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Titolo:
Are differences in root growth of nitrogen catch crops important for theirability to reduce soil nitrate-N content, and how can this be measured?
Autore:
Thorup-Kristensen, K;
Indirizzi:
Danish Inst Agr Sci, Dept Fruit Vegetable & Food Sci, DK-5792 Aarslev, Denmark Danish Inst Agr Sci Aarslev Denmark DK-5792 ci, DK-5792 Aarslev, Denmark
Titolo Testata:
PLANT AND SOIL
fascicolo: 2, volume: 230, anno: 2001,
pagine: 185 - 195
SICI:
0032-079X(200103)230:2<185:ADIRGO>2.0.ZU;2-8
Fonte:
ISI
Lingua:
ENG
Soggetto:
SUCCEEDING CROPS; WINTER-WHEAT; FIELD; DYNAMICS; OILSEED; CEREALS; PLANTS; LENGTH; SYSTEM; WATER;
Keywords:
cover crop; nitrate leaching; root growth rates; rooting depth; soil nitrate depletion;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
31
Recensione:
Indirizzi per estratti:
Indirizzo: Thorup-Kristensen, K Danish Inst Agr Sci, Dept Fruit Vegetable & Food Sci,Kirstinebjergvej 10,DK-5792 Aarslev, Denmark Danish Inst Agr Sci Kirstinebjergvej 10 Aarslev Denmark DK-5792
Citazione:
K. Thorup-Kristensen, "Are differences in root growth of nitrogen catch crops important for theirability to reduce soil nitrate-N content, and how can this be measured?", PLANT SOIL, 230(2), 2001, pp. 185-195

Abstract

An experiment was made to measure root growth of nitrogen catch crops, to investigate whether differences in root growth among plant species are related to their ability to deplete the soil nitrate-N pool. Large differences were observed in root growth parameters. Monocot species had rooting depth penetration rates in the range of 1.0 to 1.2 mm d(-1) degreesC(-1), whereasthe non-legume dicot species had rates between 1.5 and 2.3 mm d(-1) degreesC(-1). Substantial differences were also found in the lag time from sowinguntil significant root growth was observed. The estimated temperature sum needed for the crops to reach a rooting depth of 1.0 m varied from 750 d degreesC for fodder radish to 1375 d degreesC for Italian ryegrass. The depthdistribution of the root system varied strongly, and at a depth of 1.0 m the non-legume dicot species generally had root intensities (number of root intersections m(-1) line on the minirhizotrons) 12 times as high as the monocot species. The amount of nitrate left in the topsoil (0-0.5 m) was only weakly correlated to a few of the measured plant and root parameters, whereas nitrate left in the subsoil (0.5-1.0 m) was clearly correlated to several root parameters. Subsoil nitrate residues were well correlated to root intensity, but showed even stronger correlations to more simple estimates of rooting depth. In the deepest soil layer measured (1.0-1.5 m), the soil water nitrate concentration was reduced from 119 mug L-1 without a catch crop to 61 mug L-1under Italian ryegrass and to only 1.5 mug L-1 under fodder radish. The results show that to identify the important differences in root growthamong catch crops, root growth must be measured in deep soil layers. In this study, none of the measurements made aboveground or in the upper soil layers were well related to subsoil nitrate depletion.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 30/11/20 alle ore 16:51:47