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1. Effect of NBPT-Amended Urea and UAN on No-till Corn in Northern IllinoisField evaluations of the urease inhibitor N-(n-butyl) thiophosphoric triamide (NBPT) have been extensively conducted across the USA with encouraging results. Most response data collected to date has been with corn. In this report results from 7 'years of experiments at two southern Illinois locations (Belleville and Carbondale) are presented. NBPT addition to broadcast-placed urea, when evaluated across N rates and locations, gave no- till corn yield increases averaging 8.4 bulac in 13 experiments.... |
2. Remote Sensing Techniques to Identify N Deficiency in CornNitrogen management remains a primary concern for corn production. Environmental consciousness has increased the need for diagnostic techniques to identify N deficiencies to guide corrective measures or to provide feedback on management practices. This study was designed to evaluate several techniques that measure reflectance from corn plants to detect N stress. The experiment was located in Central Nebraska and involved four hybrids and five N rates. Leaf reflectance, canopy reflectance, and aerial... |
3. Evaluation of Fertilizer Management in Strip-till and No-till Corn ProductionStrip-tillage for corn production may have advantages over no-till. particularly in areas with heavy soils andlor high rainfall during spring months. With these conditions in no-till systems. planting delays and/or slow, uneven emergence are common. Strip-tillage creates a narrow tilled area for the seedbed ivhile maintaining the intcr-row residue cover, allowing for the erosion protection associated with no-till, yet providing an area in the row where the soil will dry out and warm up earlier in... |
4. Networks of Precision Farming Trials to Evaluate and Improve Nitrogen Management for CornMost research to improve nitrogen (N) management has been conducted at relatively few locations on experimental farms. The advent of precision farming technologies offers the potential for producers to collect data on their farms. The objective of this paper is to describe how organized networks of producers using precision farming technologies can evaluate and improve N management practices. Pairs of N management practices were evaluated across many fms. Treatments were applied in alternating... B.W. Van de woestyne, A.M. Blackmer, T.M. Blackmer |
5. Quantifying Risk in Nitrogen Management through On-Farm EvaluationsThe process of nitrogen (N) management in corn (Zea mays L.) production is often reduced to finding ways to manage various risks. These risks include common difficulties of quantifying soil N availability, avoiding N fertilizer losses, and predicting the impact of weather before and after fertilizer applications. This poster provides a synopsis of several recent on-farm evaluation studies conducted across Iowa. These studies were designed and executed to identify management, soil, and weather factors... |
6. Fertilizer management and cover crop effects on phosphorus use efficiency, environmental efficiency and crop yieldPhosphorus loss from agricultural production is a significant contributor to the degradation and contamination of surface and ground waters. To help protect these waters, it is vital to maximize agronomic and environmental efficiency of phosphorus in the cropping system. The objective of this study was to quantify the effects of cover crops and different phosphorus fertilizer management practices on nutrient use efficiency, environmental efficiency and yield in a no-tillage corn-soybean rotation.... R. Carver, N. Nelson, G. Kluitenberg, K. Roozeboom, P. Tomlinson |
7. Water Use Efficiency and Soil Changes After Long-term Crop Rotation Under Limited IrrigationLong-term crop rotation intensity and diversity can affect key soil properties. In semi-arid regions, the combined factors of rotation and soil properties may also affect the overall water use efficiency from either limited irrigation or rainfall. The objective of this study was to evaluate changes in soil properties, and water use efficiency of corn grown under different rotation intensity and diversity and limited/supplemental irrigation. A field experiment was conducted over seven years in... P. Garcia, D. Ruiz diaz, B. Olson, A. Tonon rosa, K. Roozeboom |