Ameliorasi Rizosfer Kedelai Menggunakan Jerami, Abu Sekam, dan Dolomit

Successful saturated soil culture practices in tidal land to increase soybean production needs to be supported by amelioration. The rhizosphere is an area where the intensive reciprocal relationship between plants, soil, and soil microorganisms occured. However, the effect of amelioration through the rhizosphere is still unclear. This research aimed to study the effect of amelioration using rice straw, rice husk ash, and dolomite on the rhizosphere on the growth and production of soybean. The research was conducted in tidal swamp land type B overflow from May to August 2019. The experimental design used was a split-split plot design with rice straw, rice husk ash, and dolomite as the main plot, subplots, and sub subplots, respectively. Rice straw was applied by embedding in the soil, while rice husk ash and dolomite were applied to the rhizosphere during planting. The observations included plant biomass dry weight, leaf nutrient concentration of P, Fe, and Al, number of filled pods, and soybean productivity. The application of rice husk ash with rice straw or with dolomite increased soybean growth and production. The combination of 400 kg ha-1 of rice husk ash and 4 ton ha-1 of rice straw yielded the highest productivity with the value of 2.94 ton ha-1. Keywords: abiotic stresses, rhizosphere, saturated soil culture, tidal land