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For a period of 3 years the effect of 0, 60, 120 and 180 kg/ha (X1) of increasing rates of nitrogen application, and 0, 14, 28 and 42 day (X2) resting periods on the chemical and botanical composition of a Faragua pasture under grazing, as well as the effect on the physical, and chemical composition of the soil, was studied. Significant (P<.01) yield reductions occurred in Faragua grass from early May 1976 to late December 1978. Greater losses in Faragua ocurred with 0 and 14 day resting periods associated with the maximun 180 kg/ha/year nitrogen application, suggesting that high rates of nitrogen impair Faragua growth. As the resting period surpasses 28 days, forage yield in the pasture increases. Intermediate rates of nitrogen (60 kg/ha/year) with long resting periods (42 days), and a grazing pressure of 5 kg DM/100 kg of liveweight suggest that the Faragua pasture tends to maintain its stability. Nitrogen rates and the resting periods significantly affected (P<.05) contents of crude protein, but not the phosphorus content in the grass. Soil chemical composition was not significantly affected (P>.05) by any variable; variations observed were due to other reasons. Values of soil apparent density in terms of soil compactation were not significantly affected (P>.05) as well, however an increase tendency was observed toward the end of the experiment.
| Main Authors: | , , , |
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| Format: | Digital revista |
| Language: | spa |
| Published: |
Instituto de Innovación Agropecuaria de Panamá
1990
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| Online Access: | http://www.revistacienciaagropecuaria.ac.pa/index.php/ciencia-agropecuaria/article/view/516 |
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