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- W2892166217 abstract "Core Ideas Conservation agriculture practices benefit potentially mineralizable nitrogen Optimum N fertilizer inputs benefit potentially mineralizable nitrogen, but low and excessive N fertilizer does not Legume cover crops benefit potentially mineralizable nitrogen, but non‐legume cover crops do not Crop rotations with ≥3 crops benefit potentially mineralizable nitrogen, but simpler rotations do not No‐till has greater PMN than chisel and moldboard plow Conservation practices consistently increased both PMN and yield; however, the increase in PMN and yield were not correlated Potentially mineralizable nitrogen (PMN) is considered an important indicator of soil health. Cropping systems management can affect PMN. However, the effect size and relationship with crop yield across specific management practices remain uncertain. We conducted a quantitative review to understand how conservation agriculture management practices affect PMN including N fertilizer application, cropping system diversity, and tillage system as well as the relationship of crop yield with PMN. Data were extracted from 43 studies published in peer‐reviewed journals, providing 494 paired comparisons of PMN and 26 paired comparisons of PMN and yield across selected crop management practices. In our meta‐analysis, the effect size for each management practice was expressed as a response ratio, calculated as PMN or yield for the fertilizer application, high crop diversity, and no‐till system to the no‐fertilizer, less diverse crop system, and tillage system. On average, N‐fertilized cropping systems had greater PMN; compared with no N fertilizer, inorganic N fertilizer had 22%, and manure had 34% higher PMN. Diverse cropping systems also had greater PMN; three or more different crops in rotation had 44% greater PMN than continuous cropping systems; cropping systems with a leguminous cover crop had 211% greater PMN than systems without cover crops. Compared with till systems, no‐till systems had 13% higher PMN. Overall, conservation practices consistently increased both PMN and yield; however, the increase in PMN and yield were not correlated. Consistent with the use of PMN as a soil health indicator, this synthesis demonstrates that practices benefiting PMN also benefit yield." @default.
- W2892166217 created "2018-09-27" @default.
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- W2892166217 date "2018-09-01" @default.
- W2892166217 modified "2023-10-17" @default.
- W2892166217 title "Conservation Agriculture Practices Increase Potentially Mineralizable Nitrogen: A Meta‐Analysis" @default.
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- W2892166217 doi "https://doi.org/10.2136/sssaj2017.07.0245" @default.
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