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vol.30 issue1PHOSPHOGYPSUM AND VINASSE APPLICATION: SOIL CHEMICAL PROPERTIES AND ALFALFA PRODUCTIVITY AND NUTRITIONAL CHARACTERISTICSTESTS FOR THE SELECTION OF FORAGE TURNIP PROGENY TO ORDER THE VIGOR AND LONGEVITY OF SEEDS author indexsubject indexarticles search
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Revista Caatinga

Print version ISSN 0100-316XOn-line version ISSN 1983-2125

Abstract

LIMA, KARLA RODRIGUES DE; CARVALHO, CARLOS AUGUSTO BRANDÃO DE; AZEVEDO, FLAVIO HENRIQUE VIDAL  and  MALAFAIA, PEDRO ANTONIO MUNINZ. SWARD STRUCTURE AND NUTRITIVE VALUE OF UROCHLOA RUZIZIENSIS UNDER NITROGEN AND POTASSIUM FERTILISATION. Rev. Caatinga [online]. 2017, vol.30, n.1, pp.220-229. ISSN 0100-316X.  http://dx.doi.org/10.1590/1983-21252017v30n124rc.

This study aimed to assess the effect of nitrogen (N) and potassium (K) fertilisation on the forage accumulation and nutritive value of Urochloa ruziziensis during the summer of 2010/2011 and autumn, winter, spring and summer of 2011/2012. A complete randomised block design with four treatments (0, 120, 240 and 360 kg ha-1 year-1 N and K2O) and five replicates were used. The data were analysed under the PROC MIXED of SAS®. The following variables were evaluated: sward height; forage mass; forage bulk density; percentages of leaf blade dry matter, stem dry matter, and dead material dry matter; leaf blade:stem ratio; contents of dry matter and crude protein; in vitro digestibility of dry matter; neutral detergent fibre content; and lignin content of Urochloa ruziziensis. There was an interaction between the N and K levels of fertilisation and the season for all variables. In addition, there was a positive linear effect of the N and K levels of fertilisation on the forage accumulation rate, the crude protein content and the in vitro digestibility of dry matter and a negative linear effect these levels on the neutral detergent fibre and lignin contents during the spring and summer of 2011/2012. N and K fertilisation and the climate changes characteristic of each season jointly affected the accumulation and nutritive value of Urochloa ruziziensis. N and K fertilisation up to 360 kg ha-1 year-1 improved the forage accumulation and nutritive value of Urochloa ruziziensis.

Keywords : Crude protein; Forage mass; Lignin; Neutral detergent fibre; Sward height..

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