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All Journal Jurnal Ilmu Pertanian Indonesia Jurnal Hortikultura Indonesia Jurnal Ilmu Tanah dan Lingkungan (Journal of Soil Science and Environment) Journal of Tropical Soils Journal of Degraded and Mining Lands Management AGRIVITA, Journal of Agricultural Science Jurnal Pengelolaan Sumberdaya Alam dan Lingkungan (Journal of Natural Resources and Environmental Management) SAINS TANAH - Journal of Soil Science and Agroclimatology Jurnal Tanah dan Iklim
Hartono, Arif
Departemen Ilmu Tanah dan Sumberdaya Lahan, Fakultas Pertanian, IPB, Jalan Meranti, Kampus IPB Darmaga 16680
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Earth & Planetary Sciences Education Environmental Science

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Hubungan Karbon Organik Terlarut dengan Sifat Tanah pada Toposekuen di Taman Nasional Bukit Duabelas: The Relationship of Dissolved Organic Carbon with Soil Properties on Toposequence in the Bukit Duabelas National Park Syamsul Arifin; Arief Hartono; Kukuh Murtilaksono; Syaiful Anwar; Sunarti Sunarti; Yakov Kuztakov
Jurnal Ilmu Tanah dan Lingkungan Vol 19 No 2 (2017): Jurnal Ilmu Tanah dan Lingkungan
Publisher : Departemen Ilmu Tanah dan Sumberdaya Lahan, Fakultas Pertanian, IPB University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (807.191 KB) | DOI: 10.29244/jitl.19.2.51-59

Abstract

The organic matter in the forest ecosystem that contributes to the organic horizon of soil profile decomposes to CO2. The DOC (dissolved organic carbon) leached to the mineral soil horizons could be decomposed, leached or adsorbed onto mineral surfaces. The effect of soil properties on the DOC dynamic has not been fully understood because of limited data. The objective of this research was to characterize the DOC in Bukit Duabelas National Park and reveal the effect of soil profile position in toposequence and soil properties to the DOC. Six soil profiles were made with different positions in toposequence (two soil profiles on each upper, middle, and lower slope). Lysimeters were installed horizontally (in AO, AB and B horizons and in each soil profile) and connected to a bottle collector that placed on the bottom of the soil profile. The soil samples were collected from each of the soil profiles, at the beginning of the research, while soil solutions were collected periodically. The results showed that the independent sample t-test revealed that fluxes of DOC of soil profile on the lower slope were different from that of soil profiles on the upper and middle slopes. The concentration, amount, and fluxes of DOC in soil profile on the lower slope were higher than those of soil profiles on the upper and the middle slopes. The independent sample t-test also revealed that fluxes of DOC of AO horizons were different from those of AB and B horizons. The concentration, amount, and fluxes of DOC of AO horizon were higher than those of AB and B horizons. The result of Pearson correlation showed positive correlations between DOC fluxes with organic-C, total-N, and Cation Exchange Capacity (CEC), but negative correlation with soil bulk density, pH, and Fe dithionite-citrate-bicarbonate (Fed) content. The results suggested that soil profile on the lower slopes on toposequence had a higher amount of DOC than that on other soil profiles above it. Horizon AO had a higher amount of DOC than that of AB and B horizons. The increase of organic-C, total N and CEC increased DOC. On the other hand the increase of soil bulk density, pH and Fed decreased DOC. Keywords: DOC, horizon, soil organic matter, toposequence
PHOSPHORUS SORPTION KINETIC ON ACID UPLAND SMECTITIC SOIL AMENDED WITH CALCIUM CARBONATE AND CALCIUM SILICATE Arief Hartono
Jurnal Ilmu Tanah dan Lingkungan Vol 11 No 2 (2009): Jurnal Ilmu Tanah dan Lingkungan
Publisher : Departemen Ilmu Tanah dan Sumberdaya Lahan, Fakultas Pertanian, IPB University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (351.636 KB) | DOI: 10.29244/jitl.11.2.58-62

