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| Ewing, Patrick M; University of Minnesota, Department of Agronomy and Plant Genetics ; ewing069@umn.edu; Runck, Bryan C; University of Minnesota, Department of Geography, Environment and Society; runck014@umn.edu. |
| The importance of corn production to the midwestern United States cannot be overestimated. However, high production requires high nitrogen fertilization, which carries costs to environmental services such as water quality. Therefore, a trade-off exists between the production of corn yield and water quality. We used the Groundwater Vulnerability Assessment for Shallow depths and Crop Environment Resource Synthesis-Maize models to investigate the nature of this trade-off while testing the Simple Analytic Framework trade-offs featured in this Special Feature. First, we estimated the current levels of yield and water quality production in northeastern Iowa and southern Minnesota at the 1-square-kilometer, county, and regional scales. We then constructed an... |
| Tipo: Peer-Reviewed Reports |
Palavras-chave: Agriculture; Agroecology; Corn belt; DSSAT; Fertilization rate; Frontier analysis; Groundwater nitrate; GWAVA-S; Land use; Nitrogen; Rotation; Row crops; Simple Analytics Framework; Yield. |
| Ano: 2015 |
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| Atwell, Ryan C; Iowa State University; ryancardiffatwell@gmail.com; Schulte, Lisa A; Iowa State University; lschulte@iastate.edu; Westphal, Lynne M; U.S. Forest Service Northern Research Station; lwestphal@fs.fed.us. |
| In the last 200 yr, more than 80% of the land in the U.S. Corn Belt agro-ecosystem has been converted from natural perennial vegetation to intensive agricultural production of row crops. Despite research showing how re-integration of perennial vegetation, e.g., cover crops, pasture, riparian buffers, and restored wetlands, at strategic landscape positions can bolster declining regional ecosystem functions, the amount of land area devoted to row crop production in the Corn Belt continues to increase. As this region enters a time of fast-paced and uncertain reorganization driven by the emerging bioeconomy, changes in land use will continue to take place that will impact the resilience of the Corn Belt’s linked social and ecological systems for... |
| Tipo: Peer-Reviewed Reports |
Palavras-chave: Adaptive co-management; Agriculture; Iowa; Learning; Nonpoint source pollution; Restoration; Scale; Social-ecological systems; Row crops; Corn Belt. |
| Ano: 2009 |
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| Otanásio,Pollyanna Nunes de; Vieira,Ludgero Cardoso Galli; Roque-Specht,Vânia Ferreira; Paula-Moraes,Silvana Vieira de; Luz,Priscila Maria Colombo da; Specht,Alexandre. |
| ABSTRACT: Given the increasing importance of Elaphria agrotina (Guenée) (Lepidoptera: Noctuidae) in corn crops, especially in the Brazilian Savannah biome, the present research aimed to study its development and survival on Greene’s and Poitout & Bues’s artificial diets (25±1°C, 70±10% relative humidity [RH] and 12h photophase). Poitout & Bues’s diet was more suitable than Greene’s diet, providing higher survival percent (77.51% vs. 5.57%), lower development time (49.81 days vs. 55.24 days) and higher fecundity (167.65 vs. 84.9 eggs), respectively. All the caterpillars reared on Poitout & Bues’s diet passed through six instars, while almost half of the larvae reared on Greene’s diet went through one less instar stage. Regarding the main... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Row crops; Adequacy; Biology; Lepidopteran-pests; Maintenance of colonies. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782018000500401 |
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