Evaluation of Cotton Yield Response to Nitrogen Fertilizer Application across the US Cotton Belt

Nitrogen (N) is an important and one of the costly input of cotton production. Therefore, it is important to find out if current nitrogen fertilizer guidelines for cotton production are still valid across soil type, environmental conditions, cropping systems, and management practices. A multi-state project was started in 2020 to improve our understanding of soil biophysical properties in predicting cotton yield and quality response to N application rate. Nitrogen rate response trials were established in LA, MO, MS, NC, OK, SC, TN, TX, and VT in Randomized Complete Block Design with five N rates and four replications. Rates and sites were selected by based on the local conditions and history of previous positive cotton yield response to N applications. We are still waiting to get cotton yield results from all the sites. In this presentation, we will be provide pooled cotton yield response data to N rates from all the locations.