Abstract

The development and improvement of cultivation techniques can be done to improve soil fertility; one of the techniques is the application of organic matter. This research intends to study the interaction between Azolla application treatments with different doses of inorganic fertilizers and find out the appropriate dose of Azolla for inorganic fertilizers. This study was conducted in the experimental field of the faculty of agriculture at the university of Brawijaya located in Jatimulyo Village, Lowokwaru sub-district, Malang City in June and November 2021. This study used a split-plot design with 4 levels of N fertilizer dose as the main plot and 4 levels of Azolla dose as the subplot. The total combination of treatments was 16 and was repeated 3 times, so the total experimental plots were 48 plots. Azolla treatment with a dose of 6,800 kg ha-1 and fertilizer N 166.41 kg ha-1 had better growth compared to other doses of Azolla and fertilizers N. In the yield component, there was an interaction between Azolla and N fertilizer, except for the variable percentage of grain. Azolla treatment with the dose of 6,800 kg ha-1 along with the used fertilizer N in the dose of 166.41 kg ha-1 can increase the productivity of paddy plants by 10-20.5%, the increase in rice yields is obtained by increasing the nitrogen content of the soil through the application of Azolla as green fertilizer.

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