Groundwater and agriculture: Insights from farmers in central Minnesota on how to protect both

Bohman, Brian J.; Kader, Jen; Newville, Darren; Johnson, Brittney; Yetka, Leslie; Jennings, Carrie E.

doi:10.2489/jswc.73.5.122a

Cited by 2 publications

(3 citation statements)

References 2 publications

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“…A mixed linear model was used to test fixed effects of tillage system, site, and their interactions for each year individually. real and perceived concerns (Bohman et al, 2018). However, our study provides production-scale empirical data that suggest these concerns do not necessarily translate into yield losses when compared to the standard CP system.…”

Section: Discussionmentioning

confidence: 81%

“…This study compared on‐farm conservation tillage systems during the initial 4 yr after implementation. Farmers often find these initial years the most challenging due to numerous real and perceived concerns (Bohman et al, 2018). However, our study provides production‐scale empirical data that suggest these concerns do not necessarily translate into yield losses when compared to the standard CP system.…”

Section: Discussionmentioning

confidence: 99%

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Crop and Soil Responses to On‐Farm Conservation Tillage Practices in the Upper Midwest

Daigh

DeJong-Hughes

Gatchell³

et al. 2019

Agricultural & Env Letters

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In the US upper Midwest, the narrow growing season causes many farmers to presume yield losses when reducing tillage. The purpose of this study was to determine how four production-scale tillage systems affected residue cover, stand populations, crop yields, and soil chemical, biological, and physical properties. Tillage systems (chisel plow, fall strip-till with shanks, spring strip-till with coulters, and shallow vertical till) were continued for 4 yr. Tillage effects within a site were few and mixed (0.17-0.36 Mg ha-1 difference), whereas site effects were common (0.50-3.00 Mg ha-1 difference). Among 19 soil properties, only fungal/bacteria ratios differed among strip-till with shanks (0.078) and strip-till with coulters (0.066) at one site. Our results suggest that many farmers' concerns about using conservation tillage practices do not necessarily translate into yield losses when compared to standard chisel plow practices. Economics and the level of erosion control among the tillage practices compared here, rather than yield alone, should guide farmer preferences.

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Section: Discussionmentioning

confidence: 81%

Section: Discussionmentioning

confidence: 99%

Crop and Soil Responses to On‐Farm Conservation Tillage Practices in the Upper Midwest

Daigh

DeJong-Hughes

Gatchell³

et al. 2019

Agricultural & Env Letters

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“…Notably, we found that conservation tillage had a largely positive effect on maize yields in the northern Corn Belt, where it has historically been more limited in practice ( figure 1(a)). While it is possible this effect is driven by early adopters inordinately adept at managing their fields, recent studies in Minnesota [29,76], New York [12], and Canada [32] provide increasing evidence for conservation tillage interest and feasibility in these more northerly latitudes.…”

Section: Yield Effects Of Long-term Conservation Tillagementioning

confidence: 99%

Satellites reveal a small positive yield effect from conservation tillage across the US Corn Belt

Deines

Wang

Lobell

2019

Environ. Res. Lett.

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Conservation tillage is a primary tenet of conservation agriculture aimed at restoring and maintaining soil health for long-term crop productivity. Because soil degradation typically operates on century timescales, farmer adoption is influenced by near-term yield impacts and profitability. Although numerous localized field trials have examined the yield impacts of conservation tillage, their results are mixed and often unrepresentative of real-world conditions. Here, we applied a machine-learning causal inference approach to satellite-derived datasets of tillage practices and crop yields spanning the US Corn Belt from 2005 to 2017 to assess on-the-ground yield impacts at field-level resolution across thousands of fields. We found an average 3.3% and 0.74% yield increase for maize and soybeans, respectively, for fields with long-term conservation tillage. This effect was diminished in fields that only recently converted to conservation tillage. We also found significant variability in these effects, and we identified soil and weather characteristics that mediate the direction and magnitude of yield responses. This work supports soil conservation practices by demonstrating they can be used with minimal and typically positive yield impacts.

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Groundwater and agriculture: Insights from farmers in central Minnesota on how to protect both

Cited by 2 publications

References 2 publications

Crop and Soil Responses to On‐Farm Conservation Tillage Practices in the Upper Midwest

Crop and Soil Responses to On‐Farm Conservation Tillage Practices in the Upper Midwest

Satellites reveal a small positive yield effect from conservation tillage across the US Corn Belt

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