IMPORTANCE OF ORGANIC NITROGEN FRACTIONS IN SANDY SOILS, OBTAINED BY ELECTROULTRAFILTRATION OR CACL2 EXTRACTION, FOR NITROGEN MINERALIZATION AND NITROGEN UPTAKE OF RAPE - Research portal of Justus Liebig University Giessen:

Journal article

IMPORTANCE OF ORGANIC NITROGEN FRACTIONS IN SANDY SOILS, OBTAINED BY ELECTROULTRAFILTRATION OR CACL2 EXTRACTION, FOR NITROGEN MINERALIZATION AND NITROGEN UPTAKE OF RAPE

Authors list: APPEL, T; MENGEL, K

Publication year: 1990

Pages: 97-101

Journal: Biology and Fertility of Soils

Volume number: 10

Issue number: 2

ISSN: 0178-2762

eISSN: 1432-0789

Publisher: Springer

Abstract:
Sandy soils have low reserves of mineral N in spring. Therefore organic-bound N is the most important pool available for crops. The objective of the present investigation was to study the importance of the organic-bound N extracted by electro-ultrafiltration and by a CaCl2 solution for the supply of N to rape and for N mineralization. Mitscherlich-pot experiments carried out with 12 different sandy soils (Germany) showed a highly significant correlation between the organic N extracted (two fractions) and the N uptake by the rape (electro ultrafiltration extract: r = 0.76***; CaCl2 extract: r = 0.76***). Organic N extracted by both methods before the application of N fertilizer was also significantly correlated with N mineralization (electro-ultrafiltration extract: r = 0.75***; CaCl2 extract: r = 0.79***). N uptake by the rape and the mineralization of organic N increased with soil pH and decreased with an increasing C:N ratio and an increasing proportion of sand in the soils. Ninety-eight percent of the variation in N uptake by the rape was determined by the differences in net mineralization of organic N. This shows that in sandy soils with low mineral N reserves (NO3--N, NH4+-N) the organic soil N extracted by electro-ultrafiltration or CaCl2 solution indicates the variance in plant-available N. Total soil N was not related to the N uptake by plants nor to N mineralization.

Citation Styles

Harvard Citation style: APPEL, T. and MENGEL, K. (1990) IMPORTANCE OF ORGANIC NITROGEN FRACTIONS IN SANDY SOILS, OBTAINED BY ELECTROULTRAFILTRATION OR CACL2 EXTRACTION, FOR NITROGEN MINERALIZATION AND NITROGEN UPTAKE OF RAPE, Biology and Fertility of Soils, 10(2), pp. 97-101

APA Citation style: APPEL, T., & MENGEL, K. (1990). IMPORTANCE OF ORGANIC NITROGEN FRACTIONS IN SANDY SOILS, OBTAINED BY ELECTROULTRAFILTRATION OR CACL2 EXTRACTION, FOR NITROGEN MINERALIZATION AND NITROGEN UPTAKE OF RAPE. Biology and Fertility of Soils. 10(2), 97-101.

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