Abstract

Acid upland smectitic soil is identified by high amount of exchangeable Al due to the weathering of aluminum (Al) octahedral layer by H+ saturation and by very low phosphorus (P) status.  Calcium carbonate (CaCO3) and calcium silicate (CaSiO3) were commonly used to decrease exchangeable Al and increase soil pH.  Laboratory experiments were conducted with clayey smectitic Typic Paleudults from Gajrug region, West Java.  The CaCO3 and CaSiO3 were added at rates to replace 0, 1.5 or 3 times of exchangeable Al. After one month of incubation, P sorption kinetic experiments were conducted.   The changes in some chemical properties after one month incubation showed that both CaCO3 and CaSiO3 increased the soil pH, exchangeable Ca, and base saturation  but did not increase the cation exchange capacity.  The results of the experiment showed that both CaCO3 and CaSiO3 decreased the rate constant value of first order kinetic equation (k) and the P sorbed maximum (a) at given amount of added P compared to Control.The CaCO3 was better than CaSiO3 in decreasing k values and on the contrary for a values. The decrease in P maximum sorption and the rate constant of the soil amended with CaSiO3 and CaCO3 due to occupation of P sorption sites by silicates and hydroxyl ions. The CaCO3with the rate to replace 1.5 x exchangeable Al was recommended to decrease the rate constant of P sorption. However, the CaSiO3 at the rate to replace 3 x exchangeable Al was recommended to decrease the maximum P sorption.
Karakterisasi Pelepasan Nitrat pada Andisol di Jawa Barat dan Jawa Tengah: Characterization of Nitrate Release on Andisols in West and Central Java Arief Hartono; Syaiful Anwar; Novianti Ruliana
Jurnal Ilmu Tanah dan Lingkungan Vol 21 No 1 (2019): Jurnal Ilmu Tanah dan Lingkungan
Publisher : Departemen Ilmu Tanah dan Sumberdaya Lahan, Fakultas Pertanian, IPB University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (146.169 KB) | DOI: 10.29244/jitl.21.1.16-20

Abstract

Andisol tersebar luas di Indonesia dengan luas total mencapai 5.4 juta ha. Tanah-tanah ini digunakan secara luas oleh petani sebagian besar untuk pertanian hortikultura dan perkebunan teh, dan sebagian kecil untuk peternakan. Karakteristik pola pelepasan anion nitrat sangat spesifik lokasi sehingga perlu diteliti lebih jauh sifat-sifat kimia tanah apa saja yang berpengaruh terhadap pola pelepasan nitrat pada Andisol di Jawa Barat dan Jawa Tengah. Tujuan dari penelitian ini adalah: (i) mengkarakterisasi sifat kimia Andisol, (ii) mengkarakterisasi pola pelepasan nitrat pada Andisol dengan sifat kimia yang berbeda, (iii) mendapatkan hubungan antara sifat-sifat kimia tanah dengan pola pelepasan nitrat pada Andisol di Jawa Barat dan Jawa Tengah. Percobaan pelepasan nitrat dilakukan dengan metode inkubasi. Jumlah nitrat yang terlepaskan dalam penelitian ini disimulasikan dengan menggunakan persamaan first order kinetic. Berdasarkan hasil analisis, sifat-sifat kimia tanah Andisol di Jawa Barat dan Jawa Tengah bervariasi. Pelepasan nitrat pada Andisol Lembang, Pangalengan, Sukamantri, dan Dieng secara umum semakin menurun dengan meningkatnya kedalaman tanah pada satu profil tanah dan semakin meningkat dengan meningkatnya waktu inkubasi. Hasil uji korelasi sederhana menunjukkan bahwa untuk nitrat maksimum yang dapat dilepaskan (N0) memiliki korelasi yang tidak nyata dengan sifat-sifat kimia tanah yang dianalisis. Hal ini menunjukkan bahwa nitrat sangat mobil di dalam tanah. Walaupun demikian N0 berkorelasi positif dengan C organik, N total, Fe-oksalat (Feo), Al-dithionite dan Fe-dithionite. Sebaliknya N0 berkorelasi negatif dengan Al-oksalat (Alo), dan Alo + ½ Feo. Untuk konstanta kecepatan pelepasan nitrat (k) berkorelasi negatif dengan semua sifat tanah tersebut kecuali dengan dengan Fe-dithionite yang mempunyai korelasi positif. Hasil ini menyimpulkan bahwa pelepasan nitrat pada Andisol punya kemungkinan meningkat dengan meningkatnya kadar C organik dan N total tanah akan tetapi menurun dengan meningkatnya Alo + ½ Feo. Alo + ½ Feo juga mempunyai kemungkinan menurunkan kecepatan pelepasan nitrat pada Andisol.
Perubahan Sifat Kimia dan Pola Pelepasan Amonium dan Nitrat pada Ultisol Darmaga yang Diberi Pupuk Pelet Berbahan Dasar Lumpur Kolam Ikan: Chemical Properties Changes and Releasing Pattern of Ammonium and Nitrate on Ultisol Darmaga Fertilized by Fishpond Sediment-Based Pellet Fertilizer Arief Hartono; Lilik Tri Indriyati; Putri Tria Santari; Neng Elin Novianti
Jurnal Ilmu Tanah dan Lingkungan Vol 21 No 2 (2019): Jurnal Ilmu Tanah dan Lingkungan
Publisher : Departemen Ilmu Tanah dan Sumberdaya Lahan, Fakultas Pertanian, IPB University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (663.3 KB) | DOI: 10.29244/jitl.21.2.78-86

