Show Observation
User: Jarrod Rhoades
Created on: 2023-06-21
Observation Date 2023-06-20
Comment:
Fertilized LTER N-rate study (Irrigated and Non-irrigated fertility gradient study) Corn plots.
Fertilizer applications were with 28-0-0 which supplied 28% nitrogen in the form of Urea-Ammonium Nitrate (UAN).
A single pass of a 28% applicator was used to knife in the correct amount of fertilizer. The 28% applicator has seven coulters where the 5 inside coulters apply a full target rate and the 2 outside coulters apply half of the target rate. The applicator is controlled by a rate controller as well as inline orifices.
Fertilizer was knifed roughly 4 inches into the ground on the rainfed plots and 6-7 inches on the irrigated plots.
A reminder that 30 lbs of N/A was applied at planting so total N/A applied will include the 30 lbs N/A applied at planting time (planting date was May 13, 2023).
The amounts of nitrogen applied were as follows:
F1 (101, 203, 309, 404, 501, 603, 709, 804) 0 lbs N/A;
F2 (102, 202, 304, 406, 502, 602, 704, 806) 0 lbs N/A;
F3 (103, 205, 302, 407, 503, 605, 702, 807) 30 lbs N/A (10 gal/A);
F4 (104, 208, 305, 403, 504, 608, 705, 803) 60 lbs N/A (20 gal/A);
F5 (105, 204, 306, 401, 505, 604, 706, 801) 90 lbs N/A (30 gal/A);
F6 (106, 209, 308, 402, 506, 609, 708, 802) 130 lbs N/A (43.5 gal/A);
This was the first year we changed the F7, F8, & F9 amounts: In past years the amounts were: F7 180 lbs N/A, F8 220 lbs N/A, and F9 260 lbs N/A. In 2023 F7, F8, & F9 were changed to: F7 200 lbs N/A, F8 250 lbs N/A, and F9 300 lbs N/A. We were afraid that we were missing the top yield with the top N so the LTER Executive Committee decided to up the total amount of N applied per acre for the F7, F8, and F9 treatments.
F7 (107, 201, 307, 408, 507, 601, 707, 808) 170 lbs N/A (57 gal/A);
F8 (108, 207, 303, 405, 508, 607, 703, 805) 220 lbs N/A (73.5 gal/A);
F9 (109, 206, 301, 409, 509, 606, 701, 809) 270 lbs N/A (90 gal/A).
Equipment used: JD 7420b tractor and liquid fertilizer applicator that was built by the FSC that was equipped with a rate controller and inline orifices. Orifices were changed accordingly with the application rate and treatments.
Weather conditions at 10:10 a.m. were mostly sunny 70.6 degrees F, with 8-13 mph Northeast wind, relative humidity 58.3%.
Weather conditions at the end 2:30 p.m. sunny, 85 degrees F, with 11-17 mph Southeast wind, relative humidity 43.5%.
Areas:
Resource_Gradient-Irrigated Resource_Gradient_Non-Irrigated
Observation Type:
Fertilizer Application
Activities:
Attachments: