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For two years, the effect of three periods of cuttings (21, 42 and 63 days) on the production of dry matter and chemical composition of the grasses Brachiaria radicans, Napper; Hemarthria altissima, cv. 299995 (Poir) Stapf et Hubbard; Cynodon plectostachyus (K. Schum) Pilg; Setaria sphacelata (Schumach, Stapf and Hubbard); Cynodon sp.; Digitaria sp.; Panicum maximum Jacq.; Brachiaria ruziziensis, Germain et Everard, was studied. Fertilization was uniform (300-100-100 kg of N, P2O5 and K2O ha/year, respectively). Cuttings were made at 10 cm of height for C. plectostachyus, Cynodon sp. and Digitaria sp. and at 15 cm for the other species. The grasses P. maximum, S. sphacelata and B. ruziziensis produced the higher yields of dry matter (9.41, 8.85 and 8.46 t/ha/year, respectively), but it didn't differ from that of the grasses B. radicans, C. plectostachyus, Cynodon sp. and Digitaria sp. The production of H. altissima (2.73 t/ha/year) was significantly lower (P<.01) than the production of S. sphacelata, P. maximum and B. ruziziensis but it didn't differed from the productions reached by the grasses B. radicans, C. plectostachyus, Cynodon sp. and Digitaria sp. The production of dry matter didn't differ between the periods of cutting of 42 and 63 days; but both of them overcame significantly (P<.01) the period of 21 days. The studied chemical compounds (dry matter, rough protein, phosphorus, calcium and magnesium) showed diferences (P<.01) between species, time and period of cuttings. To conclude, the species S. sphacelata, B. ruziziensis and P. maximum produced the higher yields of dry matter; Cynodon sp., B. radicans and Digitaria sp. produced half yields, while C. plectostachyus and H. altissima produced the lowest yields. Most of the species produced more of the 90% of their yields in dry matter during the raining season. The best period of cutting for the species was 42 years, nevertheless, when the period of cutting was extended from 21 to 42 years, the content of dry matter and calcium had the tendency to increase, while the contents of rough protein, phosphorus and magnesium tended to decrease.
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| Format: | Digital revista |
| Language: | spa |
| Published: |
Instituto de Innovación Agropecuaria de Panamá
1983
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| Online Access: | http://www.revistacienciaagropecuaria.ac.pa/index.php/ciencia-agropecuaria/article/view/543 |
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