Articles

Found 26 Documents
Search

Dampak Perambahan Hutan Taman Nasional Lore Lindu Terhadap Fungsi Hidrologi Dan Beban Erosi (Studi Kasus Daerah Aliran Sungai Nopu Hulu, Sulawesi Tengah) Hidayat, Yayat; Sinukaban, Naik; Pawitan, Hidayat; Tarigan, Suria Darma
Jurnal Ilmu Pertanian Indonesia Vol 12, No 2 (2007): Jurnal Ilmu Pertanian Indonesia
Publisher : Institut Pertanian Bogor

Show Abstract | Original Source | Check in Google Scholar | Full PDF (251.751 KB)

Abstract

The research was proposed to identify rainforest conversion impact on hydrologic function and soil erosion, and its simulation using ANSWERS model. Surface runoff and soil erosion were measured in soil erosion plots and outlet of Nopu Upper Catchment. Rainforest conversion to agricultural lands were significantly increased soil erosions and surface runoffs. Soil erosion from maize and peanut rotation was higher 2061.8% than natural forest. It higher value also in intercroping young age cocoa, maize and cassava and maize were 2023.8% and 2012.3% respectively. While surface runoffs increased up to 761.7°/o on bare plot, 567.5% on medium age cocoa, 446.8°/o on young age cocoa, 415.1°/o on intercroping young age cacao, maize and cassavas, 405.9°/o on old cocoa, and 329.5% on intercroping young age cacao and cassavas. Crop and management factor (C factor) value is significantly corelated with outputs of ANSWERS model. Using daily daily C factors, the ANSWERS model performs well in predicting soil erosion which is showed by determination coefficent (Jr = 0.89), model efficiency (0.86), and average of percentage model deviations (24.1%). Whereas using USlE C factor, model accuracy lower which represented by model coefficient (0.40) and average of percentage model deviations (63.6%). Using daily C factors, ANSWERS model simulation indicates rainforest conversion into agricultural lands on Nopu Upper Catchment has caused soil and water loss 3190.5 ton/year and 115441.0 m3/year, respectively. Agroforestry system practices in agricultural lands which in line with reforestation in stream line and steep agricultural areas (slope> 40°/o) was effective to reduce soil erosions up to 77.6°/o.
Pengaruh bobot isi tanah terhadap sifat fisik tanah dan perkecambahan benih kacang tanah dan kedelai Haridjaja, Oteng; Hidayat, Yayat; Maryamah, Lina Siti
Jurnal Ilmu Pertanian Indonesia Vol 15, No 3 (2010): Jurnal Ilmu Pertanian Indonesia
Publisher : Institut Pertanian Bogor

Show Abstract | Original Source | Check in Google Scholar | Full PDF (1479.699 KB)

Abstract

Soil physical properties can affect to seed germination and plant growth. Soil compaction will degrade soil physical properties which in term will affect to root penetration and development in the soil. The improvements of soil physical properties is required to ensure seed germination and plant growth such treatment to maintain soil bulk density is quite low. The purpose of this research is to study the influence of soil compaction (soil bulk density) to soil physical characteristics and seed germination of peanuts and soybean.This research used Jasinga Podsolik Soil, conducted at Soil Physical Laboratory, Department of Soil Science and Land Resources, Faculty of Agriculture IPB, and Greenhouse of Center of Biological Resources and Biotechnology, Research and Community Services Agency, IPB(March-November 2009). Completed random design was used as experimental design and Duncans Multiple Range Test (DMRT) was used to identify the effect of treatment. The bulk density results of the research showed that the increasing of soil bulk density (soil compaction) had significantly affect on pF curves, permeability rate, and soil resistance before or after planting. For peanut, soil compaction significantly affect to plant height and root length. Soil compaction did not significantly affect on stem diameter, number of leaves, canopy or root biomass. For soybean, the influence of soil compaction had significantly affect just only on plant height. Stem diameter, number of leaves, root length or root and canopy biomasses were not affected by soil compaction.Keywords : Peanut, seed germination, soil bulk density, soil bulk density, soybean.
Pengaruh Bobot Isi Tanah Terhadap Sifat Fisik Tanah Dan Perkecambahan Benih Kacang Tanah Dan Kedelai (Effect Of Soil Bulk Density On Soil Physical Properties And Seed Germinations Of Peanut And Soybean) Haridjaja, Oteng; Hidayat, Yayat; Maryamah, Lina Siti
Jurnal Ilmu Pertanian Indonesia Vol 15, No 3 (2010): Jurnal Ilmu Pertanian Indonesia
Publisher : Institut Pertanian Bogor

