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All Journal AGRIKA Planta Tropika Megasains Depik Jurnal Ilmu-Ilmu Perairan, Pesisir, dan Perikanan
Pristiwantoro, Eko Cahyo
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Agriculture, Biological Sciences & Forestry Earth & Planetary Sciences Education Engineering

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Kajian Aktivitas Infeksi Rhizobium sp. Indigenus Pada Kerandang (Pueraria phaseoloides) Triwahyuningsih, Nike; Pristiwantoro, Eko Cahyo; Utari, Lilik
PLANTA TROPIKA: Jurnal Agrosains (Journal of Agro Science) Vol 1, No 2 (2005)
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/pt.v1i2.3121

Abstract

Kudzu, a kind  of  legume   cover  crops  (LCC),   plays  important   roles  in  soil and  water conservation. It is effective  for  inhibiting  erotion,  compaction  and leaching  of nutrients,  as well as to suppress weeds.  Plants growing with legume  ground covers usually show  better nutrition,   growth and yield. Recently,  this cover crops have been widely  used to prevent  the negative effects  and to improve  soil physical  and nutritional  characteristics. As a legume,  bacterial  inoculation   is to enhance  the infection and nodulation activity. A research  to observe  the role of indigenous  Rhizobium   on infection and nodulation  activity of kudzu was carried  out in September  till December 2004.  The research  was done in Regosol  volcanic  soil in Tlatar  Village  of Sawangan in Magelang district of Central  Java. A pot experiment   was arranged in 4x2 factorial    completely   randomized   design  which  was repeated   three times.   The  seedling   innoculation   with  root  nodules  endophytic   bacteria   was  to increase  nodulation  and to enhance  Kudzu  plant growth.   The seedlings  were inoculated  with  1, 2 and 3 ml/pot of grinded  root nodules  of wild plants  containing  endophytic  Rhizobium  sp.  The wild kudzu  plants were taken  from  coastal  sandy  land  of southern   Yogyakarta.   All treated seedlings were planted  in a sterilized  medium  to be compared  to the unsterilized  one in order to examine  the role of indigenous  bacterias. Observation  on bacterial infection activity, nodulation,  and plant growth were taken  at week  4, 6, 8, and  10. All the  datas  were  variance   analyzed   and the  treatments average  were  tested  with 5% level  of Duncan's multiple range test. The  results  showed  that  application   of 2 ml/pot  of innoculum significantly   increased  the infection  activity, nodulation  and plant growth. Sterilized  soil decreased  the infection  activity.   Since the innoculation  of endophytic Rhizobium  sp.  in unsterilized  soil significantly   increased the infection actifity,  nodulation  and plant growth,  so the indigenous  Rhizobium sp. in rhizhosfer  was needed to sinergisticaly  worked  well with inoculum  to increase  infection  activities   and root nodulation.
Kajian Aktivitas Infeksi Rhizobium sp. Indigenus Pada Kerandang (Pueraria phaseoloides) Triwahyuningsih, Nike; Pristiwantoro, Eko Cahyo; Utari, Lilik
PLANTA TROPIKA: Jurnal Agrosains (Journal of Agro Science) Vol 1, No 2 (2005)
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/pt.v1i2.3121

