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Titolo:
Crop residues can affect N leaching over at least two winters
Autore:
Mitchell, R; Webb, J; Harrison, R;
Indirizzi:
ADAS Wolverhampton, Wolverhampton WV6 8TQ, W Midlands, England ADAS Wolverhampton Wolverhampton W Midlands England WV6 8TQ ands, England ADAS Boxworth, Cambridge CB3 8NN, England ADAS Boxworth Cambridge England CB3 8NN orth, Cambridge CB3 8NN, England
Titolo Testata:
EUROPEAN JOURNAL OF AGRONOMY
fascicolo: 1, volume: 15, anno: 2001,
pagine: 17 - 29
SICI:
1161-0301(200109)15:1<17:CRCANL>2.0.ZU;2-L
Fonte:
ISI
Lingua:
ENG
Soggetto:
SOIL ORGANIC-MATTER; DENSITY FRACTIONS; MICROBIAL BIOMASS; NITROGEN MINERALIZATION; FERTILIZER; WHEAT; DECOMPOSITION; CEREALS; STRAW; TERM;
Keywords:
crop residues; mineral N; nitrate leaching; medium term;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
36
Recensione:
Indirizzi per estratti:
Citazione:
R. Mitchell et al., "Crop residues can affect N leaching over at least two winters", EUR J AGRON, 15(1), 2001, pp. 17-29

Abstract

Overwinter nitrate leaching and periodic measurements of soil mineral N (SMN) to 90 cm. depth, were taken for 20 months after components of various arable crop residues had been ploughed into a free-draining sandy loam textured soil in central UK. Treatments were arranged to incorporate either, below ground residues; above ground residues with their own below ground residues; or, the above ground residues separately with the below ground residueof a preceding under-fertilised barley crop. The combination of these treatments allowed separate quantification of the SMN and N leached from the above and below ground residues. The residues were incorporated (12/9/1995) and a crop of barley fertilised with 90 kg ha(-1) N sown (14/9/1995). Immediately after the residues incorporation SMN was greatest where cabbage, potato and over-fertilised wheat had been grown. It was least following under-fertilised wheat and sugar beet. The N leached in the following winter (1995/1996) was strongly related to this preceding SMN (6/11/1995). There was considerable variation in N leached in 1995/1996 after the incorporation of below ground residues (18-145 kg ha(-1) N). The greatest losses were after incorporating the over-fertilised wheat, potatoes and cabbage (58-145 kg ha(-1) N), the smallest after sugar beet (18 kg ha(-1) N). The net effect of above ground residues on N leached in 1995/1996 also varied, but their additional effect was far less (- 19 to 15 kg ha(-1) N). The abover-ground residues of sugar beet and cabbage increased N leaching by 5-15 kg ha(-1) in 1995/1996, while the above-ground residues of cereals tended to reduce leaching ( - 19 to 2 kg ha(-1)). By the harvest of the subsequent under-fertilisedbarley crop (30/7/1996), and all subsequent sampling dates, there was no effect of previous crop residue treatments on SMN. N leached in 1996/1997, however, varied significantly. Leaching was again greatest from the below-ground residues of potato (69-83 kg ha(-1) N) and cabbage (112-115 kg ha(-1) N). Leaching from these residues of sugar beet remained small (15-24 kg ha(-1)) in 1996/1997. N leached in this second winter from the below-ground, with and without above-ground residues, was therefore, very strongly relatedto N leached the previous winter (r(2) = 0.93). Relative to the below ground residues, the above ground residue again had far less effect on N leached in 1996/1997. The above ground residue of sugar beet again increased N leaching by the greatest margin (9-10 kg ha(-1) in 1996-1997), cereals again tended to reduce N leaching (- 16 to 4 kg ha(-1)). N leached in this secondwinter from the above ground residues was, therefore, very strongly related to N leached the previous winter in 1995/1996 (r(2) = 0.69). (C) 2001 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 05/12/20 alle ore 01:26:31