Distribution of fertiliser N among fixed ammonium fractions as affected by moisture and fertiliser source and rate期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

Distribution of fertiliser N among fixed ammonium fractions as affected by moisture and fertiliser source and rate

Authors:	Gregory A. Gouveia Gaius D. Eudoxie

Affiliation:	(1) Department of Food Production, Faculty of Sciences and Agriculture, University of the West Indies, St. Augustine Campus, St. Augustine, Trinidad and Tobago

Abstract:	The relevance of fixed ${text{NH}}^{{text{ + }}}_{{text{4}}}$ in certain soils and its categorisation has made it necessary to re-examine N behaviour. A replicate factorial experiment was designed to investigate the influence of soil type, soil moisture and fertiliser source and rate on ${text{NH}}^{{text{ + }}}_{{text{4}}}$ fixation dynamics with particular attention to the distribution between weakly and strongly fixed pools. Fixation of ${text{NH}}^{{text{ + }}}_{{text{4}}}$ was <20% of added N for all soils except River Estate. The percentage of added N present as fixed ${text{NH}}^{{text{ + }}}_{{text{4}}}$ was greater for the low application rate. Soil moisture did not significantly influence weakly fixed ${text{NH}}^{{text{ + }}}_{{text{4}}}$ . However, the dry soil treatment showed greater fertiliser ¹⁵N present as strongly fixed ${text{NH}}^{{text{ + }}}_{{text{4}}}$ . Fertiliser ¹⁵N present as weakly and strongly fixed ${text{NH}}^{{text{ + }}}_{{text{4}}}$ decreased and increased, respectively, at the second sampling, indicating movement between the pools. The importance of the weakly fixed ${text{NH}}^{{text{ + }}}_{{text{4}}}$ fraction as a transitory pool between strongly fixed ${text{NH}}^{{text{ + }}}_{{text{4}}}$ and available ${text{NH}}^{{text{ + }}}_{{text{4}}}$ was observed.

Keywords:	¹⁵N Recovery Fixed IEq11" > /content/b657k415k6842uj6/374_2007_171_Article_IEq11.gif" alt=" $$ {text{NH}}^{{text{ + }}}_{{text{4}}} $$" align=" middle" border=" 0" > Weakly fixed IEq12" > /content/b657k415k6842uj6/374_2007_171_Article_IEq12.gif" alt=" $$ {text{NH}}^{{text{ + }}}_{{text{4}}} $$" align=" middle" border=" 0" > Strongly fixed IEq13" > /content/b657k415k6842uj6/374_2007_171_Article_IEq13.gif" alt=" $$ {text{NH}}^{{text{ + }}}_{{text{4}}} $$" align=" middle" border=" 0" >
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