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Fluid Journal : Fall 2015
14 The Fluid Journal Fall 2015 these soils, the contribution of P from the soil was minimal due to the low P availability. For the calcareous soil, the contribution of P from the fertilizer ranged from 15 percent for TSP to 48 percent for flMAP. The greater TSP efficiency in the Chile soil may be due to an effect of Ca nutrition. In the Redvale soil the TSP appears to be the worst fertilizer option. Summing up This study demonstrates that in acidic and oxide-rich soils where the availability of P is restricted by strong adsorption reactions, fluid P fertilizer did not provide any additional advantage over granular Plant response to fertilizer sources: wheat plants grown for 6 weeks in Andisol, Chile (A) and Oxisol, Redvale (B). sources to plant growth. In contrast, the fluid P fertilizer was highly effective in the calcareous soil, in agreement with previous studies. The chemical properties of the soils need to be considered prior to the selection of P fertilizers as they play a vital role in the fate of P in soils. The management of P nutrition in soils that strongly adsorb P is very challenging because a very high P rate is needed in order to obtain adequate yields, but care should be taken to minimize the negative impacts that over-fertilization can cause to the environment. Dr. Daniela Montalvo is Postdoctoral Research Fellow at University of Adelaide, Dr. Fien Degryse is Senior Research Fellow in Soil Science at the University of Adelaide and Dr. Mike J. McLaughlin is a Research fellow at CSIRO Land and Water, and Professor in Soil Science, at the University of Adelaide, Australia. ACT NOW! Write, call or e-mail the Fluid Fertilizer Foundation Phone: 785-776-0273 E-mail: email@example.com Research and education for efficient use of fluids. The Fluid Fertilizer Foundation We need you to join hundreds of other growers, dealers, fertilizer manufacturers and other supporting industries JOIN IN THE SUPPORT OF THIS ORGANIZATION THAT DIRECTLY BENEFITS YOUR BUSINESS!