Grass Forage Response to Broadcast or Surface-Banded Liquid Dairy Manure and Nitrogen Fertilizer
- Jeffrey E. Cartera,
- William E. Jokela *b and
- Sidney C. Bosworthc
Manure can provide valuable nutrients, especially N, for grass forage, but N availability is limited because of high NH3 volatilization losses from standard surface-broadcast application. Field experiments were conducted for 2 yr at two sites in Vermont to evaluate effects of broadcast or banded liquid dairy manure and broadcast N fertilizer on grass yield and N utilization. Treatments were applied to orchardgrass (Dactylis glomerata L.) on a well-drained silt loam and to reed canarygrass (Phalaris arundinacea L.) on a somewhat poorly drained clay soil. Manure was applied three or four times per year at rates of 25 or 50 m3 ha−1 either by broadcasting or by trailing-foot spreading in narrow bands. Fertilizer N was broadcast at 0, 28, 56, and 84 kg N ha−1 on separate plots at the same time as each manure application. Fertilizer N increased yields significantly to the medium rate (224 kg ha−1 yr−1) on orchardgrass and the high rate (252 kg ha−1 yr−1) on the reed canarygrass site. The high rate of banded manure produced 80 to 110% of the yields from the high N fertilizer rate. Yields from the trailing-foot, banded manure application were 6 to 14% higher than those from broadcast manure in the two site-years where method had a significant effect. Fertilizer N equivalence of manure averaged 44% with banded and 34% with broadcast application. We conclude that surface-banding manure with a trailing-foot applicator has the potential to provide benefits over conventional broadcast application by improving N utilization and increasing yield.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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