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 AS  Vol.6 No.9 , September 2015
Nitrogen Fertilization Impacts on Phosphorus Cycling in Grazed Grass-Legume Pasture
Abstract: The impact of different N regimes on P intake and excretion by grazing cattle and P return to soil from feces in a P-enriched pasture was investigated. Six 0.28-ha plots were over seeded with triticale (×Triticosecale rimpaui Wittm.) and crimson clover (Trifolium incarnatum) into tall fescue (Lolium arundinacea)/bermudagrass (Cynodon dactylon). Treatments included: 100% of N in split application, 50% of N in single application, and 0% of N. In summer, plots were over seeded with cowpea (Vigna unguiculata) and fertilizer treatments were applied. Forage intake was estimated from fecal excretion and fecal degradation and nutrient return to soil at 0, 28, 56, 84, and 112 days after application were determined. Forage P was not affected by season or treatment (P > 0.10); forage P mass was greater in cool than warm season. Phosphorus intake and water-soluble P output were not affected (P > 0.10) by season or treatment. Phosphorus output increased (P = 0.087) with increasing N in cool season, but not warm season. Soil P was greater (P < 0.0001) in warm than cool season. Feces remaining, P, and water-soluble P in feces were not affected by N treatment or season, but decreased (P < 0.10) with time. Sufficient P was returned to soil from feces to support forage growth, even in the absence of N fertilization. In a high-P pasture, N did not affect intake and fecal returns of P by cattle, foliar P uptake, nor rate and extent of assimilation of P into soil from feces.
Cite this paper: Dillard, S.L., Wood, C.W., Wood, B.H., Feng, Y.C., Owsley, W.F. and Muntifering, R.B. (2015) Nitrogen Fertilization Impacts on Phosphorus Cycling in Grazed Grass-Legume Pasture. Agricultural Sciences, 6, 1115-1127. doi: 10.4236/as.2015.69107.
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