EFFECTS OF FREQUENCY OF APPLICATION OF N-15 TRACER AND RATE OF FERTILIZER NITROGEN APPLIED ON ESTIMATION OF NITROGEN-FIXATION BY AN ESTABLISHED MIXED GRASS CLOVER PASTURE USING THE N-15-ENRICHMENT TECHNIQUE

被引:13
作者
COOKSON, P
GOH, KM
SWIFT, RS
STEELE, KW
机构
[1] LINCOLN UNIV,DEPT SOIL SCI,CANTERBURY,NEW ZEALAND
[2] UNIV READING,DEPT SOIL SCI,READING RG6 2AH,BERKS,ENGLAND
[3] MINIST AGR & FISHERIES TECHNOL,WELLINGTON,NEW ZEALAND
关键词
!sup]15[!/sup]N tracer; Clover plants; Fertiliser; Isotopic dilution technique; Nitrogen; Nitrogen fixation; Pasture; Whiteclover;
D O I
10.1080/00288233.1990.10428419
中图分类号
S [农业科学];
学科分类号
09 ;
摘要
A field experiment was conducted to determine the effect of frequency of 15N tracer applications on the estimation of nitrogen (N) fixed by clover plants in an established mixed grass/clover pasture using the 15-enrichment technique. The results obtained showed that N derived from the atmosphere (%Ndfa) significantly decreased when 15N tracer was applied daily (87.2%) or at a 30-day interval (76.3%), after the first 30 days of regrowth. This effect did not persist at a further harvest, except on pastures treated with 150 kg N/ha of unlabelled fertiliser N. The estimate of the amount of N fixed was not significantly affected by the frequency of 15N applications but decreased from 36.7 to 19.8 kg N/ha after 60 days with fertiliser N application (150 kg N/ha). The mean daily rate of N fixation increased in the zero N treatment from 0.89 kg N/ha per day during the first 30 days regrowth to 1.36 kg N/ha per day during a subsequent 30 days of uninterrupted growth. Overall, the results showed that the 15N enrichment technique adequately estimated the amounts of clover N fixed in an established pasture under field conditions. © 1990 Taylor & Francis Group, LLC.
引用
收藏
页码:271 / 276
页数:6
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