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Winter Wheat Planting Date Trial

Planting Date and Variety Effects on Winter Wheat Performance

Background

Winter grains have many advantages. Planting in the fall frees up time in the spring when wet weather can cause delays, winter grains can take up nitrogen remaining from a prior crop and protect the soil over the winter, and winter grains tend to produce greater yields than their spring counterparts. However, in Northern New England, most crops are not harvested until mid- to late-September and into October, while the ideal seeding window for winter wheat is considered to be mid-September.

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This trial was established to investigate whether some winter wheat varieties are more tolerant than others to late planting in the fall.

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Research Questions

Are some winter wheat varieties less sensitive to late fall planting than others?
Can increasing seeding rates compensate for late planting?

Trial Design and Treatments

Trials were established in Maine and Vermont in 2012 and 2013. The results presented here are for Maine only. Results from Vermont can be found at the UVM Extension Northwest Crops and Soils Program website.

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Table 1. Planting date, rate and varieties evaluated in the winter wheat planting date trial, in Maine in 2012 and 2013.

Winter wheat varieties Planting dates and seed rates 2012 2013 Arapahoe Maxine AC Morley Redeemer Harvard, 2012 only Sept 9 – 32 seeds/sq.ft. Oct 6 – 32 seeds/sq.ft. Oct 18 – 32 and 47 seeds/sq.ft Sept 15 – 32 seeds/sq.ft. Sept 24 – 32 seeds/sq.ft. Oct 5 – 32 seeds/sq.ft. Oct 18 – 32 and 47 seeds/sq.ft. Oct 26 – 32 and 47 seeds/sq.ft.

Planting Date Results (2012):

Note: In the graphs, treatments that have a letter in common are not statistically different from each other.

Weed Biomass

Weed pressure was relatively low in 2012.
Maxine and Redeemer were the only varieties that showed differences in weed biomass due to planting date.

Grain Yield

Weather conditions were favorable for winter grains in 2011-2012, which reduced the impact of late planting.
Arapahoe and Redeemer were unaffected by planting date.
Grain yields of Harvard, AC Morley, and Maxine were reduced by 24%, 19%, and 14%, respectively, by later planting.

Grain Protein

Grain protein was measured for ACMorley and Redeemer only
Grain protein increased with later planting dates but the reason why is unclear. Often protein and yield are negatively related, but that was not the case here.

Other Measures of Winter Wheat Performance

Variety and date Plant stand in late fall (#/sq ft) Plant vigor in early spring (Scored 1-5 with 5=best) Flowering date Plant height (inches) Spike number Test weight (lbs/bu) Arapahoe Sept 17 25 de 4.6 abc 7-June b 37 c 62 a 59.3 ab Oct 6 29 b 4.1 de 9-June c 34 d 55 ab 59.8 ab Oct 16 26 cd 3.4 f 12-June ef 34 d 48 bc 60.3 ab Harvard Sept 17 20 gh 4.5 bcd 5-June a 38 c 47 bc 61.7 a Oct 6 15 i 3.0 fd 10-June d 34 d 35 ef 61.3 ab Oct 16 14 i 2.1 h 12-June ef 33 d 35 ef 54.4 c AC Morley Sept 17 21 fg 4.6 abc 7-June b 48 a 56 ab 61.2 ab Oct 6 23 efg 3.4 f 10-June d 43 b 48 b 61.3 ab Oct 16 18 h 2.5 gh 13-June f 44 b 39 cde 59.0 b Maxine Sept 17 23 ef 5.0 a 6-June a 34 d 42 bcde 60.2 ab Oct 6 28 bc 4.3 cde 10-June d 32 e 36 e 60.7 ab Oct 16 28 bc 3.9 e 11-June ef 30 e 28 f 60.6 b Redeemer Sept 17 26 cd 4.6 abc 7-June b 38 c 47 bc 61.4 ab Oct 6 32 a 4.8 ab 10-June d 38 c 46 bcd 61.9 a Oct 16 31 a 4.1 de 11-June ef 38 c 38 de 61.8 a

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Seeding Rate Results (2012):

Increasing the seeding rate reduced weed biomass for all varieties, by an average of 21%
BUT increasing seeding rate had no effect on grain yields or protein

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