Abstract

Fishpond sediment-based pellet fertilizer enriched with fishpond water and goat manure was made to decrease load of nitrate contamination in water bodies. The objective of this research was to evaluate the changes of some soil chemical properties and the releasing pattern of nitrogen (N)-ammonium (N-NH4+) and N-nitrate (N-NO3-) in Ultisol Darmaga which was fertilized by pellet fertilizer. The rate of pellet fertilizer which was applied to the soil was 6.10 g of pellets/300 g of soil or equivalent to 40.8 ton of pellets ha-1. This rate was based on the amount of N fertilizer for sweet corn that was 200 kg N ha-1. The pots were incubated in 1 week, 2 weeks, 3 weeks, 4 weeks, 5 weeks, 6 weeks, 7 weeks, 8 weeks, 10 weeks, and 15 weeks at field capacity condition. Soil analyses were conducted after the end of each incubation period. The results showed that in the end of incubation period, the application of pellet fertilizer increased soil pH, organic carbon, cation exchange capacity, exchangeable bases, N-NH4+, and N-NO3- and total available N which is the total amount of N-NH4+, and N-NO3- compared to those of control soil. As for the releasing pattern of N-NH4+ and N-NO3-, in the 1 week to 7 weeks of incubation N-NH4+ was dominant and decreased after that. The decrease of N-NH4+ was followed by the increase of N-NO3-. The N-NO3- was dominant from 8 weeks to 15 weeks of incubation. The results recommended that fishpond sediment-based pellet fertilizer improved the soil properties and provided available N.
Distribusi Sifat Kimia Gambut di Perkebunan Sawit dan Hubungannya dengan Kedalaman Lapisan Gambut dan Jarak dari Tanah Mineral Berbahan Induk Batuan Ultrabasa: Selected Chemical Peat Properties Distribution in Palm Oil Plantation and Its Relationship with Depth Layer and Distance from Mineral Soil Derived From Ultrabasic Rocks Heru Bagus Pulunggono; Moh. Zulfajrin; Arief Hartono
Jurnal Ilmu Tanah dan Lingkungan Vol 22 No 1 (2020): Jurnal Ilmu Tanah dan Lingkungan
Publisher : Departemen Ilmu Tanah dan Sumberdaya Lahan, Fakultas Pertanian, IPB University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29244/jitl.22.1.22-28

