Master of Science / Department of Agronomy / David B. Mengel / Research has shown that nitrogen fertilizer is needed most years to optimize winter wheat yields in Kansas. Anhydrous ammonia (AA) has long been a favorite N fertilizer of producers as it has proven to be a reliable and economical source of N. Anhydrous application methods and equipment have changed little over the past 70 years. Recently John Deere has developed their 2510 HSLD (2510H) anhydrous ammonia applicator designed to improve efficiency and performance in no-till systems. The 2510H is designed to be run at high speed with low soil disturbance and low draft. This is achieved by using a rolling coulter type injection unit, designed much like modern single disk opener grain drill units, to apply AA at relatively shallow depths. With this low soil disturbance design, topdress AA applications may also be possible. Due to the environmental risks associated with wheat production, many Kansas producers prefer an N management system that consists of a “starter” application at planting with the majority of the N fertilizer applied in the spring. This approach makes certain that the crop survives the winter before the investment in N is made and eliminates the potential for fertilizer N being lost over the winter months. It has not been feasible to use AA for topdressing in the past due to the damage to the growing crop from application with traditional knife style applicators. The first part of this research revisits traditional preplant AA application methods by evaluating proper unit spacing and the use of nitrification inhibitors as well as comparing these AA treatments to common topdress applications of N. Over three site years, few consistently significant advantages between unit spacing, use of nitrification inhibitor or N management method were found. Unit spacing did show a notable trend favoring 50 cm spacing. The second part of this research was a two-year experiment conducted with the objective of assessing the feasibility of topdressing with AA using the 2510H as compared with topdressing with granular urea. A number of factors such as application direction in relation to crop row, speed of application and timing as a function of crop development were examined to minimize crop injury and maximize crop yield. The initial 2010 study was promising, showing no significant yield loss topdressing with AA compared to topdressing with urea. The experiment was repeated at two locations in 2011. Results were mixed, indicated that soil conditions and the plants ability to recover from the AA application injury were important for the success of topdressing with AA. Lastly, an economic evaluation of the production economics of preplant and topdress AA was compared to the traditional practice of topdressing winter wheat with urea. Through evaluation of the agronomic and economic factors affecting the feasibility of uses of AA and the 2510H, three main conclusions can be made: 1. Preplant application of AA has no agronomic advantage and only a small economic advantage over topdressing with urea when yields are the same. 2. Topdressing with AA is agronomically feasible but is at an economic disadvantage when compared to topdressing with urea, due to the yield reduction associated with the AA method. 3. Further research focused on reducing yield loss with topdress AA applications is needed before this N management strategy can be promoted on a large scale.

Master of Science / Department of Agronomy / David B. Mengel / Anhydrous ammonia (AA) is one of the most commonly used nitrogen (N) fertilizer sources for corn (Zea mays L.) in the US. Traditional knife applicators are slow, have high power requirements and create substantial soil disturbance. Thus, there is considerable interest in high speed, shallow placement, and low draft AA applicators like the newly introduced JD 2510 series, particularly for no-till production systems. The objective of this project was to compare a prototype high speed, low draft applicator (JD) with a traditional knife type AA applicator (TRAD) for irrigated and dryland corn production in the Kansas River Valley. Field studies were conducted from 2007 through 2009. Six N rates ranging from 0 – 224 kilograms N per hectare, in 45 kilogram increments, were applied at 3 application timings, Fall (FALL), Preplant (PRE), and Sidedress (SD) with both type applicators. Gaseous AA emissions were collected over a seven to nine day period after each application for both the TRAD and JD applicators for all application timings. The impact of applicator, timing and N rate was also measured on plant stand, earleaf N content, total N uptake, nitrogen use efficiency and grain yield. Statistically higher post application losses of ammonia at high N application rates were seen at all application timings with the JD applicator. However, these N losses were not of agronomic significance, and did not affect grain yield in 2007 or 2008. In 2009, there did appear to be a significant difference between applicators in grain yield, however this was primarily due to a significant yield decrease at the JD SD 224 kilograms N per hectare treatment from high application loss and resulting plant tissue damage. A significant response to N application was seen every year. Optimum N rate varied between years. FALL and PRE treatments had significantly higher grain yield than SD applications in 2008. However, in 2009 there was no significant difference in N application timing.

