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INDONESIA
Jurnal Tanah dan Iklim
Published by Balai Besar Penelitian dan Pengembangan Sumberdaya lahan Pertanian
ISSN : 14107244     EISSN : 27227723     DOI : http://dx.doi.org/10.21082/jti.v44n1.2020.19-29
Core Subject : Agriculture,
Agriculture, Biological Sciences & Forestry
Jurnal TANAH dan IKLIM memuat hasil-hasil penelitian bidang tanah dan iklim dari para peneliti baik dari dalam maupun dari luar Balai Besar Litbang Sumberdaya Lahan Pertanian. Jurnal ini juga dapat memuat informasi singkat yang berisi tulisan mengenai teknik dan peralatan baru ataupun hasil sementara penelitian tanah dan iklim.
Arjuna Subject : Ilmu Pertanian dan Biologi (Semua) - Ilmu Pertanian dan Biologi (Lain-Lain)
Articles 257 Documents
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PENGEKSTRAK, STATUS DAN DOSIS PUPUK KALIUM UNTUK PADI GOGO PADA HAPLUDULTS, BRAJA SELEBAH, KABUPATEN LAMPUNG TIMUR ( STATUS AND DOSAGE OF POTASSIUM FERTILIZER FOR UPLAND RICE IN HAPLUDULTS, BRAJA SELEBAH, EAST LAMPUNG DISTRICT ) Kasno, Antonius; Suastika, I Wayan
Jurnal Tanah dan Iklim (Indonesian Soil and Climate Journal) Vol 41, No 1 (2017)
Publisher : Balai Besar Penelitian dan Pengembangan Sumberdaya Lahan Pertanian

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21082/jti.v41n1.2017.61-68

Abstract

Abstrak: Kalium merupakan hara makro primer dan menjadi faktor pembatas pertumbuhan pada lahan kering masam. Pengekstrak hara K terbaik, status hara K dan dosis pupuk K untuk padi gogo pada Hapludults belum banyak dipelajari. Penelitian bertujuan untuk mendapatkan pengekstrak hara K terbaik, status hara K dan dosis pupuk K untuk tanaman padi gogo yang ditanam pada tanah Hapludults dengan kandungan K sangat rendah. Penelitian dilakukan di Desa Braja Harjosari, Kecamatan Braja Selebah, Lampung Timur (05o 10? 57? LS, dan 105o 46? 33? BT), pada musim kering 2015 dan musim hujan 2015/2016. Pada musim pertama, status K buatan dibuat dengan menambah pupuk K dengan dosis 0 X, ¼ X, ½ X, ¾ X, dan 1 X, dimana X merupakan jumlah pupuk K untuk mencapai kadar K dalam tanah 0,6 cmol(+) kg-1. Pada musim kedua dibuat percobaan respon pemupukan pada setiap status hara K, dengan dosis 0, 20, 40, 80, dan 160 kg K ha-1. Pada musim pertama petak perlakuan berukuran 25 m x 6 m, dan musim kedua 5 m x 6 m. Pengamatan dilakukan terhadap sifat kimia tanah dan berat gabah kering. Pengesktrak K yang diuji adalah NH4OAc 1N pH 7, NH4OAc 1N pH 4,8, HCl 25%, Truog, Mehlich 1, Bray 1, Bray 2, Colwell, dan Morgan Venema. Hasil penelitian menunjukkan bahwa pengekstrak hara K terbaik tanah Hapludults adalah Colwell. Status hara K rendah, sedang dan tinggi adalah <21,5, 21,5 ? 26,5 dan >26,5 mg kg-1, dan dosis pupuk K untuk padi gogo pada masing-masing status hara K berturut-turut adalah 125, 110, dan 80 kg KCl ha-1.Abstract. Potassium is a primary macro nutrients and it becomes a limiting factor of plant growth in the upland acid soil. There have not been much studied about the best K extraction, K nutrient status, and the rate of K fertilizer application for upland rice in Hapludults. The objective of this research is to investigate the best extractant for K nutrient, evaluate K nutrient status and the best rate of K fertilizer for each K nutrient status for upland Hapludults with very low K content. The study was conducted in the village of Braja Harjosari, Sub district of Braja Selebah, East Lampung (05o 10 '57.43 "S and 105o 46' 33.27" E), in dry season of 2015 until the rainy season of 2015/2016. In the first season, a series of artificial K nutrient status from low to high was made by adding K fertilizer with doses of 0 X, ¼ X, ½ X, ¾ X, and 1 X, where X is the amount of K fertilizer intended to achieve the levels of 0.6 cmol(+)kg-1 K in the soil. In the second season, a fertilization response trial on each K nutrient status, with doses of 0, 20, 40, 80, and 160 kg K ha-1 was established Plots dimension was 25 m x 6 m in the first season and 5 m x 6 m in the second season. Observations were made on soil chemical properties and dry grain weight. The K extraction tested were 1N NH4OAc pH 7, 1N NH4OAc pH 4.8, 25% HCl, Truog, Mehlich 1, Bray 1, Bray 2, Colwell, Morgan Venema. The results showed that the best nutrient K extraction of Hapludults soil was the Colwell. The low, medium and high K nutrient status was <21.5, 21.5 ? 26.5 and > 26.5 mg kg-1, and the dosage of K fertilizer for upland rice in each nutrient status K was 125, 110, and 80 kg KCl ha-1. 
RELATIONSHIP BETWEEN SOIL CHARACTERISTICS AND RATE OF SOIL LOSS ON COFFEE BASE-FARMING SYSTEM AT SUMBERJAYA, WEST LAMPUNG DARIAH, AI; AGUS, F.; ARSYAD, S.; SUDARSONO, .; MASWAR, .
Jurnal Tanah dan Iklim (Indonesian Soil and Climate Journal) No 21 (2003): Desember 2003
Publisher : Balai Besar Penelitian dan Pengembangan Sumberdaya Lahan Pertanian