Show Abstract | Original Source | Check in Google Scholar | Full PDF (518.951 KB)

Abstract

Soil physical properties can affect to seed germination and plant growth. Soil compaction will degrade soil physical properties which in term will affect to root penetration and developement in the soil. The improvements of soil physical properties is required to ensure seed germination and plant growth such as treatment to maintain soil bulk density is quite low. The purpose of this research is to study the influence of soil compaction (soil bulk density) to soil physical characteristics and seed gemination of peanuts and soybean. This research used Jasinga Podsolik soil, conducted at Soil Physical Laboratory, Departement of Soil Science and Land Resources, Faculty of Agriculture IPB. and Greenhouse of Center of Biological Resources and Biotechnology, Research and Community Service Agency, IPB (March-November 2009). Completed random design was used as experimental design and Duncans Multiple Range Test (DMRT) was used to identify the effect of treatment. The bulk density result of the research showed that the increasing of soil bulk density (soil compaction) had significantly affect on pF curves, permeability rate, and soil resistance before or after planting. For peanuts, soil compaction significantly affect to plant height and root length. Soil compaction did not significantly affect of stem diameter, number of leaves, canopy or root biomass. For soybean, the influence of soil compaction did not significantly affect just only on plant height. Stem diameter, number of leaves, root length or root and canopy biomasses were not affected by soil compaction.
PENDIDIKAN DALAM PERSPEKTIF IBNU KHALDUN HIDAYAT, YAYAT
Jurnal Pendidikan Islam AL-ILMI Vol 2, No 1 (2019): MEI
Publisher : Jurnal Pendidikan Islam AL-ILMI

Show Abstract | Original Source | Check in Google Scholar | Full PDF (180.255 KB)

Abstract

Abstract : Ibn Khaldun is one of the leaders of Islamic thinkers who has a great influence in the development of science. Ibn Khaldun is better known as a historian and social expert. As stated in his Muqoddimah work, besides having the concept of education in an educational perspective is the result of the ideas of Ibn Khaldun who emphasized education. Ibn Khaldun's view of education rests on concepts and philosophical-empirical approaches. Through this approach, he provides direction to the vision of the ideal and practical goals of Islamic education. Based on the results of research from the literature that has been done that Ibn Khaldun is a great figure in the Islamic world, who succeeded in contributing so much in the scientific world that exists in the world. The thoughts of Ibn Khaldun cannot be separated from the roots of Islamic thought. Ibn Khaldun considers that education is the essence of human existence. Ibn Khaldun argues that education seeks to give birth to a cultured society and strives to preserve the future existence of society. Ibn Khaldun's view of education rests on concepts and philosophical-empirical approaches. Through this approach, he provides direction to the vision of the ideal and practical goals of Islamic education. The challenge of education according to Ibn Khaldun is that education can create quality human resources, namely giving birth to a culture of society and trying to preserve and increase the existence of the next society.Keywords: Education, Ibnu Khaldun, Perspective
Perkembangan Bunga dan Buah pada Tegakan Benih Surian (Toona Sinensis Roem) Hidayat, Yayat
Agrikultura Vol 21, No 1 (2010)
Publisher : Agrikultura

Show Abstract | Original Source | Check in Google Scholar | Full PDF (2184.45 KB)

