Effects of levels of nitrogen fertilizer on oxalate and some mineral contents in napiergrass (Pennisetum purpureum Schumach)
Effects of levels of nitrogen fertilizer on oxalate and some mineral contents in napiergrass (Pennisetum purpureum Schumach)
复制标题
氮肥水平对雷草草酸和部分矿物质含量的影响（Pennisetum purpureum Schumach）
DOI：
10.1111/j.1744-697x.2008.00117.x
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发表时间：
2008
影响因子：
1.3
通讯作者：
O. Kawamura
中科院分区：
文献类型：
--
作者：
M. M. Rahman;Y. Ishii;M. Niimi;O. Kawamura
在许多植物物种中，氮肥导致植物的草酸盐含量较高。各种热带草有时含有足够浓度的草酸盐，导致食草动物缺钙。本研究旨在研究增加氮素水平（0、10、30、60和90 g N m−2，使用尿素）对草草酸盐和某些矿物质含量的影响。矮-晚）。我们发现，总干物质产量随着施氮量的增加而显著增加（P < 0.001），但在30，60和90 g m−2的施氮水平之间没有观察到显著差异。除第三茬牧草的不溶性草酸含量随施氮水平的增加而显著增加（P < 0.05）外，其余各茬牧草的草酸含量均不随施氮水平的增加而增加。可溶性草酸含量与钾浓度呈正相关（r2 = 0.76，P < 0.001），不溶性草酸含量与钙、镁浓度呈正相关（r2 = 0.69，P <0.001）。研究表明，在种植狼尾草的过程中，当以尿素形式施用氮肥时，草酸的积累可能不是一个值得关注的问题。
In a number of plant species, nitrogen fertilization leads to a higher oxalate content of the plant. Various tropical grasses sometimes contain oxalate in sufficient concentrations to induce calcium deficiency in grazing animals. The present study was undertaken to investigate the effect of increasing level of N (0, 10, 30, 60 and 90 g N m−2 using urea) on oxalate and some mineral contents in napiergrass (cv. dwarf-late). We found that the total dry matter yield increased significantly (P < 0.001) with increasing N up to 30 g N m−2 applied, but no significant difference was observed among the N levels of 30, 60 and 90 g m−2. The oxalate content was not increased with increased levels of N fertilization in all cut forages, except for insoluble oxalate content at third-cut forage which increased significantly (P < 0.05) with increased level of N fertilizer. The content of soluble oxalate in plants was positively correlated (r2 = 0.76, P < 0.001) with potassium concentration, while the content of insoluble oxalate was positively correlated with calcium (r2 = 0.69, P < 0.001) and magnesium (r2 = 0.65, P < 0.001) concentrations. The study suggests that while applying N fertilizer as urea during cultivation of napiergrass, oxalate accumulation may not be a matter of concern.