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Barley Response to Planting Rate in
Northeastern North Dakota
Summary
1. Planting rate effects on plant height, percent protein and days to head from planting were small in this study and should not affect cultural practices by the producer.
2. Lodging was significantly less at the 0.5 million seeds per acre planting rate compared to the 1.0, 1.5, and 2.0 millions seeds per acre planting rate. Although lodging was not correlated to yield loss in this study, producers need to be aware that other studies have shown that higher lodging scores can result in yield reductions.
3. Percent plump kernels and test weight response to planting rate varied by environment. Differences in kernel plumpness as a response to planting rates ranged from 1 to 22 percent between environments. The lowest planting rate generally had the highest percentage of plump kernels, although differences between planting rates were not always significant. Test weights generally were highest at the lowest planting rates.
4. Established plant populations of 31 plants per square foot produced optimum yields with no statistical differences in yield occurring between 17 and 39 plants per square foot. This is based on data from stands with very low weed competition.
5. Stand establishment is unpredictable due to environmental effects. Percent emergence can vary from field to field resulting in differences in plant population The goal of a producer is to establish a plant population of at least 17 plants per square foot. A seed lot with 95 percent germination and 12,000 seeds per pound would require a planting rate of 1.3, 1.4, 1.6, 1.8, and 2.2 bushels per acre at 100, 90, 80, 70, and 60 percent emergence, respectively, to obtain 17 plants per square foot. Seedbed conditions at planting, percent germination and seed size will dictate the planting rate that a producer chooses.
When stand establishment is below 17 plants per square foot careful consideration to yield loss, from delayed planting, in addition to seed, tillage and labor cost must be considered before a replanting decision is made.
Bryan K. Hanson
Associate Agronomist
Langdon Research Center
John R. Lukach
Superintendent
Langdon Research Center
Reference: ND Farm Research, Vol. 49 (5), Summer 1992
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