Interactive effects of nitrogen and potassium fertilization on oxalate content in napiergrass (Pennisetum purpureum)
Interactive effects of nitrogen and potassium fertilization on oxalate content in napiergrass (Pennisetum purpureum)
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DOI：
10.5713/ajas.2010.90541
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发表时间：
2010-04
期刊：
影响因子：
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通讯作者：
M. M. Rahman-M.;Y. Ishii;M. Niimi;O. Kawamura
中科院分区：
文献类型：
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作者：
M. M. Rahman-M.;Y. Ishii;M. Niimi;O. Kawamura
采食含有大量可溶性草酸盐的饲料可导致牲畜缺钙，甚至死亡。施肥是提高牧草产量和营养品质最实用、最有效的方法之一。研究了不同施钾水平（150、300和600 kg/ha）和施氮水平（150、300和600 kg/ha）对狼尾草（Pennisetum purpureum）草酸积累的影响。施氮300 kg/hm 2的干物质产量高于施钾150或600 kg/hm 2，而施钾对产量无影响。总的来说，施氮对可溶性和总草酸含量没有影响，但对不溶性草酸含量影响较小。随着施钾水平的提高，可溶性草酸含量呈上升趋势，不溶性草酸含量呈下降趋势，而总草酸含量相对稳定。氮、钾肥对可溶性和不溶性草酸含量的交互作用显著。在高水平（600 kg/ha）的钾的应用中，被发现在300 kg/ha的N水平的可溶性草酸含量增加最大。不溶性草酸含量增加最大的氮水平在600公斤/公顷的低水平（150公斤/公顷）的钾的应用。这些结果表明，施肥控制牧草中可溶性和不溶性草酸组分含量的可能性。
Ingestion of forage containing a large quantity of soluble oxalate can result in calcium deficiency and even death of livestock. Fertilization is one of the most practical and effective ways to improve yield and nutritional quality of forage. An experiment was conducted to determine the effects of nitrogen (N) fertilization (150, 300 and 600 kg/ha) across varying levels (150, 300 and 600 kg/ha) of potassium (K) on oxalate accumulation in napiergrass (Pennisetum purpureum). Application of N at 300 kg/ha produced higher dry matter yield than at 150 or 600 kg/ha, while K fertilization had no effect on yield. In general, N fertilization did not affect the soluble and total oxalate contents, but slightly affected the insoluble oxalate content. Soluble oxalate content showed an increasing trend and insoluble oxalate content showed a decreasing trend with increasing K level, but total oxalate content remained relatively constant. There were significant interactions between N and K fertilization for the content of soluble and insoluble oxalate fractions. The greatest increase in soluble oxalate content with N level at 300 kg/ha was found at the high level (600 kg/ha) of K application. The greatest increase in insoluble oxalate content with N level at 600 kg/ha was found at the low level (150 kg/ha) of K application. These results indicated the possibility of controlling the content of soluble and insoluble oxalate fractions in forage by fertilization.