Survey Dan Pemetaan Status Hara-P Di Kecamatan Kabanjahe Kabupaten Karo

The research of survey and mapping nutriens status of P2O5 at Kabanjahe sub-district, regensi Karo, aims to determine the spread of the availability of P2O5 in agricultural areas for plants. The survey was conducted using a free grid survey methode with with density 6.25 ha each of the grid and analysis of P2O5 content of 25% HCl extract. Analysis of the levels of P2O5 done in the laboratory of Research and Technology of the North Sumatra University, Medan. The results showed that the P2O5 classified into 5 criteria such as; very low 18.74 ha, 10 ha Low, Medium 70 ha, 140 ha of high and very high 343.75 ha. From the results obtained by laboratory analysis of soil samples with the highest P2O5 content is 2,376 % and lowest content is 0,016 %

Survei Dan Pemetaan Unsur Hara N, P, K, Dan Ph Tanah Pada Lahan Sawah Tadah Hujan Di Desa Durian Kecamatan Pantai Labu

The objective of this research are to survey and to map the nutrients which is nitrogen (N),phosphate (P), and potassium (K) and the soil pH of rain fed lowland in Desa Durian KecamatanPantai Labu. The soil analysis was conducted in Research and Technology Laboratory inAgricultural Faculty of North Sumatra University on July – November 2013. The researchconducted the survey grid method semi-detailed lavel with 1 sample each 250 meter observationdensity. For the nutrient the researcher used Khejdhal method for soil total nitrogen, Extraction HCl25% for soil Potential phosphate, extraction 1 N NH4OAc pH 7 for soil potassium exchange, forsoil pH the researcher used electrometric method, and the result will be interpreted on nutrientstatus map. The result showed that total nitrogen is classified into two status, low nitrogen (582,048Ha) and medium nitrogen (167,952 Ha). Potential phosphate is classified into very low status (750Ha). And potassium exchange is classified into three status, medium potassium (137,202 Ha), highpotassium (515,303 Ha) and very high potassium (97,495 Ha). Soil pH classified into aciditytendency

Pengujian Media Tanam Kompos Dan Residu Sampah Rumah Tangga Terhadap Basa Tukar, Ktk, Kb Dan Produksi Tanaman Sawi (Brassica Juncea L. Czern) Di Lahan Pekarangan Kec. Sunggal

The Study to evaluate the effect compost of household waste as growing media and the residual ofhousehold waste pit on the availability of KTK, KB and the production of mustard (Brassica junceaL. Czern) corp in yard. This research was conducted in the compost yard in Desa Sei SemayangKecamatan Sunggal Kabupaten Deli Serdang and in the laboratory of Agricultural Faculty ofUniversity of North Sumatra. The design of this research were non-factorial random design which isconsisting of 9 treatments with 3 replications. The treatment are M1 (100% soil), M2 (75% soil +25% compost), M3 (50% soil + 50% compost), M4 (25% soil + 75% compost), M5 (75% soil +25% residues of the household waste pit), M6 (50% soil + 50% residues of the household wastepit), M7 (25% soil + 75% residues of the household waste pit), M8 (50% compost+ 50% residues ofthe household waste pit), M9 (100% residues of the household waste pit). The result is that researchas household waste compost and residues of the household waste pit and the combination of both,very significantly increased the K-dd, Base Saturation of the soil as well as the production of thewet weight mustard plant and not significant to Ca, Mg and Na contensts

Pemberian Zeolit Dan Pupuk Kalium Untuk Meningkatkan Ketersediaan Hara K Dan Pertumbuhan Kedelai Di Entisol

The Application of Zeolite and Potassium Fertilizer to Increase The Avaibility of PotassiumNutrient and Soy Growth in Entisols. Suvervised by Hamidah Hanum and Gantar Sitanggang.Theobjective of this research were: 1) determined of zeolite dosage that improved the soil chemistryproperties, 2) determinated zeolite and potassium fertilizer dosage that effected the avaibility ofpotassium and the soy growth in Entisols. The research consisted of two experiment, the first onewas the experiment of zeolite incubation, and second one was the experiment of zeolit andpotasium fertilizer. The design experiment of the first research was completely randomized designand the second one was block randomized design- factorial. The result showed that in the firstexperiment, zeolite wich incubation until 7.5 ton/hectare incerease CEC significanly, but didn\u27teffect the soil pH and K-exchangable. Besed the second experiment, it was know that theinteraction effect of zeolit and potasium fertilizer aplication increased potassium nutrient the plant,which the best treatment was zeolite aplication 5 ton/ hectare and potasium fertilizer 150 kg/hectare

Evaluasi Sifat Kimia Tanah Inceptisol Pada Kebun Inti Tanaman Gambir (Uncaria Gambir Roxb.) Di Kecamatan Salak Kabupaten Pakpak Bharat

Evaluation of Inceptisol soil chemical in Gambir Core Garden in the Sub district of Salak Pakpak Bharat District has been conducted from March 2013 to June 2013. This study aimed to evaluate the soil chemical (pH, N, P, K, CEC, Organic Carbon, Exchangable Aluminuim) based on land position on the Gambir Core Garden of Pakpak Bharat District. The method used in this research is descriptive method by conducting surveys and soil sampling based land position on the top of the hill, hillside and part of the valley. The results show the value of N and Organic Carbon are tends to rise in the valley compared to the top of the hill and the hillside. As for the value of CEC and Exchangable Aluminium are tend to rise on the hillside compared to to the top of the hill and the valley, while the value of pH, P and K are relatively same

