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首页> 外文期刊>Revista Caatinga >SWARD STRUCTURE AND NUTRITIVE VALUE OF UROCHLOA RUZIZIENSIS UNDER NITROGEN AND POTASSIUM FERTILISATION
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SWARD STRUCTURE AND NUTRITIVE VALUE OF UROCHLOA RUZIZIENSIS UNDER NITROGEN AND POTASSIUM FERTILISATION

机译：氮钾肥作用下紫红色尿球菌的结构和营养价值

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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.
机译：这项研究旨在评估氮（N）和钾（K）施肥对2010/2011年夏季以及2011/2012年秋季，冬季，春季和夏季的Urochloa ruziziensis草料积累和营养价值的影响。使用了完整的随机区组设计，进行了四种处理（0、120、240和360 kg ha-1年-1 N和K2O）和五次重复。在SAS？的PROC MIXED下分析数据。评估了以下变量：草皮高度;饲料质量饲料堆密度叶片干物质，茎干物质和死物质干物质的百分比;叶片：茎比;干物质和粗蛋白的含量;干物质的体外消化率;中性洗涤剂纤维含量; ru鱼的木质素和木质素含量所有变量的氮和钾水平与季节之间存在相互作用。此外，氮和钾水平对草料积累速率，粗蛋白含量和干物质的体外消化率具有正线性影响，而这些水平对中性洗涤剂纤维和木质素含量具有负线性影响。在2011/2012年春季和夏季。氮，钾肥的施用量和每个季节的气候变化特征共同影响了尺zi鱼的积累和营养价值。氮肥和钾肥的施肥量高达360 kg ha-1 year-1，从而改善了zi草Urochloa的饲料积累和营养价值。

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