Abstract

Kudzu, a kind  of  legume   cover  crops  (LCC),   plays  important   roles  in  soil and  water conservation. It is effective  for  inhibiting  erotion,  compaction  and leaching  of nutrients,  as well as to suppress weeds.  Plants growing with legume  ground covers usually show  better nutrition,   growth and yield. Recently,  this cover crops have been widely  used to prevent  the negative effects  and to improve  soil physical  and nutritional  characteristics. As a legume,  bacterial  inoculation   is to enhance  the infection and nodulation activity. A research  to observe  the role of indigenous  Rhizobium   on infection and nodulation  activity of kudzu was carried  out in September  till December 2004.  The research  was done in Regosol  volcanic  soil in Tlatar  Village  of Sawangan in Magelang district of Central  Java. A pot experiment   was arranged in 4x2 factorial    completely   randomized   design  which  was repeated   three times.   The  seedling   innoculation   with  root  nodules  endophytic   bacteria   was  to increase  nodulation  and to enhance  Kudzu  plant growth.   The seedlings  were inoculated  with  1, 2 and 3 ml/pot of grinded  root nodules  of wild plants  containing  endophytic  Rhizobium  sp.  The wild kudzu  plants were taken  from  coastal  sandy  land  of southern   Yogyakarta.   All treated seedlings were planted  in a sterilized  medium  to be compared  to the unsterilized  one in order to examine  the role of indigenous  bacterias. Observation  on bacterial infection activity, nodulation,  and plant growth were taken  at week  4, 6, 8, and  10. All the  datas  were  variance   analyzed   and the  treatments average  were  tested  with 5% level  of Duncan's multiple range test. The  results  showed  that  application   of 2 ml/pot  of innoculum significantly   increased  the infection  activity, nodulation  and plant growth. Sterilized  soil decreased  the infection  activity.   Since the innoculation  of endophytic Rhizobium  sp.  in unsterilized  soil significantly   increased the infection actifity,  nodulation  and plant growth,  so the indigenous  Rhizobium sp. in rhizhosfer  was needed to sinergisticaly  worked  well with inoculum  to increase  infection  activities   and root nodulation.
Pemanfaatan citra satelit Landsat 5 untuk menganalisis kejadian longsor Mei 2008 di Desa Paya Ateuk - Aceh Selatan Pristiwantoro, Eko Cahyo
Megasains Vol 7 No 1 (2016): Megasains Vol. 7 No.1 Tahun 2016
Publisher : Stasiun Pemantau Atmosfer Global Bukit Kototabang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.46824/megasains.v7i1.205

Abstract

Tulisan ini membahas penggunaan citra satelit landsat 5 multitemporal untuk menganalisis perubahan lahan akibat kejadian longsor di Paya Ateuk Aceh Selatan pada Mei 2008. Citra satelit yang di gunakan adalah citra tahun 2007 dan 2009. Metode change vector analisis (CVA) dan image differencing dengan analisis komponen utama kehijaua, kecerahan dan kebasahan dan komponen indeks vegetasi NDVI, BI dan NDWI di gunakan dalam jurnal ini. Diketahui bahwa perubahan lahan akibat longsor bisa di deteksi menggunakan metode CVA dan image differencing, metode CVA dapat digunakan untuk stratifikasi berbagai jenis perubahan tutupan lahan akibat tanah longsor. Menggunakan klasifikasi multispektral komponen NDVI diketahui bahwa luas lahan terbuka akibat longsor adalah 1.170 m2, yaitu dengan panjang longsoran 1.823 m, pada slope ata kemiringan lahan 25-40% hingga >40 %
HUBUNGAN KECEPATAN ANGIN DAN EVAPOTRANSPIRASI TERHADAP PERTUMBUHAN DAN PRODUKSI TANAMAN SORGUM (Sorghum bicolor L.Moench) Asnita, Desi; Adnan, Adnan; Juanda, Boy Riza; Pristiwantoro, Eko Cahyo; Haiqal, Muhammad
Agrika Vol. 18 No. 2 (2024)
Publisher : Badan Penerbitan Universitas Widyagama Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31328/ja.v18i2.6493

