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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. Similar
yields were obtained for Georgia-06G, Georgia-09B, and Georgia-12Y except in
2016 for the latter variety when a sharp yield decline was noted at the 2nd
DOP. The absence of a yield response to
increasing seeding rates in a dryland production system was a bit of a
surprise. 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) did have 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 consistently 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 indices were 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. The elevated level of TSW
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.
Despite a significant year × seeding rate interaction, white mold did
not intensify with rising seeding rates in any study year, which is contrary to
results of previous studies in irrigated peanut.
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