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STUDI NITRIFIKASI TANAH DENGAN PENAMBAHAN SERESAH ASAL HUTAN ALAMI DAN AGROFORESTRI KOPI Qifli, Anita Kismi; Hairiah, Kurniatun; Suprayogo, Didik
Jurnal Tanah dan Sumberdaya Lahan Vol 1, No 2 (2014)
Publisher : University of Brawijaya

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Abstract

Forest conversion to coffee agro forestry has decreased quality and amount of litter fall, increase decomposition rate and litter fall mineralization. This research was aimed measuring soil nitrification rate by addition of forest, coffee based agro forestry with mix shade trees and legume-shaded coffee (Gliricidia sepium) and monoculture of coffee litter fall. This research that was conducted in May-June 2005 used Inceptisol  and litter fall of forest, coffee based agro forestry with mix shade trees and legume-shaded coffee (Gliricidia sepium) and monoculture of coffee from Bodong, Sumberjaya, Lampung Barat. Litter fall was collected by litter trap. This research was compiled in a completely randomized design with aerobic incubation method during 8 week in laboratory by 5 treatment addition of forest, coffee based agro forestry with mix shade trees and legume-shaded coffee (Gliricidia sepium), monoculture of coffee litter fall and control (non litter fall addition). Measurement conducted adding litter fall and soil has incubation during 2 weeks. Soil nitrification rate determined by comparing concentration of NH4+ and NO3- after added of litter fall. Data analysis was used one-way. Result of research showed that (1) addition of litter fall has significant (p<0.01) to concentration of NH4+ and NO3- - and N-mineral of soil (2) addition of litter fall has significant (p<0.01) to NH4+ /NO3- ratio (3) addition of coffee monoculture litter fall has yield concentration of NO3- higher than forest and coffee based agro forestry with mix shade trees litter fall (4) addition of coffee monoculture litter fall has yield ratio of NH4+ and NO3- lower (0.1mg kg-1) than addition of forest litter fall (1mg kg-1), coffee based agro forestry with mix shade trees litter fall (0.4mg kg-1) and legume-shaded coffee (Gliricidia sepium) litter fall (0.8mg kg-1). This result of research indicated that adding litter fall like forest, coffee based agro forestry with mix shade trees and legume-shaded coffee (Gliricidia sepium) litter fall can depress soil nitrification rate until 96%.
PERBAIKAN BIOPORI OLEH CACING TANAH (Pontoscolex corethrurus). APAKAH PERBAIKAN POROSITAS TANAH AKAN MENINGKATKAN PENCUCIAN NITROGEN ? Amirat, Farah; Hairiah, Kurniatun; Kurniawan, Syahrul
Jurnal Tanah dan Sumberdaya Lahan Vol 1, No 2 (2014)
Publisher : University of Brawijaya

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Abstract

The addition of organic fertilizer into soil increased earthworm growth and its activity and, not only for decomposer group but also for soil digger group (ecosystem engineer).Pontoscolex corethrurus is one of ecosystem engineer group create many channel in soil, so that increased soil porosity and infiltration in soil The objective of this research was to study on N leaching in various biopores condition which formed by earthworm`s activity. Various level of soil porosity and nitrate consentration at controlled condition was obtained from application of  mixture of 3 types of litter (coffee, Gliricidia and durian), N-urea fertilizer and soil digger earthworm (Pontoscolex corethrurus) into soil.  The treatments tested were (1) KO : Control 1 (without worm, N-Organik and N-Anorganik); (2) KCC : Control 2 (added earthworm, without N-Organic and N-inorganic); (3) UREA : (added earthworm + N-inorganic, without N-Organik); (4) KGD : (added earthworm and N-Organic, without N-inorganic); (5) KGDU : (added earthworm + N-inorganic + N-Organic). Each treatment was repeated four times. The biopores formed by earthworm was measured  from the length of soil channel  at 1st, 2nd, 4th, 6th and 8th weeks after treatments (WAP). Measurement on earthworm`s growth was conducted with measuring earthworm`s length, diameter, biomass and casting by the end of treatment (8 WAP). Analysis of nitrate in leachete was done at 2nd, 4th, 6th and 8th  WAP. Result of this research showed that application of N-anorganic only led to more active earthworm rather (83 %) than application of N-organic resulting longer vertical channel formed by earthworm.  However, the increasing the length of vertical channel was not followed by increasing of water percolation. Porosity was related to nitrat leached concentration (R2 = 0.36). Total of leaching was not only influenced by porosity but also by another factor like NO3- -available (influence by N source input). Application of N-anorganic increased concentration of leached NO3- (42 %) than application of N-organic (181 mg L-1 concentration of leached NO3-). No significant (p>0.05) correlation between soil porosity and earthworm`s biomass was found.
RESPON CACING PENGGALI TANAH Ponthoscolex Corethrurus TERHADAP BERBAGAI KUALITAS SERESAH Setyaningsih, Herwin; Hairiah, Kurniatun; Dewi, Widyatmani Sih
Jurnal Tanah dan Sumberdaya Lahan Vol 1, No 2 (2014)
Publisher : University of Brawijaya