Master of Science / Department of Agronomy / David B. Mengel / World population, together with the cost of crop production inputs, is increasing rapidly. The current seven billion people on earth are expected to reach nine billion by 2050 with resulting demands on world food production. In addition, the quality of our environment is being impacted by human activities, including agricultural production and crop fertilization. Nitrogen (N) management is the process of applying N fertilizers in a way to maximize use of N by crops, while minimizing loss to the environment. It is becoming imperative, as a means of increasing crop yields and food supplies, while reducing input usage, and minimizing the impact of N fertilization on the quality of our environment, that improved N application practices be identified and utilized. The objectives for this study were to compare the timing of anhydrous ammonia (AA) fertilizer N applications, fall and spring, with and without two different nitrification inhibitors (NI) as possible tools to enhance yield and Nitrogen Use Efficiency (NUE) in corn (Zea mays) and winter wheat (Triticum aestivum L.) in Kansas. Two different nitrification inhibitors were tested as alternatives, N-Serve (nitrapyrin) produced and marketed by Dow AgroSciences, and an experimental product under development by Koch Agronomic Services LLC. Three differing rates of the experimental product were used to assist in determining the optimal rate for this product. The study was conducted over two growing seasons, 2012 and 2013, which differed significantly in rainfall, rainfall distribution, and resulting NUE. Experiments were established at three sites for both crops in both years, on sites/soils selected for differing potentials for N loss, and mechanisms of N loss. One site was established at the Kansas State University Agronomy North Farm (N Farm), where yield potential was high, and N loss potential was low. A second site was established under irrigation at the Kansas River Valley Experiment Field near Topeka, KS (KRV), on a coarse silt loam soil with high potential for N loss through leaching. The third site was established at the East Central Kansas Experiment Field near Ottawa KS (ECK), on a clay pan soil with a high potential for denitrification loss. Weather conditions together with soil characteristics played a major role in the performance of N timing applications and impacted the response to the use of the inhibitors. In low N loss environments such as the N Farm, fall applications of AA to increase spring time-availability for producers showed minimal negative effects on yield or NUE. When combined with a nitrification inhibitor in the fall, performance was similar to spring application for both corn and wheat. At the KRV site leaching loss or potential loss from fall application was high for corn and wheat in both years, however little impact on NUE with NI use was observed. At the high ECK denitrification site, there was only one N loss potential event leading to inhibitor performance at Ottawa in corn in 2013.

The arid conditions found in the west allow for the production of high quality hay for export. However, hay production in this region is highly dependent upon irrigation. There is significant interest in developing a hay export market in the eastern U.S. Therefore, a greater understanding of the challenges and opportunities with containerizing hay in high humidity environments is needed. The objective of this study was to evaluate the impact of hay preservatives on the stability of containerized hay. Treatments included 1) propionic acid at baling, 2) propiopnic acid at baling + surface applied propionic acid at container loading, 3) propionic acid at baling + ammonization of the container after loading, and 4) no preservatives. Propionic acid was applied at a rate of 2.5 kg Mg-1 of hay at baling to all treatments except the control. Hay was then stored for 5 weeks before compressing to a density of 320.0 kg m-3. Immediately before containerizing hay, treatment 2 received a surface application of propionic acid at a rate of 3.4 g bale-1. After loading hay into containers, treatment 3 was ammoniated at a rate of 1.5 kg NH3 Mg-1 DM. Temperature and relative humidity in the containers were monitored for the 45-day storage period. Hay was sampled at compression and immediately after opening the containers. There were no treatment effects on nutritive value parameters after containerization (P > 0.05). Neither propionic acid at harvest, nor treatments at containerization had an effect on mold development in this study (P > 0.05). / Master of Science

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