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Influence of nitrogen timing on winter wheat grain yield and evaluation of nutrient management on the stratification of soil parameters in no-till
(2021-12)
Visual symptoms of nitrogen (N) deficiency is common in winter wheat fields. Whether it is due to unavailability of suitable application equipment or unfavorable application conditions, the crop may go a significant period ...
Investigating avenues of increasing nutrient use efficiency in soybeans and winter wheat in Oklahoma
(2021-05)
A large part of the land-grant mission is to increase production and sustainability in growing crops to feed and clothe our world. One aspect that allows us to get closer to obtaining our goal is to increase our nutrient ...
Improving winter wheat grain yield and nitrogen use efficiency using nitrogen application time and rate
(2020-12)
Preplant nitrogen (N) application which involves placing nutrients in the soil prior to seeding has been an integral part of crop production systems for decades. Some producers are known to apply N at least 21 days before ...
Effect of preplant nitrogen and phosphorus application method and source on sorghum (Sorghum bicolor L.) grain yields
(2021-05)
Nitrogen (N) losses can occur with different fertilizer sources and methods of application. Both N and phosphorus (P) are essential macronutrients for cereal production; however, there is little research done to demonstrate ...
Evaluation of management strategies for continuous forage production in central Oklahoma
(2021-12)
Forage production in the southern Great Plains is an important aspect of the agricultural industry because forage is used to feed livestock that produce many agricultural products that are consumed. A goal of agricultural ...
Tillage system impact on soil health and weed management
(2023-05)
The first chapter of this dissertation involves two studies that were conducted from 2022-2023 to determine the impact of sweep tillage on soil health and management of tumble windmill grass (Chloris verticillata). The ...
I. Optimum sulfur application for soybean (Glycine max) in OklahomaII. Influence of preplant and topdress nitrogen on winter wheat (Triticum aestivum) grain yield
(2020-05)
Soybean (Glycine max) are a vital legume crop present in the United States with substantial nutritional value and oil content. In 2017, 36,421,707 ha of soybean were harvested in the US (USDA, 2017). As soybean markets ...
Maize grain yield response to misses as influenced by nitrogen and plant populationWinter wheat grain yield response to potassium in two long-term experiments
(2020-12)
Maize (Zea mays L.) grain yield decline under low-input production environments has been linked to different kinds of management practices. The impact of plant spacing and plant population on grain yield has been well ...
Improving nitrogen use efficiency, soil properties and grain yield of maize (Zea mays L.) and winter wheat (Triticum aestivum L.) with biochar and no-tillage practice
(2020-12)
The first study (chapter 1) of this dissertation was conducted to establish possible synergies in applying inorganic fertilizer nitrogen (N) in combination with biochar (NBC) and the subsequent role in optimizing maize ...
Spatial and temporal patterns of soil moisture: A study on soil moisture observation and modeling
(2020-05)
This dissertation addressed three research questions related to observing and modeling soil moisture spatial and temporal patterns. 1) What is the spatial pattern like for soil moisture at the mesoscale? A mobile device ...