Abstract

ABSTRAK           Unsur iklim erat hubungannya dengan cuaca yang dapat menurunkan suatu usaha budidaya. Salah satu unsur iklim yang berpengaruh terhadap pertumbuhan dan produktivitas tanaman yaitu angin. Kecepatan angin memegang peran penting dalam evapotranspirasi, karena sebanding dengan evapotranspirasi. Data evapotranspirasi digunakan untuk kepentingan sumber daya air dan menghitung kesetimbangan air khususnya keperluan penentuan kebutuhan air bagi tanaman dalam periode pertumbuhan dan produksi tanaman sorgum. Penelitian ini bertujuan untuk menentukan bagaimana kecepatan angin dan evapotranspirasi mempengaruhi pertumbuhan dan produksi tanaman sorgum. Penelitian dilakukan di lapangan percobaan Stasiun Klimatologi BMKG Aceh, Aceh Besar. Metode penelitian yang digunakan meliputi analisa regresi linier berganda, uji T, uji F, koefisien korelasi dan koefisien determinasi. Parameter penelitian meliputi tinggi tanaman, jumlah daun, berat basah/tanaman dan berat basah/plot. Hasil penelitian menunjukkan bahwa kecepatan angin berpengaruh terhadap bobot basah tanaman dan bobot basah/plot. Evapotranspirasi berpengaruh secara parsial terhadap tinggi tanaman, jumlah daun dan bobot basah/plot. Hasil analisa uji F simultan menunjukkan bahwa kecepatan angin dan evapotranspirasi memiliki pengaruh secara simultan terhadap tinggi tanaman. Kecepatan angin menunjukkan hubungan yang kuat terhadap tinggi tanaman, jumlah daun, dan bobot basah/plot, serta memiliki hubungan yang cukup berarti terhadap terhadap produksi bobot basah tanaman/plot.  ABSTRACT           Climate elements are closely related to weather which can reduce a cultivation business. One of the climate elements that influences plant growth and productivity is wind. Wind speed plays an important role in evapotranspiration, because it is proportional to evapotranspiration. Evapotranspiration data is used for water resources purposes and calculating water balance, especially for determining water needs for plants during the growth and production period of sorghum plants. This research aimed to determine how wind speed and evapotranspiration affect the growth and production of sorghum plants. The research was carried out at the experimental field of the BMKG Aceh Climatology Station, Aceh Besar. The research methods used include multiple linear regression analysis, T test, F test, correlation coefficient and coefficient of determination. Research parameters included plant height, number of leaves, wet weight/plant and wet weight/plot. The results showed that wind speed had an effect on plant wet weight and wet weight/plot. Evapotranspiration partially influences plant height, number of leaves and wet weight/plot. The results of the simultaneous F test analysis showed that wind speed and evapotranspiration had a simultaneous influence on plant height. Wind speed showed a strong relationship with plant height, number of leaves, and fresh weight/plot, and had a significant relationship with the production of fresh weight of plants/plot.  
The influences of the Indian Ocean Dipole (IOD) on rainfall in South Aceh Permatasari, Ratna; Ilhamsyah, Yopi; Purnawan, Syahrul; Setiawan, Ichsan; Ramadhaniaty, Mutia; Sutarni, Sutarni; Pristiwantoro, Eko Cahyo
Depik Vol 11, No 3 (2022): DECEMBER 2022
Publisher : Faculty of Marine and Fisheries, Universitas Syiah Kuala

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13170/depik.11.3.25984

Abstract

This study aimed to examine the influences of the Indian Ocean Dipole (IOD) on rainfall in three districts in South Aceh. The analysis was undertaken using Dipole Mode Index (DMI) data and five years of rainfall (2016 to 2020) in West Labuhan Haji, Tapak Tuan, and Bakongan areas. This research employed a correlation analysis and the Principal Component Analysis, followed by Cluster Analysis to investigate the relationship between IOD and rainfall at the study location. The negative IOD occurred in 2016, and the positive IOD occurred in 2017, 2018, 2019, and 2020. The strongest positive DMI was in October 2019 (1.123C), while the strongest negative DMI was in July 2016 (0.661C). Generally, the sub-districts of West Labuhan Haji, Tapak Tuan, and Bakongan always have high rainfall. The highest rainfall in West Labuhan Haji was recorded in January 2017 (1014 mm/month), in Tapak Tuan in November 2017 (1073 mm/month), and in Bakongan in July 2020 (605 mm/month). The correlation between DMI and rainfall in the three locations shows different findings. Although it was very small, the IOD affected the rainfall in West Labuhan Haji, Tapak Tuan, and Bakongan. In West Labuhan Haji, the highest correlation was in lag 1 (0.188); in Tapak Tuan, the highest correlation was in lag 2 (0.156), while in Bakongan, the highest correlation was in lag 2 (-0.191). The correlations in these three locations are considered weak. Thus, the IOD is not the main factor affecting the rainfall in West Labuhan Haji, Tapak Tuan, and Bakongan. As South Aceh is located in windward, the orographic effect may influence high rainfall in this region.Keywords:DMIRainfallPrincipal component AnalysisWest Labuhan HajiTapak TuanBakongan
Co-Authors Adnan Adnan Asnita, Desi Haiqal, Muhammad Ichsan Setiawan Juanda, Boy Riza Mukhamad Najib Nike Triwahyuningsih Permatasari, Ratna Ramadhaniaty, Mutia Sutarni, Sutarni Syahrul Purnawan Utari, Lilik Yopi Ilhamsyah