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21082/jti.v0n21.2003.%p

Abstract

The current public perception concerning land use change is, whenever forest is converted to agricultural land, the forest functions would drasticaly decrease. Studies have shown that soil loss in coffee based systems varied widely and it could be much lower than the tolerable soil loss level, depending on soil properties. This research was conducted to determine the dominant factors of soil properties in influencing soil loss. This analysis was based on data collected from a 3-site (Laksana, Tepus and Bodong Sub-Village of Sumberjaya Village, West Lampung) erosion study in 2001/2002. Observation of soil properties for each site was carried out by soil profile description and quantitative laboratory analyses for several soil physical properties and organic C content. Samples were collected from three soil depths namely 0-10, 10-20 and 20-40 cm. The resultsindicated that soil physical properties were dominant factors determining soil loss level in coffee-based farming system in Sumberjaya. The erosion on soil with mean total porosity of > 65%, macro pore of > 24%, and soil permeability of > 9 cm hr-1 was < 2 t ha-1 yr-1. Whereas erosion of soil with porosity of < 60%, macro pore of < 13%, and soil permeability of < 3 cm hr-1 was 37 t ha-1 for 3 months. These results suggested that soilconservation recommendation, particularly for Sumberjaya coffeebasedsystems, should not be imposed uniformly across sites. Site-specific soil property characterization and hence evaluation of soil susceptibility to erosion should precede recommendation and implementation emphasized only on erosion-prone sites.
VARIASI KARAKTERISTIK BIOFISIK LAHAN GAMBUT DENGAN BEBERAPA PENGGUNAAN LAHAN, DI SEMENANJUNG KAMPAR, PROVINSI RIAU Suratman, Suratman; Widiatmaka, Widiatmaka; Pramudya, Bambang; Purwanto, Muhammad Yanuar J.; Agus, Fahmuddin
Jurnal Tanah dan Iklim (Indonesian Soil and Climate Journal) Vol 43, No 2 (2019)
Publisher : Balai Besar Penelitian dan Pengembangan Sumberdaya Lahan Pertanian

