Effect of clipping interval and nitrogen fertilisation on oxalate content in pot-grown napier grass (Pennisetum purpureum)
Effect of clipping interval and nitrogen fertilisation on oxalate content in pot-grown napier grass (Pennisetum purpureum)
复制标题
刈割间隔和施氮肥对盆栽狼尾草草酸含量的影响
作者：
M. M. Rahman;Y. Ishii;M. Niimi;O. Kawamura
热带草有时含有足够浓度的草酸盐，以诱导食草动物的钙缺乏和毒性。采用盆栽试验研究了刈割间隔和施氮量对纳皮耶草草酸含量的影响。植物处理与2率（5和30 g/m2）的N肥（尿素），收获在3个修剪间隔（2，4和8周）。在所有刈割间隔期，牧草干物质产量和粗蛋白质含量均高于施氮水平（P 0.05）。这些结果表明，在我们使用的水平上使用尿素的N施肥不会导致纳皮耶草中草酸盐水平升高。收获在8周的时间间隔将降低草酸浓度，而不会导致低CP水平，提供中等氮肥率使用。
Tropical grasses sometimes contain oxalate in suffi cient concentrations to induce calcium defi ciency and toxicity in grazing animals. This pot study was undertaken to investigate the effects of clipping interval and N fertilisation on the oxalate concentrations in napier grass. Plants were treated with 2 rates (5 and 30 g/m 2 ) of N fertiliser (as urea) and harvested at 3 clipping intervals (2, 4 and 8 weeks). At all clipping intervals, both forage dry matter yield and crude protein concentration in the forage were greater (P 0.05) by level of N fertiliser applied. These results suggest that N fertilisation using urea at the levels we used will not result in elevated oxalate levels in napier grass. Harvesting at 8-weekly intervals will lower oxalate concentrations without resulting in low CP levels, provided moderate N fertiliser rates are used.