, particularly that for N and P, must include

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Richard O. Carey, George J. Hochmuth, Christopher J. Martinez, Treavor H. Boyer, Vimala D. Nair, Michael D. Dukes, Gurpal S. Toor, Amy L. Shober, John L. Cisar, Laurie E. Trenholm and Jerry B. Sartain

impaired by high nutrient concentrations require water quality management plans outlined by the Total Maximum Daily Load Program [ Florida Department of Environmental Protection (FDEP), 2009 ; U.S. Environmental Protection Agency (USEPA), 2010 ]. Under the

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T.K. Hartz

Many factors influence appropriate drip irrigation management, including system design, soil characteristics, crop and growth stage, and environmental conditions. The influences of these factors can be integrated into a practical, efficient scheduling system that determines quantity and timing of drip irrigation. This system combines direct soil moisture measurement with a water budget approach using evapotranspiration estimates and crop coefficients.

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John C. Majsztrik and John D. Lea-Cox

group within this committee is to inform the Chesapeake Bay modelers about how the model can be adapted to better model the inputs and practices used by greenhouse and nursery operations. In Maryland, specific water and nutrient management information is