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Population Density of Damselfly Agriocnemis femina (Odonata: Coenagrionidae) in Manik Rambung Ricefield, Simalungun-Sumatera Utara

Jurnal Ilmu Pertanian KULTIVAR Vol 5, No 1 (2011)
Publisher : Jurnal Ilmu Pertanian KULTIVAR

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Abstract

The objective of this research was to study effect and correlation of physics-chemistries with density of A. femina. The method using Mark Release Recapture with 8 stations in Manik Rambung Village, Simalungun District. The result showed 2351 individuals of A. femina, consist of male 1345 individuals and female 1006 individuals. Comparison of male and female were 87% and 13%, while score of Lincoln’s indices highest calculated in twelve sampling were 451 individuals. The result of analysis correlation showed humidity given effects on population of density A. femina recapture were 0.432. Keyswords : Density, damselfly, Agriocnemis femina, rice field, Simalungun.

Determining Groundwater Recharge from Stream Flow with Seasonal Recession Method

Aceh International Journal of Science and Technology Vol 2, No 1: April 2013
Publisher : Graduate School of Syiah Kuala University

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Abstract

Abstract - Volume of groundwater recharge showed a picture of a watershed to determine the flow instability due to the physical characteristics of the watershed and precipitation. Many methods had been constructed to understand the dynamic movement of water discharge. One of them was the analysis of the stream hydrograph with Seasonal Recession Method. Information about groundwater recharge condition at several sub watershed in Krueng Peusangan Watershed was really needed in management of watershed for sustainable water resources. The study aimed to determine groundwater recharge from stream flow with seasonal recession method was conducted in Krueng Peusangan watershed, Aceh Province, Indonesia. The results showed that the trend pattern of the stream hydrograph could be explained using the exponential function where the dots lowest discharge that is the end of the recession (y) than any period of time on stream hydrograph semi logarithmic (x). The pattern of results that occurred in the watershed of Krueng Peusangan: (A) Krueng Seumpo had a trend for y = 9.2x-0.35, (B) Simpang Jaya  for y = 559.7x-0.5, (C) Beukah village for y = 142x-0.32 , (D) Sub watershed of Lut Tawar (Wih Nareh) for y = 1.3x-0.12 and (E) Sub watershed of Teupin Mane (Krueng Teumbo) for y = 1.94x-0.42. It also showed that the location of A, B, C, E had a higher slope and a decreased recharge pattern compared to the location of D (sub watershed of  Lut Tawar)  that tended to flat. The volume of groundwater recharge that occurred in a region (A and D) increased while the other location was very volatile. Moreover, recharge instability occurred in Krueng Teumbo. Therefore, it needed a clear direction for land use and functions of forests, especially in the recharge area, in order to maintain the balance of the hydrological cycle, and the quantity of groundwater. Keywords: groundwater recharge, seasonal recession method, base flow, stream flow, water resources

PEMETAAN STATUS UNSUR HARA C-ORGANIK DAN NITROGEN DI PERKEBUN NANAS (Ananas comosus L. Merr) RAKYAT DESA PANRIBUAN KECAMATAN DOLOK SILAU KABUPATEN

AGROEKOTEKNOLOGI Vol 1, No 4 (2013)
Publisher : Program studi Agroekoteknologi, Fakultas Pertanian, Universitas Sumatera Utara-Medan

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Abstract

ROSMENDA GINTING:Mapping of Nitrogen and C-Orgnic status on Pineapple(Ananas comosus L. Merr) plantations owned by people at the village of Panribuan Subdistrict ofDolok Silau Simalungun District superinted by Ir. Razali, MP. And Prof.Ir. Zulkifli Nasution,M. Sc.,Ph.D. This research purpose to make a mapping of Nitrogen and C-Orgnic status onPineapple plantations owned by people at the village of Panribuan Subdistrict of Dolok SilauSimalungun District The research start to do on October 2012 until January 2013. Method of takingsample uses the free method grid survey with detail scale and use correlation method to analysisdata, with interpretating in mapping Nitrogen and C-Organic. Parameter that analysis in laboratoryis Nitrogen and C-Orgnic status. The result of research showing that status Nitrogen devided by 1status such as; medium (35,44 ha), C-Organic devided by 4 status such as ; Low (0,19 ha), Medium(1,01 ha), high (12,89 ha), and highest (21,35 ha).C/N devided by 3 status such as ; Low (1,95 ha),Medium (11,70 ha) and high (21,79 ha). From the analysis data using correlation method, knownthat the no effect on the production are Nitrogen and C-Organic but that effect are C/N.Key words: Mapping, Nitrogen, C-Organic and C/N

