ammonium fixation
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Geoderma ◽  
2021 ◽  
Vol 400 ◽  
pp. 115151
Author(s):  
Heleen Deroo ◽  
Masuda Akter ◽  
Orly Mendoza ◽  
Pascal Boeckx ◽  
Steven Sleutel






2014 ◽  
Vol 60 (No. 7) ◽  
pp. 325-331 ◽  
Author(s):  
Scherer HW ◽  
E. Feils ◽  
P. Beuters

It is postulated that stabilized ammonium fertilizers improve fertilizer-N utilization by crops, leading thus to higher yields with the same fertilizer rate, especially on sandy soils. However, it must be taken into consideration that in clayey soil at least a part of the NH<sub>4</sub><sup>+</sup> ions may be fixed by 2:1 clay minerals, thus delaying the effect of the N fertilizer. Because NH<sub>4</sub><sup>+</sup> and K<sup>+</sup> have similar size and valence properties and therefore compete for the same non-exchangeable sites of 2:1 clay minerals, we investigated the influence of time and K<sup>+</sup> application rate on both fixation and release of NH<sub>4</sub><sup>+</sup>. Fixation of NH<sub>4</sub><sup>+</sup> ions was higher when K<sup>+</sup> was applied after NH<sub>4</sub><sup>+</sup>, while the influence of the K<sup>+</sup> application rate was less pronounced. Mobilization of non-exchangeable NH<sub>4</sub><sup>+</sup> was retarded when K<sup>+</sup> was applied at the high rate after NH<sub>4</sub><sup>+</sup>. At the first harvest yield formation of ryegrass was neither influenced by the amount as well as the application time of K<sup>+</sup>, because plant available N was not growth limiting, while yield of the second harvest was significantly higher with the low K<sup>+</sup> application rate after NH<sub>4</sub><sup>+</sup>. After the second harvest the blocking effect of K<sup>+</sup> on the release of non-exchangeable NH<sub>4</sub><sup>+</sup> was attenuated and the highest yields of the third cut were reached in the treatments with the high K<sup>+</sup> application rate after NH<sub>4</sub><sup>+</sup>. Total dry matter yield was highest when K<sup>+</sup> was applied at the low rate after NH<sub>4</sub><sup>+</sup>. Our results show that K<sup>+</sup> governs fixation and release of non-exchangeable NH<sub>4</sub><sup>+</sup>, which should be taken into consideration when applying ammonium containing N fertilizers like ammonium sulfate, ammonium sulfate nitrate and ENTEC. Thus K<sup>+</sup> can affect N availability when N is applied as NH<sub>4</sub><sup>+</sup> in both the short and long term.



2011 ◽  
Vol 42 (13) ◽  
pp. 1606-1618 ◽  
Author(s):  
Müzeyyen Seçer ◽  
Ömer Lütfü Elmaci ◽  
Oya Erdemir


2007 ◽  
Vol 6 (4) ◽  
pp. 466-474 ◽  
Author(s):  
Yang-zhu ZHANG ◽  
Shun-hong HUANG ◽  
Da-juan WAN ◽  
Yun-xiang HUANG ◽  
Wei-jun ZHOU ◽  
...  


2006 ◽  
Vol 289 (1-2) ◽  
pp. 289-300 ◽  
Author(s):  
Daniel Rider ◽  
Donald McGahan ◽  
Vic Claassen
Keyword(s):  


2005 ◽  
Vol 277 (1-2) ◽  
pp. 73-84 ◽  
Author(s):  
D. Rider ◽  
R. J. Zasoski ◽  
V. P. Claassen


2002 ◽  
Vol 17 (3) ◽  
pp. 199-208 ◽  
Author(s):  
Ö.L Elmacı ◽  
M Seçer ◽  
O Erdemir ◽  
N Iqbal


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