Precision Placement of Dairy Slurry to Supply N and P for Silage Corn.
Citation
Bittman, S., Hunt, D., Zhang, H. "Precision Placement of Dairy Slurry to Supply N and P for Silage Corn." 2016. ASA-CSSA-SSSA International Annual Meeting 2016-Phoenix, AZ, Nov. 6-9.
Résumé en langage clair
Corn silage benefits from starter fertilizer even when grown on high fertility soils receiving manure. Starter phosphorus can be supplied by liquid manure or slurry sludge if precision placed near corn rows. However injection of manure can cause increased risk of greenhouse gas emission and nitrate leaching. The study was conducted over 4 years in a moist maritime climate in south coastal BC, Canada. Manure was shallow injected into the soil at the same spacing as corn rows. Corn yields and nitrogen uptake with injected manure was superior to broadcast manure and approached commercial fertilizer but at somewhat higher nitrogen application rates. There was relatively little difference between manure and fertilizer for nitrogen leaching. The work shows that dairy manure can be used as an efficient source of starter nutrients for corn silage.
Résumé
Corn benefits from starter fertilizer even when grown on high fertility soils receiving manure. Starter P can be supplied by liquid manure or slurry sludge if precision placed near corn rows. However injection of manure can cause increased risk of N2 O emission and nitrate leaching, The study was conducted over 4 years in a moist maritime climate in south coastal BC, Canada, Manure was injected to 15 cm depth at 70 cm spacing a a few days corn was precision planted 0 to 10 cm from the corn rows. Corn was harvested fo silage and treatments were repeated for 4 years. Corn yields and N uptake with injected manure was superior to broadcast manure and approached commercial fertilizer but at somewhat higher N application rates. There was relatively little difference between manure and fertilizer for N leaching which persisted overwinter but N2O emissions were much greater for injected then broadcast manure or fertilizer however application of nitrification inhibitor DCD mitigated the emission peak after manure application.