TITLE

Decomposition of lupine seeds and seedlings as N fertilizer in organic vegetable production

AUTHOR(S)
Katroschan, Kai-Uwe; Teixeira, Gonçalo; Kahlen, Katrin; Stützel, Hartmut
PUB. DATE
August 2012
SOURCE
Plant & Soil;Aug2012, Vol. 357 Issue 1/2, p59
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Background and aims: Nitrogen mineralization of lupine seeds and seedlings to be used as flexible leguminous N source in organic vegetable production was investigated. It was hypothesized that changes in seed chemical composition during germination are associated with increased fertilizer efficiency of seed N. Methods: Net N mineralization of seed meal and seedlings varying in age was determined in pot and field experiments. The temporal mineralization pattern was quantified by fitting first-order kinetics. Results: In the pot experiment, seedling C:N ratio declined within 2 weeks from initially 8.8 to a minimum of 6.2 prior to a re-increase. Maximum net N mineralization increased strongly with decreasing C:N ratio being up to 44% higher for seedlings compared to seed meal. Time course of net N mineralization in the field showed initial peaks partly exceeding the amount of applied lupine seed N. Ignoring mineralization peaks, the relationship between maximum net N mineralization and C:N ratio was in close agreement with pot experimental data. The critical C:N ratio of the pooled data was 13. Conclusions: Nitrogen mineralization of field-sown lupine seeds can be manipulated by varying seedling growing time until incorporation. High fertilizer efficiency provided by high net N mineralization is associated with early seedling incorporation and high germination rates.
ACCESSION #
77735632

 

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