Abstract 448

Gonzalez,SB; Ramos,-N; Sanchez,-M

Instituto de Ciencia Animal, San Jose de las Lajas, Havana, Cuba.

Cuban-Journal-of-Agricultural-Science. 1983, 17: 2, 213-221; 16 ref.

The effect of 0, 200 or 400 kg N/ha annually on the mineral composition of Cynodon nlemfuensis cv. Jamaican and Panamanian and C. dactylon cv. Coast Cross 1, Coast Cross 2 and Coastal was studied during the dry season. There were significant differences in P content between spp. and N rates, Jamaican having the highest percentage (0.425%). P content tended to decrease with rate of applied N. There was an interaction between spp. and N rate for K, Ca, Mg, Cu and Fe. The spp. studied had the lowest K content with 400 kg N/ha except for Coast Cross 2. The effect of applied N on Ca and Mg contents was small. The highest Cu content was obtained with 400 or 200 kg N/ha according to cv. and spp. Generally Jamaican had the highest P, K, Cu and Fe contents. Cu and Fe contents of these spp. could be a limiting factor in animal nutrition.