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Fluid Journal : Fall 2013
11 The Fluid Journal Fall 2013 Table 1. Mean tomato leaf sample analysis on samples collected on July 5, 2012* N P K GSP 5.02 0.52 3.30 GSP + N-N 4.97 0.49 2.95 90% GSP + N-N 4.68 0.49 3.40 *Tomato leaf sufficiency range for N=3.5-4.5, P=0.25-0.41, K=2.0-3.0 Table 2. Mean tomato leaf analysis on samples collected on August 13, 2012* N P K GSP 5.59 0.46 2.59 GSP + N-N 5.52 0.44 2.40 90% GSP +N-N 5.77 0.46 2.41 *Tomato leaf sufficiency range for N=3.5-4.5, P=0.25-0.41, K=1.6-3.1 Table 3. Effect of NutriSphere-N on economics of subsurface drip tomato production. Total N Applied Lb N/A Total yield Tons/A Color Score % Solids Total return @$69.40/ ton Nutri- Sphere-N Benefit GSP 200 64.2 23 4.9 $4,455.50 GSP + N-N 200 68.4¹ 22.4 4.9 $4,747.00 $281.50 (+$10/A) (29:1) 90% GSP + N-N 180 68.2¹ 22.9 5.0 $4,733.00 $280.50² (+$10/A) (29:1) 1Harvest yields represents 2 x 2.0 acre plots 2Includes a N cost savings of $12.50 per acre based on UAN-32 = $400/ton. Dr. Mooso is the Agronomy Manager for the J.R. Simplot Company and is a member of the Fluid Fertilizer Foundation (FFF) R and E Committee. Dr. Tindall is Senior Agronomist for the J.R. Simplot Company in Boise, Idaho and is also a member of the FFF Board of Directors and its Fluid Journal Editorial Committee. green, and cull segments and weighed to determine yield. Summing up Yield. Based on the random hand samples taken on September 25, 2012, N-N and the 90 percent GSP+N-N treatments increased yield over the grower standard practice by 16 percent. The random hand samples very closely predicted the commercial harvest yield for the N-N treated plots at 68 tons/A of yield. The random hand samples harvested were sorted into red, yellow, green, and culls. Looking at the segmented yields, the N-N treatments increased the yields of red tomatoes by 8 tons/A. The green + yellow yield was similar for all treatments at approximately 8 tons/A. These results show that the N-N treatments increased the amount of red tomatoes over the grower standard practice. Commercial harvest. Tomatoes were harvested on October 6, 2012 by a contract harvest crew. NutriSphere-N treated plots were harvested separately and tracked through processing to determine the effect of NutriSphere-N compared to the Grower Standard Practice and a 10 percent reduction of N with NutriSphere-N compared to the Grower Standard Practice. The N-N plots were harvested separately from the rest of the field by commercial harvest equipment on October 6. The commercial harvest economic information is presented in Table 2. Nutrisphere-N increased total yield by 6.5 percent over GSP while reducing the total amount of N by 10 percent with NutrisSphere-N increasing yields by 6.2% compared to GSP. Return. Both NutriSphere-N treatments provided an improved economic return to the grower without sacrificing any tomato color score or solids. Based on a contracted return of $69.40/ton, both NutriSphere-N treatments yielded a 29:1 benefit to cost ratio; this meant that for every $1 invested in the NutriSphere-N the grower received a $29 increase in revenue (Table 3). ACT NOW! JOIN IN THE SUPPORT OF THIS ORGANIZATION THAT DIRECTLY BENEFITS YOUR BUSINESS! The Fluid Fertilizer Foundation • 2805 Claflin Road, Suite 200, Manhattan, KS 66502 Write, call or e-mail the Fluid Fertilizer Foundation Phone: 785-776-0273 • E-mail: email@example.com Research and education for efficient use of fluids. The Fluid Fertilizer Foundation We need you to join hundreds of other growers, dealers, fertilizer manufacturers and other supporting industries
Late Spring 2013