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21082/jti.v43n2.2019.97-108

Abstract

Abstrak. Lahan gambut merupakan sumberdaya alam yang perlu dilindungi karena mempunyai pengaruh besar terhadap kelestarian sumberdaya alam yang telah menjadi permasalahan global. Lahan gambut juga mempunyai potensi ekonomis yang dalam pengelolaanya sering menimbulkan dampak perubahan terhadap berbagai karakteristik biofisik lahannya. Penelitian ini bertujuan untuk mengevaluasi dinamika karakteristik biofisik lahan akibat adanya perubahan penggunaan lahan di Semenanjung Kampar, Riau. Dinamika karakteristik lahan dilakukan melalui kompilasi data sekunder dari tahun 1990, dilengkapi data primer yang diamati di lapangan sampai tahun 2018. Untuk mengetahui dinamika tipe tutupan lahan dilakukan interpretasi citra dari tahun 1984 sampai 2018, dan ground check di lapangan. Hasil kajian menunjukkan bahwa dari tahun 1990 sampai 2018 terjadi penyusutan luas lahan gambut sebesar 2.054 ha (6,94%) dari luas semula 29.590 ha. Perubahan tutupan lahan berpengaruh terhadap dinamika karakteristik biofisik lahannya. Dari 1984 hingga 2016 seluruh hutan di areal penelitian telah habis kecuali hutan yang bercampur dengan semak belukar termasuk rumput rawa tinggal 990 ha (3,59%). Perubahan terutama menjadi areal perkebunan, hutan tanaman industri (HTI), kebun campuran, semak belukar dan pemukiman. Perubahan areal hutan menjadi perkebunan dan HTI dimulai tahun 1991 seluas 357 ha (1,3%). Saat ini luasnya 17.390 ha (63,15%). Dari tahun 2013 hingga 2018 telah terjadi perubahan karakteristik biofisik lahan. Nilai pH rata-rata meningkat, tertinggi tahun 2016 pada lahan tanaman pangan dan perkebuanan. Kadar C organik selama dua tahun terakhir terjadi penurunan, tertinggi pada semak belukar, rata-rata 4,29%, kemudian perkebunan, HTI, dan tanaman pangan, rata-rata 0,32 ? 3,52%. Kadar serat cenderung menurun dan kadar abu cenderung naik pada areal perkebunan, HTI, dan tanaman pangan. Kejenuhan basa rata-rata meningkat pada areal tanaman pangan, perkebunan dan HTI. Subsidensi selama 5 tahun terakhir antara 10 sampai 28 cm, terbesar pada tanaman karet dan terkecil pada areal HTI.Abstract. Peatland is a natural resource that need to be protected because it influences the sustainability of natural resources that has becomes a global problem. However, peatland also has economic potential, which in its management often results in changes to various aspects of the biophysical land characteristics. This research aimed at evaluating the dynamics of biophysical land characteristics due to land use changes in the Kampar Peninsula, Riau. The dynamics of the land characteristics was evaluated using secondary data compilation from 1990 and supplemented with primary field data in 2018. Land cover type was interpreted using multi temporal images from 1984 to 2018, ground check, and review of field information. The results of the study show that from 1990 to 2018 there was 2,054 ha (6.94%) reduction of peatlands area from the original area of 29,589 ha. The land use changes have lead to biophysical land characteristics changes. From 1984 to 2016 all of the forest areas have disappeared except for only 990 ha (3.59%) forests mixed with shrubs and swamp grass. Major changes were to plantations, industrial forest plantations (HTI), mixed gardens, shrubs, and settlement. The encroachment of 357 ha (1.30%) plantation and HTI into forest areas began in 1991. Currently there are 17,390 ha (63.15%) of these land covers. From 2013 to 2018 there have been changes in soil characteristics. Soil pH increased, the highest in 2016 on food crops and plantation areas. Organic C content decreased 4.29% in shrubs; and 0.32 ? 3.52% in plantations, HTI, and food crops; fiber content tended to decrease and ash content tended to increase in plantations, HTI, and food crop areas; base saturation increased in food crop, plantations and HTI areas. Subsidence in last 5 years was between 10 and 28 cm, the highest in rubber plantation and the smallest in HTI.
PENGARUH PERLAKUAN JERAMI DAN VARIETAS PADI INBRIDA TERHADAP EMISI GAS RUMAH KACA DI LAHAN SAWAH IRIGASI Sutrisna, Nana; Surdianto, Y.; Marbun, O.
Jurnal Tanah dan Iklim (Indonesian Soil and Climate Journal) Vol 40, No 2 (2016)
Publisher : Balai Besar Penelitian dan Pengembangan Sumberdaya Lahan Pertanian

