Abstract:
Soybean is one of the important food crops as a source of protein. Nowadays, soybean
production should be increased due to higher demand in certain region in Indonesia.
Biofertilizer inoculation combine with chemical fertilizer is suggested to increase the soil fertility
to support soybean cultivation and decrease the use of chemical fertilizer. The pot experiment
was conducted to get the information concerning nodulation, nitrogen uptake and growth of
soybeans (Glycine max L.) after biofertilizer and Nitrogen (N), Phosphorous (P) as well as
potassium (K) single fertilizer application. The experiment was set up in a randomized block
design with seven treatment and four replications. The treatments consisted of two doses of
biofertilizer (3 L ha-1
and 5 L ha-1
) combined with three doses of N, P, K fertilizer (50%, 75%
and 100% recommended dosage). The pot control received no biofertilizer. Consortium
biofertilizers contained N-fixing bacteria (Azotobacter chroococcum, A. vinelandii, Azospirillum
sp. and endophytic Acinetobacter sp.) and phosphate solubilizing microbes (Pseudomonas
cepaceae and Penicillium sp.). The results of experiment showed that the application of
biofertilizer 5 L ha-1
combined with 75% chemical fertilizer increased the nodules number,
nitrogen uptake and dry weight of plant at the end of vegetative stage. This study suggested that
biofertilizer might be used to increase growth of soybean and chemical fertilizer efficiency.
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