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African Crop Science Journal
African Crop Science Society
ISSN: 1021-9730
EISSN: 1021-9730
Vol. 4, No. 3, 1996, pp. 359-364
Bioline Code: cs96076
Full paper language: English
Document type: Short Communication
Document available free of charge

African Crop Science Journal, Vol. 4, No. 3, 1996, pp. 359-364

 en Phosphorus, sulphur and molybdenum effects on response of Phaseolus beans to inoculation with Rhizobium in Malawi
Lupwayi, N.Z. & Mkandawire, A.B.C.


The effects of P, S and Mo on the response of field beans
(Phaseolus vulgaris L.) to inoculation with
Rhizobium leguminosarum bv. phaseoli were
investigated at four sites in Malawi.  Treatments consisted of
non-inoculation and inoculation; fertilisation at 0 and 17.5
kg P ha-1; 0 and 30 kg S ha-1; and 0 and 1 kg Mo ha-1. 
A nitrogen control at 100 kg N ha-1 was included.  To
identify the nutrients that limited response to inoculation
most, P, S and Mo were either applied or not applied to the
inoculated plants.  At all study sites, there was no
significant response (P<0.05) of nodule number to
inoculation.  Grain yield increased by 39% due to inoculation
at Champhira.  Improved soil fertility increased nodule number
by 387 to 426%  at three of the four sites.  Also, significant
increases (31% and 35%) in grain yield due to improved soil
fertility occurred at two sites.  At least one of the three
nutrients was identified as limiting nodulation at each site,
but grain yields were only affected by P deficiency at Sokola
and Mo deficiency at Champhira.  Therefore, alleviating
nutrient deficiencies and increasing nodule occupancies by
efficient inoculant strains are some of the ways in which the
response of beans to inoculation could be increased.

Field beans, nitrogen fixation, nodulation, soil fertility

Lupwayi, N.Z. & Mkandawire, A.B.C.


Les effets de la reaction des P, S et Mo dans les champs
d'haricot (Phaseolus Vulgaris L.) en inoculation avec le
Rhizobium Leguminosarum par phaseoli etaient etudies dans six
centres au Malawi.  Les traitements qui ont consiste a la
non-inoculation et a l'inoculation; la fertilisation entre 0
et 17.5 kg P par hectare-1; 0 et 30 kg S par hectare-1, et 1
kg Mo l'hectare. Un systeme de controle du nitrogene a 100 kg
N par hectare-1 etait inclus. Pour identifier les elements
nutritifs qui ont limite la reaction a l'inoculation, P, S et
Mo etaient soit appliques ou non appliques aux plantes
inoculees.  Dans tous les centres d'etudes, il n'y avait pas
de reactions sensibles (P<0.05) du nombre de nodule a
l'inoculation.  Lerendement de graines a augmente de 39% grece
a l'inoculation a Champira.  Le changement de la fertilite du
sol a augmente le nombre de nodules de 387 a 426% dans trois
centres sur quatre.  Il y a aussi eu, d'augmentations
importantes (entre 31% et 35%) en productions des grains a
cause du changement de la fertilite du sol qui a eu lieu dans
deux sites.  Plus au moins l'un des trois elements nutritifs
etait identifie comme une nodulation qui se limite a chaque
site, mais les rendements des grains etait identifie comme une
nodulation qui se limite a chaque site, mais les rendemets des
grains etaient seulement affectes par la deficience P a Sokola
et la deficience M a Champira.  Par consequent, pour alleger
les elements nutritifs des deficiences et augmenter les
occupations des nodules par les lignees effectives des
inoculants sont les moyens par lesquels les reaction dans les
champs d'haricot a l'inoculation pourraient etre augmentes.

Mots Clés
Champ d'haricot, fixation du nitrogene, nodulation, fertilite du sol

© Copyright 1996 - African Crop Science Society

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