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Timely Information > Posts > Interaction of Planting Date and Seeding Rate on Seedling Populations, TSW and White Mold Incidence, Leaf Spot Defoliation, and Yield of Three Peanut Cultivars in a Dryland Production System

​Seed account for up to 20% of the total variable production costs for peanut.  The impact of seeding rate of 3, 4, 6, and 8 seed per row foot as influenced by planting date on the incidence of TSW and white mold, leaf spot defoliation, and yield of commercial peanut varieties Georgia-06G, Georgia-09B, and Georgia-12Y in a dryland production system at the Wiregrass Research and Extension Center in 2014, 2015, and 2016.  Planting date but not seeding rate had the greatest impact on yield of peanut.  Yields were greater in two of three study years for the mid-April (1st Date of Planting [DOP]) than mid-May (2nd DOP)-planted peanuts, regardless of the variety.  Georgia-06G, Georgia-09B, and Georgia-12Y has similar yields except in 2016 for the latter variety when a sharp yield decline was noted at the 2nd DOP.  No yield gains were seen by increasing seeding rates.  The lack of a variety × seeding rate interaction showed that the absence of a seeding rate response was consistent across all varieties.  In a previous Alabama study, seeding rate had a limited impact on the yield of commercial peanut varieties in an irrigated production system.  Year (i.e. rainfall) had a sizable impact on yield.  With good rainfall through much of September, yields were averaged 5660 lb/A in 2016 as compared with drier late summer and early fall weather patterns in 2014 and 2015 when the mean yield was 2454 lb/A and 3217, respectively. 

Despite low TSW, leaf spot, and white mold pressure, planting date, variety, and seeding rate alone or in combination significantly impacted disease activity.  While TSW incidence was often similar across planting dates and varieties, greater disease was seen in the April than May planting of Georgia-09B in 2016.  Previously, incidence of this disease was also greater in April than May-planted peanuts.  Elevated TSW levels recorded at the lowest seeding rate is also consistent with the results of previous studies.  Leaf spot defoliation, which was greater in two of three years the May than April planted Georgia-06G, Georgia-09B and Georgia-12Y, also intensified slightly but significantly with increasing seeding rates in the May but not the April-planted peanuts.  When noticeable white mold development was seen in 2015, disease incidence was greater in April than May-planted Georgia-06G, Georgia-09B, and to a lesser extent Georgia-12Y varieties. Otherwise, white mold damage regardless of planting date was low in 2014 and 2016.  Overall, white mold incidence was lower in Georgia-12Y than the other two varieties.

Results of this and a previous Alabama study suggest that growers have some flexibility with seeding rates in dryland and irrigated production settings.  Even under drier conditions in 2014 and 2015, yield was similar across all seeding rates for all three peanut varieties.  None of the varieties screened showed a significant yield advantage, despite differences in disease damage. 

 

 The full report can be found in this file.Dryland Seeding Rate Summary Timely Information 2017.pdf


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