| Titre |
Symbiotic nitrogen fixation and nitrogen budget of Brazilian soybean [Glycine max (L.) Merril] varieties introduced in Benin using 15N isotopic dilution method |
| Auteurs |
ZOUNDJI CARMELLE CHARLOTTE [1],
HOUNGNANDAN PASCAL [2],
KOUELO ALLADASSI FÉLIX [3],
BOKO E. FRECHNO [4],
ADU GYAMFI J. JOSEPH [5],
|
| Journal: |
African journal of agricultural research |
| Catégorie Journal: |
Internationale |
| Impact factor: |
0.26 |
| Volume Journal: |
11 |
| DOI: |
10.5897/AJAR2015.9787 |
| Resume |
Nitrogen-15 isotopic dilution method was used to estimate biological nitrogen fixation (BNF) and
nitrogen (N) budget of fourteen (14) soybean varieties using maize as reference crop. The experiment
was carried out at Sekou in Southern Benin. The amount of N derived from air (Ndfa kg N ha-1) ranged
from 51 for variety BRS 261 to 148 for variety Canarana. In a scenario where the soybean shoot dry
matter and grains were removed from the field after harvest and only the fallen leaves were
incorporated into the soil, the N budget ranged between -91 (Canarana) and -17 kg N ha-1 (BRS 260).
When only soybean grain was exported from the fields and fallen leaves and shoot dry matter are
incorporated into the soil, the N budget varied from 7 (BRS 261) to 74 kg N ha-1 (BRS Garantia). The
study showed that Canarana, TGX 1448 2E and BRS Paraiso soybean varieties fixed the highest amount
of N among the 14 varieties. The inclusion of those soybean varieties in cereal-based cropping systems
would help reduce N inputs and improve soil and crop productivity in farming systems in Benin |
| Mots clés |
15N enrichment technique
N2 fixation
N balance
soil fertility
Benin |
| Pages |
7 - 15 |
| Fichier |
(PDF) |