Some factors affecting the oxalate content of the tropical grass Setaria sphacelata
Some factors affecting the oxalate content of the tropical grass Setaria sphacelata
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影响热带禾本科植物狗尾草草酸含量的一些因素
DOI：
10.1071/ea9720400
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发表时间：
1972
影响因子：
--
通讯作者：
C. Ford
中科院分区：
文献类型：
--
作者：
Rj Jones;C. Ford
尿素对狗尾草草酸浓度的影响。Kazungula在三个实地试验中进行了研究。在秋季进行的第一次试验中，尿素使草酸盐浓度和阳离子浓度升高，草酸盐浓度与阳离子浓度呈线性关系（r = 0.90）。在秋季和春季进行的第二次试验中，草酸盐浓度随尿素率的增加而增加，随材料年龄的增长而下降。然而，在秋季再生中，尿素降低了幼龄再生中的草酸（至两周），但在较老的再生中，尿素使干物质中的草酸含量增加到6.0%的峰值。第三个试验证实了施用尿素后草酸盐浓度的增加，以及高剂量钾肥的影响，特别是以KCl施用时。草酸盐的植物部位排序为叶片b>叶鞘b>茎。种头中未检测到草酸盐。尿素增加了叶鞘、茎部草酸盐含量，但对叶片草酸盐含量影响较小。草酸含量高的品种卡统古拉和草酸含量低的品种南迪分蘖中草酸含量均呈现日变化趋势。草酸盐中90%是水溶性的。从狗尾草中分离到草酸钠和草酸钾，但未检出草酸铵。狗尾草中过量的阳离子浓度可能是草酸盐含量高的原因。
The effect of urea on the oxalate concentration of Setaria sphacelata CV. Kazungula was studied in three field experiments. In the first experiment conducted in autumn, urea increased oxalate and cation concentration, and the relation between oxalate and cation concentration was linear (r = 0.90). In the second experiment conducted over autumn and spring, there was a trend of increasing oxalate concentration with urea rate and a decline with age of plant material. However, in autumn regrowths, urea reduced the oxalate in young regrowth (to two weeks) but in older regrowths urea increased oxalate to a peak of 6.0 per cent in the dry matter. A third experiment confirmed the increased oxalate concentration following urea fertilization and also an effect of potassium at a high rate, especially when applied as KCl. The ranking of the plant parts for oxalate was-leaf blades > leaf sheaths > stems. No oxalate was detected in the seed heads. Urea increased the oxalate content of leaf sheaths and particularly of stems, but had less effect on the content in leaf blades. A diurnal trend in oxalate content of tillers occurred in both the high oxalate cultivar Kazungula and in the low oxalate cultivar Nandi. Of the total oxalate present, 90 per cent was water soluble. No ammonium oxalate was detected but both sodium oxalate and potassium oxalate were isolated from setaria. The high excess cation concentration in Setaria is probably the reason for the high levels of oxalate encountered with this grass.