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21082/jti.v40n2.2016.79-85

Abstract

AbstrakSistem budidaya padi yang intensif dapat meningkatkan produktivitas, namun juga dapat memberikan dampak negatif terhadap peningkatan emisi Gas Rumah Kaca (GRK) ti troposfer dalam bentuk gas metan (CH4) dan dinitrogen oksida (N2O). Indonesia adalah penyumbang emisi gas rumah kaca urutan ke-18 dunia. Atas dasar itu, pemerintah Republik Indonesia berkomitmen menurunkan emisi GRK sebesar 26% sampai tahun 2020. Tujuan penelitian adalah mengetahui pengaruh perlakuan jerami padi pada beberapa varietas unggul baru terhadap penurunan GRK. Penelitian mengunakan rancangan petak terpisah (split plot design).  Petak utama adalah VUB, terdiri atas (1) Inpari 4 (V1), (2) Inpari 14 (V2), dan (3) Mekongga (V3). Anak petak adalah teknik pemanfaatan jerami terdiri atas: (1) jerami dikomposan (J1), (2) jerami digelebeg (J2), dan (3) tanpa jerami (J0). Jumlah ulangan sebanyak 5. Data yang dikumpulkan terdiri atas: emisi GRK (CH4 dan N2O), pertumbuhan padi, komponen hasil, dan hasil padi. Data yang dikumpulkan kemudian dianalisis statistik dengan analisis keragaman (Analysis of Varians) yang dilanjutkan dengan uji nilai tengah Duncan pada taraf 5%. Hasil penelitian menunjukkan bahwa tidak terjadi interaksi antara varietas dan perlakuan jerami padi terhadap emisi CH4 baik pada umur 21, 42, dan 87 hst. Pada umur 42 hst perlakuan jerami padi berpengaruh nyata terhadap emisi CH4. Pada umur 87 hst varietas dan perlakuan jerami masing-masing berpengaruh nyata terhadap emisi CH4. Pada umur 110 hst justru varietas berpengaruh nyata terhadap emisi CH4. Terjadi interaksi antara varietas dan perlakuan jerami padi terhadap emisi gas N2O pada umur 21 hst.
MAMPUKAH PENETRALISIR TANAH MENINGKATKAN KESUBURAN TANAH DAN PRODUKTIVITAS TANAMAN KEDELAI? Kasno, A.; Rochayati, Sri
Jurnal Tanah dan Iklim (Indonesian Soil and Climate Journal) Vol 37, No 2 (2013)
Publisher : Balai Besar Penelitian dan Pengembangan Sumberdaya Lahan Pertanian

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21082/jti.v37n2.2013.129-138

