Proceedings
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| Filter results11 paper(s) found. |
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1. Comparative N and Dry Matter Dynamics in Corn Ears, Stems, and Leaves During the Critical Period After Early and Late-split Sidedress NThere is currently great interest in the possible agronomic and environmental benefits of split N applications that include a late vegetative sidedress timing. The objective of this study was to determine the impact of N rate and timing of N application on the accumulation of N and dry matter in the ears, stems, and leaves of corn during the critical period (encompassing the period two weeks before to two weeks after silking) in order to understand the differing sensitivity to N stress in these... S. Mueller, T. Vyn |
2. The Total Maximum Daily Loads Process in KansasThe Clean Water Act of 1972 required states to establish Total Maximum Daily Loads (TMDLs) for surface water bodies that contain one or more pollutants that exceed water quality standards. A TMDL is a written, measurable assessment of a specific stream segment and its water quality problems and contributing pollutants. This assessment outlines the amount of a pollutant that needs to be reduced to meet water quality standards. allocates control responsibilities among pollution sources in a watershed.... |
3. Field Estimate of Dairy Manure Nitrogen Availability to PotatoesWithin Wisconsin, there is a distinct movement toward dairy herd expansion and consolidation of small farms. With the increase in manure production, these large dairies are considering various land and manure management arrangements with non-livestock farmers, such as potato producers. The purpose of this study is to evaluate several potato production issues resulting from such partnerships including the availability of dairy manure nutrients to potatoes. Nitrogen and phosphorus availability were... |
4. Phosphorus Runoff From Incorporated and Surface-Applied Fertilizer and ManureContinued inputs of fertiher and manure in excess of crop requirements have led to a build-up of soil phosphorus (I?) levels, creating an environmental rather than agronomic concern (Sharpley et al., 1994). The objective of this study was to evaluate the effects of soil test P level, source of P amendments, tillage, and manure application method on P runoff from agricultural soils. The treatments consisted of swine manure surface applied and injected at rates of 29 and 59 Ib acre-' of P, and triple... |
5. Iowa Soybean Nitrogen Fixation Consider in Nitrogen BudgetsSoybean (Glycine max) is one of the most important agricultural commodities grown in Midwestern states of the US and some other parts of the world. Like many other legumes, soybean can associate symbiotically with nitrogen (N) fixing bacteria, which can transform the N2 from the atmosphere into NH3 a more available N form, through a process known as biological N fixation (BNF). However, BNF is an energy expensive process for soybean that requires carbohydrates from... S. Cordova, R. Dietzel, M. Licht, S. Archontoulis, M. Castellano |
6. Reevaluating Potassium Recommendations for Soybean Production in KentuckyFertility recommendations from land grant universities are typically lower than private soil test laboratories and lead producers to question the adequacy of current recommendations. Further, soil samples analyzed at UK Regulatory Services Soil Testing Laboratory indicate that average state-wide soil test potassium (K) levels are declining approximately 1 lb K/A/year. The reason for this decline is not known, but some suspect it might be due to increased crop yields while maintaining historical... E. Ritchey, J.H. Grove, J.M. Mcgrath |
7. Updating Phosphorus Recommendations for IllinoisIllinois soil phosphorus (P) recommendations are outdated and make use of concepts such as soil P supply power are outdated. This 2022 Illinois State Report provides a summary and outlook on key considerations for P recommendations that may be instructive to other North Central states. ... A. Margenot |
8. Effects of Cover Crops on Surface Runoff Under Increasing Precipitation IntensitiesWith climate change increasing the frequency of extreme precipitation events, the risks of erosion, nutrient transport and flooding increase as well. Cover crops (CC) are a best management practice for cropping systems that are vulnerable to soil erosion. The objective was to analyze the effects of CC and precipitation intensity on surface runoff and water quality under natural precipitation events. Runoff and water quality data were collected from 2015-2022 from a corn-soybean cropping... S. Moylan, N.O. Nelson, G. Kluitenberg, A. Sheshukov |
9. County-Level Phosphorus Balances for 2017 in IllinoisCropland phosphorus (P) balances (manure and fertilizer P minus crop P removal) are great sustainability tools to assess long-term managements at farm, county, and state levels. Our objectives were to estimate county, regional, and state-level cropland P balances for Illinois in 2017. Based on the census data in 2017, Illinois county P balance ranged from -14.38 to 36 lb/acre/yr. Overall, Illinois had a negative P balance at about -3 lb/acre/yr. About 71% of counties, had a negative P balance,... X. Liu, S. Xu, A. Margenot, A. Sadeghpour, O. Zandvakili, M. Guzel |
10. Phosphorus Management in the North Central Region: A Brief History, Current Unknowns and Next StepsThe history of phosphorus (P) reflects the history of agriculture in the North Central region. The yield-limiting importance of P, secondary to nitrogen, was recognized as at the turn of the 19th century. An overview of key developments and unfinished business following the picking of these low hanging fruit in the 20th century that face researchers, agronomists, and producers will be discussed. These include assessing P mobility, P sources from fertilizer versus soil, the concept of... A. Margenot |
11. Evaluating Soil Health Indicators in Response to Tillage, Crop Rotation, and Cover CroppingSoil health is shaped by management practices that influence soil physical, chemical, and biological properties. Conservation practices such as reduced-disturbance tillage, cover cropping, and diverse crop rotations are increasingly promoted for improving soil structure, nutrient cycling, and microbial activity. However, the extent to which these practices interact and whether newly adopted no-till systems show similar benefits to long-term reduced tillage remains unclear. This study evaluates... S. Mesman, J. Clark, V. Nunes, P. Sexton |