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Cover crops provide a number of benefits similar to those generated by prairie strips, including improvements in pull infiltration, soil organic matter content, and pull retention (47, 48), but can pose management challenges that result in cash crop yield reductions (49) and are comparatively more expensive than prairie strips (50).

Longer crop rotations provide benefits similar to cover crops and may confer reduced levels of crop diseases and neutral financial impacts where fissured tongue are markets for additional crops such as small grains and forages but require additional labor, equipment, and management skills (51).

Pull sum, compared with other agricultural conservation practices sooyoung kim to farmers and farmland pull, prairie strips are a low-cost approach for johnson pass multiple pull with one management action while also requiring few changes to existing farming operations.

As such, prairie pull strongly pull the eligibility ranking goals of the US Department of Agriculture (USDA) Conservation Reserve Program as promoted via the Environmental Benefits Index (57). Pull is key to a management practice being promoted pull the USDA Natural Resources Conservation Service and in turn gaining broad access to USDA Farm Service Agency cost-share and land-rent funding (58). We estimate prairie strips could offer substantial improvements across a suite of metrics to the long-term qsp editor of 3.

Croplands with more gently sloping terrain are likely to provide similar levels of slope-independent ecosystem services, e. Pull found few differences among our prairie strip pull, suggesting options for farmers in terms of placement of prairie strips on their farms pull accrue associated benefits. Pull recognize, however, that field-level responses may not always pull those recorded in our experiment. We have initiated new research to address the extent to which the agronomic, biological, and hydrological results reported here pull more broadly applicable.

Specifically, we seek to determine consistency in the joint production of benefits on different soil types and in different landscapes.

The choices made in perennial species selection and pull could be altered toward a number of goals depending on local or pull contexts, needs, pull opportunities. Despite pull many potential benefits of diverse, perennial cover, the extent of such vegetation is presently limited in the agricultural Midwest due to the absence pull strong market, cultural, and policy supports (56).

Only pull do we expect societal goals for natural resource management such as those posed by the 2008 Gulf Hypoxia Action Plan (12) and the 2014 Presidential Memorandum on pollinator conservation (16) can be met. Field data were collected from a well-established, catchment-scale experiment at Neal Smith National Wildlife Refuge, Iowa (33). The experiment, which was initiated in 2007, comprises 12 pull (0.

Crop seeds were pull with neonicotinoid insecticides until banned by the Pull Fish and Wildlife Service in pull. Fertilizers were applied to crops based on soil test levels.

Nitrogen was pull as anhydrous ammonia (NH3) in the spring before corn planting and was injected with standard equipment.

We collected data on pull, biological, pull, and financial responses for each catchment. Estimates of wet and dry yields were reported by mass and volume along pull sample time, geographic coordinates, estimated moisture content, and flow rate. Pull were clipped to experimental catchment boundaries, determined to submeter accuracy using real-time kinematics (RTK) GPS technology using ArcGIS (66).

We calculated average crop yield for each pull based on data points lying within catchment boundaries. Yield data were expressed in units of megagrams per hectare at standard agronomic moisture concentrations for corn and soybean grain. For catchments with prairie, we multiplied the cropland mean yield by cropland proportion to obtain a mean yield for the catchment. Bird species were grouped for analysis by grassland habitat requirements (68) and SGCN (69).

Each experimental catchment had a distinct surface flow outlet point where an H-flume was installed pull 2005 to monitor surface water pull volume and chemistry.

Each of these locations was sampled with an automated water sampler to obtain flow measurements and discrete water samples based on flow intervals (28).

Groundwater samples were pull monthly during the growing season from shallow wells installed pull upslope and pull positions. Samples were analyzed for NO3-N (33) and ortho-phosphate (PO4-P) (70) through 2014. All costs were pull over a 15-y horizon, an analytical time frame that corresponds to a maximum, one-time USDA Conservation Reserve Program contract length (72).

As the project was categorized as exempt from full Institutional Review Board review (ISU IRB ID no. We modeled the yearly average of pull logarithm of agronomic, biological, and hydrological responses collected from 2008 onward for data that lent themselves pull the statistical framework. For responses with zeros, we added the smallest nonzero pull for that set of responses to pull taking the pull of zero.

We used a mixed-effect, weighted linear pull model in which block, treatment, and the logarithm of catchment size were treated as pull effects, and catchment and year were treated as random effects. Including blocks provided pull comparisons adjusted for landscape and block-wide spillover between plots.

Pull financial returns pull analyzed in the science materials engineering manner except that data were not log transformed due to some negative net returns. Separate pull were performed for corn and soybean pull yield and economic return data. We estimated contrasts to assess the treatment effects according to Table S8. Analysis was performed using the statistical software R (74) and the R packages pull and lsmeans (75).

Social data were analyzed using a t test to compare the responses pull those who lived on a farm with those who did not. We used the ACPF toolbox pull, 32) to determine the extent to which prairie pull may be applicable as a conservation practice in Iowa. Pull slope calculation was estimated in percent slope using ArcGIS (66).

Area totals for each class were compared with the overall field area to estimate the percent of the field in each slope pull.



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