KETERSEDIAAN HARA NITROGEN DAN PERTUMBUHAN TANAMAN BAWANG DAUN (Allium fistulosum L.) PADA LAHAN GAMBUT YANG DIAPLIKASI DENGAN MIKROBA PENAMBAT NITROGEN

Abstract

The problem for crop cultivation on peatlands is low soil pH, this causes the nutrient content in a form that can be absorbed by plants is also low. One of the nutrients in peatlands with low availability is nitrogen. One solution in crop cultivation to overcome the problem of low nitrogen availability is the application of microbes that have the ability to fix N. The purpose of this study was to determine the availability of N on peatlands  by Nitrogen-fixing microbes. This study was a field trial using a completely randomized completely design (CRD) with the treatment applied was (1) Peat soil + 20 tons ha^-1 manure + 200 kg ha^-1 urea + 300 kg ha^-1 SP 36, (2) Peat soil + 20 tons ha^-1 manure + 200 kg ha^-1 urea + 300 kg ha^-1 SP36 + Nitrogen-fixing microbes, (3) Peat soil + 20 tons ha^-1 manure + 50 kg ha^-1 urea + 300 kg ha^-1 SP36 + Nitrogen-fixing microbes, (4) Peat soil + 20 tons ha^-1 manure + 100 kg ha^-1 urea + 300 kg ha^-1 SP36 + Nitrogen-fixing microbes, (5) Peat soil + 20 tons ha^-1 manure + 150 kg ha^-1 urea + 300 kg ha^-1 SP36 + Nitrogen-fixing microbes, (6) Peat soil + 20 tons ha^-1 manure + 200 kg ha^-1 urea + 300 kg ha^-1 SP36 + Phosphate solubilizing microbes, (7) Peat soil + 20 tons ha^-1 manure + 200 kg ha^-1 urea + 150 kg ha^-1 SP36 + Phosphate solubilizing microbes, (8) Peat soil + 20 tons ha^-1 manure + Nitrogen-fixing microbes + Phosphate solubilizing microbes. The results showed that the application of nitrogen-fixing microbes had an influence on available N, N-plants, N-total soil, plant dry weight, EC.The problem for crop cultivation on peatlands is low soil pH, this causes the nutrient content in a form that can be absorbed by plants is also low. One of the nutrients in peatlands with low availability is nitrogen. One solution in crop cultivation to overcome the problem of low nitrogen availability is the application of microbes that have the ability to fix N. The purpose of this study was to determine the availability of N on peatlands  by Nitrogen-fixing microbes. This study was a field trial using a completely randomized completely design (CRD) with the treatment applied was (1) Peat soil + 20 tons ha^-1 manure + 200 kg ha^-1 urea + 300 kg ha^-1 SP 36, (2) Peat soil + 20 tons ha^-1 manure + 200 kg ha^-1 urea + 300 kg ha^-1 SP36 + Nitrogen-fixing microbes, (3) Peat soil + 20 tons ha^-1 manure + 50 kg ha^-1 urea + 300 kg ha^-1 SP36 + Nitrogen-fixing microbes, (4) Peat soil + 20 tons ha^-1 manure + 100 kg ha^-1 urea + 300 kg ha^-1 SP36 + Nitrogen-fixing microbes, (5) Peat soil + 20 tons ha^-1 manure + 150 kg ha^-1 urea + 300 kg ha^-1 SP36 + Nitrogen-fixing microbes, (6) Peat soil + 20 tons ha^-1 manure + 200 kg ha^-1 urea + 300 kg ha^-1 SP36 + Phosphate solubilizing microbes, (7) Peat soil + 20 tons ha^-1 manure + 200 kg ha^-1 urea + 150 kg ha^-1 SP36 + Phosphate solubilizing microbes, (8) Peat soil + 20 tons ha^-1 manure + Nitrogen-fixing microbes + Phosphate solubilizing microbes. The results showed that the application of nitrogen-fixing microbes had an influence on available N, N-plants, N-total soil, plant dry weight, EC.