Abstract

Lahan gambut di lokasi penelitian yang digunakan untuk perkebunan sawit berdampingan dengan tanah mineral berbahan induk ultrabasa berkadar Mg tinggi. Tanah berkadar Mg tinggi dapat mengakibatkan terhambatnya pertumbuhan tanaman dan gangguan serapan hara. Penelitian ini bertujuan mempelajari distribusi beberapa sifat kimia tanah seperti pH; kandungan unsur kalium (K), kalsium (Ca), magnesium (Mg), natrium (Na) dapat ditukar; besi (Fe), mangan (Mn), tembaga (Cu), seng (Zn) total dan terekstrak DTPA dalam gambut dan hubungannya dengan kedalaman lapisan gambut dan jarak terhadap tanah mineral berbahan induk batuan ultrabasa. Contoh gambut sekitar 1,0 kg diambil secara komposit dari setiap kedalaman gambut 0 – 30, 30 – 60 dan 60 – 90 cm pada transek toposekuen dari setiap jarak 100, 200, 300, 400, 500 dan 600 m dari perbatasan tanah mineral ultrabasa. Analisis contoh gambut dilakukan untuk menetapkan (i) kapasitas tukar kation (KTK) dan pH H2O 1:5; (ii) kandungan hara makro K, Ca, Mg dan benefisial Na menggunakan amonium asetat 1 N pH 7; dan (iii) kandungan total unsur mikro Fe, Cu, Zn, Mn serta kandungan unsur-unsur tersebut dengan pengekstrak DTPA. Hasil penelitian menunjukkan nilai pH gambut menurun sangat nyata berdasarkan kedalaman lapisan gambut dan cenderung menurun dengan semakin jauh dari tanah mineral. Nilai KTK berfluktuasi dan cenderung meningkat sesuai peningkatan kedalaman lapisan gambut dan jarak dari tanah mineral. Berdasarkan hasil pengukuran Mg dan Fe, hara yang berasal dari tanah mineral mempengaruhi gambut hingga jarak 600 m dari batas gambut. Tanah gambut mengandung Mg, Na, Fe, Mn, dan Zn tersedia dalam kadar tinggi dan K and Ca tersedia dalam kadar rendah. Hara Cu tersedia tergolong cukup pada semua kedalaman dan jarak kecuali kedalaman 60 – 90 cm dan jarak 600 meter. Kandungan hara benefisial Na menunjukkan korelasi positif dengan kedalaman lapisan gambut yang mengindikasikan pengaruh marin pada tanah mineral bawah gambut. Disparitas yang besar antara Mg dengan kation lain dapat mengganggu penyerapan hara oleh akar tanaman dan memungkinkan pencucian K dan Ca keluar dari solum.
Karakteristik Erapan Nitrat pada Andisol: Characteristics of Nitrate Sorption of Andisols Arief Hartono; Syaiful Anwar; Masruroh
Jurnal Ilmu Tanah dan Lingkungan Vol 23 No 1 (2021): Jurnal Ilmu Tanah dan Lingkungan
Publisher : Departemen Ilmu Tanah dan Sumberdaya Lahan, Fakultas Pertanian, IPB University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29244/jitl.23.1.1-6

Abstract

Penggunaan pupuk urea dan pupuk kandang yang berlebihan oleh petani menyebabkan terjadinya akumulasi ion nitrat pada tanah pertanian. Pengetahuan tentang kemampuan tanah dalam mengerap nitrat menjadi sangat penting dalam kaitan pergerakan nitrat di dalam profil tanah. Tujuan penelitian ini adalah karakterisasi tanah-tanah pertanian yang mempunyai order Andisol di Pulau Jawa dalam mengerap nitrat dan mengidentifikasi sifat-sifat tanah yang mempengaruhi erapan nitrat. Data erapan nitrat diperoleh dengan menjenuhkan tanah dengan larutan nitrat pada berbagai konsentrasi, setelah sebelumnya tanah dijenuhi dengan ion klorida. Nitrat dalam larutan supernatan ditetapkan menggunakan UV Spectrophotometer dengan panjang gelombang 210 nm dan 275 nm. Kemudian, data dianalisis menggunakan dua persamaan yaitu, persamaan Langmuir dan persamaan Freundlich. Hasil menunjukkan bahwa erapan nitrat dapat disimulasikan paling baik oleh persamaan Freundlich. Nilai konstanta K persamaan Freundlich yang merupakan indeks erapan maksimum berkorelasi positif dengan karbon (C) organik, aluminium yang diekstrak dengan amonium oksalat (Alo), aluminium yang diekstrak dengan dithionite-citrate-bicarbonate (Ald) dan Alo+1/2Feo (sifat Andik). Penelitian ini merekomendasikan bahwa C organik, Alo, Ald dan sifat Andik mengontrol erapan nitrat.
Dinamika Pelepasan Nitrogen Empat Jenis Pupuk Urea Pada Kondisi Tanah Tergenang: Dynamics of Nitrogen Release by Four Types of Urea in Flooded Conditions Arief Hartono; Budi Nugroho; Desi Nadalia; Afifah Ramadhani
Jurnal Ilmu Tanah dan Lingkungan Vol 23 No 2 (2021): Jurnal Ilmu Tanah dan Lingkungan
Publisher : Departemen Ilmu Tanah dan Sumberdaya Lahan, Fakultas Pertanian, IPB University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29244/jitl.23.2.66-71

