Application of Biofertilizer and Two Types of Phosohorus Fertilizers to Omprove Nitrogen and Phosphorus Uptake as Well as Soybean (Glycine max L. Merr.) Growth on Ultisol Soil

Abstract

The research aims to know the effect biofertilizer, two sources P fertilizer and the interaction of biofertilizer and two sources P fertilizer to N and P uptake and the growth of soybean at Ultisol. This research was conducted on the Screenhouse Faculty of Agriculture University of North Sumatera, Medan. It used Randomized Block Design with 2 treatment factors and 3 replications. The first factor was biofertilizer, consist of : without the application, 10⁸ CFU/mL Rhizobium sp.                  (5 mL/plant), 10⁸ CFU/mL Burkholderia cepacia (5 mL/plant), combination 10⁸ CFU/mL Rhizobium sp. (5 mL/plant) and 10⁸ CFU/mL Burkholderia cepacia (5 mL/plant). The second factor was the sources P fertilizer, consist of :  without the application P, 1.8 g/plant SP-36, 2.1 g/plant RP. The results showed that application of biofertilizer significantly increased soil pH, population of phosphate bacteria, total effective root nodules, shoot dry weight and P uptake of soybean at Ultisol. The best treatment of combination Rhizobium sp. and Burkholderia cepacia. The application P fertilizer significantly increased soil pH, P available, total effective root nodules, shoot dry weight, root dry weight, N and P uptake of soybean at Ultisol. The best treatment of          SP-36 1.8 g/plant. The interaction between biofertilizer and P fertilizer significantly increased                   P uptake of soybean at Ultisol. The best treatment of Burkholderia cepacia with SP-36 fertilizer.