Iskandar Lubis
Departemen Agronomi dan Hortikultura, Fakultas Pertanian, Institut Pertanian Bogor, Jl Meranti, Kampus IPB, Darmaga Bogor 16680, Telp 0251 8629353

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Pengaruh Konsentrasi Besi dalam Larutan Hara terhadap Gejala Keracunan Besi dan Pertumbuhan Tanaman Padi Noor, Aidi; Lubis, Iskandar; Ghulamahdi, Munif; Chozin, Muhammad Achmad; Anwar, Khairil; Wirnas, Desta
Jurnal Agronomi Indonesia (Indonesian Journal of Agronomy) Vol 40, No 2 (2012): JURNAL AGONOMI INDONESIA
Publisher : Bogor Agricultural University

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Abstract

Iron (Fe) toxicity is a major constraint in rice production that decreases yield due to high level of soluble Fe. The aims of this experiement were to study the effect of particular Fe concentrations in nutrient solution on rice growth, and to determine Fe concentration in nutrient solution that caused light, moderate, and severe Fe toxiciy symptom. The experiment was conducted in a greenhouse, Bogor Agricultural University from May to July 2010. A randomized block design with two factors and three replications were used in this study. The first factor was Fe concentration in the medium solution (2, 50, 100, 200, 400, 600 ppm Fe), and second factor was rice genotypes (IR64, Margasari). The results showed the higher Fe concentration in the solution resulted in higher scores of iron toxicity symptoms, higher Fe levels in the plant, and caused stunted growth of rice plants. Levels of Fe in a solution of ≥ 200 ppm Fe inhibited plant growth. Iron toxicity symptom in Margasari was lower than the IR64 varieties, especially at concentrations of 200 and 400 ppm. According to the regression equation Y = 0.022X+ 1849, Fe concentration in the solution which caused light Fe toxicity symptom (score ≤ 3) was ≤ 52 ppm Fe, moderate (score = 5) was 143 ppm Fe, heavy (score = 7) was 234 ppm Fe, and severe (score ≥ 9) was ≥ 325 ppm Fe. Keywords: iron toxicity symptoms, iron concentration, rice
Peanut Cultivar Differences in Yield Based on Source and Sink Characteristics Lubis, Iskandar; Purnamawati, Heni; Poerwanto, Roedhy; Yudiwanti, ,; Mansyuri, Ahmad Ghozi; Rais, Sri Astuti
Jurnal Agronomi Indonesia (Indonesian Journal of Agronomy) Vol 40, No 3 (2012): JURNAL AGONOMI INDONESIA
Publisher : Bogor Agricultural University

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Abstract

This research was conducted to determine peanut cultivar differences in sink and source sizes as represented by vegetative growth and yields. Two sets of experiments were conducted at Bogor Agricultural University farms, Sawah Baru and Cikarawang (06o33’, S, 106o45’E, 250 m altitude). Planting was conducted on June 12 and June 20, 2007 using 20 local and national cultivars in each location. Both experiments used randomized complete block design with three replications. Data were analyzed using correlation and regression analysis. Size of experimental unit was 1.6 m x 4.0 m, with planting density 125,000 plants ha-1. Urea, SP36 and KCl were applied at planting date in the rate of (kg ha-1) 45 N, 100 P2O5 and 50 K2O. Four stages of plant growth were studied: 25 days after planting (DAP); 6 weeks after planting (WAP); 10 WAP (pod filling) and 14 WAP (harvest). Five plants were sampled at 25 DAP, two plants at 6 WAP, 10 WAP and 14 WAP, and separated into leaves, stems, roots and pods. The average yield of two experimental stations showed that Biawak cultivar had the highest yield due to relatively higher aboveground dry weight (source), pod filling percentage and maximum number of gynophor+pods (potential sink). Jepara cultivar had the lowest yield due to low pod filling percentage and potential sink, although its source was considered to be in the medium category. Above ground dry weight at 6 and 10 WAP had close relation with Crop Growth Rate (CGR) during 25 DAP-6 WAP and 6-10 WAP, and the higher CGR during those periods were more related to leaf area index than to single leaf photosynthetic capacity. Keywords: crop growth rate, pod filling percentage, leaf area index, single leaf photosynthetic capacity
Evaluasi Konsumsi Air Beberapa Genotipe Padi untuk Potensi Efisiensi Penggunaan Air Chozin, Muhammad Ahmad; Sopandie, Didy; Junaedi, Ahmad; Lubis, Iskandar
Jurnal Agronomi Indonesia (Indonesian Journal of Agronomy) Vol 40, No 1 (2012): Jurnal Agronomi Indonesia
Publisher : Bogor Agricultural University

