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Fluid Journal : Winter 2015
21 The Fluid Journal Winter 2015 Lint yield was not affected by P and K application rates at either location during 2013. At TAREC, lint yields were increased with the 2 x 2 band placement compared to the deep placement of P and K (Figure 6A). The 2 x 2 band produced 2,002 lbs. of lint at TAREC while the deep placement of nutrients yielded 1,858 lbs. of lint at TAREC. At Lewiston, lint yields with the 2 x 2 band were not significantly different from the deep placement system, however there was a 79 lb. lint difference between the two treatments, with 1,333 lbs. lint/ acre and 1,254 lbs. lint/ acre, respectively. No differences in fiber quality were observed between the 2 x 2 band and deep placement at either location (data not shown). Summing up The 2013 growing season in Virginia presented challenges to cotton producers. However, the lint yields were an exception for the study. Sand-burn injury at Lewiston introduced variability, which ultimately could not be overcome during the growing season. However, the injury did provide some data on nutrient status of cotton under early-season stress and this could be valuable to producers and consultants when making management decisions in the future. The TAREC data indicate that the 2 x 2 placement of a complete nutrient blend increased early-season growth. In areas such as Virginia, early-season vigor is extremely important in cotton production, due to temperature changes and insect pressure. The experiment also demonstrated that placing fluid fertilizers under the row with strip-tillage could be achieved and performance with this technique was similar to current nutrient management systems. When comparing the 2 x 2 band to deep placement, the 2 x 2 band increased early season growth and higher yields at TAREC during 2013. More data are needed to confirm the findings of the 2013 study, but preliminary results indicate that nutrients placed in banded zones, especially a 2 x 2 band, are equal to current nutrient management systems. Figure 6: Lint yield when phosphorus and potassium are placed in 2 x 2 band. Dr. Frame is Field Crops Agronomist in the Department of Crop and Soil Environmental Sciences, Suffolk, Virginia, and Austin Brown is Graduate Research Assistant in the Department of Crop and Soil Environmental Sciences, Virginia Tech. Figure 5: Lint yield and nutrient management systems at TAREC.