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Abstract

Forest conversion to agriculture systems leads to change on litter input (quantitatively and qualitatively) resulting lower diversity, population density and biomass of earthworm. Litter with ratio C/N <20, or ratio of (lignin (L)+polifenol (P))/N <10 classified as high quality which decomposed rapidly. Six types of litter application were tested i.e. prunning of cofee with the lowest (L+P)/N of 7.5, Gliricidia (L+P)/N of 10, avocado with (L+P)/N of 31, Cofee+Gliricidia with (L+P)/N of 12, Cofee+Gliricidia+ avocado with the highest (L+P)/N of 64. As control soil without litter application was used. Applying tree litters regardless their quality increased significantly (p<0.05) all growth parameters of earthworm, except for Gliricidia application lead to higher level of earthworm mortality starting at 20 days after treatment. Applied a low quality of avocado litter to the soil produced the highest biomass (0.79 g/indiv.), diameter (2.42 mm/indiv.) and length (6.13 cm/indiv.). Mixing coffee litter with Gliricidia litter increased earthworm mortality (5.5% to 42.5%) and reduced production of cocoon (2 become 0 cocoons) compared to coffee applied alone. Coffee+Gliricidia+Avocado lead to longer live earthworm up to 80 days Apparently Gliricidia litter producing chemical substances which harmful to earthworm.Keyword: earthworm, litter quality, forest conversion
Potential Nitrification and Nitrogen Mineral of Soil in Coffee Agroforestry System with Various Shading Trees ., Purwanto; Handayanto, Eko; Suprayogo, Didik; Bako Baon, John; Hairiah, Kurniatun
Pelita Perkebunan (Coffee and Cocoa Research Journal) Vol 23, No 1 (2007)
Publisher : Indonesian Coffee and Cocoa Research Institute

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Abstract

The role of shading trees in coffee farms has been well understood to establish suitable condition for the growth of coffee trees, on the other hand their role in nitrogen cycle in coffee farming is not yet well understood. The objectives of this study are to investigate the influence of various legume shading trees on the concentration of soil mineral N (N-NH4 + and N-NO3-), potential nitrification and to study the controlling factors of nitrification under field conditions. This field explorative research was carried out in Sumberjaya, West Lampung. Twelve observation plots covered four land use systems (LUS), i.e. 1) Coffee agroforestry with Gliricidiasepium as shade trees; 2) Coffee agroforestry with Gliricidiaas shade trees and Arachis pintoias cover crops; 3)Coffee agroforestry with Paraserianthes falcataria as shade trees; and 4) Mixed/multistrata coffee agroforestry with Gliricidiaand other fruit crops as shade trees. Measurements of soil mineral-N concentration were carried out every three weeks for three months. Results showed that shade tree species in coffee agroforestry significantly affected concentrations of soil NH4 +, NO3- and potential nitrification. Mixed coffee agroforestry had the highest NH4+/N-mineral ratio (7.16%) and the lowest potential nitrification (0.13 mg NO2-kg-1 hour -1 ) compared to other coffee agroforestry systems using single species of leguminous shade trees. Ratio of NH4 + /N-mineral increased 0.8—21% while potential nitrification decreased 55—79% in mixed coffee agroforestry compared to coffee agroforestry with Gliricidia or P. falcatariaas shade trees. Coffee agroforestry with P. falcatariaas shade trees had potential nitrification 53% lower and ratio of NH4 + /N-mineral concentration 20% higher than that with Gliricidia. Coffee agroforestry with P. falcataria as shade trees also had organic C content 17% higher, total N 40% higher, available P 112% higher than that with Gliricidia. The presence of A. pintoiin coffee agroforestry with Gliricidiareduced 56% potential nitrification but increased 19.3% of NH4+/N-mineral concentration. The low soil potential nitrification in the mixed coffee agroforestry had close relationship with the high content of soil organic matter. Key words : Nitrogen-mineral, nitrification, shading trees, agroforestry, Coffea canephora, nitrate, organic matter, intercropping,Gliricidia sepium, Arachis pintoi, Paraserianthes falcataria.
Karakteristik Hutan Rakyat Jati dan Sengon serta Manfaat Ekonominya di Kabupaten Malang Sari, Rika Ratna; Hairiah, Kurniatun; Suyanto, Suyanto
Jurnal Ekonomi Pertanian dan Agribisnis Vol 2, No 2 (2018)
Publisher : Department of Agricultural Social Economics, Faculty of Agriculture, Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (501.443 KB) | DOI: 10.21776/ub.jepa.2018.002.02.6

