Characteristics of peat soils and management implication for agricultural development in Asahan regency, North Sumatra

Many factors must be considered in agricultural development in North Sumatra ranging from farmers as producers, availability of land for production, cultivation of planting, superior seeds, fertilizers, agricultural facilities/tools, infrastructure, post-harvest, distribution, processing of produce, price stability, to fulfilled food at the level of consumption. The purpose of this study is to analyze the performance of agribusiness systems as well as socio-economic factors of soybean farmers in North Sumatra. To assess the performance of agribusiness systems with good criteria, good enough and less good used questionnaire data by shifting the answer score by weight. To test socioeconomic factors, a formula for multiple linear regression is used. The results showed that farmers in carrying out aspects of organizing on average were good (score 31.6). Statistical tests of socio-economic factors of age (X2), education (X3), number of dependents (X5) have no real effect on the income of soybean farmers (Y) while land area (X1)and experience (X4) have a real effect on the income of soybean farmers (Y).

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Contribution of Economic Sector and Agricultural Development to Support Food Security in North Sumatra Province

Advanced Science Letters ◽

10.1166/asl.2017.9643 ◽

2017 ◽

Vol 23 (7) ◽

pp. 6428-6431

Author(s):

Fahmi W Kifli ◽

Arif Umami

Keyword(s):

Food Security ◽

Agricultural Development ◽

Economic Sector ◽

North Sumatra

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MINERALOGICAL AND CHEMICAL CHARACTERISTICS OF SPODOSOLS IN TOBA HIGHLAND, NORTH SUMATRA

Indonesian Journal of Agricultural Science ◽

10.21082/ijas.v10n2.2009.54-64 ◽

2016 ◽

Vol 10 (2) ◽

pp. 54

Author(s):

B. H. Prasetyo

Keyword(s):

Agricultural Development ◽

Acid Soil ◽

Soil Horizon ◽

Soil Reaction ◽

Chemical Characteristics ◽

Sand Fraction ◽

Organic C ◽

Stage Of Development ◽

Coarse Texture ◽

North Sumatra

Spodosols are problem soils due to coarse texture, acid soil reaction, low nutrient status, and low soil moisture retention. About 2.16 million ha of Spodosols (1.1% of the Indonesian land areas) distributed in lowland and highland areas in Kalimantan, Sumatra, Sulawesi, and Papua. Spodosols of the Toba highland areas require special attention because these forested lands are gradually cleared, but then abandoned because they are not suitable for agricultural development, causing land degradation. This study aimed to evaluate mineralogical and chemical characteristics of Toba highland Spodosols, North Sumatra, and their implication on agricultural development. Three pedons of the Toba highland Spodosols from Humbang Hasundutan regency were studied, consisted of soils developed from volcanic sand overlying liparite tuff under the influence of low temperature and high rainfall. Field observation was conducted in January 2008. Fifteen soil samples were collected from the three pedons based on the depth of soil horizon. Results indicated that the formation of these Spodosols were influenced by parent material, high elevation (1676-1821 m) above sea level), and by high amount of rainfall (2167 mm). The Spodosols in Toba highland were still in the early stage of development as characterized by shallow effective soil depth (22-23 cm), domination of weatherable minerals (39-81%) in the sand fraction and dominated by amorphous mineral as shown by sum of A1 + 1/2 Fe extracted by ammonium oxalate as much as 0.6-12.8%. The Spodosols were also characterized by coarse texture (66-95% sand fraction in E and B horizons), high organic-C content (1.4-37.7%), acid soil reaction (pH 3.7- 5.3), very high K2O in Oa horizon (552-933 mg kg-1) and B spodic or C horizon (812-2028 mg kg-1), and low base saturation (< 5%). The existence of biological processes in the surface layer was indicated by accumulation of exchangeable bases (0.88-1.14 cmolc kg-1 in Oa horizon and 0.09-0.25 cmolc kg-1 in B horizon), P2O5 (181-298 mg kg-1 in Oa horizon and 3-24 mg kg-1 in E horizon), and K2O (552-933 mg kg-1 in Oa horizon and 13- 30 mg kg-1 in E horizon). However, these nutrients were easily leached after deforestation. With the sandy texture, loose structure, and no vegetation cover, the erosion hazard is high in the deforested areas. Therefore, lands with Spodosols of the Toba highland, especially are not recommended for agricultural development, rather they should be kept as forest lands.

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MINERALOGICAL AND CHEMICAL CHARACTERISTICS OF SPODOSOLS IN TOBA HIGHLAND, NORTH SUMATRA

Indonesian Journal of Agricultural Science ◽

10.21082/ijas.v10n2.2009.p54-64 ◽

2016 ◽

Vol 10 (2) ◽

pp. 54

Author(s):

B. H. Prasetyo

Keyword(s):

