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PRECISION SIDEDRESS UAN APPLICATION FOR CORN PRODUCTION Kefyalew Girma Oklahoma State University Kefyalew Girma Oklahoma State University.

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Presentation on theme: "PRECISION SIDEDRESS UAN APPLICATION FOR CORN PRODUCTION Kefyalew Girma Oklahoma State University Kefyalew Girma Oklahoma State University."— Presentation transcript:

1 PRECISION SIDEDRESS UAN APPLICATION FOR CORN PRODUCTION Kefyalew Girma Oklahoma State University Kefyalew Girma Oklahoma State University

2 Nitrogen Leak Introduction

3 Introduction The common use of UAN for sidedress N application in corn is to apply this liquid fertilizer in the middle of rows using either dribble surface bands, or rolling coulter injection. O k l a h o m a S t a t e U n i v e r s i t y Coulter UAN application in corn (Ames, IA). UAN surface application is made within the center of the row, 15 inches away from the base of each stalk.

4 Introduction Excavated corn plants showing no overlapping of nodal root systems when corn plants were more than 10” apart, at silking growth stage O k l a h o m a S t a t e U n i v e r s i t y

5 Objective to compare three sidedress N placement methods on corn grain yield/where Evaluate sidedress N rates O k l a h o m a S t a t e U n i v e r s i t y Sense by plant and treat based on yield potential

6 Treatment structure of precision sidedress UAN experiment, Haskell and Lake Carl Blackwell, TrtPreSide d. Placement method Directed stream application at the base of each plant (1) Directed stream application at the base of a row (2) Dribble surface bands applied in the middle of two rows (3) NA Broadcast Broadcast O k l a h o m a S t a t e U n i v e r s i t y

7 By-plant By-row Between rows

8 O k l a h o m a S t a t e U n i v e r s i t y Directed Stream Applicator Directed stream application of UAN in corn applied at the base of stalk of the plant

9 Plot size 10’ x 20’ with 5’ alley By plant N rate was determined as: 1)Calculate UAN/row 2)Divide the above by number of plants/row O k l a h o m a S t a t e U n i v e r s i t y Design and Field Layout WE N S Location: Haskell III II I

10 Row Mean dry grain weight, lb/plant Percent of no. of plants with yield > meanRange, lb/plant Standard deviation lb/plant HaskLCHaskLCHasklLCHaskLC Prons O k l a h o m a S t a t e U n i v e r s i t y Between row and within row by plant corn grain weight variability at Haskell (Hask) and Lake Carl Blackwell (LC), OK, 2005.

11 Between row and within row by plant corn grain weight variability at Haskell (Hask) and Lake Carl Blackwell (LC), OK, Row Mean dry grain weight, lb/plant Percent of no. of plants with yield > mean Range, lb/plantStandard deviation lb/plant HaskLCHasklLCHaskLCHaskLC Pro ns O k l a h o m a S t a t e U n i v e r s i t y

12 Martin et al. (2005) Agron. J. 97: Regardless of yield level, plant-to-plant variability in corn grain yield can be expected and averaged more than 2765 kg ha-1 (44 bu/ac) over 46 sites (Ohio, Iowa, Nebraska, Virginia, Mexico, Argentina)

13 Effect of UAN sidedress placement method on corn grain yield O k l a h o m a S t a t e U n i v e r s i t y

14 Effect of sidedress N rates on corn grain yield O k l a h o m a S t a t e U n i v e r s i t y

15 Within row variability in grain yield was very high By plant sidedress application of N according to individual plant yield potential would result in improved efficiency and reduced cost to producers The gain in yields from the three methods ranged from 7 to 25% more than the broadcast treatment in three location-years Summary

16 O k l a h o m a S t a t e U n i v e r s i t y Under normal growing conditions, N should be sidedressed by plant at a rate of lb/A to maintain yield level and decrease loss in fertilizer N concurrent with within row plant to plant variability Results are not conclusive as the 2006 corn growing season was extremely dry/hot The experiment will be continued for 1 more year Summary

17 O k l a h o m a S t a t e U n i v e r s i t y Additional measurements such as ears per plant, 100-seed weight, ear size, plant spacing, and grain N concentration Summary

18 O k l a h o m a S t a t e U n i v e r s i t y


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