Evaluation of Row Spacing Effects on Irrigated Corn Production In Mississippi.

With the dramatic shift in row crop acreage in Mississippi from cotton to corn and soybeans during the past several years, evaluating row spacing specific for corn production could potentially increase grain crop productivity and profitability. The first year of a 3-year study was conducted in 2010 to (1) determine whether corn grown in single 30-inch rows produces higher yields than corn grown in conventional wide rows (38 to 40 in.) or twin rows (8 to 10 in. apart on a single bed) for four contrasting hybrids, and (2) evaluate how all combinations of row spacing and hybrids influences photosynthetically active radiation (PAR), leaf area index (LAI), stalk diameter, grain test weight, and grain nutrient uptake. Research was conducted on 2 furrow irrigated cornfields, and measurements were collected at silking (R1 growth stage) and at physiological maturity. Results from this study will help evaluate row spacing effects on crop development and yield for corn production in Mississippi. Initial results will be presented at the ASA Southern Branch 2011 Annual Meeting.