Abstract

Penanaman pepopohan di lahan pertanian dalam sistem agroforestry dan hutan rakyat diharapkan mampu meningkatkan keberlanjutan lansekap yang dinilai dari aspek ekologi, sosial dan ekonomi. Hal ini dipengaruhi oleh manajemen lahan yang menentukan proses pengambilan keputusan terkait sistem penggunaan lahan yang dipilih dan jenis tanaman yang akan ditanam. Keberadaan pohon dalam sistem hutan rakyat diharapkan mampu memperbaiki produktivitas lahan dan dapat memberikan pendapatan untuk perbaikan dalam aspek ekonomi. Penilaian manfaat ekonomi pohon dalam kurun waktu tertentu dapat dilakukan melalui analisis Net Present Value (NPV). Tujuan dari penelitian ini adalah mengevaluasi keuntungan yang diperoleh petani pada sistem hutan rakyat khususnya tanaman sengon dan jati dibandingkan dengan tanaman semusim (jagung dan bawang merah) serta menganalisis sistem mana yang lebih menguntungkan ditinjau dari aspek ekonomi dan ekologi.Survey dilakukan dengan metode purposive sampling dengan tujuan untuk mendapatkan informasi terkait biaya produksi dan pendapatan dari petani yang benar-benar mengelola sistem hutan rakyat. Penelitian ini dilakukan pada di Kabupaten Malang yang merupakan sentra hutan rakyat di Jawa Timur. Populasi pohon rata-rata pada hutan rakyat adalah 1396 pohon ha-1. Hutan rakyat jati dan sengon, sekitar 77% didominasi oleh kayu sedang (BJ 0,6 – 0,75 g cm-3), dan 23% kayu ringan. Total cadangan karbon di Hutan rakyat jati cukup tinggi bila dibandingkan dengan hutan rakyat sengon. Secara ekonomi, hutan rakyat jati memiliki nilai NPV tertinggi yakni Rp. 643.514.720,-/ha/30 tahun, sedang hutan rakyat sengon sekitar 44% lebih rendah (Rp. 357.833.338,-/ha/30 tahun). Nilai NPV pada hutan rakyat lebih tinggi dibandingkan dengan tanaman semusim sehingga hutan rakyat lebih menguntungkan secara ekonomi dibandingkan tanaman semusim. Secara ekologi hutan rakyat mampu memperbaiki kondisi lahan dan kesuburan tanah secara perlahan melalui masukan seresahnya, serta dapat menekan limpasan permukaan karena tutupan kanopinya dan meningkatkan cadangan karbon
Soil Carbon Transitions Supporting Climate Change Mitigation Hairiah, Kurniatun
SAINS TANAH - Journal of Soil Science and Agroclimatology Vol 15, No 2 (2018): December
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15608/stjssa.v15i2.24972

Abstract

Maintaining and where feasible restoring soil carbon stocks is part of all sustainable development strategies that have a chance of meeting the global commitment of the Paris Agreement to contain global warming within a 1.5oC limit. Active policies to incentivize increased soil carbon storage require under­standing of the drivers of soil carbon decline, as well as the conditions under which soil management leads to an increase. Soil carbon transitions -- shifts from decline to increase of soil carbon stocks -- have been recorded as part of agricultural intensification. Organic inputs supporting soil carbon may primarily depend on roots, rather than aboveground inputs, and thus on the choice of crops, trees, and grasses that make up an agricultural land use system.