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Titolo:
A thermal time analysis of ageing of maize (Zea mays L.) seed can account for reduced germination in hot moist soil
Autore:
Arachchi, DHM; Naylor, REL; Bingham, IJ;
Indirizzi:
Univ Aberdeen, Dept Agr, Aberdeen AB24 5UA, Scotland Univ Aberdeen Aberdeen Scotland AB24 5UA gr, Aberdeen AB24 5UA, Scotland SAC, Craibstone, Aberdeen, Scotland SAC Craibstone Aberdeen ScotlandSAC, Craibstone, Aberdeen, Scotland
Titolo Testata:
FIELD CROPS RESEARCH
fascicolo: 2, volume: 63, anno: 1999,
pagine: 159 - 167
SICI:
0378-4290(199909)63:2<159:ATTAOA>2.0.ZU;2-5
Fonte:
ISI
Lingua:
ENG
Soggetto:
ALPHA-AMYLASE ACTIVITY; DRYING METHOD; VIGOR; MATURITY; HARVEST; EMBRYO; WHEAT;
Keywords:
ageing; deterioration; maize; thermal time; soil temperature; soil moisture content;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
21
Recensione:
Indirizzi per estratti:
Indirizzo: Naylor, REL Univ Aberdeen, Dept Agr, MacRobert Bldg, Aberdeen AB24 5UA, Scotland Univ Aberdeen MacRobert Bldg Aberdeen Scotland AB24 5UA tland
Citazione:
D.H.M. Arachchi et al., "A thermal time analysis of ageing of maize (Zea mays L.) seed can account for reduced germination in hot moist soil", FIELD CR RE, 63(2), 1999, pp. 159-167

Abstract

After sowing into moist soil, maize seed imbibe although the soil moisturecontent may be too low to permit seedling emergence. The hypothesis testedhere is that in such circumstances, and especially at high temperature, the seed age in the soil with the result that when the moisture restriction is subsequently removed, germination and seedling emergence are reduced. First, maize seed were artificially deteriorated in the laboratory at fourelevated moisture and five constant temperature regimes for four differentperiods in order to determine the effect of ageing on radicle and coleoptile emergence. Next, the responses when seed were deteriorated at alternating temperatures were shown to be the same when the temperature exposure was expressed as thermal time. A base temperature for thermal ageing time was estimated as about 30 degrees C, Finally, when four Sri Lankan maize cultivars were sown in soil, the seed imbibed and experienced temperatures above 30 degrees C with the result that final seedling emergence was reduced. The effect of ageing in the soil appeared greater than that in the laboratory because the moisture content of seed in the soil was not constant but increasing. (C) 1999 Published by Elsevier Science B.V. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 30/11/20 alle ore 16:58:37