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Partiçăo da biomassa e de nutrientes na pastagem de Bahiagrass cv. Pensacola em diferentes sistemas de manejo com novilhos
| Content Provider | Semantic Scholar |
|---|---|
| Author | Grise, Márcia Mascarenhas |
| Copyright Year | 2005 |
| Abstract | Bahiagrass is the primary pasture species for beef cattle in Florida, and nutrient dynamics in bahiagrass pastures have important implications for livestock production systems and for the environment. This experiment evaluated a Pensacola Bahiagrass pasture (Paspalum notatum Flüggé var. saure Parodi Flüg). It was conducted near Gainesville, 29o43’ N, 82o20’ W, Florida, U.S.A to measure the effect of pasture management on mass and nutrient pool (kg ha) of herbage, litter, root+rhizome, and soil nutrient pools. Treatments were three continuously stocked (LOW, MODERATE, and HIGH, receiving 40, 120, and 360 kg N fertilizer ha yrand with stocking rates of 1.2, 2.4, and 3.6 AU ha, respectively) and one ROTATIONALLY stocked (RS; 7-d grazing and 21-d rest periods; N rate of 360 kg ha yr, 1 AU = 500 kg) pasture. The root+rhizome biomass has been 4 to 12 times greater than herbage biomass. There was no effect of treatment on root+rhizome biomass. The root+rhizome biomass had decreased during the grazing season. The greater management intensity imposed on HIGH and RS pastures resulted in greater herbage biomass. The root/herbage ratio decreased with the intensification of management. The litter biomass had been greater than herbage biomass in the HIGH and RS treatment, characterizing the different cycling pattern that goes through the animal excretions. The greater management intensity imposed on HIGH and RS pastures resulted in greater herbage, root+rhizome, and litter N pool. The greater management intensity imposed on RS pastures resulted in greater herbage C pool at the beginning of the grazing season. The greater management intensity imposed on RS pastures resulted in greater herbage K pool than other treatments. Treatments did not affect soil nutrient pool, but increasing management intensity tended to result in greater biomass and N, P, and K pool of the herbage fraction and greater root+rhizome and litter N pool. The greater management intensity imposed on HIGH ad RS pastures resulted in greater N, C and P deposition in the dung per day. The greater management intensity imposed on HIGH ad RS pastures resulted in greater K deposition in the dung per day, just in the end of the grazing system. The greater management intensity imposed on HIGH pastures resulted in greater N, C, P and K deposition in the dung per grazing season. Treatments neither affect herbage NDF or IVDOM, but increasing management intensity tended to result in high IVDOM and so better forage quality. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | https://acervodigital.ufpr.br/bitstream/handle/1884/2441/Tesedoutorado_MarciaGrise.pdf;jsessionid=D5F75ECF5D597C0422492CB805D0A632?sequence=1 |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
