Sulochana Dhital1, William Raun2, Jeremiah Mullock1 and Bee Khim Chim3, (1)Plant and Soil Science, Oklahoma State University, Stillwater, OK (2)Plant and Soil Sciences, Oklahoma State University, Stillwater, OK (3)Oklahoma State University, Stillwater, OK
Optimum use of nitrogen (N) is a key component in improving wheat grain yield and quality. The combined effect of other nutrients with N can have a positive impact on crop production. Use of sulfur (S) and chloride (Cl) with N is considered to be effective in optimizing wheat grain yield and grain protein. Two field experiments were conducted to determine whether the application of the different rates of foliar N and S in addition to Cl at pre- anthesis could have a synergistic influence on winter wheat grain yield and quality. Two N rates, 10 and 20 kg N ha-1, in the form of N-SURE containing urea triazone (28-0-0) and UAN (28-0-0) will be foliar applied. Treatments will also include foliar application of Ammonium sulfate (6 kg S ha-1) at Feekes 10.1 growth stage. Calcium chloride will be applied to 4 plots of each rep and half of rep 4 at a rate of 10 kg Cl ha-1. Normalized difference vegetative index (NDVI) readings will be collected at Feekes growth stages 5, 7, and 10 from all plots. Results should show that pre-anthesis foliar applied S and Cl in addition to N fertilization increases wheat grain yield and grain protein concentration.