Effect of Barley, Italian ryegrass and Legume Mixture on Nitrogen Fixation and Transfer to Grasses on Spring Paddy Field using Isotope Dilution and Difference Method

2016 ◽  
Vol 36 (4) ◽  
pp. 318-324
Author(s):  
Hyo-Won Lee ◽  
◽  
Hyo-Jin Lee ◽  
Won Ho Kim ◽  
Bong Ki Yoon ◽  
...  
Keyword(s):  
Nitrogen Fixation ◽  
Isotope Dilution ◽  
Difference Method ◽  
Paddy Field ◽  
Italian Ryegrass

scholarly journals Research Concerning Nitrogen Fixation in Fodder Systems Based on Italian Ryegrass

2012 ◽  
Vol 69 (1) ◽  
Author(s):  
Cristian GHIOCEL ◽  
Neculai DRAGOMIR ◽  
Roxana VIDICAN ◽  
Sebastian TOTH ◽  
Nicoleta MORARU
Keyword(s):  
Nitrogen Fixation ◽  
Nitrogen Balance ◽  
Red Clover ◽  
Italian Ryegrass ◽  
Agricultural System ◽  
First Year ◽  
Legume Species

In any agricultural system based on legumes, nitrogen balance should take into account the flow of N 2 by legume species. In this flow, the amount of N2 fixed by legumes is considered a reserve amount of nitrogen which, through harvesting, is removed from the nitrogen balance. The aim of the present paper is to assess the amount of nitrogen fixed biologically (NFB) in some legume species sowed in association and of the share of this amount of NFB of the total amount of nitrogen from the productions obtained. Thus, in the fodder system made up of Italian ryegrass + red clover cultivated for two years, the amount of NFB in the first year was 60 kg/ha. If we relate the amount of NFB to the amount of nitrogen exported through the fodder biomass, we see that the share of NFB varies between 22 and 42%.

The effects of ozone and nitrogen fertilizer on tall fescue, ladino clover, and a fescue–clover mixture. II. Nitrogen content and nitrogen fixation

1983 ◽  
Vol 61 (8) ◽  
pp. 2159-2168 ◽  
Author(s):  
Ruben A. Montes ◽  
Udo Blum ◽  
Allen S. Heagle ◽  
Richard J. Volk
Keyword(s):  
Nitrogen Fixation ◽  
Tall Fescue ◽  
Difference Method ◽  
Festuca Arundinacea ◽  
Ambient Air ◽  
N Fertilization ◽  
Dilution Method ◽  
N Fixation ◽  
The Difference ◽  
N Dilution Method

The effects of chronic doses of ozone (O3) and rates of nitrogen (N) fertilizer on N content of ladino clover (Trifolium repens L. cv. Tillman) and tall fescue (Festuca arundinacea Schreb. cv. Kentucky 31), and on N fixation by the clover were studied during the 1979 growing season. Plants of the two species were grown (i) in pots separately, (ii) together in open-top field chambers, and (iii) in ambient air plots. Mean 7 h/day (0930–1630 h eastern daylight time) O3 concentrations for the study period were 0.03 ppm in charcoal-filtered air chambers, 0.05 ppm in nonfiltered air chambers, 0.08 ppm in nonfiltered air chambers with O3 added for 7 h/day, and 0.05 ppm in ambient air. Shoot N concentrations (milligrams per gram dry weight) for clover and fescue were not modified by O3 exposures nor by N fertilization. Higher ozone levels led to reduced system N fixation (milligrams N per pot) by clover grown separately or together with fescue. Nitrogen fixation by ladino clover grown with tall fescue was 1.4 times greater than that by the clover grown alone. Nitrogen fixation by clover as estimated by the difference method was approximately 45% lower than N fixation as estimated by the 15N dilution method. Nitrogen fixation estimated by the difference method declined significantly with increasing N fertilization. This was not the case for N fixation estimated by the 15N dilution method.

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