+ Site Statistics
+ Search Articles
+ PDF Full Text Service
How our service works
Request PDF Full Text
+ Follow Us
Follow on Facebook
Follow on Twitter
Follow on LinkedIn
+ Subscribe to Site Feeds
Most Shared
PDF Full Text
+ Translate
+ Recently Requested

Effects of frequency of application of nitrogen 15 tracer and rate of fertilizer nitrogen applied on estimation of nitrogen fixation by an established mixed grass clover pasture using the nitrogen 15 enrichment technique



Effects of frequency of application of nitrogen 15 tracer and rate of fertilizer nitrogen applied on estimation of nitrogen fixation by an established mixed grass clover pasture using the nitrogen 15 enrichment technique



New Zealand Journal of Agricultural Research 33(2): 271-276



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 15N-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 fertilizer 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.

Please choose payment method:






(PDF emailed within 1 workday: $29.90)

Accession: 007275063

Download citation: RISBibTeXText


Related references

Effects of frequency of application of 15 N tracer and rate of fertiliser nitrogen applied on estimation of nitrogen fixation by an established mixed grass/clover pasture using the 15 N-enrichment technique. New Zealand Journal of Agricultural Research 33(2): 271-276, 1990

Effects of cutting frequency and nitrogen rate on mixed grass clover sward 2. efficiencies of cutting and nitrogen botanical composition content and percentage recovery of nitrogen. Korean Journal of Animal Science 23(6): 454-460, 1981

Estimation of symbiotically fixed nitrogen in field grown soybeans an application of natural nitrogen 15 nitrogen 14 abundance and a low level nitrogen 15 tracer technique. Plant & Soil 93(2): 269-286, 1986

Nitrogen fixation in a white clover fescue pasture using three methods of nitrogen 15 application and residual nitrogen 15 uptake. Agronomy Journal 80(2): 265-268, 1988

Residual effects of autumn applied nitrogen fertilizer and the interaction with spring applied nitrogen on a grass-clover sward. Proceedings of the New Zealand Grassland Association 46: 240, 1985

Responses of pasture grasses to nitrogen fertilization 3. effect of nitrogen fertilizer rate leaf nitrogen concentration and chlorophyll content on photosynthetic activities of some subtropical grass species. Grassland Science 25(2): 121-127, 1979

The effects of ozone and nitrogen fertilizer on tall fescue, ladino clover, and a fescueclover mixture. Ii. Nitrogen content and nitrogen fixation. Canadian Journal of Botany 61(8): 2159-2168, 1983

Studies on the responses of pasture grasses to nitrogen fertilization. 3. Effect of nitrogen fertilizer rate, leaf nitrogen concentration and chlorophyll content on photosynthetic activities of some subtropical grass species. Journal of Japanese Society of Grassland Science 25(2): 121-127, 1979

The effects of ozone and nitrogen fertilizer on tall fescue festuca arundinacea ladino clover trifolium repens and a fescue clover mixture 2. nitrogen content and nitrogen fixation. Canadian Journal of Botany 61(8): 2159-2168, 1983

Influence of fertilizer nitrogen on herbage dry matter and nitrogen yields and botanical composition of a grazed grass clover pasture. New Zealand Journal of Agricultural Research 21(1): 47-56, 1978

The effect of nitrogen fertilizer on clover trifolium repens nitrogen fixation in an intensively grazed manawatu pasture new zealand. New Zealand Journal of Experimental Agriculture 10(4): 395-400, 1982

Effect of early season nitrogen on nitrogen fixation and fertilizer-use efficiency in grass-clover pastures. Communications in soil science and plant analysis2(15-16): 2425-2437, 2001

Yield response, residual nitrogen and clover content of an irrigated grass-clover pasture as affected by various rates and frequencies of nitrogen application. Agron Jour 54(3): 212-214, 1962

The response of grass-clover and pure-grass leys to irrigation and fertilizer nitrogen treatment II Clover and fertilizer nitrogen effects. J Agr Sci: 109-119, 1965

Nitrogen 15 tracer studies on nitrogen supply from different nitrogen fertilizer forms and on localization and losses of fertilizer nitrogen pot experiment in haplic chernozem. Archiv fuer Acker- und Pflanzenbau und Bodenkunde 32(9): 583-590, D, 1988