Abstract

Abstrak. Tanaman kedelai (Glicine max (L.) Merr.) berkembang pada tanah masam dengan kejenuhan basa < 50%, kandungan hara, C-organik dan kapasitas tukar kation rendah. Peningkatan produktivitasnya memerlukan bahan pembaik tanah. Penetralisir tanah merupakan salah bahan yang dianggap dapat digunakan sebagai bahan pembaik tanah. Penelitian ini bertujuan untuk mempelajari pengaruh penetralisir tanah terhadap perbaikan sifat kimia tanah, peningkatan pertumbuhan dan hasil kedelai. Penelitian dilakukan di rumah kaca, Balai Penelitian Tanah, Bogor pada bulan November 2010- Maret 2011. Penelitian menggunakan contoh tanah Ultisol yang diambil dari Kentrong, Lebak, Banten dan tanah Inceptisol dari Cidahu, Ciampea, Bogor, Jawa Barat, Indonesia. Percobaan dilakukan dengan dua kegiatan, yaitu percobaan tanpa tanaman dan dengan tanaman kedelai. Percobaan dilakukan dengan rancangan acak kelompok 6 perlakuan, 3 ulangan. Perlakuan merupakan 5 dosis penetralisir tanah dan perlakuan kapur sebagai pembanding. Pada percobaan tanpa tanaman contoh tanah yang digunakan seberat 5 kg, dan percobaan dengan tanaman seberat 10 kg. Pengamatan dilakukan terhadap sifat kimia tanah dan hasil tanaman kedelai. Hasil penelitian ini menunjukkan bahwa pemberian penetralisir tanah tidak berpengaruh nyata (p>0.1) terhadap peningkatan pH, Ca, Mg, kejenuhan basa, penurunan Al dapat dipertukarkan, dan kejenuhan Al. Penetralisir tanah tidak meningkatkan pertumbuhan dan hasil kedelai baik pada tanah Ultisol maupun Inceptisol.
EFFECT OF AMELIORATION AND K FERTILIZATION ON POTASSIUM Q-I RELATIONSHIP PARAMETERS ON ACID MINERAL SOIL SUBIKSA, I GUSTI MADE; ADININGSIH, J SRI; SUDARSONO, .; SUBIHAM, SUPANDI
Jurnal Tanah dan Iklim (Indonesian Soil and Climate Journal) No 22 (2004): Desember 2004
Publisher : Balai Besar Penelitian dan Pengembangan Sumberdaya Lahan Pertanian

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21082/jti.v0n22.2004.%p

Abstract

Relationship between cations adsorbed in solid phase (Qfactor) and those in soil solution (I-factor) can be expressed by quantity-intensity (Q-I) relationship curve of K that was introduced by Beckett. A laboratory experiment to study the effect of amelioration and K fertilization on K Q-I parameters was carried out on three soil families of acid upland mineral soil from Cigudeg, Kentrong, and Papanrejo. The experiment was arranged using completely randomized design with 2 factors. The first factor was three kinds of ameliorant and the second factor was three levels of K fertilization. The result suggested that amelioration with dolomite and steel slag increased K buffering capacity (PBCK) due to the increase in cation exchange capacity (CEC) and Ca and Mg concentration of the soil solution.Conversely, amelioration decreased equilibrium activity ratio of K (ARKe) due to alteration of K-Ca?Mg equilibrium. Amelioration, however, did not affect labile-K, except for Cigudeg soil. The application of K fertilizer increased K availability in terms of ARKe and labile-K. Those three soil families performed different changes in K availability effect, where soil with higher CEC showed smaller change than the lower one, also tended todecrease K buffering capasity (PBCK). The implication of this study is amelioration practice must be followed by K fertilization in order to avoid plant deficiency in K nutrient.
EFFECT OF OXALIC ACID, NA+, NH4 +, AND FE3+ ON AVAILABILITY OF SOIL K, PLANT N, P, AND K UPTAKE, AND MAIZE YIELD IN SMECTITIC SOILS NURSYAMSI, DEDI; IDRIS, K.; SABIHAM, SUPIYANDI; RACHIM, D.A; SOFYAN, AGUS
Jurnal Tanah dan Iklim (Indonesian Soil and Climate Journal) No 28 (2008): Desember 2008
Publisher : Balai Besar Penelitian dan Pengembangan Sumberdaya Lahan Pertanian

