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240 results on '"Roberts, Roland K."'

1. Changes in the Use of Precision Farming Information Sources among Cotton Farmers and Implications for Extension

Author

Edge, Brittani, Velandia, Margarita, Lambert, Dayton M., Roberts, Roland K., Larson, James A., English, Burton C., Boyer, Christopher, Rejesus, Roderick, and Mishra, Ashok

Abstract

Using information from precision farmer surveys conducted in the southern United States in 2005 and 2013, we evaluated changes in the use of precision farming information sources among cotton producers. Although Extension remains an important source for producers interested in precision farming information, the percentage of cotton producers using Extension to obtain precision farming information has decreased over time. Results from our study should motivate Extension professionals to re-evaluate the precision farming information they provide to producers and the practices they use to provide such information in efforts to maintain Extension's importance as an information source.

Published
2017

47. Stochastic dominance analysis of winter cover crop and nitrogen fertilizer systems for no-tillage corn

Author

Larson, James A., Roberts, Roland K., Tyler, Donald D., Duck, Bob N., and Slinsky, Stephen P.

Subjects
Cover crops -- Research, No-tillage -- Research, Crops and nitrogen -- Research, Nitrogen in agriculture -- Research, Nitrogen fertilizers -- Research, Environmental issues, Research
Abstract

Corn is an important production alternative for farmers in west Tennessee (Tennessee Department of Agriculture 1997), but the soils on which it is grown are highly erodible (Bradley and Tyler [...]

Published
1998

48. Economic analysis of the effects of winter cover crops on no-tillage corn yield response to applied nitrogen

Author

Roberts, Roland K., Larson, James A., Tyler, Donald D., Duck, Bob N., and Dillivan, Kim D.

Subjects
Corn -- Economic aspects, Cover crops -- Economic aspects, No-tillage -- Economic aspects, Crops and nitrogen -- Economic aspects, Crop yields -- Economic aspects, Nitrogen in agriculture -- Economic aspects, Environmental issues, Economic aspects
Abstract

Corn production is an important source of income for farmers in west Tennessee (Tennessee Department of Agriculture 1997). The corn plant uses commercial nitrogen intensively with high application rates relative [...]

Published
1998

49. Conservation Agriculture and Maize Production Risk: The Case of Mozambique Smallholders.

Author

Kidane, Simon M., Lambert, Dayton M., Eash, Neal S., Roberts, Roland K., and Thierfelder, Christian

Abstract

Farming systems in southern Africa are characterized by substantial exposure to external risks to crop production. Compounding these external risks are the effects of climate change, soil degradation, and soil fertility decline that mandates developing sustainable intensification practices to address these issues. In 17 target communities of central Mozambique from 2008-2011, we evaluated the performance of conservation agriculture practices (CAPs) to assess the risk perceptions of smallholder farmers regarding these technologies. The study used the results from 638 farms representing three agro-ecological regions. Net returns were generated for each practice and compared using non-parametric procedures. Risk-preferred technologies were identified using mean-variance, stochastic dominance, and stochastic efficiency with respect to risk function criterion. The results suggest that maize yields were higher for the CAPs systems at low and high elevation sites as compared with conventional tillage practices. Yield variability was also lower in higher elevation areas. At higher elevations, direct seeding was risk-preferred, ranking higher by risk-averse farmers than conventional tillage practices. Risk preferences were ambiguous at lower elevations. However, defining producer utility with a power utility function allowed for comparisons of the technologies over a range of risk-aversion levels. At intermediate and higher altitudes, the direct seeding technology dominated the basin and conventional tillage practices. In low altitudes, and assuming producers were extremely risk-averse, the conventional practice might be preferred over CAP technologies. These findings have implications with respect to selecting areas where CAPs are known to out-perform conventional tillage systems before outscaling technology transfer programs to smallholders. [ABSTRACT FROM AUTHOR]

Published
2019
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