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|Title: ||Grain legume rotation benefits to maize in the northern Guinea savanna of Nigeria: fixed-nitrogen versus other rotation effects|
|Authors: ||Yusuf, A. A.|
Iwuafor, E. N. O.
Abaidoo, R. C.
Olufajo, O. O.
|Keywords: ||N balance|
Northern Guinea savanna
|Issue Date: ||2009|
|Publisher: ||Nutr Cycl Agroecosyst|
|Citation: ||Nutr Cycl Agroecosyst (2009) 84:129–139|
|Abstract: ||The yield increases often recorded in
maize following grain legumes have been attributed
to fixed-N and ‘other rotation’ effects, but these
effects have rarely been separated. Field trials were
conducted between 2003 and 2005 to measure these
effects on maize following grain legumes in the
northern Guinea savanna of Nigeria. Maize was
grown on plots previously cultivated to two genotypes
each of soybean (TGx 1448-2E and SAMSOY-
2) and cowpea (IT 96D-724 and SAMPEA-7), maize,
and natural fallow. The plots were split into four N
fertilizer rates (0, 30, 60 and 90 kg N ha-1) in a split
plot design. The total effect was calculated as the
yield of maize following a legume minus the yield
following maize, both without added N and the
rotation effect was calculated as the difference
between rotations at the highest N fertilizer rate.
The legume genotypes fixed between 14 and
51 kg N ha-1 of their total N and had an estimated
net N balance ranging from -29.8 to 9.5 kg N ha-1.
Positive N balance was obtained only when the
nitrogen harvest index was greater than the proportion
of N derived from atmosphere. The results also
indicated that the magnitude of the fixed-N and other
rotation effects varied widely and were influenced by
the contributions of the grain legumes to the soil
N-balance. In general, fixed-N effects ranged from
124 to 279 kg ha-1 while rotation effects ranged
between 193 and 513 kg ha-1. On average, maize
following legumes had higher grain yield of 1.2 and
1.3-fold compared with maize after fallow or maize
after maize, respectively.|
|Description: ||An article published by Nutr Cycl Agroecosyst (2009) 84:129–139|
|Appears in Collections:||College of Science|
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