02434naa a2200277 a 450000100080000000500110000800800410001902400560006010000160011624501460013226000090027852015850028765000210187265000150189365000120190865000110192065000250193165000240195665000150198065000130199565300180200870000180202670000180204470000130206277300810207515202772023-05-22       1978    bl uuuu     u00u1 u    #d7 ahttps://doi.org/10.1080/00288233.1978.104274042DOI1 aROSS, D. J.  aInfluence of fertiliser nitrogen on nitrogen fractions and nonstructural carbohydrates in grazed grass-clover herbage.h[electronic resource]  c1978  aContents of Nand nonstructural carbohydrate fractions were measured over a year in herbage from a grazed ryegrass-white clover pasture, which had been fertilised with limeammonium nitrate at an annual rate of 0 (No), 112 (N112), and 448 (N448) kg N/ha. Total N wntent of the mixed herbage was often greater than 4% dry weight, and was highest in earlY spring and lowest in late summer. Levels in many cuts were increased significantly by the N448 treatment; the N112 treatment had little effect. The non-protein N and nitrate N contents were also highest in the N448 herbage, particularly in early spring; the level of nitrate N was also high in autumn. Most of the nitrate N occurred in the grass component. Total watersoluble carbohydrates, and those soluble in hot water but insoluble in cold water, usually comprised less than 12% and 1% dry w¢ight respectively of the mixed herbage. Total water-soluble carbohydrates were negatively and significantly correlated with both total N ;;nd "protein" N contents. The total N/total water-soluble carbohydrate ratio was, with one exception, greater than 0.3. No clear seasonal trends in the carbohydrate fractions were evident. Effects due to N treatments were generally small although sometimes significant for lhe hot-water-soluble fraction. The highest level of fertiliser N brought about high total N/total water-soluble carbohydrate ratios, and high herbage nitrate N contents, namely 0.66% dry weight in early spring and an average of 0.45% in August-January. The implications of these results for animal health are discussed.  aFeed composition  aGrasslands  aGrazing  aLolium  aNitrogen fertilizers  aNonprotein nitrogen  aAdubação  aPastagem  aHerbage crops1 aMOLLOY, L. F.1 aCOLLIE, T. W.1 aBALL, R.  tNew Zealand Journal of Agricultural Researchgv. 21, n. 2, p. 231-239, 1978.