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Titolo:
PRIMING EFFECTS OF N-15-LABELED AMMONIUM-NITRATE ON UPTAKE OF SOIL N BY WHEAT (TRITICUM-AESTIVUM L) UNDER FIELD CONDITIONS
Autore:
HAMID A; AHMAD M;
Indirizzi:
NUCL INST AGR & BIOL,DIV SOIL SCI,POB 128 FAISALABAD PAKISTAN
Titolo Testata:
Biology and fertility of soils
fascicolo: 4, volume: 15, anno: 1993,
pagine: 297 - 300
SICI:
0178-2762(1993)15:4<297:PEONAO>2.0.ZU;2-W
Fonte:
ISI
Lingua:
ENG
Soggetto:
FERTILIZER NITROGEN; WINTER-WHEAT; FATE;
Keywords:
N-15-LABELED FERTILIZER; PRIMING EFFECT; FERTILIZER N-UPTAKE; SOIL N-UPTAKE; WHEAT;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
12
Recensione:
Indirizzi per estratti:
Citazione:
A. Hamid e M. Ahmad, "PRIMING EFFECTS OF N-15-LABELED AMMONIUM-NITRATE ON UPTAKE OF SOIL N BY WHEAT (TRITICUM-AESTIVUM L) UNDER FIELD CONDITIONS", Biology and fertility of soils, 15(4), 1993, pp. 297-300

Abstract

The uptake of labelled and unlabelled N by wheat was measured in a field experiment using N-15-labelled ammonium nitrate fertilizer. The dry matter yield and N yields were significantly increased with fertilizer N application compared to those from unfertilized soil. The uptake of applied N by wheat ranged between 25 and 34%. Fertilizer N application increased the uptake of unlabelled soil N which was attributed to a positive ''priming effect'' or added N interaction. The added N interaction observed by applying 20, 60, and 120 kg fertilizer N was 11.4,19. 1, and 27.9 kg, corresponding to 26, 44 and 64%, respectively of the N taken up from unfertilized soil. The A values did not alter withthe increase in fertilizer N application. The observed added N interaction may have been the result of pool substitution whereby added labelled fertilizer N stood ''proxy'' for unlabelled soil N. A significantcorrelation coefficient (r = 0.996*) between the uptake of soil N and the dry matter yield showed that soil N was more important than fertilizer N in wheat production.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 24/09/20 alle ore 20:43:24