Title: Nitrogen and phosphorus benefits from faba bean (Vicia faba L.) residues to subsequent wheat crop in the humid highlands of Ethiopia
Authors: Nebiyu, Amsalu ×
Vandorpe, Adeline
Diels, Jan
Boeckx, Pascal #
Issue Date: 2014
Publisher: Kluwer
Series Title: Nutrient Cycling in Agroecosystems vol:98 pages:253-266
Abstract: Faba bean–wheat rotation is one of the
traditional cropping systems in most parts of the
temperate, Mediterranean and tropical highland areas.
However, the net contribution of legumes to soil nutrient
balance is determined by the extent to which crop
residue is removed from the field. Therefore, we
assessed two possible faba bean residue management
scenarios and their role in the faba bean–wheat rotation
system in a two-phase field experiment. We further
tested to what extent high N2-fixing and P efficient faba
bean varieties could benefit subsequently grown wheat.
In the first phase, three improved faba bean varieties
(Degaga, Moti, Obse) were grown at four levels of P
fertilization (0, 10, 20 and 30 kg P ha-1) along with
local faba bean and reference wheat but without any
fertilization. N2-fixation, soil N balance and P uptake
were determined for the faba beans. The N balance
was determined via two possible residue management scenarios: scenario-I assumed that all the aboveground
biomass is exported fromthe fields; scenario-II assumed
that all the above ground biomass except grains and
empty pods is incorporated to the soil. In the second
phase, the N and P benefits of faba beans to rotational
wheat were assessed. Scenario-I gave a negative net N
balance (kg N ha-1) in the range of -86.5 ± 5.8
(Degaga) to -9.4 ± 8.7 (Moti) with significant differences
between varieties. Scenario-II showed that all
balances were significantly (P\0.01) improved and
the varieties were positively contributing N to the
system in the range of 50.6 ± 13.4 (Degaga) to
168.3 ± 13.7 (Moti) kg N ha-1, which is equivalent
to 110–365 kg N ha-1 in the formof urea (46 %N). In
the second crop phase, biomass and grain yield ofwheat
grown after the faba beans improved significantly
(P\0.05) by 112 and 82 %, respectively compared
to the yield ofwheat afterwheat. Phosphorus application
to the preceding faba bean varieties significantly
improved total biomass and grain yield of the succeeding
wheat (R2 = 0.97). The incorporated legume root,
nodule and straw clearly played a role in improving
wheat yield through N addition via BNF and straw P.
The study demonstrates the prospects and importance of
improved faba bean germplasm and management as a
key component for sustainable wheat based cropping
systems in the humid tropical highlands.
ISSN: 1385-1314
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Division Soil and Water Management
× corresponding author
# (joint) last author

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