@article{Velez-Santiago_Arroyo-Aguilu_1983, title={Nitrogen Fertilization and Cutting Frequency, Yield and Chemical Composition of Five Tropical Grasses}, volume={67}, url={https://revistas.upr.edu/index.php/jaupr/article/view/7694}, DOI={10.46429/jaupr.v67i2.7694}, abstractNote={Five tropical forage grasses: Star (<em>Cynodon nlemfuensis</em>), Transvala digit (<em>Digitaria decumbens</em>), Pangola (<em>Digitaria decumbens</em>) and two Limpos (<em>Hemarthria altissima</em>, Bigalta and Greenalta), were cultivated without irrigation for 1.5 years at the Corozal Agricultural Experiment Substation to study the effects of 3 N fertilization levels and 3 harvest intervals (30, 45, and 60 days) on the green forage (GF), dry forage (DF), and crude protein (CP) yields and on the dry matter (DM), CP, P, and K contents. The soil is a Corozal clay (Uitisol). N levels, as (NH<sub>4</sub>)<sub>2</sub>SO<sub>4</sub>, applied after each harvest, included low, 224; medium, 448; and high, 896 kg/ha/yr. P and K were applied at rates of 112 and 336 kg/ha/yr, respectively. DM content and DF and CP yields increased significantly with longer harvest intervals. The medium N level resulted in the highest CP yields, except in the case of Star grass, in which high N fertilization gave greater CP yield. Bigalta, Star, and Transvala digit cultivars exhibited the highest GF, DF, and CP yields. DF yields (means across the 3 harvest intervals and the 3 N levels) for Bigalta, Greenalta, Transvala, Star, and Pangola grasses were 35,421; 29,209; 31 ,699; 32,383; and 24,461 kg/ha/yr, respectively.}, number={2}, journal={The Journal of Agriculture of the University of Puerto Rico}, author={Velez-Santiago, J. and Arroyo-Aguilu, J. A.}, year={1983}, month={Apr.}, pages={61–69} }