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Fluid Journal : Summer 2016
4 The Fluid Journal Summer 2016 Maintaining adequate P availability is imperative. The Fluid Journal • Official Journal of the Fluid Fertilizer Foundation • Summer 2016 • Vol. 23, No. 3, Issue #93 Alow salt 6-24 -6, developed in the western U.S., is a 50-50 blend of both ortho-poly phosphates developed to provide both improved early season P availability to crops as well as enhanced P availability later in the growing season. It is highly soluble and the orthophosphate is readily absorbed by plant tissue when applied as a foliar spray. This application has been recommended to help enhance P fertilizer efficiency. The polyphosphate-P is initially protected from being tied up by soil cations, but when conditions are favorable (warm soil) it is hydrolyzed to release orthophosphate, which is immediately available in the right source for plant uptake. In addition, 6-24 -6 has a relatively low index, which allows it to be applied closer to the seed than many conventional fertilizer sources. It is also compatible with a wide array of micronutrient solutions and can be easily blended to ▼ DOWNLOAD Summary: Potato production requires adequate nutrients provided throughout their entire production profile, including high-concentrated fluid starters applied at planting. Providing these enhanced early-season and extended Nitrogen- Phosphorus-Potassium (NPK) available and soluble fertilizers is an essential part of any potato fertilizer program. It is imperative to maintain adequate P availability over the course of the growing season and can be a significant challenge. This is particularly important in calcareous soils where orthophosphate can be quickly tied up by soil cations of calcium (Ca) and magnesium (Mg), rendering P less available to the crop. provide an excellent source of macro- and micronutrients. Field trials This report is meant to be a preliminary industry update and is designed to only look at the trends of the research within some of the critically measured metrics. Complete statistics are not provided at this time, but will be in a follow-up report. Goal. The University of Idaho conducted field evaluations on irrigated potatoes at two locations and over the 2014-15 growing season with one additional year currently established. The goal of these trials is to determine the effective placement, timing, rate, and source of low salt fluid starters of 6-24 -6 (produced by the J.R. Simplot Company). Low salts in this case are being defined as sources of fluid fertilizers that use potassium hydroxide as the K source, which effectively reduces the fertilizer material’s salt index, allowing greater concentrations to be made in direct contact with the potato seed piece. These trials were conducted at Aberdeen, Idaho’s R and E Center by Dr. Jeff Stark, and by Dr. Mike Thornton at the Parma R and E Center located in Parma, Idaho. 4R’s. Treatments for this potato study were conducted on medium soil testing Pof17-20ppmwithasoilpHof7.5to 8.0 and classed as silt loam with percent free lime of less than 5 percent. All of these are factors that would relate to an expected P-based low salt fluid like 6-24 -6 fertilizer being used in potato production. Trials were established where the 4 R’s of fertilizer were incorporated within the study. These include timing (6-24 -6 applied either at planting or in-season or split applications between both timings), rate (applications of the 6-24 -6 were applied at 3, 6, 9, and 12 gallons/acre) and placement (in- furrow or foliar). The 6-24 -6 poly/ortho blend was not meant to be a stand-alone fertilizer treatment but as a supplement Drs. Terry Tindall and Galen Mooso Low Salt Fluids and Irrigated Potatoes