EFFECTS OF RHIZOBIA AND PHOSPHATE-SOLUBILIZING BACTERIA ON SOYBEAN (Glycine max L. Merr.) CULTIVATED ON FERRALSOLS OF DAKLAK PROVINCE, VIETNAM
Prof. Dr. Cao Ngoc Diep*, Duong Ba So, Nguyen Ba Trung and Phan V?n Ha Lam
ABSTRACT
Two field experiments were conducted during 2015 at DakLak
province to study the effects of rhizobia and phosphate-solubilizing
bacteria (PSB) on soybean (cv. Cujut) cultivated on ferralsols. In the
first experiment was carried out at Centre for Agriculture Research,
Western Highland Agricultural Institute (at Buon Ma Thuot city),
consisted of five treatments as follows: control (no fertilizer, no
inoculant), 400 kg/ha NPK 15-15-15, rhizobial inoculant [with liquid
cover seeds] + 20 kg N/ha applied at 10 days after sowing [DAS], PSB
inoculant [with liquid cover seeds] + 20 kg N/ha at 10 DAS, rhizobial
and PSB inoculant [with liquid cover seeds] + 20 kg N/ha at 10 DAS
from April to August, 2015. In the second experiment was carried out
at Buonho town, consisted of four treatments as control (no fertilizer,
no inoculant), 100 kg/ha thermophosphate (15% P2O5) + 25 kg/ha
NPK 16-16-8 applied at 20 and 40 at DAS, rhizobial and PSB inoculant [with liquid cover
seeds] + 200 kg biofertilizer + 20 kg N/ha at 10 DAS and rhizobial and PSB inoculant [with
liquid cover seeds] + 400 kg biofertilizer + 20 kg N/ha at 10 DAS. The results showed that
application of rhizobial inoculant and/or PSB inoculant produced significantly higher yield
component, grain yield than control and did not differ from 400 kg/ha NPK 15-15-15 in the
experiment 1. In the second experiment, using biofertilizer for soybean cultivation supported
higher yield component, grain yield and oil, protein in seed than control and equivalent with
treatment of 100 kg/ha thermophosphate (15% P2O5) + 25 kg/ha NPK 16-16-8. It therefore seems that biofertilizers can be considered as a replacement for part of chemical fertilizers in
soybean cultivation on ferralsols.
Keywords: Highland, Ferralsols, Phosphate-solubilizing bacteria, Rhizobia, Soybean.
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