Ammonium and ammonia fixation in some Oregon soils
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Ammonium and ammonia fixation in some Oregon soils

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Published .
Written in English


  • Ammonia.,
  • Soils -- Oregon.

Book details:

Edition Notes

Statementby Ray August Cattani.
The Physical Object
Pagination78 leaves, bound :
Number of Pages78
ID Numbers
Open LibraryOL14299513M

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Abstract. NH 4 +-fixation by inorganic and organic soil components and crop utilization of fertilizer nitrogen was studied in a number of Caribbean soils using 15 N fertilizers.. At moderate rates of nitrogen application, NH 4 +-fixation by clays during several-week laboratory incubations was rapid and highly variable, ranging from less than 10% to over 70% of the NH 4 + :// Fixed ammonium may account for as much as 50% of the total N in the top metre of some soils, and the fixation and release of ammonium plays a prominent role in the internal cycle of N in soils. H and Vahtras, K Retention and fixation of ammonium and ammonia in soil. In: Stevenson, F J (ed.), Nitrogen in Agricultural Soils. pp. The amounts of ammonium fixed by the soils where increasing amounts of ammonium applied were found between %. There was a significant effect from application of potassium to the soils on Revegetation on disturbed, low organic matter content, decomposed granite (DG) substrates are limited by low plant-available moisture and nitrogen. Data from a single DG site in northern California, USA, showed that a significant fraction of the ammonium from fertilizers or organic matter mineralization was fixed into silicate interlayer ://

Ammonium fixation properties of some arable soils. ammonia in soils. In: FJ Stevens (eds) Nitrogen in fixation by soils and pure minerals has focused on K fixation and release by the clay The capacity of an originally acid Norway spruce raw humus to fix isotopically labelled ammonium and amino nitrogen in a form resistant to cold 1N HCl treatment was studied. The amount fixed was determined after a reaction period of 24 hours (the humus pretreated with propylene oxide), using the amount of labelled N in the HCl-leached humus residue as a basis for calculating the amount of Ammonium N applied in the autumn is rapidly nitrified and nitrate intensifies take-all in non-suppressive soils. The use of timed ammonium fertilizer application is therefore a practical approach to suppress take-all, and variations in suppression between years and locations (Christensen et al., ; MacNish, ) are probably related to rate Ammonia availability varies by orders of magnitudes with a small pH change. Pure cultures of AOB typically do not grow below pH where the ammonium to ammonia ratio (NH 4 + /NH 3) is ∼ (Allison & Prosser, ), but ureolytic AOB such as Nitrosospira can grow at

  In contrast, in some soils regularly supplied with nitrogen fertilizers, AOB was thought to be mainly responsible for the ammonia oxidation (Jia and Conrad, ; Xia et al., ), and AOB growth was also observed to benefit from increased ammonium availability (Schauss   In soils, ammonia (NH3) is more rapidly converted to ammonium ions (NH4 +) when hydrogen ions are plentiful (acidic soils - pHsoils ammonium ions (NH4 +) are unstable and can change back to ammonia gas (NH3), which can be lost via volatilisation. Therefore on alkaline soils, it is critical to get the urea washed in as soon as Fixation of anhydrous NH3 by the mineral fraction of air‐dry samples from 65 horizons in 17 Pacific Northwest soils was investigated. Soils represented a wide variety of great soil groups. Nitrogen f   In fact, some of the highest gross nitrification rates are found in soils with pH Ammonia oxidation in acid soils may be explained by reductions in pH minima for growth and activity in laboratory cultures in which AOB grow in aggregates or on surfa Ureolytic growth of