Eka Tarwaca Susila Putra, Eka Tarwaca Susila
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Published : 46 Documents
Articles

Pertumbuhan, Produktivitas, dan Rendemen Minyak Kelapa Sawit di Dataran Tinggi Listia, Eka; Indradewa, Didik; Putra, Eka Tarwaca Susila
Jurnal Ilmu Pertanian Vol 18, No 2 (2015): August
Publisher : Faculty of Agriculture, Universitas Gadjah Mada jointly with PISPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (213.529 KB) | DOI: 10.22146/ipas.9087

Abstract

Penelitian ini bertujuan untuk mengetahui pertumbuhan, produktivitas dan rendemen minyak kelapa sawit yang ditanam pada dataran tinggi. Penelitian dilaksanakan pada empat lokasi penelitian dengan ketinggian tempat 50, 368, 693 dan 865 m dpl yang berada di wilayah Sumatera Utara. Penelitian disusun dalam Rancangan Acak Kelompok menggunakan kelapa sawit jenis tenera pada kelompok tanaman muda yang berumur 7 – 8 tahun. Hasil penelitian menunjukkan bahwa pertumbuhan tanaman kelapa sawit di dataran tinggi yang meliputi panjang rachis, indeks luas daun, bobot kering daun, tinggi tanaman, volume batang dan bobot kering batang memiliki nilai lebih tinggi dibandingkan tanaman kelapa sawit di dataran rendah. Produktivitas tertinggi mencapai 28,5 ton TBS/ha/tahun pada penanaman kelapa sawit di ketinggian 368 m dpl. Rendemen minyak tertinggi 25,9% dicapai pada ketinggian tempat 50 m dpl. Kandungan karoten tertinggi 590,8 ppm dan nilai indeks panen tertinggi 0,39 dicapai oleh tanaman kelapa sawit di dataran rendah dengan ketinggian 368 m dpl.
The Relationships Among Physiological Characters and Productivities of Nine PGL Clones in Medium Land Irmayanti, Ika; Indradewa, Didik; Putra, Eka Tarwaca Susila
Jurnal Ilmu Pertanian Vol 18, No 3 (2015): December
Publisher : Faculty of Agriculture, Universitas Gadjah Mada jointly with PISPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (70.588 KB) | DOI: 10.22146/ipas.8654

Abstract

The objectives of the study were to determine the relationships among the physiological characters and productivities of nine PGL clones in medium land. Field trial was arranged in a Randomized Complete Block Design (RCBD) single factor with three blocks as replications. The treatment was PGL clones, consisting of nine clones, namely PGL 1 PGL 3, 4 PGL, PGL 7, PGL 10, PGL 11, PGL 12, PGL 15, and PGL 17. The observations were done on several variables of physiological characters and productivities. Data were analyzed by using the Analysis of Variance (ANOVA) at 5% levels. If there were significant differences among the treatments, they will be analysed by Duncan Multiple Range Test (DMRT). The relationships among variables were determined using correlation analysis. Results showed that there were wide variations in the stomatal density and width openings  and also productivities among the nine PGL clones. Stomatal density and width openings have significant positive correlation with the productivity. PGL 12 and 15 with a denser of stomatal arrangement and wider stomatal openings have higher productivities when compared to other PGL clones, especially PGL 7 with the most loosely stomatal arrangement and narrower stomatal openings.
Kandungan Logam Berat Timbal (Pb) dan Pengaruhnya Pada Angsana (Pterocarpus indicus), Tanjung (Mimusops elengi), dan Asam Jawa (Tamarindus indica) di Jalan Lingkar Alun–Alun Yogyakarta Siregar, Suryana Riski; Irwan, Siti Nurul Rofiqo; Putra, Eka Tarwaca Susila
Vegetalika Vol 9, No 1 (2020)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (823.765 KB) | DOI: 10.22146/veg.42694

