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Fluid Journal : Winter 2017
5 The Fluid Journal Winter 2017 Increases wheat production in Idaho. Low Salt Fluid NPK Fertilizer The Fluid Journal • Official Journal of the Fluid Fertilizer Foundation • Winter 2017 • Vol. 25, No. 1, Issue #95 Enhancing early-season growth and extending NPK nutrient availability are essential parts of a good wheat fertilization program. Maintaining adequate P availability during the growing season can be a significant challenge because of calcareous soils. Orthophosphate can be tied up quickly, reacting with antagonistic cations in the soil, tying up the orthophosphate before it is taken up by plants. Simplot manufactures an ortho- poly (50/50) 6-24-6 low salt NPK fluid fertilizer that provides early-season P availability to crops, as well as enhanced P availability later in the growing season. Orthophosphate is readily absorbed by ▼ DOWNLOAD Summary: Wheat yields and crude protein increased as the 6-24-6 rate increased from 3to9GPA. Banding all of the fertilizer proved to be more effective than banding plus split foliar applications for increasing nutrient uptake and yield, although the differences in grain yield were comparatively small. plant roots and leaves, which enhances P fertilizer efficiency. Polyphosphates are initially protected from reacting with antagonistic cations in the soil because it is a long, less reactive chain and then in favorable conditions it hydrolyzes to orthophosphate, which is available for plant uptake. Low-salt NPK fluid fertilizers are safer for application with the seed at planting because of reduced salt impact on germination. They are also compatible with many micronutrient products for application at planting, placing the nutrients next to the seed to promote good wheat growth. Objective The purpose of this study was to evaluate the application of a low salt NPK fluid fertilizer either as a starter at planting or as a combination of starter + foliar application on hard red winter wheat (HRWW) and hard red spring wheat (HRSW). Methodology Soil. Whetstone hard red winter wheat (HRWW) and Cabernet hard red spring wheat (HRSW) were grown on a calcareous high pH sandy loam soil at the Aberdeen Research and Education Center, University of Idaho, during the 2014-2015 growing season. Soil test. Preplant soil test concentrations were 12-14 ppm NO3-N, 20-24 ppm P and 195 K. Drs. Galen Mooso, Terry Tindall and Jeff Stark Table 1. Rates for banded and foliar applications of 6-24-6 in the 2015 winter wheat and spring wheat studies. Treatment Banded 6-24-6 (gallons/acre) Foliar 6-24-61 (gallons/acre) Total P applied (lbs. P2O5/acre) N applied2 lb N/acre K applied lb K2O/acre 1 0 0 0 0 0 2 3.0 0 8 66 6 3 6.0 0 16 71 11 4 9.0 0 24 77 17 5 1.5 1.5 (2x0.75) 8 66 6 6 3.0 3.0 (2x1.50) 16 71 11 7 4.5 4.5 (2x2.25) 24 77 17 1Foliar 6-24-6 applications were split between equal amounts applied at tillering and booting growth stages 2Includes 30 lb N/acre topdressed at at tillering and 30 lb N/acre at boot stage.