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21082/jti.v0n28.2008.%p

Abstract

Smectitic soils have high prospect to be developed for agricultural land under a proper soil and plant management. The soils are commonly high in total K content. It?s availability for plant growth, however, is relatively low due to fixation by smectite in interlayer space. Researches aimed to study the effect of oxalic acid, Na+, NH4+, and Fe3+ on availability of soilK, plant N, P, and K uptake, as well as maize yield in smectitic soils have been conducted in Laboratory of Research and Soil Test and Green House of Indonesian Soil Research Institute, Bogor. Four different types of bulk soil samples taken from Bogor (Typic Hapludalfs), Cilacap (Chromic Endoaquerts), Ngawi (Typic Endoaquerts), and Blora (Typic Haplustalfs) were used for experiments. Incubation and pot experiments were set up using Factorial Randomized Completely Block Design with three replication and pot experiment used maize of Pioneer 21 variety as plant indicator. The first factor was oxalic acid rates: 0; 1,000; 2,000; and 4,000 ppm, while the second one was application of cations: without cation, Na+, NH4+, and Fe3+ from NaCl, NH4Cl, and FeCl3 respectively with 50% of maximum adsorption rate. The Fe3+ with 50% of maximum adsorption rate caused plant death, thus the experiment was repeated in the nextseason with Fe3+ rates: 0, 125, 250, 375, and 500 ppm. The results showed that oxalic acid, Na+, NH4+, and Fe3+ significantly increased the availability of soil K in both Alfisols and Vertisols where the effect was higher in Vertisols than Alfisols. The effectiveness of the treatments to release K from non available to available K form in the soils was in order of Fe3+ > NH4+ > Na+ > oxalic acid. Oxalic acid significantly increasedplant N, P, and K uptake in Vertisols, while 125 ppm of Fe3+ significantly increased plant K uptake in Alfisols as well as N, P, and K uptake in Vertisols. Oxalic acid significantly increased 4- week-after-planting biomass dry yield in Typic Hapludalfs and Typic Endoaquerts, while 125 ppm of Fe3+ significantly increased the yield in Chromic Endoaquerts and Typic Endoaquerts.
LAHAN BEKAS TAMBANG TIMAH DI PULAU BANGKA DAN BELITUNG, INDONESIA DAN KESESUAIANNYA UNTUK KOMODITAS PERTANIAN (EX-MINING LAND IN BANGKA AND BELITUNG ISLANDS, INDONESIA AND THEIR SUITABILITY FOR AGRICULTURAL COMMODITIES) Sukarman, nFN; Gani, Rachmat Abdul
Jurnal Tanah dan Iklim (Indonesian Soil and Climate Journal) Vol 41, No 2 (2017)
Publisher : Balai Besar Penelitian dan Pengembangan Sumberdaya Lahan Pertanian

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21082/jti.v41n2.2017.101-114

