TY  - JOUR
T1  - Otnitrogen Immobilization and Remineralization in Four Cultivated Soils from Eastern France
AU - , H. Cheloufi AU - , P.C. Vong AU - , F. Jacquin AU - , F. Adreux 
JO  - Research Journal of Agronomy
VL  - 1
IS  - 3
SP  - 116
EP  - 122
PY  - 2007
DA  - 2001/08/19
SN  - 1815-9354
DO  - rjagr.2007.116.122
UR  - https://makhillpublications.co/view-article.php?doi=rjagr.2007.116.122
KW  - Nitrogen
KW  -immobilization
KW  -remineralization
KW  -cultivated soils
KW  -Eastern France
AB  - Nitrogen immobilization and remineralization from a fertilizer supplied as <SUP>15</SUP>N ammonium sulfate were determined by hydrolytic fractionation of organic nitrogen with HCl 6N into: Acid-Soluble Distillable Nitrogen (NSAD), acid-soluble Non-Distillable nitrogen (NSAnD) and non-hydrolysable nitrogen (Nnh). The study was carried out  on  Ap  horizon  of  four  representative  agricultural  soils  from  Eastern  France:  A  rendzina (<I>Typic Rendoll</I>), a pelsol (<I>Vertic Eutrochrept</I>) and brown leached soil (<I>Typic Hapludalf</I>). After one month of incubation under controlled conditions, the immobilization of the fertilizer was higher in the rendzina (24.5%) and pelsol (24.1%) or acid brown soil (16.9%). Conversely, the comparison of immobilized <SUP>15</SUP>Namounts befor and after cultivation, indicated that remineralization in the brown soils (acid brown soil 59.2%, brown leached soil 51.2%) was approximately twice higher as in the rendzina (21.1%) and pelsol (28.7%). These results show that with an Italian rye-grass used as test plant the remineralization was higher in the brown soils than in the tow clayed soils. Although the three NSAD, NSAnD and Nnh fractions participate in both, immobilization and remineralization process, the NSAnD compartment was shown to be the most active. The fact in presence of plants, part of the non-hydrolysable nitrogen fraction was biodegradable, is of particular interest.
ER  -