TY - JOUR AU - Sotomayor-Ríos, Antonio AU - Torres-Cardona, Salvio AU - Quiles-Belén, Adolfo PY - 1985/07/01 Y2 - 2024/03/28 TI - Forage Sorghum Response to N Fertilization and Harvest Intervals JF - The Journal of Agriculture of the University of Puerto Rico JA - JAUPR VL - 69 IS - 3 SE - Articles DO - 10.46429/jaupr.v69i3.7361 UR - https://revistas.upr.edu/index.php/jaupr/article/view/7361 SP - 341-355 AB - Differences between locations, hybrids, N levels, cutting intervals and cuttings, and interactions of locations x hybrids, locations x N, locations x cutting intervals, locations x cuttings, cutting x N, and cutting intervals x N were significant for most traits in a study of the effect of N applications and cutting intervals on dry forage and crude protein yields, crude protein content, plant height and leaf area of three sorghum-sudangrass hybrids (<em>Sorghum bicolor</em> L. Moench) at two locations in Puerto Rico. Treatments included sidedressed N at 0, 80 and 160 kg/ha and three cutting intervals of 60, 75 and 90 days. Dry forage yields increased significantly with N fertilization, especially with the initial increment and with cutting intervals. Crude protein content was highest at 60 days and diminished as cutting interval increased. A three-way forage hybrid (A Tx624 x B Rhodesian sudan) x Common sudan produced the highest dry forage and crude protein yields and crude protein content compared with the single-crosses A Tx23 x Greenleaf sudan and A Tx624 x Common sudan. ER -