Abstract

Abstrak: Penambangan timah di Indonesia pada umumnya dilakukan dengan sistem terbuka dengan mengeruk dan merusak tanah lapisan atas sehingga mempengaruhi kesesuaian lahan untuk pertanian. Tujuan penelitian ini adalah untuk mempelajari karakteristik tanah dan biofisik lahan di areal bekas tambang timah di Pulau Bangka dan Belitung serta menilai kesesuaiannya untuk tanaman pertanian. Penelitian dilaksanakan pada bulan Maret sampai Mei 2016 dengan metode survei dan pemetaan lahan. Hasil penelitian menunjukkan bahwa lahan bekas tambang di kedua pulau tersebut seluas 125.875 ha. Telah terjadi perubahan bentang lahan, yaitu dengan terbentuknya kolong dan timbunan hasil galian. Timbunan galian dibagi menjadi: (1) Tanah galian bagian atas (tanah pucuk), merupakan campuran antara horison A, B dan horison C tanah asli, (2) Tanah galian bagian bawah berasal dari horison C tanah asli, (3) Tailing berupa pasir kuarsa dan sisa pencucian biji timah, dan (4) Campuran tailing dan galian bagian bawah. Tailing dicirikan oleh tekstur kasar dan kandungan hara yang sangat rendah. Tanah pucuk relatif lebih baik dicirikan oleh tekstur sedang sampai agak kasar, dan kandungan C-organik serta hara paling tinggi dibandingkan bagian lainnya. Logam berat yang ditemukan adalah Cu, Pb, Cd, dan Hg. Tanah galian bagian bawah mengandung logam berat paling tinggi, namun kandungan tersebut tergolong sangat rendah dan dalam batas yang aman. Sebagian besar lahan bekas tambang tergolong kelas N1 (tidak sesuai saat ini) karena lahan sudah mengalami degradasi berat. Masukan yang diberikan harus tinggi, agar tanaman yang dibudidayakan dapat tumbuh secara optimal.Abstract. Tin mining in Indonesia is generally done with an open system by dredging and damaging the topsoil, and hence it changes land suitability. The purpose of this research is to study soil and biophysical characteristics of land in ex-tin mining area in Bangka and Belitung Islands and assess its suitability for agricultural crops. The study was conducted from March to May 2016 with survey and land mapping methods. The results showed that the area of ex-mining land on both islands was 125,875 ha. There has been tremendous changes of the landscape, with the formation of small lakes (voids) and pile of excavation. Heaps of the excavation are: (1) Top soil containing the mixture of horizons A, B and C of the original soil, (2) The bottom part which was derived from C horizon of the original soil, (3) Tailings of quartz sand resulted from washing separating the sand and the ore, and (4) Mixture of tailings and bottom part of soil excavation. Tailing is poorest in fertility and characterized by coarse texture and very low nutrient content. The ?top soil? layer is relatively better and characterized by moderate to slightly coarse textures, and the highest in organic and nutrient content than other parts. The heavy metals found were Cu, Pb, Cd, and Hg. The bottom part of excavation contains the highest heavy metals, but the content was within the acceptable limits. Land suitability assessment shows that most of the ex-mining land is classified as N1 (Currently Not Suitable) because the land has experienced severe degradation. The input should be high, so that the cultivated plants can grow optimally.
EFFECTS OF TYPE OF PHOSPHATE ADSORBENT COMPOUND AND SOURCE OF P FERTILIZER ON PHOSPHATE SUPPLYING CAPACITY OF PEAT MATERIAL MASGANTI, .; NOTOHADIKUSUMO, T.; MAAS, A.; RADJAGUKGUK, B.
Jurnal Tanah dan Iklim (Indonesian Soil and Climate Journal) No 21 (2003): Desember 2003
Publisher : Balai Besar Penelitian dan Pengembangan Sumberdaya Lahan Pertanian

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21082/jti.v0n21.2003.%p

Abstract

Peat soil has a negative charge through its functional groups such as carboxylic. On other side, phosphate is essential nutrient available in the form of anion, that the P becomes easily carried by leaching water. The use of P adsorbent compound could strengthen the bound between P anion and peat colloid, so the loss of P can be reduced. Besides that, the use of slow released P fertilizer containing adsorbent cations can also reduce the total P in the leachate. A laboratory experiment was conducted to determine kinds of adsorbent compound and source of P fertilizer which effectively increase P retention and P supplying capacity of sapric peat material from Berengbengkel, Palangkaraya, Central Kalimantan. The experiment was carried out in the Soil Laboratory, Gadjah Mada University, Yogyakarta from September until November 2001. The treatment factorsimposed were (1) kinds of adsorbent compound : CaCO3; CaSO4; CaCl2; MgCO3; MgSO4; MgCl2; K2CO3; K2SO4; KCl; Na2CO3; Na2SO4; NaCl; (NH4)2CO3; (NH4)2SO4; and NH4 Cl, and (2) source of P fertilizer: SP-36 and rock phosphate. The experiment was arranged in a randomized complete design with three replications. One hundred grams of moist sapric peat material (containing about 100% water) was mixed with adsorbent compound and 30 ?g g-1 P fertilizer, and incubated for one week. For five consecutive weeks, the peat was leached with 200 ml waterevery week. The parameters observed were P retention and supplying capacity of the peat. The results showed that P retention and P supplying capacity of the peat material were strongly affected by kinds of adsorbent compound, source of P fertilizer, and interaction of both. The P retention and P supplying capacity of the peat became maximum if using CaCO3 as an adsorbent compound and rock phosphate as a source of Pfertilizer.
PENINGKATAN PRODUKTIVITAS KELAPA SAWIT DI LAHAN GAMBUT MELALUI PEMANFAATAN KOMPOS TANDAN BUAH KOSONG DAN BERBAGAI DEKOMPOSER Masganti, Masganti; Nurhayati, Nurhayati; Widyanto, Hery
Jurnal Tanah dan Iklim (Indonesian Soil and Climate Journal) Vol 43, No 1 (2019)
Publisher : Balai Besar Penelitian dan Pengembangan Sumberdaya Lahan Pertanian

