Abstract

The research aimed at examining the impact of fertilizer doses and concentration of liquid organic fertilizers (LOF) treatment on soybean yield. The hypotheses of this study was that LOF effectively influenced soybean yield. The research was conducted in factorial scheme with two factors randomized. Two different treatments were applied (TA and TB). TA is the treatment with basic fertilizer (urea, triple super phosphate (TSP) and KCl), TA1 - (40 kg Urea/ha, 90 kg TSP/ha, and 90 kg KCl/ha); TA2 - (45 kg Urea/ha, 95 kg TSP/ha, and 95 kg KCl/ha) and TA3 - (50 kg Urea/ha, 100 kg TSP/ha and 100 kg KCl/ha). TB is the treatment with LOF concentration (sugarcane pulp waste and sugarcane skin). TB0 (without LOF, control), TB1, TB2 and TB3 are treatments with concentrations of 7.1, 10.7 and 14.3% of the LOF, respectively. Thus, the experiment presented 12 combined treatments (3 × 4) and each treatment was performed in triplicate, totaling 36 experimental plots. The results showed that basic fertilizer doses treatment had no significant effect on soybean yield, while LOF concentration treatment at 14.3% gave better result on soybean yield. Therefore, it can be concluded that LOF treatment can increase soybeans yield by up to 2.36 Mg/ha.

Key words: Soybean, basic fertilizer, waste, liquid organic fertilizers (LOF).