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PENGARUH EKSTRAK KOMPOS LIMBAH BUAH KAKAO DAN PEMUPUKAN P TERHADAP AL MONOMERIK DALAM TANAH DAN SERAPAN P OLEH JAGUNG PADA OXIC DYSTRUDEPT Rezi Amelia
Agroland: Jurnal Ilmu-ilmu Pertanian Vol 20, No 2 (2013)
Publisher : Universitas Tadulako

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Abstract

The study was conducted to determine the effect of extract of cacao fruit waste compost at various levels of P fertilizer application on monomeric Al in the soil and acidity characteristics of Palolo Oxic Dystrudepts. In addition, this study was aimed to determine the effect of extract of cacao fruit waste compost at various levels of P fertilizer application on P uptake, P fertilization efficiency and maize growth in the Oxic Dystrudepts. The experiment was carried out in two phases. Phase I wasa soil experiment without plant, while in phase II, the experiment was conducted in a greenhouse using maize as an indicator plant. The experimental design used wasatwo-factorial randomized complete design, where the first factor was rate of cacao fruit waste compost extract produced from 8-day fermentation process(D) consisting of D0 = 0ℓ.ha-1 (control), D1 = 500ℓ.ha-1, D2 = 1000ℓ.ha-1, and D3 = 2000ℓ.ha-1. The second factor was rate of SP-27 (P) fertilizer consisting of P0 = 0 kg.ha-1, P1 = 50 kg.ha-1, P2 = 100 kg.ha-1, and P3 = 200 kg.ha-1. Each treatment was replicated three times, hence, there were 4 x 4 x 3 = 48 experimental plots. The results showed that increasing rates of cacao fruit waste compost extract application at all rates of P fertilizer significantly decreased monomeric Alconcentration in the soil solution, and thismonomeric Al concentration also decreased with increasing rates of P fertilizer at all rates of cacao fruit waste compost extract application. The application of compost extract at2000ℓha-1 combined with P fertilizer at200 kgha-1represented the best combination since it decreased the concentration of monomeric Al in the soil solution from 650.8μM to 339.7μM. The results alsoshowed that application of cacao fruit waste compost extract with increasing rates significantly decreased soil exchangeable Al and  increased soil pH, P uptake efficiency of maize, soil available P, soil organic C level, soil CEC, plant dry weight, and P concentration and uptake of maize. In the experiment with maize as an indicator plant, P concentration and P uptake in maize tissue also increased with increasing in P fertilizerrate. Application of P fertilizer at the rate of 200 kg Pha-1 produced the highest P concentration (0.50%) and P uptake (238.61 mg P plant-1) in the plant at 38 days after planting (DAP). P uptake efficiency increased with increasing rates of cacao fruit waste compost extract, while the efficiency of P uptake decreased with increasing rates of P fertilizer application. Key Words : Cacao fruit waste, compost extract, monomericAl, Oxic Dystrudepts, and P fertilizer.
IDENTIFIKASI BAKTERI ASAL RIZOSFER PADI GOGO (Oryza sativa L.) DI DESA AMPERA KECAMATAN PALOLO KABUPATEN SIGI Wahyudi, Rifal; Thaha, Abdul Rahim; Rezi Amelia
AGROTEKBIS : JURNAL ILMU PERTANIAN (e-journal) Vol 14 No 1 (2026): Februari
Publisher : Fakultas Pertanian, Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/rn394415

Abstract

Bakteri adalah organisme prokariotik bersel tunggal dengan jumlah kelompok paling banyak dijumpai di tiap ekosistem. Terdapat tiga bentuk dari bakteri, yaitu: basil (batang), kokus (bulat) dan spirila (spiral). Beberapa spesies bakteri yang berasal dari akar dan tanah tanaman mempunyai kemampuan sebagai insektisida, fungisida, pupuk hayati, dan merangsang pertumbuhan tanaman. Tujuan dari penelitian ini adalah untuk mengetahui beberpa karakteristik bakteri asal rizosfer yang terdapat pada tanaman padi gogo di Desa Ampera Kecamatan Palolo Kabupaten Sigi. Metode yang digunakan dalam penelitian ini adalah metode Deskriptif Eksploratif dengan teknik pengambilan sampel secara Purposive Sampling. Sampel tanah yang diambil berdasarkan pada lima galur padi gogo, sampel tanah yang digunakan yaitu tanah tidak utuh dengan kedalaman pengambilan sampel 0-20 cm. Pengambilan sampel tanah dilakukan di Desa Ampera Kecamatan Palolo, Kabupaten Sigi, kemudian analisis tanah dilaksanakan di Laboratorium Ilmu Tanah, dan Laboratorium Hama Penyakit Fakultas Pertanian, Universitas Tadulako, Palu. Penelitian ini dilaksanakan pada bulan Desember 2024 sampai Februari 2025. Hasil analisis pH H2O pada sampel tanah padi gogo Pulu Tau Leru, Delima, Pulut Bolobo, dan Bohe UT berada pada kisaran agak masam dan pada sampel tanah padi gogo Pare Pulu Bongo pada kisaran masam. Sedangkan analisis pH KCl pada sampel tanah padi gogo Pulu Tau Leru, Delima, Bohe UT berada pada kisaran masam, Pare Pulu Bongo sangat masam dan Pulut Bolobo agak masam. Berdasarkan hasil C-Organik pada kelima sampel tanah padi gogo memiliki kriteria sangat rendah. Beberapa faktor yang mempengaruhi pH dan C-Organik yaitu pada pengolahan tanah yang tidak tepat, ketersediaan bahan organik rendah, kadar air rendah, dan lain sebagainya. Jumlah keseluruhan isolat yang teridentifikasi sebanyak 1.538 isolat dan berdasarkan pengamatan dari ciri morfologinya yang didapatkan meliputi bentuk : Bulat halus, bulat bening, panjang seperti benang, lonjong, bulat bergerigi, dan bulat bertepi, warna : Putih susu, cream, kuning, dan abu-abu dengan pinggiran yang berwarna putih, Elevasi : Cembung dan datar, cekung, cembung cekung, dan cekung datar, ukuran koloni : Titik-titik kecil, sedang dan besar.