1 / 12

Exploratory Research in Corn and Wheat - Virginia

Exploratory Research in Corn and Wheat - Virginia. 0.9. 7. 0.8. 6. 0.7. 5. 0.6. NDVI. 0.5. Yield, Mg ha -1. 4. 0.4. 3. 0.3. 2. 0.2. 0.1. 1. 0. 0. 0. 0.001. 0.002. 0.003. 0.004. 0.005. 0.006. 0.007. Tiller Density. Predicted Yield Index. 0. 500. 1000. 1500. 2000.

joel-holden
Télécharger la présentation

Exploratory Research in Corn and Wheat - Virginia

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Exploratory Research in Corn and Wheat - Virginia

  2. 0.9 7 0.8 6 0.7 5 0.6 NDVI 0.5 Yield, Mg ha-1 4 0.4 3 0.3 2 0.2 0.1 1 0 0 0 0.001 0.002 0.003 0.004 0.005 0.006 0.007 Tiller Density Predicted Yield Index 0 500 1000 1500 2000 Previous Virginia Research • Spring N rates for VA wheat production can be determined using spectral reflectance sensors and applied at a 4-ft2 resolution using commercial equipment

  3. Standard VA Rotation(3 crops in 2 years) No-tillCorn Conv.-tillWheat No-tillDCSoybean

  4. Objectives • Refine current methods of determining variable topdress N rates and incorporate foliar P recommendations into fertilization algorithms for wheat using sensor-based technology • Develop a sensor-based N and P fertilization strategy for Virginia corn production • Evaluate the benefits of foliar P applications for wheat and corn production

  5. TREATMENT STRUCTURE Trt GS 25 N GS 30 N Resolution ------- lb N / acre ------- 1 0 0 NONE 2 30 60 FLAT RATE 3 0 120 FLAT RATE 4 60 60 FLAT RATE 5 120 0 FLAT RATE 2 6 0 NFOA 1 m 2 7 TILLER NFOA 1 m 8 TILLER TISSUE FLAT RATE 2 2 13 9 0 0 NFOA2 NFOA3 1 m 1 m 2 2 Year 2 10 14 TILLER TILLER NFOA2 NFOA3 1 m 1 m 2 2 15 11 0 0 NFOA2+PFOA1 NFOA3+PFOA2 1 m 1 m 2 2 16 12 TILLER TILLER NFOA3+PFOA2 NFOA2+PFOA1 1 m 1 m Year 3 Experimental Procedures - Obj. 1 • 6 site years (2 in each of 3 yr) • RCBD; 3 replications

  6. Experimental Procedures - Obj. 2 • 12 site years (4 sites in each of 3 yr) • Irrigated and non-irrigated • Conventional and no till • RCBD; 3 replications • Preplant N (0 to 240 lb N/acre) • Starter N (0 to 70 lb N/acre) • Sidedress N (0 to 150 lb N/acre) • Plots will be fertilized and harvested using conventional plot equipment

  7. Experimental Procedures - Obj. 2 Spectral measurements collected from canopy at V4, V6, V8, and V10 Chlorophyll and tissue N and P will be measured at same growth stages A PSNT will be conducted for each treatment prior to sidedress N applications at V6

  8. 180 150 Dryland, No N 120 Irrigated, No N Yield, bu/acre 90 Dryland, Added N 60 Irrigated, Added N 30 0 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 NDVI, V8 Preliminary Results - Obj. 2

  9. Foliar P Applications in Virginia • Determine from soil test • Residual P can carry over from starter application to previous crops • P can be banded with wheat crop

  10. Foliar P Application Preplant P2O5 Tiller Density Grain Yield -- lb/acre -- -- tillers/ft2 -- -- bu/acre -- 0 50 83 30 70 85 60 80 96 90 95 93 120 95 95 Foliar P No preplant P 90 lb P2O5 -- lb P2O5/acre -- -- bu/acre -- -- bu/acre -- 0 77 90 4 84 90 8 84 93 12 87 98 PHOSPHORUS RESPONSE

  11. Experimental Procedures - Obj. 3 • 12 site years (4 sites in each of 3 yr) • 2 corn and 2 wheat • No till • Preplant P STP 1/3 STP 2/3 STP • Foliar P rates 0, 4, 8, and 12 lb P2O5/acre for wheat (double for corn) • Applied at GS30 or V6

  12. Expected Results • Virginia producers will have the knowledge required to implement existing variable-rate fertilizer technology into standard cash grain production systems • Grain yields will increase by applying nutrients at the resolution where variability exists • Nitrogen use efficiency will increase 30 to 50% while soil-applied P fertilizer will be reduced 50 to 100%

More Related