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Titolo:
THE INFLUENCE OF CYST NEMATODES AND DROUGHT ON POTATO GROWTH .5. EFFECTS ON ROOT DISTRIBUTION AND NITROGEN DEPLETION IN THE SOIL-PROFILE
Autore:
HAVERKORT AJ; GROENWOLD J; VANDEWAART M;
Indirizzi:
DLO,AGROBIOL & SOIL FERTIL RES INST,AB,POB 14 6700 AA WAGENINGEN NETHERLANDS
Titolo Testata:
European journal of plant pathology
fascicolo: 6, volume: 100, anno: 1994,
pagine: 381 - 394
SICI:
0929-1873(1994)100:6<381:TIOCNA>2.0.ZU;2-O
Fonte:
ISI
Lingua:
ENG
Soggetto:
SEMI-CONTROLLED CONDITIONS; TOLERANCE; CROPS;
Keywords:
GLOBODERA PALLIDA; SOLANUM TUBERSOSUM L; MINIRHIZOTRON; NITROGEN DEPLETION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
14
Recensione:
Indirizzi per estratti:
Citazione:
A.J. Haverkort et al., "THE INFLUENCE OF CYST NEMATODES AND DROUGHT ON POTATO GROWTH .5. EFFECTS ON ROOT DISTRIBUTION AND NITROGEN DEPLETION IN THE SOIL-PROFILE", European journal of plant pathology, 100(6), 1994, pp. 381-394

Abstract

In two experiments in the Wageningen Rhizolab with potato cv. Mentor planted in soils with or without potato cyst nematodes (Globodera pallida, W) the number of roots per cm(2) was observed two weekly by videocamera, in horizontally placed minirhizotrons at depths varying from 5 to 100 cm. In both experiments initial root growth was more rapid inthe top soil of the uninfected soil. In the first experiment under optimal water supply, root formation continued longer in the top 30 cm of infested soil leading to twice as many roots at the end of the growing season as in uninfested soil. In the subsoil from 30 to 100 cm, however, root formation was strongly reduced by cyst nematodes leading toan uneven distribution of roots throughout the profile. In the secondexperiment potato cyst nematodes only increased rooting in the top soil with reduced irrigation. Potato cyst nematodes did not affect the water use efficiency of the crop whereas reduced irrigation increased water use efficiency by about 22%. Without potato cyst nematodes the soil profile was depleted of mineral nitrogen until a depth of 1 m whereas with high initial population densities no nitrogen was taken up in the subsoil between 30 and 100 cm. The spational heterogenity of rootsand nitrogen in the soil is an important mechanism of damage. This finding may lead to improved cultural practices and breeding for tolerance.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 02/12/20 alle ore 15:13:49