Cycling of Grain Legume Residue Nitrogen
作者:
E.S. Jensen,
期刊:
Biological Agriculture & Horticulture
(Taylor Available online 1995)
卷期:
Volume 11,
issue 1-4
页码: 193-202
ISSN:0144-8765
年代: 1995
DOI:10.1080/01448765.1995.9754705
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
Symbiotic nitrogen fixation by legumes is the main input of nitrogen in ecological agriculture. The cycling of15N-labelled mature pea (Pisum sativumL.) residues was studied during three years in small field plots and lysimeters. The residual organic labelled N declined rapidly during the initial weeks of decomposition, due to high rates of residue N net mineralization and subsequent leaching and denitrification losses of N. Lysimeter experiments showed that pea residues may reduce leaching losses of N, probably due to their effect on the mineralization-immobilization turnover of N and denitrification. Winter barley succeeding field pea recovered 13% of the incorporated pea residue N by early December; the recovery was found to be 15% at maturity in July. A spring-sown crop of barley recovered less than half the amount of pea residue N recovered by winter barley. The residue N-use efficiencies were 36% and 15% in three sequences of cropping systems with autumn- or spring-established crops, respectively. The results highlight the requirement for establishment of crops after cultivation of pea which are efficient in taking up N in the autumn/early spring and the need for improved residue management methods in order to conserve grain legume residue N sources within the soil-plant system.
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