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Fluid Journal : Fluid Journal 1993-1995
and accurately meter homogeneous nutrient solutions means that many new and developing application technologies must involve fluid fertilizers. PIFA has enjoyed engineering and field research in both Europe and North America over the past 10 to 15 years. Agronomic performance data remain encouraging, particularly as more crops over a wider geographic and climatic range are tested. It is the integration of modern crop agronomy with substantial advances in engineering, material, and computer sciences, however, which still makes fertilizer application a dynamic research area. Future Currently available PIFA technology focuses on the spoke wheel and will likely continue to do so. Ongoing field experience can only enhance spoke wheel engineering, durability, economics, and agronomics. Studies of crops other than those mentioned in this article will need to evaluate the economic and environmental benefits of PIFA, along with the other placement options such as the pressure injector/thin profile coulter combinations. Irrespective of fertilizer form, application technology must keep pace with agronomic advances and must also meet the following three criteria: 1) it works, 2) it is durable, and 3) it is not cost prohibitive to the grower. Paul Belzer is Manager, Agronomy for J. R. Simplot Company, Pocatello, Idaho. 3 Fluid Journal Winter 1994
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