Abstract

Produktivitas buah pada tegakan benih dipengaruhi oleh persentase jumlah pohon induk yang berbunga, persentase keberhasilan buah mencapai ukuran dewasa, peran agen polinator, gangguan hama bunga, gangguan lingkungan ekstrim dan manajemen polinasi. Penelitian ini bertujuan untuk mempelajari perkembangan bunga dan buah surian (T. sinensis Roem) serta produktivitasnya pada tegakan benih surian. Pengamatan morfologi dan perkembangan dari bunga dan buah surian telah dilakukan pada tegakan benih surian berumur 15 tahun, di Kebun Percobaan Hutan Tanaman Industri (KPHTI) Unwim. Variabel yang diamati meliputi morfologi dan perkembangan bunga, morfologi dan perkembangan buah, serangga pengunjung bunga dan produktivitas buah. Hasil penelitian menunjukkan bahwa tahap perkembangan bunga mulai dari kelopak tertutup hingga membuka dan mahkota bunga mencapai ukuran panjang maksimal dibutuhkan waktu sekitar 3 minggu, sedangkan tahapan perkembangan dari buah muda hingga mencapai matang dan terpencar di pohon dibutuhkan waktu sekitar 5 bulan. Bunga surian termasuk tipe hermaprodit, sistem pembungaannya termasuk protandri dikogami.  Prosentase pohon induk yang berbuah mencapai 16 %–45 %, dengan potensi buah kering perpo-honnya mencapai 0,36–2,3 kg.  Kupu-kupu, lebah dan lalat merupakan agen polinator pada tegakan benih surian, sedangkan trips dan ulat merupakan hama bunga.
Pendugaan Parameter Genetik, Korelasi Antar Karakter Fenotipik serta Hubungan Kekerabatan Genetik Populasi Bibit Surian (Toona sinensis Roem) Hidayat, Yayat; Haeruman K., Murdaningsih; Amien, Suseno; Siregar, Iskandar Zulkarnaen
Indonesian Journal of Applied Sciences Vol 1, No 1 (2011)
Publisher : Universitas Padjadjaran

Show Abstract | Original Source | Check in Google Scholar | Full PDF (1161.454 KB)

Abstract

An  experiment to estimate genetic parameter, correlation among traits and genetic relationship of seedling population of Toona siensis Roem that progeny halfsib from 13 parent trees came from four sertified seed stands of surian in Java island was carried out in nursery et ex Faculty of Forestry Winayamukti University Jatinangor, from January until February 2010.  The experment  was arrenge in a randomized block design with four seed stand as treatments and five replications.  The observation was performed on 17 phenotipic  traits of surian seedling six month old after spin out.   The data were analyzed using anova, correlation, pricipal component analysis, and cluster analysis. The results showed that the characters have a large genetic variance, high heritability and high genetic advance were character of the total height, clear leave hight, the robustness of the stem, leaf length and leaf lamina shape. Characters that have a positive phenotypic and genotypic correlation and significant to the total height were clear leave height, colar diameter, leaf length, shoot length, number of leaves, length of leaflets, width of leaflets, distance first leaflet to petiol, and distance widest point of laminae to petiol. Characters that have a positive phenotypic and genotypic correlation and significant to the colar diameter were total height, shoot length, number of levaes, shoot length, number of leaves, length of leaflets, width of leaflets, distance first leaflet to petiol, and distance widest point of laminae to petiol. Group of seedlings from TBI Kendal has a closer genetic relationship to the group of seedlings from TBS Jatinangor, whereas the group of seedlings from TBI Sumedang have a closer genetic relationship with TBI Tasikmalaya.*****Penelitian yang bertujuan untuk menduga parameter genetik, korelasi antar karakter dan hubungan kekerabatan genetik populasi bibit dari keturunan halfsib 13 genotip pohon induk surian yang berasal dari empat populasi tegakan benih surian bersertifikat di Pulau Jawa telah dilakukan di persemaian eks Fakultas Kehutanan Unwim Jatinangor pada Januari hingga Juni 2010. Penelitian menggunakan rancangan acak kelompok dengan empat populasi tegakan benih sebagai perlakuan yang diulang lima kali. Pengamatan dilakukan terhadap 17 karakter fenotipik pertumbuhan bibit surian umur enam bulan setelah sapih. Analisis data dilakukan melalui analisis ragam, analisis korelasi, analisis komponen utama dan analisis klaster. Hasil penelitian menunjukan bahwa  karakter yang memiliki varians genetik luas, heritabilitas tinggi dan kemajuan genetik tinggi  adalah karakter tinggi total, tinggi bebas daun, kekokohan batang, panjang daun dan bentuk lamina daun. Karakter yang memliki korelasi fenotipik dan genotipik searah dan nyata dengan karakter tinggi total adalah karakter tinggi bebas daun, diameter batang, panjang daun, panjang pucuk, jumlah daun, panjang anak daun, lebar anak daun, jarak anak daun pertama terhdap petiol, panjang petiol dan jarak titik lamina terlebar terhadap petiol. Karakter yang memiliki korelasi fenotipik dan genotipik searah dan nyata dengan karakter diameter batang bibit adalah karakter tinggi total, panjang pucuk, jumlah daun, panjang anak daun, lebar anak daun, jarak anak daun pertama terhadap petiol, dan jarak titik lamina terlebar terhadap petiol. Kelompok bibit asal TBI Kendal memiliki hubungan kekerabatan genetik yang lebh dekat dengan kelompok bibit asal TBS Jatinangor, sedangkan kelompok bibit asal TBI Sumedang memiliki hubungan kekerabatn genetik lebih dekat dengan TBI Tasikmalaya.
Respon Pertumbuhan Akar Tanaman Sengon (Paraserianthes falcataria) terhadap Kepadatan dan Kandungan Air Tanah Podsolik Merah Kuning Rusdiana, Omo; Fakuara, Yahya; Kusmana, Cecep; Hidayat, Yayat
JURNAL MANAJEMEN HUTAN TROPIKA Vol 6, No 2 (2000)
Publisher : Bogor Agricultural University