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21082/jti.v43n1.2019.13-20

Abstract

Abstrak. Masalah utama yang dihadapi dalam pengembangan perkebunan kelapa sawit rakyat antara lain adalah rendahnya produktivitas karena kelapa sawit sebagian besar dibudidayakan di lahan gambut yang rendah kesuburan tanahnya serta relatif rendahnya input hara. Peningkatan produktivitas kelapa sawit di lahan gambut dapat dilakukan melalui penggunaan amelioran dari tandan buah kosong yang dibuat menggunakan dekomposer. Penelitian dilaksanakan pada Januari-Desember 2016 di lahan kebun kelapa sawit milik petani yang berumur sekitar lima tahun di Kabupaten Pelalawan, Provinsi Riau, Indonesia. Penelitian bertujuan untuk menentukan jenis dekomposer yang terbaik untuk pembuatan kompos tandan buah kosong sehingga dapat meningkatkan produktivitas kelapa sawit yang dibudidayakan di lahan gambut. Penelitian menguji berbagai dekomposer yang digunakan dalam pembuatan kompos tandan buah kosong (K-td) tanpa dekomposer, Dekomposer sd (K-sd), Dekomposer bm (K-bm), Dekomposer ol (K-ol), Kompos tp (K-tp), dan dekomposer em (K-em). Perlakuan ditata dalam rancangan acak kelompok (RAK) dengan tiga ulangan. Pengamatan dilakukan terhadap sifat kimia tanah sebelum aplikasi pemupukan pertama dan setelah 6 bulan kemudian, kualitas kompos, dan respon tanaman kelapa sawit. Hasil penelitian menunjukkan bahwa pertambahan pelepah daun tidak dipengaruhi oleh perlakuan, tetapi pertambahan berat pelepah, dan produktivitas sangat dipengaruhi oleh perlakuan. Produktivitas tertinggi (1,87 ton ha-1 bulan-1) dihasilkan dari penggunaan amelioran K-sd, yaitu kompos tandan buah kosong mengandung mikroba aerob perombak lignin, selulosa, protein, lipid, asam amino, dan mengandung tricoderma.Abstract. The main problem in smallholder plantation is low productivity because oil palm is cultivated mostly in degraded peatlands with low external inputs. Increased productivity of palm oil in degraded peatlands can be done through amelioration and using decomposers. This research was conducted in January-December 2016 in a smallholder 5-year old oil palm plantation Pelalawan District, Riau Province, Indonesia. The study aimed to determine the best type of decomposer to improve the growth and productivity of oil palm cultivated in degraded peatlands. The research tested several decomposers which were involved in composting empty fruit bunches, i.e. without decomposer (K-td), K-sd decomposer, K-bm decomposer, Decomposer K-ol, K-tp Compos, and K-em dekomposer. The treatments were arranged in a randomized block design (RAK) with three replications. Observations were made on soil chemical properties before amelioration and six months after amelioration, compost quality, and plant responses. The results showed that leaves leaf growth was not affected by treatment, but the weight of midrib, and the productivity was strongly influenced by the treatment. The highest productivity (1.87 ton ha-1 month-1) was obtained from the use of ameliorant K-sd, i.e. empty fruit bunch compost containing aerobic microbes of lignin, ceLlulose, protein, lipid, and amino acid decomposers, as well as tricoderma.

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