Abstract

Timbal (Pb) merupakan salah satu logam berat yang digunakan dalam bahan bakar kendaraan bermotor dan menjadi polutan. Adapun tujuan penelitian adalah mengetahui kandungan logam berat timbal (Pb) pada daun tanaman Angsana (Pterocarpus indicus), Tanjung (Mimusops elengi), dan Asam Jawa (Tamarindus indica) serta mengetahui pengaruhnya terhadap kandungan klorofil, kerapatan dan lebar bukaan stomata. Penelitian dilakukan dengan metode observasi, dimana daun tanaman sampel dipilih berdasarkan diameter batang batang tanaman. Data di uji ANOVA (analysis of varians) dan korelasi menggunakan R studio dan Microsoft excel. Kandungan timbal (Pb) pada tanaman tanjung (Mimusops elengi) 4,39 mg/kg, tanaman asam jawa (Tamarindus indica) 3,08 mg/kg), dan tanaman angsana (Pterocarpus indicus) 2,5 mg/kg. Kandungan timbal  (Pb) pada tanaman asam jawa tidak berbedanya tanaman tanjung dan angsana, namun kandungan timbal (Pb) pada tanaman angsana berbeda nyata dengan tanaman tanjung. Kandungan timbal (Pb) tidak berbeda nyata antar diameter batang tanaman. Pengaruh kandungan timbal (Pb) pada klorofil, lebar bukaan stomata, kerapatan stomata, dan biomassa pada tiga jenis tanaman menunjukkan hasil yang berbeda-beda. Pengaruh kandungan yang signifikan yaitu terhadap lebar bukaan stomata tanaman asam jawa. 
Analysis of The Growth of Oil Palm (Elaeis guineensis Jacq.) Exposed by Aluminum Toxicity and Silica as an Amelioration Ratnasari, Satiti; Putra, Eka Tarwaca Susila; Indradewa, Didik
Jurnal Ilmu Pertanian Vol 2, No 1 (2017): April
Publisher : Faculty of Agriculture, Universitas Gadjah Mada jointly with PISPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1586.381 KB) | DOI: 10.22146/ipas.11194

Abstract

Aluminum (Al) contained in acidic soil could become an obstacle for plant growth. The Al toxicity could inhibit root growth, water and nutrient absorption. One of the solution to overcome Al toxicity was by applying Silica (Si). The aim of this research was to study the impacts of Al to the growth activity of oil palm and to know the effects of Si to the growth activity of oil palm contaminated by Al. The factorial treatments were arranged in a complete random design with two factors. The first factor was Al toxicity, i.e. with and without Al, while the second factor was the application of Si that consisted of four levels (0, 32, 64, 96 gram per plant). some of variables included leaf area ratio (LAR), leaf area, net assimilation rate (NAR), relative growth ratio (RGR), plant height, and plant dry weight were observed. The result showed that Al toxicity decreased the LAR, leaf area, NAR, RGR, plant height, and plant dry weight. The application of Si 32 gram per plant increased leaf area ratio and was not significantly different from the application of 96 gram Si per plant. However, the application of Si to oil palm contaminated with Al did not affect to relative grow rate, but its application to normal plant would increase the relative growth ratio.
Root Morphology of Eight Hybrid Oil Palms Under Iron (Fe) Toxicity Nurmalasari, Aprilia Ike; Putra, Eka Tarwaca Susila; Yudono, Prapto
Jurnal Ilmu Pertanian Vol 1, No 1 (2016): April
Publisher : Faculty of Agriculture, Universitas Gadjah Mada jointly with PISPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (8195.749 KB) | DOI: 10.22146/ipas.11254

Abstract

The research aims to study the change of morphology root characters of eight hybrid oil palms under iron toxicity (Fe). Field experiment done in arranged in a Randomized Complete Block Design (RCBD) two factors and three blocks as replications. The first factor was Fe concentration. It consists of two levels which are concentration 0µ.g-1 and concentration 600 µg.g-1 Fe. The second factor is the hybrid of oil palms which consists of eight hybrid oil palms as Yangambi, Avros, Langkat, PPKS 239, Simalungun, PPKS 718, PPKS 540 and Dumpy. Fe was applied by pouring FeSO4 solvent for 600 µg.g-1 500 ml.-1plant.-1day-1 on two months of plants after transplanting in the main nursery. Data were collected on root morphology and plant dry weight The data were analysis of variance (ANOVA) at 5% significanly, followed by Duncan's multiple range test (DMRT). The relationships by among variables were determined by correlation analysis. The results showed that Fe concentration 600 µg.g-1 inhibits relatively root growth rate, narrows surface area, reduces the diameter, and shrinks root volume of all hybrid oil palms tested. The slowing relatively root growth rate, narrowing of root surface area and root diameter also root volume shrinkage due to Fe stress. It was also shown that the dry weight of plants was inhibit by existing of Fe toxicity.
Effects of Pyraclostrobin on Growth and Yield of Curly Red Chili (Capsicum Annum L.) Hardiansyah, Arizal Nur; Sulistyaningsih, Endang; Putra, Eka Tarwaca Susila
Jurnal Ilmu Pertanian Vol 2, No 1 (2017): April
Publisher : Faculty of Agriculture, Universitas Gadjah Mada jointly with PISPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1500.879 KB) | DOI: 10.22146/ipas.12841