Show Abstract | Original Source | Check in Google Scholar | Full PDF (296.556 KB)

Abstract

The purpose of this experiment was to investigate the influence of soil compaction and water content on root development of 6 month old sengon seedling. The experiment was arranged 3 x 3 factorial experiment within a complete randomized design and 3 replications. The factor number one was soil compaction and factor number two was soil water content. The soil compaction factor consists of 3 levels, which are 1,5 g/cm3 (A1), 1,2 g/cm3 (A2), and 0,9 g/cm3 (A3) respectively, while the soil water content also consists of 3 levels, which are 60,41 % (B1), 49,64% (B2), and 42,86 % (B3) for each level. The parameters were counted which are root number, diameter, root length, biomass, surface area, and root length density. The result was that soil compaction treatment has a significant influence to root number, root length, biomass, surface area, and root length density. On the other hand the soil water content treatment on pF 2,54 until 3,5 and interaction soil compaction and water content have no influence to root number, diameter, root length, biomass, surface area, and root length density. Root number, diameter, length, biomass, surface area and root length density were increased accordingly to the age of the seedling, but the increasing of soil compaction has decreased to the number, length, root length, biomass, surface area and root length density. The secondary root was found more larger than the primary and the tertiary root in term of the root length, surface area and root length density.
Watershed Modeling with ArcSWAT and SUFI2 In Cisadane Catchment Area: Calibration and Validation of River Flow Prediction Ridwansyah, Iwan; Pawitan, Hidayat; Sinukaban, Naik; Hidayat, Yayat
International Journal of Science and Engineering Vol 6, No 2 (2014)
Publisher : Chemical Engineering Diponegoro University

Show Abstract | Original Source | Check in Google Scholar | Full PDF (1370.72 KB)

Abstract

Increasing of natural resources utilization as a result of population growth and economic development has caused severe damage on the watershed. The impacts of natural disasters such as floods, landslides and droughts become more frequent. Cisadane Catchment Area is one of 108 priority watershed in Indonesia. SWAT is currently applied world wide and considered as a versatile model that can be used to integrate multiple environmental processes, which support more effective watershed management and the development of better informed policy decision. The objective of this study is to examine the applicability of SWAT model for modeling mountainous catchments, focusing on Cisadane catchment Area in west Java Province, Indonesia. The SWAT model simulation was done for the periods of 2005 – 2010 while it used landuse information in 2009. Methods of Sequential Uncertainty Fitting ver. 2 (SUFI2) and combine with manual calibration were used in this study to calibrate a rainfall-runoff. The Calibration is done on 2007 and the validation on 2009, the R2 and Nash Sutchliffe Efficiency (NSE) of the calibration were 0.71 and 0.72 respectively and the validation are 0.708 and 0.7 respectively. The monthly average of surface runoff and total water yield from the simulation were 27.7 mm and 2718.4 mm respectively. This study showed SWAT model can be a potential monitoring tool especially for watersheds in Cisadane Catchment Area or in the tropical regions. The model can be used for another purpose, especially in watershed management.
Pencirian Debit Aliran Sungai Citarum Hulu Hidayat, Yayat; Murtilaksono, Kukuh; Wahjunie, Enni Dwi; Panuju, Diah Retno
Jurnal Ilmu Pertanian Indonesia Vol 18, No 2 (2013): Jurnal Ilmu Pertanian Indonesia
Publisher : Institut Pertanian Bogor

Show Abstract | Original Source | Check in Google Scholar | Full PDF (216.612 KB)

