Influence of Nitrogen Form Supply on Soil Mineral Nitrogen Dynamics, Nitrogen Uptake, and Productivity of Sugarcane

2015 ◽  
Vol 107 (2) ◽  
pp. 641-650 ◽  
Author(s):  
Eduardo Mariano ◽  
José M. Leite ◽  
Michele X. V. Megda ◽  
Luis Torres-Dorante ◽  
Paulo C. O. Trivelin
Keyword(s):  
Nitrogen Uptake ◽  
Nitrogen Dynamics ◽  
Mineral Nitrogen ◽  
Nitrogen Form ◽  
Soil Mineral ◽  
Soil Mineral Nitrogen

Soil mineral nitrogen dynamics following repeated application of dairy slurry

2016 ◽  
Vol 67 (6) ◽  
pp. 804-815 ◽  
Author(s):  
D. Cavalli ◽  
P. Marino Gallina ◽  
D. Sacco ◽  
L. Bechini
Keyword(s):  
Nitrogen Dynamics ◽  
Mineral Nitrogen ◽  
Repeated Application ◽  
Soil Mineral ◽  
Soil Mineral Nitrogen

In situ ion exchange resin membrane (IEM) technique to measure soil mineral nitrogen dynamics in grazed pastures

2007 ◽  
Vol 44 (6) ◽  
pp. 805-813 ◽  
Author(s):  
Saman Bowatte ◽  
Russell Tillman ◽  
Andrew Carran ◽  
Allan Gillingham ◽  
David Scotter
Keyword(s):  
Ion Exchange ◽  
Exchange Resin ◽  
Ion Exchange Resin ◽  
Nitrogen Dynamics ◽  
Mineral Nitrogen ◽  
Soil Mineral ◽  
Soil Mineral Nitrogen ◽  
Grazed Pastures ◽  
Resin Membrane

Importance of mineral nitrogen in the subsoil to yield and uptake of nitrogen by wheat in southern New South Wales

1988 ◽  
Vol 28 (2) ◽  
pp. 215
Author(s):  
AC Taylor ◽  
WJ Lill ◽  
AA McNeill
Keyword(s):  
Nitrogen Uptake ◽  
Dry Matter ◽  
New South ◽  
New South Wales ◽  
Mineral Nitrogen ◽  
Soil Mineral ◽  
Soil Mineral Nitrogen ◽  
South Wales ◽  
Nitrogen Concentrations

Dry matter and nitrogen uptake of wheat tops at flowering, dry matter and nitrogen of wheat grain at maturity, and soil mineral nitrogen (0-90 cm) at sowing and flowering, were measured at 68 sites (1 experiment per site in 5 Shires) in southern New South Wales to test the hypotheses that: (i) mineral nitrogen below 30 cm would improve the prediction of wheat yields, (ii) soil mineral nitrogen would be better indicated by wheat yields at flowering than those at maturity, and (iii) soil mineral nitrogen would be better indicated by nitrogen uptake by wheat than by dry matter yields. Mineral nitrogen concentrations in soil at depths greater than 30 cm did not improve the prediction of wheat attributes, but hypotheses (ii) and (iii) were validated. Curvilinear regressions, significant (P< 0.05) on 2 occasions, were not important in this study. The best regression of wheat dry matter at flowering against soil mineral nitrogen at sowing was a single straight line, but the best models for the other 3 wheat variables were all bilinear. The best of the latter related the uptake of nitrogen by wheat at flowering to mineral nitrogen in the soil at sowing as follows: FNUH = (31.6 � 5.9) + (0.892 � 0.110) TMNS30 and FNUL = (9.7 � 7.3) + (0.892 � 0.110) TMNS30 where FNUH is nitrogen uptake by wheat at flowering (kg/ha) in 1960, 1964 and 1966 (when Shire wheat yields were above the Shire's long term average), FNUL is nitrogen uptake by wheat at flowering (kg/ha) in 1961, 1965 and 1974 (when Shire wheat yields were below the Shire's long term average), and TMNS30 is total mineral nitrogen (0-30 cm) (kg/ha) at sowing.

The Nitrogen Dynamics of Multi-species Grasslands when Subject to Drought and Re-wetting.

2020 ◽  
Author(s):  
Saoirse Cummins ◽  
John Finn ◽  
Gary Lanigan ◽  
Karl Richards ◽  
Tom Misselbrook ◽  
...  
Keyword(s):  
Management Strategies ◽  
Background Level ◽  
Fertilizer Application ◽  
Nitrogen Dynamics ◽  
Mineral Nitrogen ◽  
Soil Mineral ◽  
Soil Mineral Nitrogen ◽  
Mineral N ◽  
Legacy Effect ◽  
Birch Effect

&lt;p&gt;It is predicted that climate change will result in more extreme and frequent weather events including flooding and drought. Nitrous oxide (N&lt;sub&gt;2&lt;/sub&gt;O) is a potent greenhouse gas having 298 times the global warming potential of CO&lt;sub&gt;2&lt;/sub&gt;. The &amp;#8216;Birch effect&amp;#8217;, the term given to high &amp;#160;N&lt;sub&gt;2&lt;/sub&gt;O fluxes following the drying and re-wetting of soils, is an accelerator of this process. Multi species grasslands have been shown have higher nitrogen use efficiency and potential for drought resilience and recovery. This experiment analysed the nitrogen dynamics of multi-species grasslands by means of quantifying the responses of soil mineral nitrogen (NH&lt;sub&gt;4&lt;/sub&gt;&lt;sup&gt;+&lt;/sup&gt; and NO&lt;sub&gt;3&lt;/sub&gt;&lt;sup&gt;-) &lt;/sup&gt;and N&lt;sub&gt;2&lt;/sub&gt;O fluxes during an eight week simulated drought, re-wetting and fertiliser application two weeks after the re-wetting event. A simplex experimental design was used to determine species and functional group effects which could potentially influence responses. The hypothesis of this study was therefore that multi species grasslands would mitigate the &amp;#8216;Birch effect&amp;#8217; resulting in less erratic transformations of soil mineral nitrogen and lower N&lt;sub&gt;2&lt;/sub&gt;O fluxes compared to monocultures. This study also predicted a lasting legacy effect of drought on soil systems resulting in prolonged heightened N&lt;sub&gt;2&lt;/sub&gt;O fluxes. Drought resulted in a depletion of soil NO&lt;sub&gt;3-&lt;/sub&gt;, increased &amp;#160;levels of NH&lt;sub&gt;4&lt;/sub&gt;&lt;sup&gt;+ &lt;/sup&gt;and background level N&lt;sub&gt;2&lt;/sub&gt;O emissions. Following re-wetting soil mineral N underwent transformations from NH&lt;sub&gt;4&lt;/sub&gt;&lt;sup&gt;+&lt;/sup&gt; to NO3- indicating nitrification. Four times more N&lt;sub&gt;2&lt;/sub&gt;O emissions were recorded during re-wetting period compared to fertilizer application. There was no lasting legacy effect of drought and re-wetting on N&lt;sub&gt;2&lt;/sub&gt;O fluxes observed during fertilizer application two weeks after re-wetting bar T. repens which has implications for grassland management strategies.&lt;/p&gt;

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