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- W2182018106 abstract "eeting the future global demand for corn (maize) and soybean, including the rapidly rising feedstock demand for biofuel production, will largely have to be achieved through yield increases (Cassman et al., 2003). Average crop yields may have to approach 80% of the yield potential or more, particularly in areas with favorable rainfall or irrigation. At issue is whether such high crop yields can be achieved without increasing GHG emissions from agricultural land. A central hypothesis for such an ecological intensifi ca- tion of agriculture is that an optimal balance of high produc- tivity, sustainability, and minimal environmental impact can be achieved by fi ne-tuning of management towards better exploitation of crop yield potential. To assess such options requires full accounting of the GWP of agricultural systems, including net changes in SOC, intrinsic C costs associated with crop production, and net emissions of GHG such as N 2 O and CH 4 . Such information is scarce for cropping systems that are designed to explore the upper limits of agriculture. The Ecological Intensifi cation Experiment A long-term experiment on Ecological Intensifi cation of Irrigated Maize-Based Cropping Systems was established in 1999 in Lincoln, Nebraska, USA. The primary objective of this study is to evaluate resource-effi cient management concepts for achieving crop yields that approach the climatic yield potential. In this article, we summarize the net GWP of four high-yielding cropping systems. The soil at the study site is a deep Kennebec silty clay loam with relatively high soil fertility status (pH 6 to 6.5, 2.5 to 3% organic matter, 300 to 400 ppm K, and 60 to 80 ppm Bray-1 P). The fi eld experi- ment was conducted with three crop rotations as main plots (CC - continuous corn, CS - corn-soybean with corn in even years, SC - corn-soybean with corn in odd years), three plant population densities as sub-plots and two levels of nutrient management as sub-subplots. Four management systems were selected for this analysis: 1) CC-rec: continuous corn with recommended management, 2) CC-int: continuous corn" @default.
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- W2182018106 date "2007-01-01" @default.
- W2182018106 modified "2023-09-24" @default.
- W2182018106 title "Global Warming Potential of High-Yielding Continuous Corn and Corn-Soybean Systems" @default.
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