Abstract

Citarum is one of strategic rivers in West Java. In the upper part of this river, there are 3 large dams (Saguling, Cirata, and Jatiluhur) which operates hydroelectric power that supply ± 20% electricity needs of Java-Bali area. Run off discharge of the river are fluctuating widely so greatly affect the performance of electricity production, supply of irrigation, and household water in the downstream area. The research aims to identify character of river discharge of Citarum Hulu and its relation with land use changes and farm management. River discharge were analyzed at the inlet of Saguling dam in Kampung Nanjung and some stream monitoring stations located in Ciwidey, Cisangkuy, and Cikapundung-Gandok. River discharge was highly fluctuating. In the peak of rainy season the flow rate can reach 578 m3/sec which caused flooding in several area such as Majalaya, Banjaran, and Dayeuhkolot. In contrary, in dry season the flow was very low, about 2.7 m3/sec, causing drought, failure of rice harvest, and reduced water supply to hydropower plant of Saguling. In addition to affecting rainfall patterns, the flow rate fluctuations was also influenced by pattern of land use and management. Land utilization that was not in accordance with the land capability was the main cause of land degradation which in turn would decrease hydrology function of watershed to control river discharge in rainy season. Keywords: citarum upper watershed, land capability, land use, river discharge
KAJIAN DAMPAK PERUBAHAN PENGGUNAAN LAHAN TERHADAP DEBIT ALIRAN DAS CIUJUNG Sulaeman, Dede; Hidayat, Yayat; Rachman, Latief Mahir; Tarigan, Suria Darma
JOURNAL TEKNIK SIPIL DAN INFRASTRUKTUR Vol 4, No 2 (2014)
Publisher : JOURNAL TEKNIK SIPIL DAN INFRASTRUKTUR

Show Abstract | Original Source | Check in Google Scholar | Full PDF (542.907 KB)

Abstract

Ciujung Watershed is considered as one of major watershed in Banten Province related to floods that take place almost every year in the area. The study aims to assess landuse change and its influence on discharge. Watershed conditions such as precipitation, discharge, peak discharge, volume rate of discharge, and runoff were analyzed in two periods: 1999-2003 and 2004-2011. Landuse changes were analyzed in 8 years period (2003-2011) as well as its influence on discharge. Average annual precipitation in the period of 1999-2003 and 2004-2011 are 2370 and 2419 mm respectively. Average annual discharge in the period of 2004-2011 increased by 15% compared to the period of 1999-2003. Watershed conditions analysis indicates that Ciujung watershed quality decreased with increasing in surface runoff coefficient with values of 0.43 (period 1999-2003) and 0.48 (period 2004-2011). The study showed that there are several decreasing landuses during period 2003-2011 such as open land, natural forest, mixed dry land farming, secondary dry forest, primary dry forest, and dry land farming by 47.4; 14.3; 8.4; 2.9; 1.6 and 0.1% respectively. Several increasing land uses during the period including bush, plantations, settlements, and paddy field by 1,974.5; 5.5; 3.8 and 0.9% respectively. Keywords: discharge, land use change, peak discharge, runoff Ciujung Watershed is considered as one of major watershed in Banten Province related to floods that take place almost every year in the area. The study aims to assess landuse change and its influence on discharge. Watershed conditions such as precipitation, discharge, peak discharge, volume rate of discharge, and runoff were analyzed in two periods: 1999-2003 and 2004-2011. Landuse changes were analyzed in 8 years period (2003-2011) as well as its influence on discharge. Average annual precipitation in the period of 1999-2003 and 2004-2011 are 2370 and 2419 mm respectively. Average annual discharge in the period of 2004-2011 increased by 15% compared to the period of 1999-2003. Watershed conditions analysis indicates that Ciujung watershed quality decreased with increasing in surface runoff coefficient with values of 0.43 (period 1999-2003) and 0.48 (period 2004-2011). The study showed that there are several decreasing landuses during period 2003-2011 such as open land, natural forest, mixed dry land farming, secondary dry forest, primary dry forest, and dry land farming by 47.4; 14.3; 8.4; 2.9; 1.6 and 0.1% respectively. Several increasing land uses during the period including bush, plantations, settlements, and paddy field by 1,974.5; 5.5; 3.8 and 0.9% respectively. Keywords: discharge, land use change, peak discharge, runoff