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Sakiah Sakiah
Budidaya Perkebunan, Institut Teknologi Sawit Indonesia, Indonesia
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Education Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Veterinary Other

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Distribusi Kadar Hara Nitrogen, Fosfor, dan Kalium pada Profil Tanah di Lahan Kelapa Sawit Perkebunan Rakyat Kecamatan Kuala, Kabupaten Langkat Alvin Cristi Sitepu; Sakiah Sakiah
Tabela Jurnal Pertanian Berkelanjutan Vol. 4 No. 2 (2026): Edisi Juli
Publisher : Ilmu Bersama Center

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56211/tabela.v4i2.1932

Abstract

Penelitian ini bertujuan untuk menentukan distribusi vertikal dan status N, P, dan K dalam profil tanah perkebunan kelapa sawit skala kecil di Kecamatan Kuala, Kabupaten Langkat, Sumatera Utara. Penelitian ini dilakukan di tiga desa yaitu Raja Tengah, Balai Kasih, dan Parit Bindu menggunakan metode survei deskriptif. Dua lubang profil tanah dibuat di setiap desa, dan sampel tanah dikumpulkan pada tiga kedalaman (0–20, 20–40, dan 40–60 cm), menghasilkan total 18 sampel. Sampel dianalisis menggunakan metode Kjeldahl untuk N, Bray II untuk P, dan ekstraksi NH4OAc pH 7 untuk K, kemudian dibandingkan dengan kriteria nutrisi tanah Lembaga Penelitian Tanah Indonesia (2005). Hasil penelitian menunjukkan bahwa kandungan N secara konsisten menurun seiring kedalaman di semua lokasi (0,07–0,33%), sedangkan P (<0,01–22,02 ppm) dan K (0,07–0,88 me/100 g) sangat bervariasi di antara lokasi dan kedalaman. Raja Tengah dan Parit Bindu didominasi oleh status N rendah, P sangat rendah, dan K sangat rendah, sedangkan Balai Kasih didominasi oleh status N rendah, P sedang, dan K sedang hingga tinggi. Perbedaan antar lokasi dikaitkan dengan topografi, drainase, dan bahan induk tanah. Disimpulkan bahwa pengelolaan pupuk pada lahan kelapa sawit skala kecil di Kabupaten Kuala harus spesifik lokasi dan berdasarkan analisis profil tanah, bukan praktik seragam berdasarkan pengalaman.
Biochar and Solid Decanter Improve Selected Soil Chemical Properties and Leaf Nutrient Status of Oil Palm Seedlings under Reduced NPK Fertilization Sakiah; Siti F Batubara; Febriana Roosmawati; Saroha Manurung; Rahmad Dian; Sigi Ardika; Adiani Y Siahaan; Riki Pradana; Bolkiah Habibie
Journal of Smart Agriculture and Environmental Technology Vol. 4 No. 2 (2026): August 2026
Publisher : Indonesian Soil Science Society of South Sumatra in Collaboration With Soil Science Department, Sriwijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.60105/josaet.2026.4.2.57-66

Abstract

Oil palm seedling growth in acid mineral soils is often constrained by low soil fertility and limited nutrient retention, making organic amendments a potential strategy to improve growing media quality while reducing mineral fertilizer input. This study evaluated the effects of biochar and solid decanter, applied individually or in combination, on soil chemical properties and leaf nutrient status of oil palm seedlings under reduced  compound mineral fertilizer rates. The experiment was arranged in a non-factorial randomized block design with seven treatments and four replications. The treatments were P0: without soil amendment + 100% NPK fertilizer; P1: 0.6 kg plant−1 solid decanter + 75% NPK fertilizer; P2: 0.6 kg plant−1 solid decanter + 50% NPK fertilizer; P3: 1.5 kg plant−1 biochar + 75% NPK fertilizer; P4: 1.5 kg plant−1 biochar + 50% NPK fertilizer; P5: 0.6 kg plant−1 solid decanter + 1.5 kg plant−1 biochar + 75% NPK fertilizer; and P6: 0.6 kg plant−1 solid decanter +1.5 kg plant−1 biochar + 50% NPK fertilizer. After 14 weeks of treatment application, the treatment packages significantly affected soil organic carbon, total soil nitrogen, leaf phosphorus concentration, and soil exchangeable potassium. Soil organic carbon increased from 1.33% in the control to 5.83% in the combined biochar and solid decanter treatment with 50% NPK fertilizer. Total soil nitrogen also increased from 0.13% to 0.49% under the same treatment. However, soil pH, soil available phosphorus, leaf nitrogen, and leaf potassium were not significantly affected. These findings indicate that the integrated amendment-fertilizer packages, particularly the combination of biochar + solid decanter + 50% NPK fertilizer, improved soil organic carbon and total soil nitrogen and supported selected nutrient parameters, including leaf phosphorus concentration and soil exchangeable potassium, under a 25% to 50% reduction in the recommended NPK fertilizer rate.
Co-Authors Ade Firmansyah Adiani Y Siahaan Adri Moses Manullang Ahmad Dhairobi Aisar Novita Alvin Cristi Sitepu Anggraeni, Trisna Anggraini, Mutia Dwi Aremi Evanta Br Tarigan Arfansyah, Didik Ariantono, Joko Yulianto Arief Setiawan Sutanto Aries Sukariawan Aries Sukariawan Baniray, Azra Al Batubara, Siti Fatimah Bayu Pratomo Bayu Pratomo Bolkiah Habibie Clario, Steven Rizki Dewi Fitriana Dina Arfianti Dina Arfianti Saragih Eka Bobby Febrianto, Eka Bobby Erpands Abdi Lestari Siahaan Febriana Roosmawati Guntoro Hari Gunawan Hasan Wirayuda Ingrid Ovie Yosephine Ingrid SITOMPUL Ismi Aryati Josua Dani Silalahi Kusuma, Satria E Kusuma Manurung, Hariani Mariani sembiring Mubarak, Raihan Zaki Muhammad Hanafi Muhammad Hanafi Muhammad Yusuf Dibisono Novita Sari O Y sitompul, Inggrid Priyo Adi Nugroho Putri, Tiara Cahya Rafi Irmawan Rahmad Dian Rahutomo, Suroso Raju Setiawan Damanik Ramedo Lumban Gaol Reza Ikbal Irawan Riki Pradana Rina Maharany Rio Pangestu Sinaga Safar Hidayat Saroha Manurung Sigi Ardika Siregar, Albert Kristian Siti F Batubara Sitorus, Tiurma Rotua Sudrajat, Ayi Susanti Susanti Susanti Susanti Tambunan, Aulimizan Alfikri Tosuko Utomo Tuty Ningsih Tuzzahra, Yustika Raudya Wikka Sasvita Windy WS Manullang