Conference Proceedings Available!
Proceedings
Authors
| Filter results25 paper(s) found. |
|---|
1. Effects of Residue Placement on Co2 Loss in an Irrigated, No-till Corn SystemIt is well known that residue management practices that leave crop residue on the surface, such as no-till agriculture, promote soil fertility. However, the effects of such practices on carbon sequestration can be highly variable. To better understand how residue management impacts the loss of carbon through mineralization, we investigated the effects of residue location and addition on CO2 produced from residue decomposition under no-till irrigated continuous corn in Northern Colorado. Over... H. Oleszak, F. Cotrufo, S. Leichty, C. Stewart |
2. Phosphorus Fertilizer Management and Cover Crop Effects on Phosphorus Loss from No-till Corn and Soybean.Loss of phosphorus from non-point source agricultural sources is a known contributor to the degradation and contamination of surface waters. Therefore, it is imperative to adapt agricultural best management practices which promote and preserve surface water quality. The goal of this study was to quantify the impacts of phosphorus fertilizer management practice (placement and timing) and winter cover crop on concentrations of total suspended solids, total phosphorus, and dissolved reactive phosphorus... E. Carver, N. Nelson, K. Roozeboom, G. Kluitenberg, P. Tomlinson, J. Williams |
3. Long-term Cover Crop Effects on Soil Organic Carbon, Nitrogen Stocks, and Water Stable Aggregates in the Semiarid Central Great PlainsGrowing cover crops (CC) in semiarid dryland cropping systems in the central Great Plains (CGP) may provide several benefits to soil health. This study examined long-term CC management effects on soil health in a no-till winter wheat (Triticum aestivum L.)–grain sorghum (Sorghum bicolor L.)–fallow (WSF) cropping system in southwestern Kansas. The experimental design was a split-split-plot randomized complete block with four replications. Main plots were... L. Simon, A. Obour, J. Holman, K. Roozeboom |
4. Nitrogen Availability Following Cover Crops in TX Cropping SystemsCover crops have been heavily promoted to improve soil health and function in US agricultural productions systems. Within semi-arid environments, interest in cover crops continues to grow although several concerns hinder adoption. As soil water use by cover crops is often a chief concern, nutrient availability to subsequent crops is also a concern. The objective of this study was to measure soil chemical and biological properties following various cover crops in a continuous cotton system under... P. Delaune, K. Lewis, P. Mubvumba |
5. Nutrient Partitioning Changes in the Past 30 Years of Cotton ProductionModern cotton (Gossypium hirsutum L.) cultivars are more compact and efficient due to optimization of genetics and changed management practices in the past 30 years. The most recent work evaluating nutrient uptake by cotton was done in early 1990s, hence a need to re-evaluate the nutrient accumulation and requirements in modern high productivity cultivars. The objective of this study was to compare the resource allocation of modern cotton cultivars (PM HS26, FM 958, and DP 1646)... I.B. Pabuayon, G. Ritchie, K. Lewis |
6. Optimizing Irrigation and Fertilizer Management in Cotton to Increase Nitrogen Use EfficiencyNitrogen (N) fertilizer is an important nutrient in cotton production, and if the optimal amount is not applied yield penalty may occur (Hutmacher et al. 2004). A more efficient application of N fertilizer based on plant N requirements, soil texture, and N availability can increase cotton yield and N-use efficiency (NUE). The main objective of this research was to determine the relationship between cotton lint yield and normalized difference vegetation index (NDVI) across multiple irrigation levels,... A. Bumguardner, T. Wheeler, K. Lewis |
7. Nitrogen Management in Conservation Systems to Increase Use Efficiency and Cotton ProductionConservation management practices like no-tillage and cover crops have the potential to reduce wind erosion and stimulate ecosystem service, but lingering doubts regarding nutrient immobilization and water usage may limit their adoption on the Texas High Plains. A study was initiated at the Agricultural Complex for Advanced Research and Extension Systems (AG-CARES) in Lamesa, TX to examine the impact of supplemental nitrogen (N) fertilization on cotton yields and nitrogen use efficiency (NUE)... J. Burke, D. Kelley, K. Lewis |
8. Conservation Management and Nitrogen Fertilization to Enhance Soil Chemical and Biological PropertiesCover crops and no-tillage are increasing in use across Texas. On the Southern High Plains (SHP) these practices are important mitigators of wind erosion and are suggested to increase soil health and other positive soil attributes. This study aimed to monitor and evaluate the soil chemical and biological changes that occur shortly after implementing conservation practices and nitrogen management strategies on the SHP. It was determined that in the short term some soil chemical and biological... M. Mcdonald, P. Delaune, T. Gentry, K. Lewis |
