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Fluid Journal : Winter 2018
Winter 2018 Dr. W. Hunter Frame is Field Crops Agronomist, Department of Crop and Soil Environmental Sciences, Tidewater Agricultural Research and Extension Center, Suffolk, Virginia 23437 N per acre, whereas at SHC lint yield decreased significantly from 50 to 100 lbs N per acre (Figure 11, bottom). The N application rate of 140 lbs N per acre did not significantly increase lint yields above the 100 lbs N per acre rate at any location. Both SHC and LEW showed a decreasing yield trend with N rate, and this was most likely due to dry conditions in August (boll fill period) at both locations followed by a period in late September/ October of cloudy rainy weather. This combination of weather events and N application rates delayed maturity of the cotton, resulting in high vegetative growth and low lint yields. Summing up In order to better understand the relationship between N and S physiology of cotton ratios of petiole nitrate-N to petiole S (PN:PS) and leaf N to leaf S (LN:LS), they were analyzed and correlated to yield. This analysis was only conducted for the data from Suffolk as it was the only statistically responsive site during 2016. The result of this analysis is a response surface regression found in Figure 12. Overall when PN:PS ratios are above 20, lint yields decreased at the Suffolk location and when the PN:PS ratio fell below 10, lint yields also decreased (Figure 12, left). When evaluating LN:LS, there was a similar trend in that when LN:LS ratios were greater than 10 and less than 7, lint yields declined (Figure 12, right). More data are needed to validate and build upon this one responsive site, however these ratios may be a likely way to evaluate the N and S status of Cotton during the first week of bloom. Lint quality characteristics were tested and significant responses to N and S treatments were sparse during the study. This will be another area where N and S fertility many impact cotton moving forward, but the data set is small on impacts of N and S fertility on lint quality in Virginia. The Fluid Journal, flagship publication of the Fluid Fertilizer Foundation (FFF), makes over two decades of archives available on its web site. The magazine investigates and informs its readers on innovative uses of fluid fertilizers under varied cultural, pest control, and water management practices, focusing on evaluating: • the agronomics of fluid fertilizer in the production of maximum economic crop yields • application techniques for fluid fertilizers • the efficiencies and conveniences of fluid fertilizer systems • methods of controlling environmental problems with fluids. Visit FluidJournalOnline.com to view the archives! Going on Twenty-Three Years of Archives!