Abstract

Curly red chili was one of vegetable commodities in Indonesia used for seasoning of home cuisine, food industry, and pharmaceutical industry. Curly red chili cultivation needed fungicide to prevent fungal disease. Pyraclostrobin was a fungicide which could overcome fungal attack and improve plant growth. This research was conducted to study the effectiveness of pyraclostrobin application on vegetative growth of curly red chili plant. Research had been done in farmer’s land in Kemiriombo Village, Dukun Sub District, Muntilan District, Magelang Regency from December 2013 to June 2014. The treatments were assigned in the Randomized Complete Block Design with three replications. The treatments consisted of P1: pyraclostrobin doses 1.5 kg ha-1, 30 and 90 days after planting (dap), P2: pyraclostrobin 1.5 kg ha-1 at 30, 60, and 90 dap, P3: pyraclostrobin 1.5 kg ha-1, at 15, 30, 60, and 90 dap, P4: pyraclostrobin 3 kg ha-1, at 30 and 90 dap, P5: pyraclostrobin 3 kg ha-1, at 30, 60, and 90 dap, P6: pyraclostrobin 3 kg ha-1, at 15, 30, 60, and 90 dap, and P0: control (no treatment). Data were analyzed by orthogonal contrast test with α=5%. The result indicated significant different in the dry weights of root, stem, leaf, and total yield at 12 weeks after planting; number of flower at 9-11 week after planting, 14 week after planting, and 18-21 week after planting; and number of fruits at 10-12 week after planting, 15, and 16 week after planting. The application of pyraclostrobin at all dosages could increase IAA content. The numbers of flower and fruit were influenced by the increasing of IAA content in plant tissue, but did not affect the yield.
Proline Activity and Growth of Oil Palm affected by Aluminium Toxicity and Silica as Ameliorant Khoiriyah, Annisa; Putra, Eka Tarwaca Susila; Yudono, Prapto
Jurnal Ilmu Pertanian Vol 1, No 1 (2016): April
Publisher : Faculty of Agriculture, Universitas Gadjah Mada jointly with PISPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1189.509 KB) | DOI: 10.22146/ipas.10786

Abstract

The research aims to investigate the effects of silica (Si) as an ameliorant on the proline compound concentration and the growth response of oil palm exposed to aluminum toxicity. The research was arranged in a complete randomized block design with 8 blocks as replications. The first factor was Al toxicity which consisted of two levels as without and with Al toxicity. Al toxicity treatment was applied by giving 300 ppm of Al concentrate along with watering activity regularly. The second factor was the application of silica which consisted of four levels as 0, 32, 64 g/plant. Proline and growth activities of leaf area, plant height, number of leaves, and dry weight were observed in the research. The data subjected to analysis of variance (ANOVA) at 5% test level. If the result of ANOVA showed significant differences among treatments, then the data would have been analyzed by Duncan’s Multiple Range Test (DMRT) at 5% test level. The results of the research provide information that Al toxicity increases proline compound in the plant tissues and decreases leaf area, plant height, number of leaves, and dry weight of Oil Palm. Applying Si at the level of 64 g/plant could increase proline concentrate and dry weight of oil palm exposed to A1 toxicity. Proline compound in the plant tissues did not have any correlation with the growth of oil palm. Thus, this case indicated that proline was a product and not a plant tolerant mechanism of Al toxicity.
Tanggapan Produktivitas Kelapa Sawit (Elaeis guineensis Jacq. ) terhadap Variasi Iklim W.P., Benny; Putra, Eka Tarwaca Susila; Supriyanta, Supriyanta
Vegetalika Vol 4, No 4 (2015)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (769.204 KB) | DOI: 10.22146/veg.23941

