Meadow Fescue, Tall Fescue, and Orchardgrass Response to Nitrogen Application Rate
2009
Brink, Geoffrey E. | Casler, Michael D.
Nitrogen has a greater effect on grass growth than any other factor except moisture and temperature. As N costs continue to increase, understanding grass response to nitrogen will help producers determine the most appropriate application rate. Five N rates (0, 60, 120, 180, and 240 lb/acre) were split-applied to meadow fescue, soft-leaf tall fescue, and orchardgrass in three equal applications at two Wisconsin locations in 2005 and 2006. Plots were harvested to a four-inch stubble when sward height reached 10 to 12 inches to represent a typical defoliation scheme for managed grazing. Annual yield and herbage protein concentration of all varieties increased linearly as N application rate increased in all environments. In contrast, N-use efficiency (yield produced per unit of N applied) increased from 15 lb DM/lb N to 20 lb DM/lb N as rate increased from 60 to 120 lb/acre/year, but declined as N rate increased above 120 lb/acre/year. Although meadow fescue varieties produced less annual yield than tall fescue and orchardgrass by the second year, meadow fescue varieties generally had greater cell wall digestibility at each harvest.
اظهر المزيد [+] اقل [-]الكلمات المفتاحية الخاصة بالمكنز الزراعي (أجروفوك)
المعلومات البيبليوغرافية
تم تزويد هذا السجل من قبل National Agricultural Library