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1. Evaluation of N Source in No-till Winter WheatNitrogen (N) source efficacy is dependent upon product used, application timing, and the condition of the environment in which it is placed. This study serves to look at how different N sources can be affected across different regions of Oklahoma, specifically in a heavy residue, no-till environment. N sources that were included in the study were Urea, Urea-Ammonium Nitrate (UAN), UAN + Anvol, and SuperU. The N sources were evaluated across nine site-years (SY) where each product had four... J. Derrick, B. Arnall, M. Smith, J. bigatao souza |
2. Monitoring Nitrogen Transformations and Their Interaction with Potassium Uptake in Cotton Production SystemsUnderstanding the temporal dynamics of soil nitrogen (N) is critical for optimizing nutrient management in cotton production. This research monitored soil N transformations, specifically ammonium (NH₄⁺) and nitrate (NO₃⁻), throughout the cotton growing season. An additional focus was also placed on interactions between soil N forms and the uptake of essential plant nutrients, particularly potassium (K). Soil samples were collected at multiple depths and time points across different management... J. Derrick, B. Arnall, N. Mathey, B. oliveira liberato, C. Camacho |
3. Maize Response to Nitrogen and Sulfur Fertilization RatesDue to reduced atmospheric deposition and advancements in agronomic management, sulfur (S) deficiency has become an increasing concern in maize production systems. Because S plays a fundamental role in nitrogen (N) metabolism, S availability may influence maize yield response to N fertilization. This study evaluated maize response to N and S fertilization rates across six locations in Oklahoma. Field experiments were conducted using a randomized complete block design with 14 treatments and four... N. Mathey, J. Derrick, B. Arnall |