Factor for estimating nitrogen contribution of cowpea as a cover crop

Authors
Aguiar, JL Williams, WA Graves, WL McGiffen, M Samons, JV Ehlers, JD Matthews, WC
Citation
Jl. Aguiar et al., Factor for estimating nitrogen contribution of cowpea as a cover crop, J AGRON CR, 186(3), 2001, pp. 145-149
Citations number
11
Categorie Soggetti
Agriculture/Agronomy
Journal title
JOURNAL OF AGRONOMY AND CROP SCIENCE-ZEITSCHRIFT FUR ACKER UND PFLANZENBAU
ISSN journal
09312250 → ACNP
Volume
186
Issue
3
Year of publication
2001
Pages
145 - 149
Database
ISI
SICI code
0931-2250(200105)186:3<145:FFENCO>2.0.ZU;2-3
Abstract
The nitrogen contribution of cowpea [Vigna unguiculata (L.) Walp.] above-gr ound biomass was estimated using the per cent nitrogen and per cent dry mat ter of 24 cowpea entries. Cowpea growth stage was assigned a maturity index , and an 'N factor' was calculated. Results for this species-specific 'N fa ctor' ranged from 12.5 at the vegetative stage to 13.5 at the reproductive stage. Using the 'rule of 16' as developed for sampling the fresh biomass o f other legume cover crops, the amount of nitrogen contributed by cowpeas c an be estimated by using an average 'N factor' of 13.