Abstract

Unsur iklim meliputi curah hujan, radiasi matahari, suhu udara dan kelembapan udara sangat berpengaruh terhadap pertumbuhan dan produksi tandan kelapa sawit. Penelitian ini bertujuan untuk mengetahui pengaruh individual maupun kombinasi dari variasi unsur tersebut terhadap produktivitas Tandan Buah Segar (TBS) maupun rendemen minyak kelapa sawit dan menentukan pola hubungan di antara variasi unsur iklim tersebut dengan produktivitas Tandan Buah Segar (TBS) dan rendemen minyak kelapa sawit. Penelitian dilakukan di Kebun Kelapa Sawit milik PT Asian Agri wilayah Sumatera Utara, Riau, dan Jambi, dengan pengumpulan data sekunder tahun 2005-2012 dari salah satu afdeling di wilayah perkebunan yang ada di Sumatra Utara, Riau, dan Jambi yang  meliputi curah hujan, suhu udara, kelembapan udara, dan radiasi matahari, produksi Tandan Buah Segar (TBS), rendemen minyak kelapa sawit, dan kadar free fatic acid (FFA) dalam crude palm oil (CPO). Data primer yang dikoleksi adalah data analisis jaringan tanaman (khususnya organ daun) dan data analisis kadar minyak sawit dalam buah. Percobaan disusun dalam rancangan tersarang (nested design), dengan masing-masing kebun bertindak sebagai sarangnya. Setiap kebun selanjutnya dibagi menjadi 3 blok, dan data sekunder maupun primer dikoleksi dari sampel yang diambil di masing-masing blok. Analisis yang digunakan dalam percobaan ini adalah analisis varian pada level 5% dan bila terdapat beda nyata pada variabel dilanjutkan dengan analisis korelasi dan regresi sederhana. Berdasarkan hasil analisis regresi yang dilakukan, komponen unsur iklim yang menjadi faktor pembatas adalah curah hujan yang memiliki persamaan regresi  y = -0.007x + 3.168 di Kebun Aek Kuo, kelembapan udara (RH) yang memiliki persamaan regresi  y = 0.039x + 16.43 di Kebun  Rantau Baru, dan suhu udara yang memiliki persamaan regresi  y = 0.250x - 5.129 di Kebun Tungkal Ulu.
TANGGAPAN BUAH SAWO (Manilkara zapota (L.) van Royen) TERHADAP KADAR DAN LAMA PERENDAMAN DALAM LARUTAN CaCl2 Huda, Muchammad Ambar; Trisnowati, Sri; Putra, Eka Tarwaca Susila
Vegetalika Vol 4, No 3 (2015)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (518.112 KB) | DOI: 10.22146/veg.10478

Abstract

Setelah dipanen, buah sawo (Manilkara zapota (L.) van Royen) biasanya hanya bertahan selama 2-3 hari. Penelitian ini mencoba mengetahui pengaruh kadar dan lama perendaman buah sawo dalam larutan CaCl2 pada umur simpan dan mutu buah. Penelitian ini dilaksanakan di Temanggung, Jawa  Tengah pada Bulan Januari sampai Maret 2015 dengan menggunakan rancangan faktorial 4 x 3 + 1 yang diatur dalam RAL (Rancangan Acak Lengkap) dengan tiga ulangan. Faktor pertama adalah kadar larutan CaCl2  yang terdiri atas 0%, 2%, 4%, dan 6% dan faktor kedua adalah lama perendaman yang terdiri atas 60, 90, dan 120 menit. Penelitian ini menunjukkan ketika sawo setiap perlakuan matang, didapatkan hasil bahwa perendaman buah sawo dalam larutan 4% CaCl2 selama 60 menit dapat memperpanjang umur simpan buah selama satu setengah hari dibanding buah sawo yang tidak diberi perlakuan tanpa mengubah mutu penampilan buah. Buah sawo yang direndam dalam larutan 6% CaCl2 selama 90 menit mempunyai umur simpan paling pendek dan ketika buah sawo pada perlakuan kontrol matang, mutu penampilan buah perlakuan tersebut paling buruk, sehingga sudah tidak dapat dikonsumsi.
KUANTITAS DAN KUALITAS HASIL PUCUK ENAM KLON TEH SINENSIS (Camellia sinensis (L.) O. Kuntze var Sinensis) DI BAGIAN KEBUN KAYULANDAK, PT. PAGILARAN Wijayanto, Aryo; Indradewa, Didik; Putra, Eka Tarwaca Susila
Vegetalika Vol 4, No 3 (2015)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (406.5 KB) | DOI: 10.22146/veg.10476

Abstract

Penelitian bertujuan untuk (1) membandingkan hasil pucuk beberapa klon teh sinensis dengan teh asamika, (2) mendapatkan klon teh sinensis dengan hasil dan kualitas hasil yang relatif tinggi, dan (3) mempelajari hubungan sifat fisiologis, pertumbuhan dan komponen hasil dengan hasil pucuk. Penelitian disusun dengan Rancangan Acak Lengkap (RAL) faktor tunggal dengan klon bertindak sebagai faktornya. Klon teh yang digunakan terdiri dari enam klon teh sinensis Oero 1, Oero 2, Oero 3, Oero 4, Oero 5, dan Oero 6 serta sebuah klon asamika yang diwakili Gambung 7. Hasil penelitian menunjukkan bahwa potensi hasil klon teh sinensis lebih rendah dibandingkan klon asamika, namun beberapa klon sinensis memiliki kualitas pucuk yang lebih baik dibanding klon asamika. Klon Oero 6 memiliki potensi hasil pucuk tinggi diantara klon-klon sinensis yang diteliti, sedangkan klon Oero 1, Oero 2, dan Oero 3 memiliki kualitas pucuk paling baik. Jumlah pucuk dan bobot per pucuk mempengaruhi potensi hasil pucuk secara langsung, sedangkan jumlah pucuk peko, bobot per pucuk peko, dan panjang trikoma berpengaruh langsung pada kualitas teh.