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Fluid Journal : Fluid Journal 2008-2009
and availability to plants are low. In high pH (calcareous) soils, P reacts with Ca to form Ca-phosphate compounds. Soluble P controls the formation of Ca-phosphate compounds and the rates of their transformation from insoluble to soluble form, thus decreasing the plant availability of applied P in high pH soils. Phosphorus tends to be more strongly adsorbed or precipitated as insoluble Ca-P minerals in high pH soils, whereas in acid soils, insoluble Al and Fe products dominate. Thus, to improve P efficiency, what is required is a fertilizer with a great rate of P diffusion and a supply of P that remains available to the plant under these conditions. Plant roots also play an important role in exploring P for uptake in moist soils. Another study applied technical grade MAP in fluid and granular forms to a highly calcareous soil (67% free CaCO3). The results indicated that P diffused to a greater distance and remained in a more available chemical form when MAP was applied in fluid form. Yet another study showed that about 12 percent of the P from granular MAP remained in granular form five weeks after application, suggesting that a significant fraction of water soluble P had been converted to an insoluble form. This further suggested that the greater ability of fluid forms of P to improve growth and P uptake of wheat was a result of decreased rates of chemical ’fixation’ of P in the Now on the Internet and Cataloged All articles published in the Fluid Journal. Click on and pass on valuable information to your customers! www.fluidfertilizer.com soil (available chemical form) and increased mobility (diffusion rate) of P compared to granular forms. In terms of economics, breakeven point for fluid P in wheat yield increase ranged from 5 to 17 percent (Table 2). Thus, if crop yield benefit was consistently obtained, application of fluid P could be profitable in WA. Matt Evans is northern regional manager with CSBP Wesfarmes in Kwinana, W.A . Table 2. Approximate prices of a range of fluid P fertilizers compared with granular P and the breakeven wheat yield increase required to cover the cost of fluid P. Fertilizer $/tonne Cost $/ha Break even yield increase (%) Granular 497 26.16 Phosphoric acid 800–1,500 41.48-67.59 6.2 -16.7 APP 842-1,029 57.51-68 .93 12.7-17.3 Liquid NP 380 37.10 4.4 TGMAP 800-1,200 37.59-52 .40 4.6 -10.6 22 Fluid Journal WI NTER 2008 Welcome and thanks! The Fluid Fertilizer Foundation New member since August, 2007: Sustainable Liquid Technology Pty Ltd Companies increasing pledges: Hunter Agri-Sales, Inc. Active Minerals International Murray Equipment, Inc. AgriFocus Incorporated Mineral Research and Development Hintzsche Fertilizer, Inc. Lortscher Agri Service, Inc. The Reactor Inc. Mid-State Tank Co., Inc.
Fluid Journal 2005-2007