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Fluid Journal : Spring 2017
13 The Fluid Journal Spring 2017 Figure 1. Soil pH as reported by dish section and treatment. Table 2. Effect of pre-plant Potassium applications or rice grain milling quality. %ofsoiltestrecK applied Milling quality %Head/%Whole 2010 2011 0 50/61 66/73 50% 55/62 68/75 75% 56/63 69/75 100% 57/63 69/76 Mr. David Dunn is the Supervisor of the Soils Testing Laboratory at the University of Missouri-Fisher Delta Research Center in Portageville, MO., and Dr. Gene Stevens is Professor of Agronomy at the University of Missouri-Fisher Delta Research Center in Portageville, MO. Table 3. Stalk breaking strength in grams and lodging % for rice grown with pre-plant K treatments 2010 on a silt loam soil at Qulin, MO. Harvest was delayed to induce lodging. %ofsoiltestrecK applied Stalk breaking strength (g) Lodging (%) 0 70 30 50% 108 25 75% 125 20 100% 140 18 But by delaying harvest, lodging can be induced. However, with foliar applied K fertilization lodging was consistently reduced--even with adequate soil applied K. This amounted to reductions of 40% lodged to 15% lodged rice in one study. Stalk strength. These findings challenged us to develop a method for measuring rice stalk breaking strength. In the method we developed, weights were progressively added to a cup suspended on a rice stalk (Figure 1). The weight at which the stalk failed and the cup dropped was recorded. In this way, breaking strength was Kugler Company P.O. Box 1748 McCook, NE 69001 1-800 -445-9116 www.KuglerCompany.com www.KQXRN.com “AS YOUR BANKER, I STRONGLY RECOMMEND KQ-XRN LATER IN THE GROWING SEASON.” It is a proven fact. It is after the VT/RI stage that the grain in your crop needs critical nitrogen to optimize yield. The math is simple, apply 2 gallons of Kugler KQ-XRN per acre and increase yields by 20 bushel per acre. With today’s commodity prices, nobody can afford to leave 20 bu/acre on the table. Bankers, Crop Consultants and Producers throughout the Midwest are learning that spoon-feeding KQ-XRN to corn throughout the season turns an average crop into an outstanding crop. “Or You’re Fired!” NO LIMITATIONS ON HOW IT CAN BE APPLIED IN-FURROW SPRAYER IRRIGATION AERIAL 250 225 200 175 150 120 100 75 50 25 0 100 75 50 25 0 0 500 GDDF Seasonal Nitrogen Uptake Grow th Stage PercentofTotal(%) 1000 6 hybrids representing transgenic insect protection grow n in Champaign and DeKalb, IL, in 2010 with yields of 220-240 bu/ac 1500 2000 2500 VEV2V4V6 V10V14VT/R1R2 R4R5 R6 KQ XRN KQ XRN KQ XRN Grain Tassel, Cob, Husk Leaves Stalk and Leaf Sheaths Leaf Blades CriticaltimetoapplyKQ-XRNNUptake(lbNac-1) KQ-121M.indd 1 12/15/16 2:00 PM measured. This procedure was followed for 10 representative stalks from each plot. The stalk strength data strongly support the lodging data (Table 3). In order to confirm the relationship between stalk strength and potassium, the K content was measured for the individual stalks used in the strength analysis. A weak but positive relationship was found between stalk breaking strength and stalk K content (Figure 2). Summing up The need for proper K nutrition has become critical for modern rice production. The University of Missouri soil test recommendations for K in rice, have been evolving to meet this need. Our research, over the past 19 years, has shown that maintaining adequate soil K helps to maintain yield potential, while reducing lodging by increasing stalk strength.