Abstract:
A pot experiment was carried out to study the effect of two types of mycorrhiza
isolated from sorghum, and onion crops as compared to the addition of
phosphorus (P) chemical fertilizer on the growth of sorghum, grown on clay soil
from Khartoum state, Sudan.
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The experiment was conducted during June–August 2011 under shadow in the
demonstration farm, Sudan University, College of agricultural Studies, Shambat
"lat.(15o 40 N) long(32o 32E ) ,Sudan.
The biofertilizer was added at the rate of 300 spores / pot. While the chemical
fertilizer was applied at the recommended dose 0.03g/treated pot (40kg triple
superphosphate/ha).The
design
adopted
was
Completely
Randomized
Design(CRD) with three replicates.
Plant samples were taken after four weeks from sowing and after harvest(8
weeks from sowing) to determine root colonization by mycorrhiza, plant height,
root length,
shoot dry weight, and root dry weight. In addition to shoot
phosphorus content and spores density after harvest.
The results indicated significant differences in root colonization after four weeks
from sowing and at harvest, upon addition of sorghum mycorrhiza compared to
onion mycorrhiza . The infection was depressed when phosphorus chemical
fertilizer (P) was added to both types of mycorrhiza .However, the addition of
mycorrhiza alone was superior to the addition of mineral P with mycorrhiza and
to addition of P alone.
The results also indicated significant differences in plant height, root length,
shoot dry weight, and root dry weights.The best results were obtained upon the
addition of the sorghum mycorrhiza, compared to onion mycorrhiza.But when
phosphorus fertilizer was used with mycorrhiza, all the measured traits were
depressed.
Also, results indicated significant differences in spores density.High density was
obtained when sorghum mycorrhiza was added alone and with onion mycorrhiza
when mineral P was added as compared with other treatments.
The results revealed a highly significant differences in shoot phosphorus
especially when the plants inoculated with sorghum mycorrhiza , followed by
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.to other treatments and control
