Enhancing Continuous Corn Production Under High-Residue Conditions with Starter Fluid Fertilizer Combinations and Placements Gyles Randall Univ. of Minnesota,

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Presentation transcript:

Enhancing Continuous Corn Production Under High-Residue Conditions with Starter Fluid Fertilizer Combinations and Placements Gyles Randall Univ. of Minnesota, Waseca Fluid Fertilizer Forum, Scottsdale,

Justification Crop rotations are changing to meet rapid expansion of bio-fuel industry –C-C-S and other corn-intensive rotations –Large amounts of biomass are produced High amounts of surface residue keeps soil temps cool, which can reduce corn yield Farmers have tillage choices: –moldboard plow; increases potential for erosion –conservation; can the yield penalty be overcome with fluid starter fertilizers?

Objectives Determine the effects of fluid starter fertilizer placement and combinations of & on second-yr corn production under reduced tillage/high-residue conditions Provide management guidelines on placement and rates of UAN and APP for corn producers trying to meet the growing needs for corn grain by the ethanol industry and livestock producers. Present economic evaluation of fluid fertilizer treatments

Experimental Procedures Soil: Nicollet-Webster cl at So. Res. & Outreach Ctr., Waseca, MN Design: Split plot with main plots (60 x 50’) as tillage and sub-plots (10’ x 50’) as combinations of rates and placements of APP and UAN Tillage: Fall Moldboard plow 9” deep 14% surface residue (May 6) Fall Disk chisel/rip 9” deep 52% surface residue (May 6) STP: 21 ppm Bray P 1 (VH)

Starter Treatments PlacementAPPUAN gal/Alb N/A Zero control00 Popup50 2 x 050 “515 “530 “545

Weather Temps: Cool May-August, GDU’s 13% below normal and 28% above normal in September. Precipitation: Below normal each month from April – September. May-Sept. growing season = 11.0” or 9.42” (46%) below normal. Available soil water from mid-August thru Sept. ranged from 40 to 25% from FMC with >80% below 3’.

Results

Chisel 5 APP 2×0 No UAN Chisel No APP No UAN

Chisel 5 APP Pop-up No UAN Chisel 5 APP 2×0 No UAN

Chisel No APP No UAN Chisel 5 APP 2×0 10 UAN

Chisel 5 APP Pop-up No UAN

Chisel 5 APP 2×0 15 UAN Chisel 5 APP 2×0 5 UAN

Moldboard No APP No UAN Moldboard 5 APP 2×0 10 UAN

Moldboard 5 APP 2×0 5 UAN Moldboard 5 APP 2×0 No UAN

Interactions There were no significant (P=0.05 level) interactions between Tillage System and Starter Treatment except for grain moisture. - thus, main effects are valid for all except grain moisture.

Effect of tillage on small whole plant (V7) growth and uptake of N and P in DMUptake TillageYieldNP lb/A lb/A Moldboard Chisel/rip P > F:

Effect of starter treatments on small whole plant (V7) growth and uptake of N and P in Starter TreatmentDMUptake PlacementAPPUANYieldNP gal/Alb N/Alb/A- - lb/A - - Zero-control Popup x “ “ “ LSD (0.10):

Effect of tillage on grain yield and moisture and uptake of N and P in GrainUptake TillageYieldMoistureNP bu/A%- - - lb/A Moldboard Chisel/rip P > F:

Effect of starter treatments on grain yield and uptake of N and P in Starter TreatmentGrainUptake PlacementAPPUANYieldNP gal/Alb N/Alb/A- - - lb/A Zero-control Popup x “ “ “ LSD (0.10):NS

Grain moisture as affected by tillage and starter fertilizer in Starter TreatmentTillage PlacementAPPUANM. PlowChisel/rip gal/Alb N/A % Zero-control Pop-up x “ “ “

Conclusions Moldboard plow tillage increased early plant growth (V7) by 46% and grain yield by 11 bu/A. N and P uptake was increased in the V7 plant by 55 and 48%, respectively, by moldboard plow tillage but uptake in the grain was not affected by tillage Grain moisture at harvest for chisel/rip tillage (34.8%) was decreased about 3 points by APP + UAN, but for moldboard tillage (31.0%) starter fertilizer had no effect. Pop-up placement of APP was most effective. Tillage:

Conclusions In-furrow, pop-up placement of APP increased early growth (V7 stage) over the no-starter control by 150% for chisel/rip tillage and 93% for moldboard tillage. Averaged across tillage systems pop-up and 2 x 0 dribble placement of APP increased early growth over the no-starter control by 114 and 42%, respectively. Adding UAN to 2 x 0 placed APP increased early growth by 25% when averaged across N rates and tillage. In-furrow, pop-up placement of APP increased early growth over the 2 x 0 dribble placement of APP + 45 lb N/A as UAN by 12%. Grain yields were not influenced by starter fertilizer in this year when precipitation and soil moisture were limiting. Starter fertilizers:

Three-Year Results

Effect of tillage on average small plant (V7) growth and uptake of N and P in DMUptake TillageYieldNP lb/A lb/A Moldboard Chisel/rip P > F:0.001 No Year x Tillage interaction

Effect of tillage on average grain yield and moisture in 2007 – Grain TillageYieldMoisture bu/A% Moldboard Chisel/rip P > F Year x Tillage interaction was significant.

Effect of starter treatments on average small whole plant (V7) growth and grain yield in Starter TreatmentDMGrain PlacementAPPUANYield gal/Alb N/Alb/Abu/A Zero-control Popup x “ “ “ LSD (0.10):464.3 A significant Yr x Starter interaction for all

Three-Year Conclusions Moldboard plowing increased early plant growth by 29% and grain yield by 6.5 bu/A compared to chisel/rip tillage. APP placed in the seed furrow as a pop-up or combined with UAN and dribbled on the soil surface increased early plant growth by 3 to 45% and grain yield by 1 to 7 bu/A on these very high P-testing soils.

Acknowledgement Grateful appreciation is given to A & L Great Lakes Laboratories, Inc., Fort Wayne, IN and Olsen’s Agricultural Laboratory, Inc., McCook, NE for conducting the plant analysis during this study and to the Fluid Fertilizer Foundation for their financial assistance.

Thanks Gyles Randall