Evaluasi Kesesuaian Lahan Untuk Tanaman Kopi Arabika (Coffea Arabica L Var Kartika Ateng ) Di Kecamatan Muara Kabupaten Tapanuli Utara

This research aims to evaluate the land suitability of coffea (Coffea arabica L.) in Muara Subdistrict of North Tapanuli Utara. This research use survey method From the results of the overlay from the map of soil types, map of topography, and climate, retrieved 3 (three) units of land use map. SPL 1 has a land area of 796 hectares, SPL 2 has a land area of 243 hectares, and SPL 3 has a land area of 619 hectares.With the Matching method, then retrieved the land suitability class actual and potensial class for coffea (Coffea arabica L.) on each of the SPL. At SPL 1 and SPL 2 are actual land suitability class S3 (wa,nr) while the potential land suitability class is S3 (wa) and at SPL 3 is actual land suitability class S3 (wa,nr,eh) while the potential land suitability class is S3 (wa). Potention of land for Arabic coffea in Muara Subdistrict is 1658 Ha

Aplikasi Pupuk Sp-36 Dan Pupuk Kandang Ayamterhadap Ketersediaan Dan Serapan Fosfor Serta Pertumbuhan Tanaman Jagung Pada Ultisol Kwala Bekala

The objective of this study about the application of SP - 36 fertilizer and chicken manure onphosphorus availability and uptake and growth of maize on Ultisols taken from Kwala Bekala. Theresearch was conducted in the screen house and Chemical and Soil Fertility Laboratory , Faculty ofAgriculture , University of North Sumatra . This study used randomized block designed whichconsist of 2 factors and 3 replications . The first factor is SP - 36 which consists of 4 levels : 1 . P0 (0 ) , 2 . P1 ( 50 ) , P2 ( 100 ) , P3 ( 150 ) and the second factor is chicken manure : 1 . A0 ( 0 ), 2 . A1( 25 ) , 3 . A2 ( 50 ) , 4 . A3 ( 75 ) . The results showed SP - 36 fertilizer application indicatedsignifican increased soil pH , P-plant uptake , plant height, dry weight and dry root plant, decreasedAl -exchangeable. Application of chicken manure significantly increased soil pH , soil C-organic, P- available soil , P-plant uptake , plant height , dry weight and dry root plant, and decreased Al -exchangeable . Interaction of SP - 36 fertilizer application and chicken manure significantlyincreased the root dry plant

Cyanobacterial Toxins as Allelochemicals with Potential Applications as Algaecides, Herbicides and Insecticides

Cyanobacteria (“blue-green algae”) from marine and freshwater habitats are known to produce a diverse array of toxic or otherwise bioactive metabolites. However, the functional role of the vast majority of these compounds, particularly in terms of the physiology and ecology of the cyanobacteria that produce them, remains largely unknown. A limited number of studies have suggested that some of the compounds may have ecological roles as allelochemicals, specifically including compounds that may inhibit competing sympatric macrophytes, algae and microbes. These allelochemicals may also play a role in defense against potential predators and grazers, particularly aquatic invertebrates and their larvae. This review will discuss the existing evidence for the allelochemical roles of cyanobacterial toxins, as well as the potential for development and application of these compounds as algaecides, herbicides and insecticides, and specifically present relevant results from investigations into toxins of cyanobacteria from the Florida Everglades and associated waterways

Comparing faceted and smoothed tool surface descriptions in sheet metal forming simulation

This study deals with different tool surface description methods used in the finite element analysis of sheet metal forming processes. The description of arbitrarily-shaped tool surfaces using the traditional linear finite elements is compared with two distinct smooth surface description approaches: (i) Bézier patches obtained from the ComputerAided Design model and (ii) smoothing the finite element mesh using Nagata patches. The contact search algorithm is presented for each approach, exploiting its special features in order to ensure an accurate and efficient contact detection. The influence of the tool modelling accuracy on the numerical results is analysed using two sheet forming examples, the unconstrained cylindrical bending and the reverse deep drawing of a cylindrical cup. Smoothing the contact surfaces with Nagata patches allows creating more accurate tool models, both in terms of shape and normal vectors, when compared with the conventional linear finite element mesh. The computational efficiency is evaluated in this study through the total number of increments and the required CPU time. The mesh refinement in the faceted description approach is not effective in terms of computational efficiency due to large discontinuities in the normal vector field across facets, even when adopting fine meshes.The authors gratefully acknowledge the financial support of the Portuguese Foundation for Science and Technology (FCT) via the projects PTDC/EME-TME/118420/2010 and PEst-C/EME/ UI0285/2013 and by FEDER funds through the program COMPETE – Programa Operacional Factores de Competitividade, under the project CENTRO-07-0224-FEDER-002001 (MT4MOBI). The first author is also grateful to the FCT for the PhD grant SFRH/BD/69140/2010.info:eu-repo/semantics/publishedVersio