9. Impact of Post-feekes 6 Nitrogen Application in Winter Wheat Forage ProductionProducers have options when choosing how to utilize their wheat acreage in Oklahoma. These include, grain harvest only, dual-purpose grazing and grain, and graze-out where the wheat crop is used solely for grazing cattle. Many producers take advantage of graze out wheat as a forage for cattle during the winter season. With acreages of approximately 400,000 acres of winter wheat grown for graze out production in the state of Oklahoma in 2018, many questions regarding management of wheat for grazing... B. Finch, V. Reed, J. Rogers, J. bigatao souza, B. Arnall |
10. Relationship Between Plant Nitrogen and NDVI of Cotton on the Texas High PlainsNitrogen (N) is one of the most limiting factors in Texas High Plains cotton production (Bronson et al., 2001). Nitrogen build-up in cotton is near maximum for the season at first open boll, when leaf senescence begins (Li et al., 2001). Lint yield response to N is difficult to predict due to N response relying on water management and initial soil nitrate (NO3--N) (Morrow and Krieg, 1990). Normalized difference vegetative index (NDVI) is a tool that has been used to manage... A. Bumguardner, K. Lewis, G. Ritchie, K. Bronson, M. Maeda |
11. Legacy Impacts of Cattle Grazing on Soil N2O and CH4 Fluxes in Shortgrass SteppeGrazing cattle directly emit CH4 from enteric fermentation and contribute to soil N gas emissions related to nitrogen and organic matter additions from urine and manure deposits. Grazed soils can be sources or sinks of CH4, depending on moisture levels and localized manure patches. N2O emissions are related to availability of water as well as mineral N and labile C substrates in soil. Previously, we observed higher N2O and NH3 losses from fresh patches of urine and manure compared to... S. Del grosso, J. Derner, J. Delgado |
12. Soil Health Comparison in Organic and Conventional Cotton-Peanut Rotations in the Texas Plains RegionOrganic farming has been increasingly adopted in the Texas High Plains (THP), but restrictions on synthetic fertilizer use may be problematic if a system cannot mineralize sufficient nutrients from organic matter breakdown to meet crop needs. Cover crops are a tool utilized by both organic and conventional producers for nutrient management, weed control and soil conservation. A one-year study was conducted in organic peanuts in Lubbock and Vernon, TX, to assess the ability of cover crops... N. Boogades, K. Lewis, T. Gentry, P. Delaune, L.M. Ellman-stortz |
13. Soil Properties Affected by Grazing and Tillage of Annual ForagesNo-till (NT) management of annual crop production systems increases precipitation capture and storage. However, compaction with annual livestock grazing and the development of herbicide resistant weeds present challenges to long-term NT. An on-farm study was established in 2016 near Jetmore, KS to investigate the influence of annual tillage with a sweep plow compared to NT in a grazed continuous winter triticale production system. Forage productivity as well as weed density and soil properties... P. Mauler, J. Holman , A. Obour , L. Simon, K. Roozeboom |
14. Soil Physical Quality Effects of Novel Perennial Grain Cropping at Two Contrasting Sites in Alberta, CanadaNovel perennial grain crops have been proposed as a solution to several environmental issues facing modern agriculture, namely the loss of soil quality often associated with annual monocrops. Abundant literature has stressed the importance of good soil quality for maintaining and improving ecosystem services provided by agricultural systems including, but not limited to, soil carbon sequestration, disease suppression and water filtration. Conversion of annual croplands to perennial systems has... E. Daly, K. Kim , G. Hernandez-ramirez, K. Klimchuk |
15. Soil Health and Cotton Production in the Semi-arid Texas High PlainsSoil health has become a ubiquitous term in agriculture, but little is known about the impact of cropping system management on soil health metrics in semi-arid regions because of the majority of research has been conducted in humid or sub-humid regions of the United States. As a leading commodity of the semi-arid Southwest, cotton is an ideal candidate for soil health review. The purpose of this study was to assess a proposed set of soil health metrics in cotton production on the semi-arid Texas... J. Burke, K. Lewis, P. Delaune |
16. Subsurface Drip Fertigation Impacts on Nutrient Uptake and Partitioning in CottonSubsurface drip irrigation (SDI) is becoming a popular option for maximizing the water use efficiency of cotton (Gossypium hirsutum), especially in semi-arid environments of the Midsouth and Western United States. In the Texas High Plains where underground water resources from the Ogallala Aquifer are rapidly declining, there is increased adoption of water conservation technologies like center pivot and drip irrigation. In addition to increased water efficiency, drip irrigation allows... H.L. Valencia, J. Burke, T. Bennett, K. Lewis |
17. Nitrogen Management in Semi-arid Conservation Cotton Production SystemsThe Southern High Plains (SHP) region of Texas is one of the largest cotton-producing regions in the United States. Cotton production is hindered by climatic conditions and wind erosion, but attempts have been made to adopt conservation management practices like cover crops and crop rotations to limit these effects. Conservation management practices can reduce a soil’s susceptibility to wind erosion, but their adoption has been limited on the SHP due to producers’ concerns regarding... J. Burke, K. Lewis, W. Keeling, W. Keeling |
