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All Journal Journal of Tropical Soils JTSL (Jurnal Tanah dan Sumberdaya Lahan) Jurnal Ilmu-Ilmu Pertanian Indonesia Jurnal Solum Jurnal Ilmiah Pertanian

Dian Fiantis

Andalas University

Author-ID : 448201

Agriculture, Biological Sciences & Forestry Environmental Science

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KURVA SORPSI FOSFAT MENURUT LANGMUIR DAN FREUNDLICH SEBAGAI PENDUGA KEBUTUHAN PUPUK FOSFAT PADA ANDISOLS SUMATERA BARAT Dian Fiantis
Jurnal Solum Vol 1, No 1 (2004): Jurnal SOLUM
Publisher : Jurusan Tanah Fakultas Pertanian Universitas Andalas

Andisols are among the most productive soils in the world, but these soils also strongly retained phosphate. The high capacity for phosphate sorption in Andisols is due to their high content of active Al and Fe compounds. The objectives of this study were to assess the effect of soil properties on P sorption, buffer capacities and requirements of some benchmark soil profiles in Mt. Marapi and Mt. Pasaman. The P sorption characteristics of Andisols from West Sumatra were described using Langmuir and Freundlich equations. The P sorption maximum in Mt. Pasaman soils was higher than in Mt. Marapi soils. The most important soil properties affecting P sorption and buffer capacities were oxalate Si and Fe, Al (Sio Feo and Alo), dithionite Al (Ald), pyrophosphate Al (Alp), which explained 89% of the variance in sorption maxima and 83% of P buffering indices. Allophane, Alo and Ald were positively correlated with P sorption maximum. Contrary to general assumption that organic matter had an inverse relation with P sorption maxima, in this study, however, there was no trend observed between P sorption maxima and organic carbon. Organic C has poor relationship with this parameter. Andisols from Mt. Marapi and Mt. Pasaman need P input between 320 to 7,800 mg P kg-1 to maintain the P level in soil solution at 0.2 mg kg-1.

KESESUAIAN LAHAN DAN POTENSI PRODUKSI TANAMAN GAMBIR DI KABUPATEN PESISIR SELATAN SUMATERA BARAT J Juniarti; Y Yuzirwan; Dian Fiantis
Jurnal Solum Vol 1, No 1 (2004): Jurnal SOLUM
Publisher : Jurusan Tanah Fakultas Pertanian Universitas Andalas

The land suitability study for gambir crop (Uncaria gambir, Roxb) in the buffer zone of the National Park of Kerinci Seblat (Taman Nasional Kerinci Seblat) at Salido Saribulan, sub district IV Jurai, Pesisir Selatan was investigated. The objective of this study was to estimate the land suitability for gambir in Salido Saribulan. The soils were sampled in composite ways for analyses in laboratory. The results showed that according to climatic and physical land condition, the studied area was considered as class S1 (highly suitable). However, based on land suitability class, it was grouped as S3f (marginally suitable with some constraints in the availability of soil nutrients). We suggested that to increase gambir production in the studied area can be done by adding some fertilizers both organic and inorganic ones.

PERANAN KOLOID Al DAN Fe AKTIF DALAM PROSES RETENSI FOSFAT PADA ANDISOLS DARI SUMATERA BARAT Dian Fiantis
Jurnal Solum Vol 1, No 2 (2004): Jurnal SOLUM
Publisher : Jurusan Tanah Fakultas Pertanian Universitas Andalas

The presence of active Al and Fe compounds in large amount in Andisols has caused strong P-retention on these mineral structure or it is bound on OH functional group or positively charged H. The objective of this research was to provide fundamental information to manage and conserve Andisols as used to be vegetable production centre in West Sumatra. The results showed that volcanic soil from Pasaman Mountain had higher retention capacity than that of Marapi Mountain. Therefore, it was needed more P for optimum plant growth. The most dominant soil properties affected pattern and amount of P retention was due to type of clay mineral found in volcanic soils. The dominant clay mineral on Andisols in West Sumatra was alofan and ferryhydrite (non-crystalline clay mineral) which are active component of Al and Fe colloids. Key Words: Volcanic ash soil, P retention, Alofan

Co-Authors Amrizal Saidi Auliadesti, Vivin Dwi Fitri Yudiantoro Gusnidar, G J Juniarti Mohammad Nurcholis, Mohammad Raudhatu Shofiah Roslan Ismail Saftia Laila Rajmi Siska Amelia Sri Aminah Suwartikaningsih Susila Herlambang Suwartikaningsih, Sri Aminah Syafrimen Yasin Y Yuzirwan

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