Abstract

Pupuk urea merupakan sumber hara nitrogen (N) yang paling banyak digunakan di Indonesia, termasuk pada lahan sawah. Urea merupakan pupuk N yang larut air sehingga penggunaan urea di sawah perlu dikaji dalam hubungannya dengan pelepasan pupuk. Di dalam penelitian ini digunakan urea dengan formulasi berbeda yaitu pupuk urea Kujang dan Pupuk Sriwijaya (Pusri) yang merupakan urea konvensional dan urea prill dan granul yang merupakan urea modifikasi yang mengandung formaldehida masing-masing 0.10 dan 0.50%. Tujuan penelitian ini adalah untuk mengevaluasi pelepasan N dari tipe urea konvensional dan urea yang diberi formaldehida pada kondisi tanah tergenang. Metode penelitian yang digunakan adalah inkubasi dan pencucian. Inkubasi dilakukan selama 7, 14, 28, 45, 60, dan 90 hari serta dilakukan pencucian pada setiap akhir masa inkubasi. Hasil pencucian ditetapkan kandungan amonium dan nitrat. Hasil penelitian menunjukkan bahwa pelepasan N dalam bentuk amonium dan nitrat antar perlakuan pupuk urea tidak berbeda nyata. Hasil total N tercuci menunjukkan nilai paling tinggi diperoleh oleh urea granul sebesar 78.0 mg tabung-1, kemudian disusul oleh urea prill 75.2 mg tabung-1, urea kujang sebesar 71.5 mg tabung-1, dan urea pusri sebesar 68.4 mg tabung-1. Berdasarkan hasil persamaan first order kinetic, diperoleh nilai pelepasan maksimum dan konstanta kecepatan. Nilai pelepasan maksimum tertinggi dimiliki oleh urea granul sebesar 94.6 mg tabung-1, kemudian urea prill sebesar 88.3 mg tabung-1, urea Pusri sebesar 82.3 mg tabung-1, dan urea Kujang sebesar 79.2 mg tabung-1. Sementara untuk nilai konstanta kecepatan, konstanta kecepatan tertinggi diperoleh pada urea kujang sebesar 0.0349 hari-1, kemudian dilanjutkan oleh urea prill dan pusri sebesar 0.0256 hari-1, dan urea granul sebesar 0.0253 hari-1. Hasil penelitian menunjukkan bahwa urea yang diperlakukan dengan formaldehida terutama dalam bentuk granul cenderung memiliki kemampuan untuk memperlambat proses pelepasan N yang ditunjukkan dengan nilai konstanta kecepatan pelepasan N yang paling rendah.
Aluminium Dapat Dipertukarkan dan Fosfor Tersedia pada Tanah di Provinsi Bangka Belitung: Exchangeable aluminum and available phosphorus in the soils of Bangka Belitung Province Arief Hartono; Desi Nadalia; Praja Hary Satria
Jurnal Ilmu Tanah dan Lingkungan Vol 24 No 1 (2022): Jurnal Ilmu Tanah dan Lingkungan
Publisher : Departemen Ilmu Tanah dan Sumberdaya Lahan, Fakultas Pertanian, IPB University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29244/jitl.24.1.20-24

Abstract

Productivity of pepper in Bangka Belitung Province has decreased because one of the causes is the problem of the low nutrient availability. The research was conducted in Bangka Belitung Province to determine the distribution of pH, exchangeable aluminium (Exch Al), and available phosphorus (P) and the correlation among those parameters. Soil samples at depths of 0-30 cm and 30-60 cm were collected at the specified points on a 1: 250,000 scale land system map. The pH was determined by shaking the soil sample with distilled water and the ratio of soil sample and distilled water was 1:5. Exch Al was extracted using 1.00 mol L-1 KCl and determined by titration. Available P was determined using the Bray 1 method. Basic statistic analyses to have minimum, maximum, average and standar deviation (SD) values were conducted. Correlation test among pH, exch Al, and available P to evaluate their relationship were also conducted. The results showed that soils in Bangka Belitung were relatively acid, relatively high exch Al especially in the depth of 0-30 cm and relatively low available P as Bray 1-P. Bray 1-P and exch Al on the depth of 0-30 cm had higher SD than that of the other paramaters. As for correlation analyses, pH significantly negatively correlated with exch Al. pH and exch Al did not correlate with Bray 1-P. This research suggested that soil in Bangka Belitung had problem with soil acidity and low amount of available P in the form of Bray 1-P. The amount of Bray 1-P did not correlate with the amount of exch Al.
Multi-criteria decision making for determining landfill location in Malaka Regency, East Nusa Tenggara Province of Indonesia Leonarda Sofiani Rame; Widiatmaka Widiatmaka; Arief Hartono; Irman Firmansyah
Journal of Degraded and Mining Lands Management Vol 9, No 2 (2022)
Publisher : Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15243/jdmlm.2022.092.3405

