Syahrul Mubarok, Syahrul (2021) Applications of Rhizobium sp Isolates from Ponorogo and Reduction of N (Urea) Fertilizer in Soybean (Glycine max L) Gepak Kuning Variety. D4 Diploma thesis, Universitas Darussalam Gontor.

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Abstract

The low local soybean production causes the fulfillment of soybean that make it needs to be imported from abroad. Increasing soybean production can be done by utilizing local Rhizobium sp bacteria which can meet the nitrogen needs of soybean plants and reduce the use of chemical fertilizers. The purpose of this study was to determine the application response of Rhizobium sp from Ponorogo and to reduce the dose of N (Urea) fertilizer on the growth and production of gepak kuning soybean plants. The research was conducted in the Agrotechnology Laboratory of Darussalam Gontor University and the Brahu Village experimental field from February-May 2020. The study used a completely randomized factorial design with two treatment factors and 3 replications. The first factor is the application of Rhizobium sp (10 ml concentration) consisting of R0 (control / without Rhizobium sp), R1 (Rhizobium sp Siman Isolate), R2 (Rhizobium sp Mlarak Isolate 1), R3 (Rhizobium sp Mlarak Isolate 2). The second factor is the reduction in the dose of N (Urea) fertilizer consisting of N0 (control / without N fertilizer), N1 (100% dose (0.250 g / polybag)), N2 (75% dose (0.187 g / polybag)), N3 (50% dose (0.125 g / polybag)), N4 (25% dose (0.063 g / polybag)). The application of Rhizobium sp from Ponorogo had a significant effect on the production of soybean plants. The results of the treatment research (R1) Rhizobium sp from Siman Isolate showed a better value in the production of yellow gendang soybean plants compared to other treatments. The results of reducing the dose of N fertilizer for gepak kuning for each treatment parameter were not significantly different.

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