Proceedings
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| Filter results10 paper(s) found. |
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1. An Overview of the Thompson/Baker Farming Systems StudyThere is a general lack of quantitative information, collected from field-scale studies, that can be used to assess long-term effects of alternative farming systems. The objective of an on-going study in central Iowa is to quantitatively evaluate several chemical, physical, biological, and economic parameters on the Richard Thompson (alternative) and Eugene Baker (conventional) farms. This project was initiated in 1989 on adjacent 32-ha tracts of land, that have Clarion loam, Nicollet loam, Canisteo... |
2. Effect of Starter Fertilizer and Plant Date on Soybean Growth, Nodulation, and YieldEnvironmental conditions at the time of planting are a crucial determinant to soybean (Glycine max) yield potential. In recent years, it has become common in Ohio to begin planting earlier in the growing season, as soon as mid- or late-April in some cases. However, soil conditions are typically cooler and wetter at this time as opposed to later planting dates, and nutrient availability may be limited. When planting soybeans into cool and wet soil, the application of a starter fertilizer may be beneficial... |
3. Evaluating Relationships between Soil Respiration and Nitrogen Use Efficiency in CornAvailable nitrogen (N) often limits the agricultural production of corn (Zea mays) and the N fertilizer use efficiency is of primary concern for producers in Kansas and the Midwest. This study was carried out to understand the agronomic value of commercially available soil health tests (e.g. 24 hr CO2 burst) and their relationship to components of nitrogen use efficiency (NUE) in corn. Relationships between N response and soil CO2 evolution were investigated across multiple sites and management... D. Ruiz diaz, B. Rutter |
4. Nitrogen Timing and Sidedress Placement Strategies in MichiganNitrogen (N) timing and placement methods are key components to improve corn (Zea mays L.) N management. Studies were initiated in Richville and Lansing, MI in 2017 utilizing four N timing strategies including 100% N broadcast after planting (PRE); 50% N pre-plant incorporated with 50% N sidedressed (SD) at V6 (50/50); no pre-plant N with 100% N SD V6 (0/100); and 40 lbs N A-1 applied 2-in below and to the side of the seed (2x2) with remaining N SD V6. The PRE strategy was also applied... T. Purucker, K. Steinke |
5. Soybean Seeding Rate and Nutrient Interactions on Growth and Yield in MichiganSoybean (Glycine max L. Merr.) prices are forecast to remain stagnant placing greater emphasis on production costs for growers across Michigan. Seeding rates and fertility inputs are two factors producers can manage to influence economic return. Field research was conducted in Richville and Lansing, MI in 2017 to evaluate biomass production and yield in response to nutrient inputs and help determine economically optimal seeding rates. The study was designed... T. Purucker, K. Steinke |
6. Respiration as a Measure of Soil Health: Challenges and OpportunitiesIn recent years, respiration has become a commonly-used soil health metric. It has been used as a standalone predictor of soil N supplying capacity and in conjunction with other metrics to assess overall soil health. However, the sources of variation underlying respiration itself have not been thoroughly assessed. We show that across growing regions in California, respiration was unable to accurately predict soil N supply. The R2 values were much higher in fields that had received a recently-incorporated... J. Wade, S. Culman, T. Hurriso, W. Horwath, R. Miller |
7. Surface soil acidification and lime application in no-till systemsSurface soil acidification can develop after multiple years under no-tillage system, a primary effect of multiple years of broadcast fertilizer application and organic matter decomposition. The objective of this work was to evaluate the effects of surface lime application on crop yield response and changes in soil pH in the soil profile. Field experiments were established at two locations in Kansas and selected base on similarities in management history (approximately 30 years under no-till),... D. Ruiz diaz, B. Rutter |
8. Comparison of Mehlich-3 and Haney H3A-4 Soil Tests in Kansas SoilsRecommended application rates of soil fertility amendments are often based on a soil test in agricultural production systems. Interpretation of these soil tests requires correlation and calibration to crop yield response, nutrient uptake, or existing soil tests. The Mehlich-3 soil test procedure is currently used to evaluate the plant availability of phosphorus (P) and potassium (K) in Kansas soils. However, the Haney soil test has gained attention in recentyear and has been used to adjust soil... B. Rutter, D. Ruiz diaz |
9. Evaluation of Plant Tissue Analysis to Assess Phosphorus Nutritional Status in Corn and SoybeanPlant phosphorus (P) tissue analysis can be used to identify the nutritional status and potential response to P fertilization. This study aimed to determine critical P tissue concentration at different growing stages for corn and soybean. The experiment was conducted across multiple corn and soybean locations in Kansas. Tissue samples were collected as whole plant V6 stage and ear leaf R1 stage in corn, whole plant V4 stage, and trifoliate R3 for soybean. Plant tissue samples were dried, ground,... G. Roa, D. Ruiz diaz, B. Rutter |
10. A Novel Calcimeter for Soil Carbonate Assessment with Implications for Accurate Soil Test MethodsCalcium carbonate equivalent content is an important soil characteristic, with rammifications for decisions made in agricultural production and soil testing labs alike. However, soil carbonate measurements are rarely included with soil fertility analyses in Kansas due to their tedius nature and the cost of analysis. The objectives of this study were to develop a reliable calcimeter using open-source electronics and readily available labware, and to evaluate it’s performance against procedures... B. Rutter, D. Ruiz diaz |