Double Crop Yields in 2015

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Planting Date Summary – 2013, 2014, 2015 – Lewiston-Woodville

Funded by the NCPGA

General comments:

The objectives are to determine the feasibility of double cropping major agronomic crops with wheat and to compare crop response to planting date within traditional planting date windows.

After the final year of the trial (2016) economic assessments will be made for all crops at various pricing structures. The design was a split plot with crops serving as the whole plot unit. With all crops in the same field with some randomization, a more detailed analyses can be run for direct comparisons. Summer crops were irrigated as needed. Crops were strip tilled at all planting dates.

For 2015, weather patterns, especially in September and early October, explain some of the key differences in yield. Cotton, corn, and milo (low yields with early planting) were affected by excessive rain during a period of time when the crop approached harvest and harvest was subsequently delayed. Peanut from the first panting date was dug just prior to rainfall “setting in” and vine health was adequate to minimize pod loss during combining, even though harvest was delayed. Peanut for the second planting date remained in the field well past optimum maturity resulting in significant pod shed prior to digging. Double-cropped peanut most likely did not have enough heat units to reach full yield potential, and a second wave of poor weather in late October prevented timely combining and most likely contributed to further pod loss and low yields.

Crop Planting date 2013 2014 2015
Peanut (lbs/acre) Early May 3340 a 3660 a 5590 a
Peanut Late May 3470 a 3690 a 3840 b
Peanut Late June 3070 a 2930 b 2030 c
Soybean (bu/acre) Early May 49 b 44 ab 44 a
Soybean Late May 63 a 45 a 43 a
Soybean Late June 40 b 37 b 32 b
Cotton (lbs sc/acre) Early May 1280 b 1140 a 520 c
Cotton Late May 1500 a 1100 a 820 a
Cotton Late June 560 c 490 b 630 b
Corn (bu/acre) Mid-April 160 a 113 b 79 b
Corn Mid-May 133 b 131 a 111 a
Corn Late June 94 c 67 c 65 c
Milo (bu/acre) Early May 102 a 78 a 74 a
Milo Late May 82 b 78 a 83 a
Milo Late June 79 b 28 b 73 a
Wheat (bu/acre) Mid-November 54 69 64

Article first appeared as North Carolina Peanut Note (PNNC-2015-169)