| Abstrakt: |
This research tracked N, P and K content of six biofertilizers during the fermentation process. The experiment consisted of six biofertilizers and five fermentation times (3, 7, 15, 22 and 30 days after preparation [DAP]). The biofertilizers were prepared on the same basis for fermentation, adding (in 15 L of water): T1 = castor bean cake (2 kg), T2 = blood meal (2 kg), T3 = hoof and horn powder (2 kg), T4 = bone meal (2 kg), T5 = blood meal (1 kg); T6 = bone meal (1 kg). The experimental design was a randomized block design with three replications. The biofertilizer hoof and horn powder were higher N content than the others, reaching 6.77 g L-1, whereas the bone meal (1 and 2 kg) had the lowest content, reaching 1.43 and 1.93 g L-1, respectively. At all fermentation times, the castor bean cake (3.23 g L-1) and hoof and horn powder (2.61 g L-1) biofertilizers showed higher P content than bone meal (1 and 2 kg) biofertilizers. Castor bean cake biofertilizer had higher K content (2.49 g L-1) than hoof and horn powder (1.86 g L-1), blood meal (1.69 and 1.60 g L-1), bone meal (1.57 to 1.68 g L-1) biofertilizers. Regardless of the type of biofertilizer, the K content had no change, the N content and the electrical conductivity increased, and the P content reduced during fermentation time until 30 DAP. [ABSTRACT FROM AUTHOR] |