DAMPAK PENGERUKAN PASIR TERHADAP KELIMPAHAN PLANKTON DAN KUALITAS AIR DI HULU DAERAH ALIRAN SUNGAI BELAWAN, KECAMATAN PANCUR BATU, KABUPATEN DELI SERDANG

AQUACOASTMARINE Vol 1, No 1 (2013): JURNAL AQUACOASTMARINE VOLUME 1, NO 1, DESEMBER 2013
Publisher : Program Studi Manajemen Sumberdaya Perairan, Fakultas Pertanian Universitas Sumatera Utara

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Abstract

Watershed is the area bounded ridge where the rain water that falls on the area will be accommodated by the ridge and will be streamed through small streams to the main river. The presence of sand dredging activities in upstream watersheds Belawan can be lower water quality and abundance of micro-organisms, including plankton. This research had been conducted from April to July 2013 in Belawan Watershed Headwaters. This research used Purpossive Random Sampling methods. There were 2 stations, Station 1: Pertampilen village, District Pancur Batu as an active area of sand dredging activities, Station 2: Salam Tani village, District Pancur Batu as areas which were far away from the sand dredging activities. Sampling activities were conducted 4 times once/month. The research aimed to knew water quality and determined the abundance of plankton in Belawan Watershed Headwaters.The results showed that at the station I, there were found 19 genera of phytoplankton and 1 genera of zooplankton and at the station II, there were only found 17 genera of phytoplankton. Plankton abundance at the station I was 85, 404 ind/l and at station II was 128,684 ind/l. Water quality at the station I had passed the thresholds as water quality raw materials, such as ammonia and nitrite. Turbidity also have very high at station I. This research showed that the sand dredging activity affected the abudance of plankton in the river.Keywords: Water Quality, Sand Dredging, Plankton, River

DAMPAK PENGERUKAN PASIR TERHADAP KELIMPAHAN PLANKTON DAN KUALITAS AIR DI HULU DAERAH ALIRAN SUNGAI BELAWAN, KECAMATAN PANCUR BATU, KABUPATEN DELI SERDANG

AQUACOASTMARINE Vol 1, No 1 (2013): JURNAL AQUACOASTMARINE VOLUME 1, NO 1, DESEMBER 2013
Publisher : Program Studi Manajemen Sumberdaya Perairan, Fakultas Pertanian Universitas Sumatera Utara

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Abstract

Watershed is the area bounded ridge where the rain water that falls on the area will be accommodated by the ridge and will be streamed through small streams to the main river. The presence of sand dredging activities in upstream watersheds Belawan can be lower water quality and abundance of micro-organisms, including plankton. This research had been conducted from April to July 2013 in Belawan Watershed Headwaters. This research used Purpossive Random Sampling methods. There were 2 stations, Station 1: Pertampilen village, District Pancur Batu as an active area of sand dredging activities, Station 2: Salam Tani village, District Pancur Batu as areas which were far away from the sand dredging activities. Sampling activities were conducted 4 times once/month. The research aimed to knew water quality and determined the abundance of plankton in Belawan Watershed Headwaters.The results showed that at the station I, there were found 19 genera of phytoplankton and 1 genera of zooplankton and at the station II, there were only found 17 genera of phytoplankton. Plankton abundance at the station I was 85, 404 ind/l and at station II was 128,684 ind/l. Water quality at the station I had passed the thresholds as water quality raw materials, such as ammonia and nitrite. Turbidity also have very high at station I. This research showed that the sand dredging activity affected the abudance of plankton in the river.Keywords: Water Quality, Sand Dredging, Plankton, River

PENGARUH AIR LAUT, ZEOLIT, DAN PASIR VULKAN TERHADAP STATUS HARA PADA TANAH GAMBUT SERTA PERTUMBUHAN DAN PRODUKSI PADI SAWAH

AGROEKOTEKNOLOGI Vol 2, No 1 (2013)
Publisher : Program studi Agroekoteknologi, Fakultas Pertanian, Universitas Sumatera Utara-Medan

