Abstract
Biofertilizer which contain rhizobacteria Azotobacter increase soil fertility and improve plant growth through nitrogen fixation and phytohormone production. The objective of this study was to compare the responses of soybean (Glycine max (L.) Merill) plants in dry land after the application of several Azotobacter inoculation methods. Field experiments were carried out with a randomized block design consisting of five treatments with five replicates each. The treatments were seed inoculation, soil treatment before planting, soil treatment after planting and plant dressing. Plant inoculation with Azotobacter treated with half of recommended dosage urea while the control plant received recommended dose urea. The experimental results showed that all application methods did not affect soybean production, number of nodules, Azotobacter populations in the rhizosphere and N total soil; but Azotobacter inoculation through leaves increased N uptake and weight of 100 soybean seeds.
Highlights
Pupuk hayati dengan bahan aktif rizobakteri Azotobacter mampu meningkatkan kesuburan tanah dan meningkatkan pertumbuhan tanaman melalui fiksasi nitrogen dan produksi fitohormon
The results suggested that best inoculation method was by spraying on the leaves
Effects of Nitrogen Concentrations on Nodulation and Nitrogenase Activity in Dual Root Systems of Soybean Plants
Summary
Penelitian exprimental dilaksanakan pada JuliNovember 2015 di kebun percobaan Fakultas Pertanian Universitas Padjadjaran, Kecamatan Jatinangor, Kabupaten Sumedang, pada ketinggian 765 meter di atas permukaan laut. Tanah di lahan percobaan adalah Inceptisols dengan pH 5,8, bertekstur liat dengan kesuburan tanah rendah. Inceptisols mengandung Corganik rendah 1,58%, N-total rendah 0,2%, CN 8, P2O5 dan K2O total rendah masingmasing 14,27mg/100 g dan 19,02 mg/100 g, Kapasitas Tukar Kation tanah dan Kejenuhan Basa sedang masing-masing 21,7 cmol/kg-1 dan 56,6% sedang. Arjasari jenis determinate (pertumbuhan terhenti setelah tanaman berbunga) adalah koleksi Program Studi Pemuliaan Tanaman Fakultas Pertanian. Dan Bradyrhizobium diisolasi dari rizosfer kedelai yang diperoleh dari Balai Penelitian Tanaman Kacang dan Umbi Malang Bakteri Azotobacter sp. dan Bradyrhizobium diisolasi dari rizosfer kedelai yang diperoleh dari Balai Penelitian Tanaman Kacang dan Umbi Malang
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