Abstract:
Biofertilizers are inoculants made from beneficial microorganisms that have capability to
enhance the nutrient availability for plants and increase plant growth. The purpose of this
research was to study the effect of biofertilizerscontaining N-fixers and P-solubilizers and
inorganic fertilizers on soil nitrogen and P-available of Andisols. This experiment used a
Randomized Block Design (RBD) in factorial pattern, consisting of two factors with three
replications. The first factor consisted of biofertilizers, which were ; without biofertilizers;
Biofertilizers A(Pseudomonas mallei, P. cepaceae, Aspergillusniger and Penicillium sp.,
Azotobacter sp., Azospirillum sp.);Biofertilizer B (Azotobacterchoroococum, A. viilandii,
Azospirillum, Pseudomonas cepaceae, Penicillium and Acitenobacter) and Biofertilizers A+B.
The second factor were NPK fertilizers with four levels (100%, 75%, 50% and 25% dosage of
recommendation). The results showed that the application of biofertilizerscontaining N-fixers
and P-solubilizers increased soil P-available, soil N and fertilizer efficiency on Andisols. |
