Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
INTEGRATED ROOT-SYSTEM AGE IN RELATION TO PLANT NUTRIENT-UPTAKE ACTIVITY
Autore:
GAO SY; PAN WL; KOENIG RT;
Indirizzi:
WASHINGTON STATE UNIV,DEPT CROP & SOIL SCI PULLMAN WA 99164 WASHINGTON STATE UNIV,DEPT CROP & SOIL SCI PULLMAN WA 99164 SOIL SEARCH LABS KENNEWICK WA 99337 UTAH STATE UNIV,DEPT PLANTS SOILS & BIOMETEOROL LOGAN UT 84322
Titolo Testata:
Agronomy journal
fascicolo: 4, volume: 90, anno: 1998,
pagine: 505 - 510
SICI:
0002-1962(1998)90:4<505:IRAIRT>2.0.ZU;2-I
Fonte:
ISI
Lingua:
ENG
Soggetto:
NITRATE UPTAKE; PHOSPHORUS; GROWTH; POTASSIUM; GENOTYPES; MODEL; NITROGEN;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
27
Recensione:
Indirizzi per estratti:
Citazione:
S.Y. Gao et al., "INTEGRATED ROOT-SYSTEM AGE IN RELATION TO PLANT NUTRIENT-UPTAKE ACTIVITY", Agronomy journal, 90(4), 1998, pp. 505-510

Abstract

The age of a root segment is inversely related to its nutrient uptakeactivity (uptake rate per unit root length). It is uncertain how thisinformation should be incorporated into nutrient uptake models, due to our inability to characterize the age of a whole root system. A method of calculating an integrated root system age (IRSA) was defined, and two solution experiments were conducted to relate the N uptake activity of spring wheat (Triticum aestivum L.) to root age. Literature data also were analyzed to characterize the relationship between IRSA andnutrient uptake activity of whole plant root systems, Integrated rootsystem age was defined as the summation of the mean ages of root segments produced during each growth period weighted by the ratio of the root length generated during each growth period to total root length. The NH4 and NO3 uptake activity of spring wheat decreased with plant age as IRSA increased, while plants with similar IRSA at 14 and 21 d hadsimilar N uptake activity. These relationships between IRSA and the uptake activity of N, P, K, Ca, and Mg of corn (Zea mays L,) were also revealed from an analysis of published data. In young root systems, nutrient uptake activity declined rapidly as IRSA increased, while olderroot systems (IRSA >10 to 15 d) maintained a relatively low and gradually declining nutrient uptake activity with increasing IRSA, The IRSAis a useful parameter for characterizing nutrient uptake activity of an entire root system, providing a potential tool for modeling nutrient uptake.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 19/09/20 alle ore 09:17:59