Skip-row corn reduces risk for western Nebraska
Nebraska Panhandle farmers have been growing more dryland corn in recent years, encouraged by good crop prices and timely rains. However, without rain, corn production in the Panhandle is a risky business. One way to help manage the risk is to use skip-row planting patterns.
As a result of research conducted by the University of Nebraska-Lincoln from 2004 to 2006, we can make some recommendations about skip-row planting patterns for dryland corn. The recommendations vary with the expected yield (see below).
Panhandle dryland corn acreage has varied from a low of about 10,000 acres in 1995 (prior to the 1996 farm bill), to a high of about 96,000 acres in 2000, the beginning of the eight-year drought. By 2005, dryland corn acreage had fallen to just 22,000 acres. Acres rose to 93,000 in 2011. Continued strong corn prices could see dryland corn acres in the Panhandle exceed 100,000 for the first time.
Skip-Row Trials Conducted in Three States
Twenty-three field trials were conducted to compare skip-row planting to conventional corn planting from 2004 through 2006 across Nebraska, western Kansas and northeast Colorado. In Nebraska, trials were located from Mead in the east to Scottsbluff in the west. Soils ranged from silty clay loams to very fine sandy loams.
Roundup Ready corn hybrids adapted to the location were no-till planted into the preceding crop residues. Nitrogen fertilizer was applied in all studies based upon soil nitrate tests and expected yields.
All trials were conducted without irrigation (dryland) and consisted of four planting patterns and three plant populations. Planting patterns were:
- the standard planting pattern, consisting of planting every row using a 30-inch row spacing,
- plant two rows and skip one row,
- plant one row and skip one row (single skip-row)
- plant two rows and skip two rows (double skip-row).
Plant populations were selected to represent a broad range of recommended populations for an area. In western Nebraska and Kansas, plant populations were 10,000, 15,000, and 20,000 plants per acre; in eastern Nebraska, 15,000, 22,500, and 30,000; and at Akron, Colo., 8,000, 12,000, and 16,000.
The purpose of including various plant population treatments was to understand how plant population interacted with planting pattern. Study results did not show a strong link between these factors.
click image to zoomFigure 2. Yield differences of skip-row planting patterns relative to the standard planting pattern in a 30-inch row spacing. Markers above the 0 horizontal line indicate that skip-row performed better than traditional planting, while those below the line indicate skip-row did not yield as well as traditional planting . P2S2 = plant two rows, skip two rows; P1S1 = plant one row, skip one row; and P2S1 = plant two rows, skip one row A Regional Recommendation