TY - JOUR AU - Caro-Costas, Rubén AU - Vicente-Chandler, José PY - 1972/07/01 Y2 - 2024/03/28 TI - Effect of Heavy Rates of Fertilization on Beef Production and Carrying Capacity of Napier Grass Pastures over 5 Consecutive Years of Grazing Under Humid Tropical Conditions JF - The Journal of Agriculture of the University of Puerto Rico JA - JAUPR VL - 56 IS - 3 SE - Articles DO - 10.46429/jaupr.v56i3.10828 UR - https://revistas.upr.edu/index.php/jaupr/article/view/10828 SP - 223-227 AB - Intensively managed Napier grass pastures on steep slopes in the humid mountain region of Puerto Rico grazed by young growing cattle over a 5-year period, produced an average of 947,1,281 and 1,582 pounds of gain in weight per acre yearly when fertilized annually with 1,600, 2,800 and 4,000 pounds of 14-4-10 fertilizer per acre, respectively. The pastures carried the equivalent of 2.22-, 2.89- and 3.58 six-hundred-pound steers per acre throughout the year and produced 6,890, 8,960 and 11,100 pounds of total digestible nutrients per acre yearly at the 1,600-, 2,800- and 4,000- pound fertilizer levels, respectively. Daily gains per head were not affected by level of fertilization, and averaged 1.31 pounds. At the 4,000-pound fertilizer rate the pastures maintained a minimum of 3 head per acre and produced 1,582 of liveweight worth about $475 at current prices or $315 above fertilizer costs. ER -