Agricultural Development ◽

Acid Soil ◽

Soil Horizon ◽

Soil Reaction ◽

Chemical Characteristics ◽

Sand Fraction ◽

Organic C ◽

Stage Of Development ◽

Coarse Texture ◽

North Sumatra

Spodosols are problem soils due to coarse texture, acid soil reaction, low nutrient status, and low soil moisture retention. About 2.16 million ha of Spodosols (1.1% of the Indonesian land areas) distributed in lowland and highland areas in Kalimantan, Sumatra, Sulawesi, and Papua. Spodosols of the Toba highland areas require special attention because these forested lands are gradually cleared, but then abandoned because they are not suitable for agricultural development, causing land degradation. This study aimed to evaluate mineralogical and chemical characteristics of Toba highland Spodosols, North Sumatra, and their implication on agricultural development. Three pedons of the Toba highland Spodosols from Humbang Hasundutan regency were studied, consisted of soils developed from volcanic sand overlying liparite tuff under the influence of low temperature and high rainfall. Field observation was conducted in January 2008. Fifteen soil samples were collected from the three pedons based on the depth of soil horizon. Results indicated that the formation of these Spodosols were influenced by parent material, high elevation (1676-1821 m) above sea level), and by high amount of rainfall (2167 mm). The Spodosols in Toba highland were still in the early stage of development as characterized by shallow effective soil depth (22-23 cm), domination of weatherable minerals (39-81%) in the sand fraction and dominated by amorphous mineral as shown by sum of A1 + 1/2 Fe extracted by ammonium oxalate as much as 0.6-12.8%. The Spodosols were also characterized by coarse texture (66-95% sand fraction in E and B horizons), high organic-C content (1.4-37.7%), acid soil reaction (pH 3.7- 5.3), very high K2O in Oa horizon (552-933 mg kg-1) and B spodic or C horizon (812-2028 mg kg-1), and low base saturation (< 5%). The existence of biological processes in the surface layer was indicated by accumulation of exchangeable bases (0.88-1.14 cmolc kg-1 in Oa horizon and 0.09-0.25 cmolc kg-1 in B horizon), P2O5 (181-298 mg kg-1 in Oa horizon and 3-24 mg kg-1 in E horizon), and K2O (552-933 mg kg-1 in Oa horizon and 13- 30 mg kg-1 in E horizon). However, these nutrients were easily leached after deforestation. With the sandy texture, loose structure, and no vegetation cover, the erosion hazard is high in the deforested areas. Therefore, lands with Spodosols of the Toba highland, especially are not recommended for agricultural development, rather they should be kept as forest lands.

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Potential of phosphate solubilizing fungi isolated from peat soils as inoculant biofertilizer

Biodiversitas Journal of Biological Diversity ◽

10.13057/biodiv/d220605 ◽

2021 ◽

Vol 22 (6) ◽

Author(s):

Deni Elfiati ◽

Delvian DELVIAN ◽

Hamidah Hanum ◽

Arida Susilowati ◽

Henti Hendalastuti Rachmat

Keyword(s):

Peat Soil ◽

Selective Medium ◽

Soil Samples ◽

Available Phosphorus ◽

Peat Soils ◽

Insoluble Phosphate ◽

Value Range ◽

Qualitative Test ◽

Phosphate Solubilizing ◽

North Sumatra

Abstract. Elfiati D, Delvian, Hanum H, Susilowati A, Rachmat HH. 2021. Potential of phosphate solubilizing fungi isolated from peat soils as inoculant biofertilizer. Biodiversitas 22: 3042-3048. Phosphate-solubilizing fungi are the microbes that have the ability to dissolve insoluble phosphate and made it available for plants. Therefore, the purpose of this study was to obtain the phosphate-solubilizing fungi from peat soils. Peat soil samples were taken in a composite at a depth 0-20 cm from the peat ecosystem in Nagasaribu Village, Lintong Nihuta Sub-district, Humbang Hasundutan District, North Sumatra, Indonesia. Soil samples were isolated to obtain phosphate-solubilizing fungi using the Pikovskaya selective medium. The obtained isolates were tested for their ability to dissolve phosphate qualitatively by calculating the dissolution index values and quantitatively by calculating the available phosphorus on Pikovskaya medium by using four phosphate sources, namely Ca3(PO4)2, AlPO4, FePO4, and phosphate rock. Total of 12 isolates of phosphate-solubilizing fungi was obtained during the present study. Based on the results of qualitative and quantitative testing, all 12 isolates have the ability to release phosphate from the four tasted phosphate sources. The qualitative test obtains dissolution index values that vary from 2.55 to 4.25, while quantitatively, the isolates were able to dissolve phosphate in the value range from 17.77 ppm to 69.86 ppm. The top five fungal isolates with highest phosphate-solubilizing potential were FG5, FG8, FG9, FG11, and FG12. Based on molecular identification, these five isolates were identified as Aspergillus niger.

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Analisis Location Quotient (LQ) Tanaman Cabai Besar (Capsicum annuum L.) di Provinsi Sumatera Utara

Jurnal Ilmiah Pertanian ( JIPERTA) ◽

10.31289/jiperta.v2i2.357 ◽

2020 ◽

Vol 2 (2) ◽

pp. 169-179

Author(s):

Brama Caridio Subambhi ◽

Siti Mardiana ◽

Faoeza Hafiz Saragih

Keyword(s):

Capsicum Annuum ◽

Analytical Method ◽

Agricultural Development ◽

Development Program ◽

Secondary Data ◽

Development Planning ◽

Location Quotient ◽

Capsicum Annuum L ◽

North Sumatra

North Sumatra Province is a province that has a potential horticulture sector, which is a large chili plant, which is a long-term development program for 2016-2045, which was delivered at the Agricultural Development Planning Consultation (Musrenbangtan). Commodities priority becomes the main focus is the development of horticultural commodities chili, onion and garlic. This can be seen in the data from the Central Statistics Agency (BPS) of North Sumatra Province. The purpose of this study is to find out which regency is the base for large chili plants in North Sumatra Province. The analytical method used is, Location Quotient (LQ) Analysis with the data used in this study is secondary data. The planting area of large chilli plants and the production of large chili plants during the last ten years from 2007 to 2016. The results of the Location Quotient (LQ) Analysis show that the sector of the base for large chilli planting area has 5 highest districts, namely, Batu-Bara Regency, Phak-paak Bharat Regency, Dairi Regency, Humbang Hasundutan Regency, North Padang Lawas Regency. there are 5 highest chilli production base sectors, namely. District of Phak-pak Bharat, Batu Bara Regency, Mandailing Natal District, Langkat Regency and Nias Regency.

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