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Abstract

ABSTRACTThe objective of this research is to improve the chemical properties of peat soil for increasing riceproductivity. The research using factorial randomized block design with 2 factors and 3 replications,consist of a) sea water, and b) mineral materials (zeolite and volcanic material). Mineral materials(M) consist of without mineral materials (M0), 2% zeolite mineral soil samples (200 gram/pot)(M1), volcanic material as much as 10% (1000 gram/pot) (M2), and mixture of zeolite minerals andvolcanic material (M3). Sea water like without sea water (0%) (A0), 25%v/v consentration of seawater (A25), 50% v/v consentration of sea water (A50), and 75%v/v consentration of sea water (A75).The results showed that the application of mineral zeolite and volcanic material significantlyincreased soil pH concentration, P- available, bulk density, dry weight of the canopy and root dryweight. Sea wate significantly decreased pH, cation exchange capacity, shoot and root dry weight,increasing electrical conductivity, base saturation but increasing P- available not significantly onempty grain and weight of 1000 grains.Keywords : sea water, zeolite, volcanic material, peat soil, and paddy

PENGARUH PEMBERIAN HORMON TIROKSIN TERHADAP PERTUMBUHAN DAN KELANGSUNGAN HIDUP IKAN BLACK GHOST (Apteronotus albifrons) The effect of giving the thyroxine hormone on growth and survival rate of Black Ghost fish (Apteronotus albifrons)

AQUACOASTMARINE Vol 5, No 4 (2014): JURNAL AQUACOASTMARINE VOLUME 5, NO 4, DESEMBER 2014
Publisher : Program Studi Manajemen Sumberdaya Perairan, Fakultas Pertanian Universitas Sumatera Utara

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Abstract

Black ghost fish is a fish which is good economic value, both in the national and international scope. Market demand for the black ghost fish high, so it requires an effort to fulfill consumer demand for the black ghost fish. One of the efforts is to giving stimulation with thyroxine hormone into the commercial feed which is used for the growth of the black ghost fish. This research aims to determine the optimum dose of decent used for the growth and survival of black ghost fish optimally. The tested fish used are black ghost fish size of 6 cm which is maintained in an aquarium sized 60 cm×40 cm×40 cm by 13 units with water volume 24 liters per aquarium arranged randomly. The design which is used was a completely randomized design (CRD) with doses of without treatment, 10 mg/kg, 15 mg/kg, 20 mg/kg and 25 mg/kg. The results showed that the optimum dose which is good for the growth and survival of black ghost fish is 25 mg/kg, which is 4.36 cm long growing from the initial length and weight growth of 4.96 g of initial weight.Keywords: Black Ghost, Thyroxine, Growth, Survival Rate

Tingkat Bahaya Erosi (TBE) Tanah Andisol pada beberapa Tipe Penggunaan Lahan dengan Metode USLE dan SIG di Desa Kutaraja Kecamatan Namanteran Kabupaten Karo

AGROEKOTEKNOLOGI Vol 3, No 4 (2015)
Publisher : Program studi Agroekoteknologi, Fakultas Pertanian, Universitas Sumatera Utara-Medan

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Abstract

Tingkat Bahaya Erosi (TBE) Tanah Andisol Pada Beberapa Tipe Penggunaan Lahan dengan Menggunakan Metode USLE di Desa Kutarakyat Kecamatan Namanteran Kabupaten Karo, di bimbing oleh Prof. Ir. Zulkifli Naustion, M.Sc, PhD sebagai ketua komisi pembimbing dan Mariani Sembiring, SP., MP sebagai anggota komisi pembimbing. Desa Kutarakyat Kecamtan Namanteran Kabupaten Karo merupakan daerah desa yang langsung bertepatan dengan Kabupaten Langkat dimana daerah ini masih didominasi oleh daerah hutan. Untuk mengetahui tingkat erosi tanah Desa Kutarakyat dilakukan suatu penelitian pada Juni-September 2011. Penelitian ini menggunakan metode survey dan dilanjutkan perhitungan laju erosi tanah metode USLE (Universal Soil Loss Equation). Hasil penelitian menunjukkan Nilai Erosi Aktual tertinggi berada pada lahan tanaman tahunan yaitu sebesar 6,941 ton/ha/tahun dengan kemiringan lereng 15-30%, sedangkan yang terendah pada lahan hutan sebesar 0,218 ton/ha/tahun dengan kemiringan lereng 8-15%. Dengan nilai Erosi yang Ditoleransikan tertinggi pada lahan tanaman tahunan yaitu sebesar 21,563 ton/ha/tahun dengan kemiringan lereng 8-15%, sedangkan yang terendah pada lahan tanaman semusim yaitu 8,9 ton/ha/tahun dengan kemiringan lereng 0-3%. Dengan Tingkat Bahaya Erosi Aktual yang terbesar pada lahan tanaman tahunan yaitu 0.357 dengan kemiringan lereng 15-30% dengan kriteria sangat ringan, sedangkan yang terendah pada lahan hutan yaitu 0.011 dengan kemiringan lereng 8-15% dengan kriteria sangat ringan.Kata Kunci: Erosi Tanah USLE, Kemiringan, Vegetasi

