Urea intensive application is considered to reduce soil quality, and food quality. The constraints of urea application in tropics are low effectivity due to intensive leaching and volatilization. In order to decrease the urea dose, cheap and renewable biofertilizer application is suggested. Coating urea with biofertilizer become an easy way to apply both biofertilizer. In the previous research, biofertilizer-coated urea (BCU) had been formulated by using Bacillus subtilis, B. megaterium, Azotobacter chroococcum and A. vinelandii. The objective of this research was to verify the effect of BCU on the growth and yield of lettuce (Lactuca sativa L.) cv. Romaine; and decrease of urea dose in a planting season. The field experiment was arranged in randomized block design with five treatments and five replications. Lettuces were treated with a dose and half dose of two BCU formulations. The results showed that BCU didn’t affect growth, P uptake and plant yield but half dose of BCU produced the same lettuce productivity with one dose of urea. Half dose of BCU resulted in the same shoot N uptake as one dose of urea but a dose of particular BCU formulation possibly decreased N uptake. The population of total Bacillus and Azotobacter in the rhizosphere was determined by dose and BCU formulation but they didn’t change abruptly after BCU application. The experiment suggested that application of urea coated by carrier-based biofertilizer was reliable to support lettuce cultivation and reduce the urea dose.

Consortium biofertilizer containing Nitrogen (N) Fixing Bacteria and Phosphate (P) Solubilizing Bacteria may substitute inorganic fertilizer in vegetable production. A greenhouse experiment was conducted to evaluate the effect of some combinations and doses of consortium biofertilizer and NPK compound fertilizer on available N and P in the soil, fresh weight of caysim (Brassica chinensis L. var. parachinensis.), and their uptake by caisim shoots after grown in low fertility soil. The experimental design was a randomized block design consisting of seven combinations and doses of consortium biofertilizer and compound fertilizer; and three control treatments. All treatments were repeated three times. The results showed that the combination of the which combination treatment of inorganic fertilizer and biofertilizer had a significant effect on the fresh weight of caysim shoots, available P and N and P uptake after harvesting compared to the biofertilizer treatment alone or without fertilization. Several treatments of combined doses of biofertilizers and NPK compound fertilizer produced the same yield as NPK compound fertilizer alone. The application of 300 kg/ha of compound fertilizer combined with 3,75 L/ha of biofertilizer enabled to increase the yield up to 16% compared to NPK fertilizer alone. This experiment explained that inoculation of biofertilizers can reduce the dose of NPK fertilizer to maintain yield, available P residue in soil and P uptake

Growth and production of corn plants require land with sufficient nutrients. Utilization of biological fertilizers and organic materials carried out with the aim of increasing the yield of corn. The treatments that were tried were the provision of compost, livestock manure, compost and livestock manure, each of which was added by spraying a consortium of biological fertilizer. The experiment was designed using a randomized block design with five replications. The results showed that the application of organic-based fertilizers affected plant height from 17 - 49 days after planting, weight of fruit with kelobot, weight of cob and ear length. Provision of compost or livestock manure and added with a biological fertilizer consortium by spray gives a higher effect compared to the provision of compost or livestock manure which is not added to the consortium of biological fertilizer. To increase the productivity of maize plants it is recommended to use a consortium of biological fertilizers applied by spraying at intervals of seven days until the plants are 49 days after planting.