Abstract

The absence of a landfill has increased the illegal waste disposal sites in Malaka Regency, which was established between 2013 and 2021. Therefore, this study aimed to analyze suitable and available land for the development of a landfill. The methodology used consisted of 2 analysis steps, namely land suitability and land availability. Land suitability was analyzed using a multi-criteria decision-making method, which included the slope, stone type/geology, lithology, soil type, soil texture, soil depth, soil drainage, distance from settlements, and water sources. The criteria were then weighted using the Analytical Hierarchy Process (AHP) and geographic information system for overlaying. Furthermore, the results of the land suitability analysis were used to determine its availability with the aid of spatial and regional planning (RTRW), land use, and forest area maps. The results showed that the highly suitable (S1) and available terrain for the landfill in Malaka Regency covered an area of 203.37 ha or 1.73% of the regency. Also, the analysis results indicated that there was still adequate land available for the landfill.
Releasing Pattern of Applied Phosphorus and Distribution Change of Phosphorus fractions in the Acid Upland Soils with Successive Resin Extraction Arief Hartono
JOURNAL OF TROPICAL SOILS Vol 13, No 2: May 2008
Publisher : UNIVERSITY OF LAMPUNG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5400/jts.2008.v13i2.87-94

Abstract

The releasing pattern of applied P  in the acid upland soils and the soil properties influencing the pattern were studied.  Surface horizons of six acid upland soils from Sumatra, Java and Kalimantan were used in this study.  The releasing pattern of applied P (300 mg P kg-1) of these soils were studied by successive resin extraction. P fractionation was conducted to evaluate which fractions released P to the soil solution after successive resin extraction.  The cumulative of resin-Pinorganic (Pi) release of soils was fitted to the first order kinetic. Regression analyses using factor scores obtained from the previous principal components analyses was applied to determine soil properties influencing P releasing pattern. The results suggested that the maximum P release was significantly (P < 0.05) increased by acidity plus 1.4 nm mineral-related factor (PC2) i.e. exchangeable Al and 1.4 nm minerals (smectite and vermiculite) and decreased by oxide related factor (PC1) i.e. aluminum (Al) plus 1/2 iron (Fe) (by ammonium oxalate), crystalline Al and Fe oxides, cation exchange capacity, and clay content.  P fractionation analysis after successive resin extraction showed that both labile and less labile in the form of NaHCO3-Pi and NaOH-Pi fractions, respectively, can be transformed into resin-Pi when in the most labile resin-Pi is depleted.  Most of P released in high oxides soils were from NaOH-Pi fraction while in low oxides soils were from NaHCO3-Pi.  P release from the former fraction resulted in the maximum P release lower than that of the latter one. When NaHCO3-Pi was high, NaOH-Pi was relatively more stable than NaHCO3-Pi despite resin-Pi removal. NaHCO3-Pi and NaOH-Pi are very important P fractions in replenishing resin-Pi in these acid upland soils.
Co-Authors A Moawad A Rachim Achmad Surya Adi Sustama Afifah Ramadhani Anas D. Susila Anas Dinurohman Susila Atang Sutandi Baba Barus Budi Nugroho Dede Sulaeman Denis Muba Pandapotan Simanihuruk Desi Nadalia Diah Tjahyandari Faridlotul Hasanah Gilang Sukma Putra Gilang Sukma Putra Hafiz Hernandi Heru Bagus Pulunggono I Gusti Bagus Wiksuana Indri Hapsari Fitriyani Irman Firmansyah Kukuh Murtilaksono Kukuh Murtilaksono Kukuh Murtilaksono Laode Muhamad Asdiq Hamsin Ramadhan Leonarda Sofiani Rame Lilik Tri Indriyati, Lilik Tri Masruroh Mimin Aminah Moh. Zulfajrin Muhammad Firdaus Muliana Mutia Oktarina Permai Yenny Natalia Desy Djata Ndua Neng Elin Novianti Novianti Ruliana P.L.G. Vlek Praja Hary Satria Purwono Purwono Putri Tria Santari Putri Tria Santari Setiko, Putro Hairutomo Siti Lathifah Husnul Khuluq Sri Djuniwati Sudadi, Untung Sunarti Sunarti Sunarti Sunarti Supiandi Sabiham Susanto, Bambang Suwarno, Suwarno Syaiful Anwar Syamsul Arifin Widiatmaka . Yakov Kuztakov Yakov Kuzyakov Yumei Kang