TRANSMISI TRANSGEN (PhGH) DAN PERFORMA PERTUMBUHAN IKAN LELE (Clarias gariepinus) TRANSGENIK F-3 Transmission of Transgene (PhGH) and Growth Performance Catfish (Clarias gariepinus) Transgenic F-3

AQUACOASTMARINE Vol 9, No 4 (2015): AQUACOASTMARINE
Publisher : Program Studi Manajemen Sumberdaya Perairan, Fakultas Pertanian Universitas Sumatera Utara

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Abstract

Fish increasing in aquaculture production requires the fulfillment of the need toaccelerate the productivity. Transgenesis technology with the introduction of transgenes(PhGH) can be performed to produce the fish that grow faster and has better performance.Transgene detection was performed using the PCR (Polymerase Chain Reaction) method andelectrophoresis using seed of transgenic catfish F-3. Furthermore, the observation of theperformance of catfish transgenic F-3 by measuring the rate of fertilization (the number offertilized eggs / total eggs), hatchability rate (the number of hatched eggs / number offertilized eggs), the survival rate (the number of early fish / amount of fish end), theperformance of growth (weight average transgenic F-3 / weight average non-transgenic) andfeed efficiency (absolute growth rate / daily feed intake). Results indicate that thetransmission rate ranged from 5-75% with an average transmission in the female transgenikF-2 by 2.5% (15/600) and 14.4% (75/520) in the male transgenik F-2. Weight growth rate of1.7 fold compared with non-transgenic. F-3 transgenic catfish has a degree of fertilization0.37% smaller and has a hatching 4% higher than the non-transgenic. Transgenic catfish feedefficiency higher than non-transgenic This shows that transgenic catfish has betterperformance compared with non-transgenic.Keywords: Transgenic catfish F-3, transgene (PhGH), transmission, Polymerase ChainReaction, growth performance

STUDI KUALITAS PERAIRAN SEBAGAI ALTERNATIF PENGEMBANGAN BUDIDAYA IKAN DI SUNGAI KEUREUTO KECAMATAN LHOKSUKON KABUPATEN ACEH UTARA PROVINSI NANGGROE ACEH DARUSSALAM

AQUACOASTMARINE Vol 10, No 5 (2015): JURNAL AQUACOASTMARINE
Publisher : Program Studi Manajemen Sumberdaya Perairan, Fakultas Pertanian Universitas Sumatera Utara

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Abstract

Rivers can be used as sources of drinking water and fulfillment of daily life, is also used foraquaculture. To implement an aquaculture activities, the river waters are used as aquaculturemust meet the requirements of physical parameters, chemical parameters and biologicalparameters of water. It is necessary to study the quality of the waters to determine thepotential for development of aquaculture in River Keureuto. To determine the quality of thewaters of the River Keureuto for aquaculture activities is by comparing the quality of thewaters of the River Keureuto that have been studied with the quality standard PP. No. 822001 with storet method. This study was conducted in March-May 2015 in Keureuto River.The method used is purposive sampling method. Samples were taken at 3 stations. Physicaland chemical parameters river waters keureto based Quality Standard PP. No. 82 2001 belongto the quality standard of Grade III, where the waters of the River Keureto still appropriate todo aquaculture.Keywords : Keureuto River, Aquaculture, Physics Parameter Water, Quality of Water,Methods Storet