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Fluid Journal : Summer 2015
10 The Fluid Journal Summer 2015 phase (nutrient remobilization and reproductive nutrient uptake) • Quantify the effect of diverse production systems in biomass and yield. Site characteristics Soil type at the Ottawa location was a Woodson silt loam. Rossville was an Eudora sandy loam. Scandia was a Crete silt loam. Soil samples were taken before planting at Scandia and Ottawa to a total depth of 6 inches. Pre-season soil test results show contrasting features at the locations evaluated. The parameters ▼ DOWNLOAD analyzed were pH, Melich P, cation exchange capacity (CEC), organic matter (OM), and K availability (Table 1). Experimental design. The study was conducted in field plots measuring 10 feet wide by 50 feet long at all locations. Each treatment was replicated five times in a randomized complete block design. The sorghum hybrid used was NK7633 (Sorghum Partners), a medium-full maturity, with excellent standability, stay- green and high yield potential. Eleven treatment combinations evaluated the effect of balancing nutrients and production practices for sorghum production (Table 2). Treatment 1 was the high-intensive use of these input combinations: “kitchen sink” with narrow-row spacing (15”), optimum plant population (40,000 to 50,000 pl/A), application of N using GreenSeeker technology, micronutrients, plant growth regulator (PGR), fungicide/insecticide, starter fertilizer (PK), and chloride application. Treatment 10 was the low-input treatment (“common farming practices”) with wide row spacing (30”), lower plant population, and with a standard N application (planting fertilizer N application). Fertilizer N was applied pre-planting at each location using an anhydrous ammonia source. Further Table 1: Pre-plant soil characterization at 0-6 inch depth at Rossville and Scandia sites Soil parameters Rossville Scandia Buffer pH (SMP) 7.4 6.6 Mehlich P (ppm) 22.7 27.2 Summation CEC (meq/100g) 5.6 28.5 OM (%) 1.2 2.8 K (ppm) 102.3 614.7 Table 2: Treatment description for all sites evaluated during the 2014 growing season #All nutrients were applied at planting time, except for the extra N diagnosed via GreenSeeker technology (V5-V8 growth stage). Table 3: Fertilizer application, nutrient amount, expressed in lbs per acre