<![CDATA[AbstrakMasyarakat Desa Slateng Kecamatan Ledokombo Kabupaten Jember lereng Gunung Raung berada di landform vulkanik mayoritas bermata pencaharian dalam bidang pertanian. Komoditas pertanian yang dikembangkan yaitu tanaman pangan, tanaman hortikultura, dan perkebunan. Kendala yang dihadapi yang mengancam dalam proses pertanian masyarakat rendahnya kadar nitrogen dalam tanah (< 1%) sehingga mengakibatkan daun tanaman menguning dan dapat menurunkan hasil produktivitas tanaman 50% dari potensi yang seharusnya. Permasalahan tersebut penting untuk diselesaikan sehingga produktifitas sesuai yang diharapkan. Tujuan kegiatan penerapan teknologi pupuk organik cair nitrobacter dari alam sebagai upaya peningkatan produktifitas tanah lahan vulkanik lereng gunung raung. Metode penyelesaian masalah melalui sosialisasi, pelatihan dan praktek langsung pemanfaatan bahan alam melalui peran aktif peserta dalam pembuatan nitrobakter. Kegiatan program pengabdian dihadiri 25 peserta oleh kelompok tani harapan pengurus kelompok tani, sekretaris desa, dan petugas penyuluh dari dinas pertanian dan hortikultura kabupaten Jember. Hasil kegiatan meningkatan pengetahuan dan keterampilan peserta 50 % yang sebelumnya pemahaman terkait dengan Nitrobakter hanya 40% menjadi 80%. Kata kunci: degradasi lahan, nitrogen; kesuburan tanah; pupuk hayati cair Abstract The people of Slateng Village, Ledokombo District, Jember Regency, on the slopes of Mount Raung, located on volcanic landforms, the majority make their living in agriculture. The agricultural commodities developed are food crops, horticultural crops, and plantations. The obstacles faced that threaten the community's agricultural process are low levels of nitrogen in the soil (< 1%) which cause plant leaves to turn yellow and can reduce plant productivity results by 50% of their potential. It is important to solve these problems so that productivity is as expected. The aim of the activity is to apply nitrobacter liquid organic fertilizer technology from nature as an effort to increase soil productivity on the volcanic slopes of Mount Raung. Problem-solving methods through socialization, training, and direct practice in the use of natural materials through the active role of participants in making nitrobacteria. The service program activities were attended by 25 participants from the farmer group Hope, farmer group administrators, village secretaries, and extension officers from the Jember district agriculture and horticulture service. The results of the activity increased participants' knowledge and skills by 50%, from previously only 40% understanding regarding Nitrobacteria to 80%. Keywords: land degradation; nitrogen; soil fertility; liquid biofertilizer]]>
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