102067 Irrigation and Sidedress Nitrogen Management of Cotton in a Well-Drained Sandy Soil.

Poster Number 178-608

See more from this Division: SSSA Division: Soil Fertility and Plant Nutrition
See more from this Session: S4/S8 Ph.D. Poster Competition

Monday, November 7, 2016
Phoenix Convention Center North, Exhibit Hall CDE

Brendan A Zurweller, Agronomy, University of Florida, Gainesville, FL, Diane L. Rowland, G066 McCarty Hall D, University of Florida, Gainesville, FL, George Vellidis, GA, University of Georgia - Tifton, Tifton, GA, Michael J. Mulvaney, Highway 182, University of Florida West Florida Research & Education Center, Jay, FL, David L. Wright, North Florida Research and Education Center, Quincy, FL, Barry L. Tillman, North Florida Research and Education Center, University of Florida, Marianna, FL, Kati Migliaccio, Water Resource Engineering, University of Florida, Tropical Research & Education Center, Homestead, FL, Paxton Payton, USDA-ARS, Lubbock, TX and John Erickson, Agronomy Department, University of Florida, Gainesville, FL
Abstract:
North-Central Florida is characterized by entisol soils which have excessive permeability, resulting in the possibility of rapid soil water depletion or nutrient leaching following high intensity precipitation events. This results in the possible need for both supplemental irrigation and in season nutrient applications during a single growing season. The primary objective of this research is to assess the possible interactions between varying irrigation and side-dress nitrogen (N) applications in cotton. A field study was initiated in 2015 at the University of Florida’s Plant Science Research and Education Unit in North Central Florida (29° 24' 38" N, 82° 10' 12" W). Irrigation and sidedress N treatments were randomized in split plot arrangement with irrigation as the whole plot and sidedress N rates as the sub-plot. Irrigation treatments included: 1) 100% of plant available water (PAW) replacement; 2) a treatment consisting of 50% of PAW replacement until first flower and then 100% of PAW replacement; 3) 50% PAW replacement for the entire season; and 4) a rainfed control. Sub-plots consisted of NH4NOsource applied at first square and flower at 0, 22, 34, and 45 kg N ha-1 per application. In 2015, there was no irrigation by nitrogen interaction on lint yield, and irrigation applied relatively early in the growing season (< 60 DAP) also had no effect on lint yields. Sidedress N applications greater than 45 kg N ha-1 did not result in an increased amount of plant N uptake or lint yield. These results indicate that yield maintenance can occur with reduced amounts of early season irrigation, and sidedress N applications of 22 kg ha-1 at first square and first flower.

See more from this Division: SSSA Division: Soil Fertility and Plant Nutrition
See more from this Session: S4/S8 Ph.D. Poster Competition