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Didik Indradewa
Department of Agronomy, Faculty of Agriculture, Universitas Gadjah Mada
Agriculture, Biological Sciences & Forestry

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The Relationships Among Physiological Characters and Productivities of Nine PGL Clones in Medium Land Ika Irmayanti; Didik Indradewa; Eka Tarwaca Susila Putra
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.
Pertumbuhan, Produktivitas, dan Rendemen Minyak Kelapa Sawit di Dataran Tinggi Eka Listia; Didik Indradewa; Eka Tarwaca Susila Putra
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.
Analysis of The Growth of Oil Palm (Elaeis guineensis Jacq.) Exposed by Aluminum Toxicity and Silica as an Amelioration Satiti Ratnasari; Eka Tarwaca Susila Putra; Didik Indradewa
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.
Effect of The Substitution of Compound Fertilizer With Single Fertilizer and Mycorrhizal Inoculation on The Growth and Yield of Soybean Among Eucalyptus Apresus Sinaga; Didik Indradewa; Priyono Suryanto
Jurnal Ilmu Pertanian Vol 1, No 2 (2016): August
Publisher : Faculty of Agriculture, Universitas Gadjah Mada jointly with PISPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1192.127 KB) | DOI: 10.22146/ipas.11341

Abstract

The efforts to improve the productivity of soybean can be done through technological innovation by the provision of chemical fertilizers and mycorrhizae. This study were aimed to obtain information on the effect of a single fertilizer, which can provide the same or higher level of soybean crops if compared with those compound fertilizers, as well as to find out the effect of mycorrhizae to the improvement of efficiency in the use of inorganic fertilizers. It is expected that the mycorrhizae inoculation can reduce single fertilizer’s dose to the level equivalent to the compound fertilizer given by farmers. The study was conducted in Bleberan Village, Playen Subdistrict, Gunung Kidul Regency, Yogyakarta from February to May 2015. It was conducted by using a two-factors factorial design arranged in a randomized block design with three replications. The first factor was inorganic fertilizer (N, P2O5 and K2O), consisting of 5 levels, i.e. without fertilizer (0-0-0 kg/ ha), Phonska fertilizer (45-45-45 kg/ha), single fertilizer (45 -45-45 kg/ha), a low single fertilizer (23-36-30 kg/ha) and high single fertilizer (23-108-90 kg/ha). The second factor was mycorrhizal inoculation, consisting of three levels, i.e. without mycorrhizae (0 g), medium dose (2.5 g) and high dose (5 g). Data were analyzed using Analysis of Variance (ANOVA) at a significance level of 5%. If there was a significant difference, analysis was followed by Duncan Multiple Range Test with a significance level of 5%. The relationship between variables observed was examined by a correlation analysis. The results showed that there was no interaction between inorganic fertilizer and mycorrhizal application. The dose of single fertilizer which was equivalent to the dose of compound fertilizer given to soybean could increase crops by 1.37 t/ha compared with plants treated with a compound fertilizer 1.13 t/ha. The results of correlation analysis among parameters showed that there were correlations between the grain crops and height (r = 0.506**), stem diameter (r = 0.303*), and the number of pods per plant (r = 0.313*).
The Relationships Among Physiological Characters and Productivities of Nine PGL Clones in Medium Land Ika Irmayanti; Didik Indradewa; Eka Tarwaca Susila Putra
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 | 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.
Pertumbuhan, Produktivitas, dan Rendemen Minyak Kelapa Sawit di Dataran Tinggi Eka Listia; Didik Indradewa; Eka Tarwaca Susila Putra
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 | 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.
Analysis of The Growth of Oil Palm (Elaeis guineensis Jacq.) Exposed by Aluminum Toxicity and Silica as an Amelioration Satiti Ratnasari; Eka Tarwaca Susila Putra; Didik Indradewa
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 | 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.
Effect of The Substitution of Compound Fertilizer With Single Fertilizer and Mycorrhizal Inoculation on The Growth and Yield of Soybean Among Eucalyptus Apresus Sinaga; Didik Indradewa; Priyono Suryanto
Jurnal Ilmu Pertanian Vol 1, No 2 (2016): August
Publisher : Faculty of Agriculture, Universitas Gadjah Mada jointly with PISPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ipas.11341

Abstract

The efforts to improve the productivity of soybean can be done through technological innovation by the provision of chemical fertilizers and mycorrhizae. This study were aimed to obtain information on the effect of a single fertilizer, which can provide the same or higher level of soybean crops if compared with those compound fertilizers, as well as to find out the effect of mycorrhizae to the improvement of efficiency in the use of inorganic fertilizers. It is expected that the mycorrhizae inoculation can reduce single fertilizer’s dose to the level equivalent to the compound fertilizer given by farmers. The study was conducted in Bleberan Village, Playen Subdistrict, Gunung Kidul Regency, Yogyakarta from February to May 2015. It was conducted by using a two-factors factorial design arranged in a randomized block design with three replications. The first factor was inorganic fertilizer (N, P2O5 and K2O), consisting of 5 levels, i.e. without fertilizer (0-0-0 kg/ ha), Phonska fertilizer (45-45-45 kg/ha), single fertilizer (45 -45-45 kg/ha), a low single fertilizer (23-36-30 kg/ha) and high single fertilizer (23-108-90 kg/ha). The second factor was mycorrhizal inoculation, consisting of three levels, i.e. without mycorrhizae (0 g), medium dose (2.5 g) and high dose (5 g). Data were analyzed using Analysis of Variance (ANOVA) at a significance level of 5%. If there was a significant difference, analysis was followed by Duncan Multiple Range Test with a significance level of 5%. The relationship between variables observed was examined by a correlation analysis. The results showed that there was no interaction between inorganic fertilizer and mycorrhizal application. The dose of single fertilizer which was equivalent to the dose of compound fertilizer given to soybean could increase crops by 1.37 t/ha compared with plants treated with a compound fertilizer 1.13 t/ha. The results of correlation analysis among parameters showed that there were correlations between the grain crops and height (r = 0.506**), stem diameter (r = 0.303*), and the number of pods per plant (r = 0.313*).
Co-Authors Apresus Sinaga Eka Listia Eka Tarwaca Susila Putra Ika Irmayanti Priyono Suryanto Satiti Ratnasari