18. Developing Nitrogen and Phosphorus Fertigation Strategies in CottonSubsurface drip irrigation (SDI) is becoming a popular option for maximizing the water use efficiency of cotton (Gossypium hirsutum), especially in semi-arid environments of the Midsouth and Western United States. In the Texas High Plains where underground water resources from the Ogallala Aquifer are rapidly declining, there is increased adoption of water conservation technologies like center pivot and drip irrigation. In addition to increased water efficiency, drip irrigation allows... K. Lewis, H. Valencia, T. Roberts, J. Burke, G. Ritchie |
19. Relationship Between Soil Health and Nutrient Availability in Semi-arid Cotton ProductionThe use of conservation management practices, like cover crops and no-tillage, is common in semi-arid cropping systems to reduce wind erosion. However, the use of these practices can also reduce cotton lint yield. The purpose of this study was to determine the impact of nitrogen (N) management in conservation cropping systems to increase cotton lint yield. Two experiments were conducted at the Agricultural Complex for Advanced Research and Extension Systems in Lamesa, TX, USA. The first experiment... J. Burke, K. Lewis, J. Foster |
20. Carbon and Nutrient Dynamics in Regenerative Cotton Production Systems of the Texas Southern High PlainsCarbon (C) sequestration in soil provides environmental and agronomic benefits. However, building soil C in semi-arid cotton systems is difficult due to low rainfall, low biomass production and high temperatures. Regenerative systems, which utilize practices such as cover cropping and crop rotation, can increase the amount of C input in cotton (Gossypium hirsutum) production systems, but they may increase C losses via carbon dioxide (CO2) due to increased respiration from soil... N. Boogades, K. Lewis, C. Cobos, J. Burke, P. Delaune |
21. Cover Crop Termination Timing Effects on Soil and Cotton Nutrient AvailabilityCover crop termination timings can have large impacts on the amount of soil coverage, nutrient availability, and stored soil moisture in a system. Producers in semi-arid regions must gamble the possibility of increased soil infiltration and reduced soil water evaporation against the potential of decreased soil moisture; in the SHP, success is dependent on irrigation capacity and precipitation. Optimizing termination timings for semi-arid regions and in deficit-irrigation/dryland systems is critical... C. Cobos, G. Baath, J. Burke, S. Chatterjee, P. Delaune, K. Lewis |
22. Double Cropping Wheat System Effects on Soil Extracellular Enzyme Activity Related to Nitrogen and Phosphorous Cycling Across TexasConventional management of agricultural systems can threaten soil health by contributing to soil erosion, soil carbon loss, and inefficient water use in crop production. Cover crops and conservation tillage have been reported to improve soil health, but the additional planting and maintenance comes at an additional cost. Double-cropping systems have the potential to mitigate that cost by providing producers a secondary crop with an additional source of income while providing soil health benefits.... H. Valencia, K. Lewis, J. Foster |
23. Sustainable and Resilient Cropping Systems to Mitigate Wind Erosion for the Enhancement of Human HealthIn the Texas High Plains, regenerative cropping practices in a predominantly conventional farming area can be used to prevent further depletion of topsoil by wind erosion. This loss of topsoil can cause a decrease in agricultural productivity and form dust storms that can be detrimental to human health causing a rise in hospitalizations of chronic lung damage, cardiovascular disorders, and diseases contracted by inhalation. Using regenerative farming practices, both the number and size of dust... K. Lewis, R. Babcock, J. Burke, C. Cobos |
24. Advancing Precision Nitrogen Management in Agriculture: a Multifaceted ApproachAdvancing precision nitrogen management in agriculture involves achieving a balance between maximizing crop yield and minimizing environmental impact. Traditional nitrogen management approaches often lead to inefficiencies, contributing to environmental issues such as nitrous oxide emissions and nitrogen runoff. Significant challenges persist in quantifying factors influencing nitrogen dynamics in the soil-plant-atmosphere system, including landscape positions, soil properties, weather patterns,... W. Guo, R. Karn, K. Lewis |
25. Shining Light on Novel Pathways for Potassium Fixation in SoilCotton has a high demand for potassium, and potassium significantly affects both cotton yield and fiber quality. Thus, bioavailability of potassium from the soil is paramount. Bioavailability and leaching of potassium to crops and from soils has been studied since the 1940s. However, problems that confronted agronomists in the 1980s continue to impact growers and crop production, including unpredictable potassium bioavailability and inconsistent plant response to fertilizer application under a... M. Siebecker, K. Coyle, T. Pham, I. Saldana haworth, E. Schmidt, A. Sharma, K. Lewis |