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Corn Field Plot Technique

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Tests were planted at eight locations across the state. Two tests were located in the Tidewater in Washington and Beaufort County on organic soil (HM). In the Coastal Plain region, four tests were conducted in Columbus, Robeson, Lenoir, and Duplin counties. In the Piedmont, two tests were conducted in Rowan and Union county. Early, medium and full-season groups were included at all locations. Early-maturing hybrids are approximately 105 – 109 days to maturity, medium-maturing hybrids are approximately 110 – 115 days to maturity, and full-season hybrids are approximately >115 days to maturity. It is important to remember that these are loose groupings, i.e some hybrids may easily fit into either of two maturity groups. Seed companies listed the number of days to maturity for each hybrid. Table 2 lists the cultural practices used and Table 3 lists the soil tests results. Field trials were designed in a randomized complete block for each maturity group. Each plot consisted of two rows 22 feet long with a 30, 36, or 38″ row width, depending on location. The two rows were harvested for yield. Alley width was six feet.

In 2013, all hybrids were planted at the same population within maturity group. The early hybrids were 34,000 ppa while medium and late hybrids were 32,000 ppa. All hybrids were treated with Poncho (clothianidin) or Cruiser (thiamethoxam) or other systemic insecticides (Table 13).

Data

Data were collected on yield, moisture, lodging, ear height, and stand. All plot yields were adjusted to 15.5% moisture. Lodging percentage was determined by observing all plants broken below the ear or leaning more than 45 degrees. Ear height was determined by measuring the distance from the ground to the node where the ear attachs to the stalk.

Results

Page Last Updated: 9 years ago
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