No abstract

Red pepper production in 2016-2017 was increased. Although production has increased, demand for pepper will continue to increase, and efforts to increase soil fertility still need to be sought. To maintain and increase soil productivity, a combination of inorganic fertilizers with appropriate organic fertilizers is needed. One of the organic fertilizers is biofertilizers. This research aimed at finding out the formulation and dosage of biological fertilizers consortium of cellulolytic bacteria based on organic liquid waste that was appropriate for the growth and yield of red pepper plants. This research method used a Completely Randomized Design with 12 treatments, namely (5, 10, 15) ml of biological fertilizer of waste water washing rice, (5, 10, 15) ml of biological fertilizer of coconut water waste, (5, 10, 15) ml of biological fertilizer of tofu water waste, (5, 10, 15) ml of palm oil liquid fertilizer. The results showed that all biological fertilizer application based on organic liquid waste cellulolytic was able to give varied results on each parameter observed so that all wastes could be applied to pepper plants. Tofu wastewater biofertilizer with a dose of 10 ml give a good response to the production of pepper plants compared to other treatments.

One of the organisms that helps in decomposition of oil palm empty fruit bunches is Oryctes rhinoceros L. larvae. This is because of in the gut of the larvae there are many cellulolytic bacteria and lignoliytic. The process of accelerating the decomposition of oil palm empty fruit bunches into compost can be done by optimizing the work of the bacteria. The aim of this research is to obtain cellulolytic and lignolytic bacteria from larvae O. rhinoceros L.. The research succeeded to isolate 24 isolates of cellulolytic bacteria and lignolytic bacterial isolates from the gut of O. rhinoceros larvae. Based on qualitative test, 9 isolate bacteria produced cellulolytic index above 2. The highest cellulolytic index was generated by ORL19 isolate, while the lignolytic index obtained ORL6 isolate. Based on macroscopic and microscopic identification of bacteria, biochemical and physiological tests,  it was found ORL 6 belongs to the genus Bacillus sp. while the ORL 19 belongs to the genus Citrobacter sp..

Limitations of productive land causing agricultural extension leads on marginal land. Peatlands are one type of land including the criteria for marginal land. Destruction of peatland ecosystems arising from land management and the selection of one commodity which is not in accordance with the characteristics of peatland. Damage criteria peat in government regulations to function cultivation is more than 0,4 m below the peat surface. One alternative for the agricultural development of peatlands associated with groundwater levels ≤0,4 m to do with the development of food crops, especially rice crops. This is because the root system of the rice crop is only about 40-50 cm categorized shallow roots, thus suitable for development on peatland shallow. This study aims to determine the response growth and yield of rice plants with organic and inorganic fertilizer application by microbial cellulolytic on peat soil. The experimental was conducted from November 2017 to January 2018 in Laboratory of Soil Science and Plant Laboratory, Faculty of Agriculture at Universitas of Riau. The research was conducted using a completely randomized design (CRD), which consists of 7 treatments and 4 replicates so on May 28 experimental units. As for the treatment Control, 50% inorganic fertilizer, 100% inorganic fertilizer, 80 grams of composted rice straw, 160 grams of litter rice straw + 160 ml consortium of microbes, 80 grams of composted rice straw + 50% inorganic fertilizer, 160 grams of rice straw litter + 160 ml of microbial consortium selulitik + 50% inorganic fertilizer. The results showed that addition of 160 g of rice straw litter + 160 ml of microbial + 50% inorganic fertilizer consortium was the best treatment by producing tillers reaching 54,87 tillers, the number of grain per panicle reached 130.57 grains with crop grain weight reaching 57.27 grams, with a percentage of empty the lowest is 3.62%.

The low productivity of paddy in Langsat Permai Village, Bunga Raya District, Siak Regency, one of them is causes the unavailability of sufficient water for crop cultivation, so it is necessary to do water management by making canal blocking to be used on rice plants in the area. This is done to meet the water needs of rice plants during the dry season. Therefore, assistance is provided through water management in Langsat Permai Village, Bunga Raya District, Siak Regency. Mentoring strategies are carried out by discussing directly with farmer groups about the impact of making canal blocking. Through this activity, the availability of water for rice plants during the dry season is fulfilled. Production of 1 Ha of rice before the blocking canal produced 4-5 tons/harvest to 6-7.8 tons/harvest after the canal blocking.

Rice production in Riau Province is lower than demand. One of the efforts made is the use of organic fertilizer based on organic liquid waste, in addition to reducing the use of inorganic fertilizers. The method that can be applied to support rice yield is the use of cellulolytic bacterial consortium applications. This study aimed to finding out the formulation and dose of biological fertilizer based on cellulolytic bacteria based on the organic liquid waste that was good for growth and yield of upland rice. This research used a Completely Randomized Design which consisted of 12 treatments, namely of biofertilizer of rice washing water, biofertilizer of coconut water, biofertilizer of wastewater tofu, biofertilizer of palm oil mill with doses 5, 10, 15 ml. The result showed that all biofertilizers based on organic wastewater cellulolytic consortium could provide varied results on all parameters of observation so that all biological fertilizers could be applied to upland rice plants with the use of inorganic fertilizers at half the recommended dose. Biofertilizers from rice washing water with a dose of 10 ml gave a good response to the growth and yield of upland rice compared with other treatments.

Oil palm (Elaeis guineensis Jacq.) holds a very strategic role in the Indonesia economy. Plants that have reached the economical age of 25 years need to be replanted using qualified oil palm seedling. The qualified seedling is obtained through proper fertilization. The combination of NPK fertilizer and organic material of oil palm empty fruit bunches (OPEFB) which has been given a cellulolytic bacterial consortium can provide sufficient nutrients for the growth of oil palm seedlings. The study aimed to determine the effect of giving a combination of OPEFB organic material, cellulolytic bacterial consortium, and NPK fertilizer on the growth of oil palm seedling (Elaeis guineensis Jacq.) at main nursery. This experiment used a single factor experiment arranged in a Completely Randomized Design (CRD). The treatments were a 100% NPK, a OPEFB compost, a 50% NPK + OPEFB compost, a 50% NPK + OPEFB + Cellulolytic bacterial consortium, and a OPEFB + cellulolytic bacterial consortium. The results showed that the application of inorganic fertilizers combined with organic fertilizers (a OPEFB compost and a OPEFB + cellulolytic bacterial consortium) had a good effect on each parameter. Giving organic fertilizer without inorganic fertilizer had not affected plant growth on all parameters. Application of a OPEFB compost and a OPEFB + cellulolytic bacterial consortium can reduce the use of inorganic fertilizers by 50%.

The efficiency of fertilizing N on oil palm plants on peatlands in several companies is done by planting legume cover crop, one of which is Mucuna bracteata. This plant can form root nodules because it can symbiosis with rhizobium bacteria which will make fixation of N2 in the air so that the bound N elements can be utilized by plants. This bacterium grows naturally on legume cover crop. This study aims to explore and characterize adaptive rhizobium bacteria in peatlands. The location of sampling is done at PT. Jatimjaya Perkasa, Kubu District, Rokan Hilir Regency. Sampling of root nodules by stratified random sampling. The results obtained by eight bacterial isolates that have relatively similar macroscopic and microscopic characteristics and belong to rhizobium based on the YEMA + CR and YEMA + BTB tests.