Illinois study shows yield advantage with strip-till
Stover accumulation has been shown to reduce corn grain yields in continuous corn production systems leading to suggestions that high corn prices, which result in more continuous corn production, will also could result in widespread implementation of stover removal practices.
However, effects of stover removal on soil fertility requirements and soil organic matter levels is an on-going concern and must be considered when growers decide to remove stover from continuous corn fields. In this project, Fred Below, Laura Gentry and associates assessed the effectiveness of stover removal for increasing corn yields in high-yielding and conventional environments as well as nutrient management consequences of stover removal.
High yielding environments consisted of higher plant populations, increased nutrient fertilizer application, insect protection traits, and application of fungicides.
Conventional environments consisted of more common planting populations, less intense fertilizer applications, no insect protection traits (a granular soil insecticide was applied at planting in both environments), and no fungicide application.
Additionally, three residue management treatments (crop rotation, partial stover removal, and tillage) were applied at two levels (9th-year continuous corn vs. long-term corn-soybean rotation, stover retained vs. 50% stover removed, and conventional-tillage vs. strip-tillage) to assess their individual and combined effects on the input treatments (plant population, nutrients, traits, and fungicide) and corn yields. In this summary we are reporting the results from 2013.
click image to zoomYellow: Corn/Soybean rotation with all practices employed Orange: Same, without P-K-S fertility added Blue: Better hybrid taken out, standard hybrid selected. Strip-tillage is a relatively new reduced tillage system in the Central Corn Belt that protects soil from erosion, retains plant-available water, maintains soil structure and retains soil organic matter, and allows banding of fertilizers for more efficient plant uptake. Strip-tillage can substantially reduce soil compaction associated with multiple seedbed field operations; this also represents cost savings as a result of eliminating fuel use, labor, and equipment wear. These three agricultural management practices – crop rotation, residue management, and reduced tillage – were tested for their individual and cumulative effects on agricultural sustainability parameters and corn yields in combination with the omission treatment design previously employed to investigate high yield management factors for corn production.
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