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1. Influence of Phosphorus and Potassium Fertilization on Alfalfa Yields Under Intensive HarvestIn the northern part of the North Central (NC) states cutting management schedule and adequate fertilizer are important factors in maintaining alfalfa stands. Recent work in Minnesota by Sheaffer indicates that fall cutting poses some risks to lon-term stand persistance but should be considered as a management alternative to allow greater harvest flexibility. He further states that stand loss can be greatly reduced by high levels of fertilizer (particularly potassium). The study I am reporting on... |
2. No-till Corn Response to N Fertilizer Sources and Placement Methods- A Summary of Southern Illinois ResultsExperiments were conducted in southern Illinois from 1984-1986 to evaluate the placement efficiency of several N fertilizers used in no-till corn production. Such information has become of meaningful importance as producers strive to obtain the greatest possible returns from their N fertilizer investment and to obtain yields and a level of profitability equal to that of more conventionally produced corn. Also, in the near future, no-tillage will become an important tool for many farmers in southern... |
3. Environmental Sulfur Sources as Inputs for Predicting Sulfur NeedsCrop responses to sulfur fertilization have been damstrated in mt states in the midwest, but the frequency of these responses is relatively lm. Sulfur deficiencies are usually confined to areas where one or mre of the follcrwing conditions exist: (1) Sandy or shallow soils; (2) Low soil organic matter content; (3) No recent manure applications; (4) Low atmospheric sulfur deposition; (5) High crop sulfur requirement. Although diagnostic tests to predict crop response to applied sulfur are an cbvious... |
4. Predicting Relative Yield of Corn in Indiana Using an Active SensorFine-tuning N fertilization is important for impr oving the economic and environmental impact of corn production. This importance is highlighted by ever rising fertilizer prices and increased public scrutiny. Reflectance measurements usi ng an active sensor during the growing season may be useful for determining the need for additio nal N. This is the second year of a multi-year study to evaluate canopy reflectanc e as an N management tool across a variety of Indiana soil types. The objectives of... |
5. Effect of Late-Applied N on Corn Dry Matter, N Content, and YieldNitrogen management of corn (Zea mays L.) may be improved by delaying N application until just prior to the rapid growth phase (approximately V6-V8). This timing is commonly referred to as 'sidedress'.� Some farmers do not sidedress because they are concerned inclement weather may delay N application beyond V8, requiring high clearance equipment to apply N and possibly reducing grain yield. However, few studies have investigated the effects of late-applied N in rain-fed production environments... |
6. Validating Potassium Fertilizer Guidelines in Alfalfa-corn RotationsIn 2008 to 2010, on-farm research was conducted on 10 fields with medium soil test K (STK) to validate Minnesota K fertilizer guidelines by determining the effect of K fertilizer applications on alfalfa yield and quality in its last production year, and estimating the carryover of excess fertilizer K to first-year corn. We were surprised to find that no K fertilizer was needed to maximize alfalfa yield or overall forage feed value and quality. Luxury consumption of K occurred because as K application... |
7. Corn Responses to Sulfur Fertilizer in IndianaCorn yield increases in response to sulfur (S) applied as ammonium thiosulfate in liquid N (in sidedress and/or starter fertilizer applications) occurred in ~40% of 40 trials conducted between 2017 and 2021 and ranged from 4 to 24 bushels per acre on responsive sites. Increased grain yield with S fertilization occurred on soils ranging in texture from sandy loam to silty clay loam and soil organic matter concentrations from ~1 to 3%. Yield increases with S fertilization were not predicted by Mehlich‑3... J. Camberato, D. Salguero, R. Nielsen |
8. Integration of Satellite and UAV Imagery for Assessing Corn Nitrogen Uptake at Early Vegetative Growth StagesNitrogen (N) fertilizer accounts for 20-25% of the variable cost of production for rotation maize in Indiana. Spatial variability within fields and variable, unpredictable rainfall patterns make N a challenging nutrient to manage, withup to 65% of the nitrogen applied being lost as nitrate. Post-emergence sidedress applications of N fertilizer can reduce N loss and improve plant uptake, so efficient and practical ways to identify maize N status at early maize growth stages is key to assessing... A. Morales ona, R. Nielsen , J. Camberato, D. Quinn |
9. Exploring the Impact of Temporal Variability in Emergence on Corn Grain Yield and Development PatternsConcerns have raised among farmers in the Midwest regarding the impacts of uneven emergence of corn (Zea mays L.) seedlings. Research has showed that even a minor delay in emergence of a few hours could have a substantial influence on plant performance and ear weight; and one of the contributing factors to uneven seedling emergence in corn is the application of starter fertilizer. Placing fertilizers in the seed furrow increases the salt concentration surrounding the seed and as a result, delays... L. Dorissant, P. Kovács, J. Clark |
10. Carryover Effects of Sulfur Fertilization from One Cropping Season to the NextCorn and soybean grain yield increases with S fertilization are not uncommon in Indiana. Low rates of S fertilizer (<15-20 lb S/acre) are needed to maximize grain yield response. We found that sulfate-S fertilizer applied to silt loam or heavier textured soils in one cropping season provided S to the crop grown the next season more often than not. At some S responsive locations, S applied the prior season at 15 to 20 lb S/acre produced yields of the second crop equivalent to crop yields with... J. Camberato, R. Nielsen |