Anthony Fulford

The Ohio State University, Wooster, United States · Environment and Natural Resources

The most recent fertilizer P and K rate recommendations for corn and soybeans grown in Ohio were last updated in the mid-90s. Research is needed to verify the appropriateness of these recommendations after 20 years. This study found that corn and soybean yield response frequencies to P and K fertilization did not differ much from expectations based...

Researchers across the Midsouth U.S. rice producing states of Arkansas, Louisiana, Mississippi and Texas set out to develop a soil-based N test in 2003, which could be used to determine site-specific N fertilizer rate recommendations for rice. The test has now been implemented.

Costs associated with rice production have continued to rise, primarily for N fertilizer. Current N fertilizer recommendations are based on a combination of three factors: soil texture, cultivar, and previous crop (Wilson, 2009). To improve N fertilizer management for Arkansas' rice producers, a stronger emphasis on the soil's ability to supply N s...

The recently developed Nitrogen-Soil Test for Rice or N-STaR requires a 0- to 45-cm soil sample to accurately predict the N fertilizer requirements of rice (Oryza sativa L.) produced on silt loam soils. Following its release questions were raised concerning the ability of rice to assimilate N from soil depths >30 cm. Therefore, a study was establis...

Corn ( Zea mays L.) yield under irrigated production systems is influenced by N rate and timing of application. This study was conducted to determine how current N application strategies (two‐way vs. three‐way split application) and N rate (optimal vs. suboptimal) influence fertilizer‐nitrogen recovery efficiency (FNRE) for furrow‐irrigated corn pr...

Soil test phosphorus (P) and potassium (K) and the associated soil test critical values (CSTVs) are widely used as the primary diagnostic tool to determine if a crop needs P and K fertilizer. However, identifying robust and predictive CSTVs requires a large number of field trials in representative soils and environments to assess crop fertilizer re...

Organic wastes diverted from landfills can reduce greenhouse gas emissions and are used as supplemental nutrient sources for agricultural crops after they are composted. In California, compost should be applied in the fall to processing tomatoes (Solanum lycopersicum L.) to avoid delaying field preparation and transplanting in the spring. The objec...

Context: Developing high-throughput methods to quantify soil health can support decision making to minimize soil constraints for crop growth and increase sustainability in agroecosystems. Objective: This study evaluated the ability of soil health assessment conducted at the beginning of the crop growing season to predict corn agronomic performance...

Supplemental fertilizer N recommendations for flood‐irrigated rice (Oryza sativa L.) have been developed with tests that quantify plant‐available N within the effective rooting depth. Alkaline hydrolyzable‐nitrogen (AH‐N) soil test methods were recently used to successfully guide supplemental fertilizer‐N management decisions of drill‐seeded, delay...

The Nitrogen‐Soil Test for Rice (N‐STaR) provides a site‐specific N rate recommendation by quantifying alkaline hydrolyzable‐N (AH‐N). A user‐friendly method for obtaining a representative N‐STaR soil sample is needed, and this study was designed to evaluate the performance of alternative sampling techniques compared with the Dutch auger (DA). The...

Soil testing and plant tissue nutrient concentrations form the basis for fertilizer recommendations in Ohio. The response of crop phosphorus (P) and potassium (K) nutrient concentrations to soil test levels and fertilizer applications influences fertilizer recommendations but have not been rigorously evaluated in this region. The objective of our s...

Off‐site transport of phosphorus (P) is a concern with Lake Erie and other Ohio surface waters. Baseline knowledge of and long‐term trends in soil test P (STP) and P balance are important as farmers are under increased scrutiny due to ongoing water quality concerns. The objectives of this work were to examine Ohio county‐level trends in STP, P inpu...

Field crop fertilizer recommendations for Ohio, Indiana and Michigan are currently based on the Bray P1 extractant for phosphorus (P) and the ammonium acetate extractant (AA) for base cations. The fertilizer recommendations in this Tri-State region are currently being revised and will use the Mehlich-3 soil test extractant as the new basis for P an...

Vegetables are a cornerstone of the human diet, and the importance of vegetables for human health and nutrition cannot be understated. Vegetables are susceptible to a number of biotic and abiotic stressors along with the cumulative pressure of climate change. Climate change is a major driver of the abiotic stress in modern-day vegetable production....

The Illinois Soil Nitrogen Test (ISNT) and the Nitrogen Soil Test for Rice (N‐STaR) are alkaline hydrolyzable‐N (AH‐N) soil test methods that can potentially improve N fertilization of cereal crops by predicting a site‐specific fertilizer‐N rate; however, neither method has been evaluated for rice ( Oryza sativa L.) grown on clayey soils. The study...

Core Ideas Corn and soybean yield seldom responded to P and K fertilization over 9 yr. Soil test P and soil test K significantly decreased from values initially in the recommended maintenance range. Corn Leaf P and Leaf K was often below the sufficiency concentration. Appropriate P and K fertilizer recommendations for corn ( Zea mays L.) and soybe...

A novel method was developed to inject 15N labelled ammonium sulfate into an undistrubed soil profile below a recently established rice plot. Following the establishement of a permanent flood, N was injected into the soil profile at depths of 30, 45 and 60 cm. Plant samples were taken at 50% heading to determine fertizer nitrogen uptake efficiency....

Urea is the most commonly used nitrogen (N) source in Arkansas rice production. Losses as ammonia can occur if fields are not flooded in a timely manner. If a flood cannot be established in a timely manner, a urease inhibitor is recommended. Recently, research has reported that relative humidity (RH) below the critical relative humidity (CRH) of ur...

Arkansas is the largest rice (Oryza sativa L.) producer in the United States; however, research assessing methane (GWP 25 times carbon dioxide) is limited. Currently, the EPA uses a methane emission factor of 5333 kg CO2-eq ha-1 regardless of management practices.The current study investigated the influence of previous crop [soybean (Glycine max L....

Hybrid rice (Oryza sativa L.) hectarage has increased substantially in the southern United States and necessitated research into the N nutrition of this new type of rice and how it compares to the traditional pure-line rice. Consequently, a study was conducted utilizing N-15-labeled urea applied at a range of N rates on two silt loam soils differin...