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Influence of 2 fertilizer levels on forage and crude protein yields of 7 tropical grasses


, : Influence of 2 fertilizer levels on forage and crude protein yields of 7 tropical grasses. Journal of Agriculture of the University of Puerto Rico 68(4): 471-478

Two levels of a commercial fertilizer, analysis 15-5-10, (intermediate 2240 and high 4480 kg/ha per yr) were evaluated for green forage (GF), dry forage (DF) and crude protein (CP) yields and dry matter (DM) content of slenderstem digit (Digitaria pentzii), common guinea (Panicum maximum), 'Makueni' (P. maximum) 'Coastcross-1' bermudagrass (Cynodon dactylon), callie (C. plectostachyus), stargrass (C. nlemfuensis var. niemfuensis) and carib (Eriochloa polystachya) grasses. Mean crude protein, P, K, Ca and Mg contents at the intermediate and high levels, respectively, were 7.6, 8.7, 0.29, 0.25, 1.97, 2.02, 0.45, 0.49 and 0.23, 0.24. Grasses were cut 17 times at a 45-day interval for 765 consecutive days. Mean DF yield for the 7 grasses increased 29% as a result of the higher fertilizer level. Significant differences in GF and CP yields occurred among grasses at the 2 fertilizer levels. At the intermediate fertilizer level, DF yields ranged from 22,364 to 34,717 kg/ha per yr for carib and slenderstem digitgrass, respectively. At the high fertilizer level, the variation was from 31,188 to 43,126 kg/ha per yr for carib and Makueni grasses, respectively. During the short cool days from Oct. 15, 1977 to Feb. 27, 1978, slenderstem digit and Makueni grasses significantly outyielded (P = 0.05) common guinea, star and carib grasses in total DF yields.

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