Pemanfaatan Jerami Padi sebagai Pupuk Organik untuk Meningkatkan Pertumbuhan dan Produksi Padi (Oryza sativa)
Sitepu, Rosinta Br
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The leveling off of rice production in Indonesia is mainly caused by degradation of wetlands, which could be characterized by low organic matter content. The factors that cause this issue such as the utilization inorganic fertilizer only, the habit of farmers by carrying out rice straw off from wetland or burning of rice straw. The objectives of this research were (1) to test the ability of decomposers in speeded up the decomposition process of rice straw,( 2) examined the effect of organic fertilizer on the growth and yield of rice. The experiment used completely randomized block design. The treatment was tested of decomposers namely control/no decomposers (D0), decomposers collection of Prof Iswandi Anas, and commercial decomposers. The treatments in field experiment namely NPK 100%, NPK 50%, NPK 50% + PO1, and NPK 50% + PO2 + PB. PO1 and PO2 was an organic fertilizer that each decomposed by D1 and D2, while PB was a bioorganic fertilizer. Application of decomposers in this experiment did not speed up the decomposition of rice straw, because the rice straw had been decomposed. It was indicated by the low C/N. There was a possibility of the presence of decomposers microbes in control because of the straw was saved for 10 days in humid conditions. Application of 50% NPK with organik fertilizer to 100% NPK was not significantly meant application of NPK fertilizer on field research was sufficient at 50% dose, so that the role of organic fertilizer could not be evaluated. However, there was a tendency of enhancing growth and yield of rice in addition of decomposed organic fertilizer by decomposers.