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Titolo:
Evaluation of the current Belgian N fertilisation advice system for butterhead lettuce grown under glass
Autore:
Salomez, J; Hofman, G; Van Meriervenne, M; Bleyaert, P; Calus, A; Van Cleemput, O;
Indirizzi:
Fac Agr & Appl Biol Sci, Dept Soil Management & Soil Care, B-9000 Ghent, Belgium Fac Agr & Appl Biol Sci Ghent Belgium B-9000 Care, B-9000 Ghent, Belgium
Titolo Testata:
PROCEEDINGS OF THE INTERNATIONAL WORKSHOP ON ECOLOGICAL ASPECTS OF VEGETABLE FERTILISATION IN INTEGRATED CROP PRODUCTION IN THE FIELD
fascicolo: 506, , anno: 1999,
pagine: 93 - 98
SICI:
0567-7572(1999):506<93:EOTCBN>2.0.ZU;2-Q
Fonte:
ISI
Lingua:
ENG
Soggetto:
AMMONIUM; NITROGEN; NITRATE; NITRITE; SOILS;
Keywords:
Lactuca sativa L-var. capitata L.; mineral N balance method; greenhouses; environmental friendly production;
Tipo documento:
Article
Natura:
Collana
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
15
Recensione:
Indirizzi per estratti:
Indirizzo: Salomez, J Fac Agr & Appl Biol Sci, Dept Soil Management & Soil Care, Coupure 653, B-9000 Ghent, Belgium Fac Agr & Appl Biol Sci Coupure 653 Ghent Belgium B-9000 lgium
Citazione:
J. Salomez et al., "Evaluation of the current Belgian N fertilisation advice system for butterhead lettuce grown under glass", ACTA HORT, (506), 1999, pp. 93-98

Abstract

N fertilization advice systems for lettuce are designed to meet EU regulations to control nitrate concentrations in edible plant parts. This study evaluates current fertiliser practice on the uptake and loss of N for butterhead lettuce. Field trials were carried out in 8 greenhouses in the provinceof West-Flanders, Belgium. Results show that under normal lettuce growth, N uptake varied between 90 and 120 kg N ha(-1) and the NO3--limit was neverexceeded. Although product-quality was assured, discrepancies between decrease of N-min expected residual soil N-min at harvest and measured residualsoil N-min were observed. As N uptake mainly occurs from the 0-30 cm layer(rooting depth), a residual N-min of 60-80 kg N ha(-1) (0-30 cm) and low N-min values in the 30-120 cm layer were expected. However, during winter there was no decrease in the soil mineral N and N-min values (0-30 cm) up to 300 kg N ha(-1) were measured. During spring and early summer, the decreasein the upper soil layer greatly exceeded maximum N uptakes, sometimes leaving less than 60 kg N ha(-1) in the upper layer, possibly because of gaseous N2O and N-2 losses. In addition, high N-min values (30-120 cm), of up to 900 kg N ha(-1), were measured. To avoid on the one hand high residual soil N-min at harvest and possible high leaching losses and on the other N deficiency and possible gaseous losses, measures were evaluated to minimise the difference between the available nitrogen in the soil profile and the N need of the crop. An alternative mineral N balance method is proposed, where in addition to uptake and residual N-min, N mineralisation and N losses will be considered. This method should result in an improved use of N fertilisers with minimal impact on the environment.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 27/11/20 alle ore 13:56:31