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Abstract

Water use efficient varieties in rice may have good opportunity in term of economic value and scarcity of water.  This study was conducted to determine water consumption among rice genotypes that conventionally cultivated as low land (IR64, IPB97-F-15, Ciherang, Mentik Wangi, and Rokan hybrid), up land (Jatiluhur, Silugonggo), and amphibian type (Way Apo Buru, that could be planted both as lowland and up land). Rice seedlings at 14 days old were transplanted in a plastic container containing 83 kg of air dried soil, 1 plant per whole and 6 plants per container. The experiment was conducted in a vinyl house, using randomized complete block design with three replications. During rice growth, water table was maintained at 2 cm above soil surface, and water was added and recorded weekly. The results showed that varieties reveal production components and yield were different significantly. Water consumptions among varieties were significantly different, ranged from 15.93 L plant-1  for IR64 to 24.13 L plant-1  for Jatiluhur, or equal with 3,639 to 4,827 m3  ha-1. Jatiluhur was the most efficient variety in using water. This finding may guide us to explore benefit of water use efficient variety as sustainable option in water management of rice cultivation. Keywords: paddy rice, water management, water use efficiency
Akumulasi dan Distribusi Bahan Kering pada Beberapa Kultivar Kacang Tanah Purnamawati, Heni; Poerwanto, Roedhy; Lubis, Iskandar; Yudiwanti, ,; Rais, Sri Astuti; Manshuri, Ahmad Ghozi
Jurnal Agronomi Indonesia (Indonesian Journal of Agronomy) Vol 38, No 2 (2010): Jurnal Agronomi Indonesia
Publisher : Bogor Agricultural University

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Abstract

<!-- /* Font Definitions */ @font-face {font-family:Calibri; panose-1:2 15 5 2 2 2 4 3 2 4; mso-font-charset:0; mso-generic-font-family:swiss; mso-font-pitch:variable; mso-font-signature:-1610611985 1073750139 0 0 159 0;} /* Style Definitions */ p.MsoNormal, li.MsoNormal, div.MsoNormal {mso-style-parent:""; margin-top:0cm; margin-right:0cm; margin-bottom:10.0pt; margin-left:0cm; line-height:115%; mso-pagination:widow-orphan; font-size:11.0pt; font-family:Calibri; mso-fareast-font-family:"Times New Roman"; mso-bidi-font-family:"Times New Roman"; mso-ansi-language:IN; mso-no-proof:yes;} @page Section1 {size:612.0pt 792.0pt; margin:72.0pt 90.0pt 72.0pt 90.0pt; mso-header-margin:36.0pt; mso-footer-margin:36.0pt; mso-paper-source:0;} div.Section1 {page:Section1;} --> This research was carried out in April–September 2007. The research objective was to study the dry matter distribution pattern of several peanut cultivars. Twenty cultivars were planted at two different locations, Cikarawang and Sawah Baru Experimental Field but at the same elevation (250 m above sea level). The cultivars were scored according to morphological and physiological characters, total N and total non-structural carbohydrates (TNC), yield and yield components.  There were no statistically differences in pod yield, seed yield and harvest index between the cultivars, but there were differences in dry matter distribution between cultivars. TNC content in stem correlated positively with pod fi  lling. Carbohydrates for pod fi  lling presumed were derived from dry matter accumulation in early pod fi  lling stage. It was concluded that the ideal growing type of peanut are early accumulated dry matter but almost no increase of dry matter accumulation in upper part of plant during seed development. Keywords:  dry matter distribution, pod fi lling, peanut
Response of Corn Varieties under Saturated Soil Culture and Temporary Flooding in Tidal Swamp Maulana, Arlingga Ichwan; Ghulamahdi, Munif; Lubis, Iskandar
Journal of Tropical Crop Science Vol 6 No 01 (2019): Journal of Tropical Crop Science
Publisher : Journal of Tropical Crop Science

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Abstract

Corn is one of the important food crops and feeds in the world. Conversion of agricultural land into non-agricultural land is one of the major causes of the decline in corn production. Saturated soil culture (SSC) is a cultivation technology that gives continuous irrigation and maintains water depth constantly and makes soil layer in saturated condition. This technology can prevent pyrite oxidation in the tidal swamp. This research aimed to study the effect of temporary fl ooding under saturated soil culture on the growth and productivity of corn. The research was conducted at Karya Bhakti village, Rantau Rasau, Tanjung Jabung Timur, Jambi Province, Indonesia. The experiment used a split plot design with three replications. The main plot is fl ooding condition, consisted of 1) saturated soil condition continuously, from planting until harvesting time (as control), and 2) saturated soil condition from 0 to 10 DAP (Days after Planting) + fl ooding from 11 to 13 DAP + saturated soil condition from 14 to 28 DAP + fl ooding from 29-31 DAP + saturated soil condition from 32 DAP until harvesting time. The subplot is corn variety, “Sukmaraga”, “Bisma”, “Pioneer 27”, and “Bima 20”. “Pioneer 27” had the highest productivity of 9.33 t.ha-1. Corn varieties with moderate tolerance to temporary fl ooding were “Sukmaraga” and “Bisma”, whereas “Pioneer 27” and “Bima 20” are sensitive to fl ooding.
Evaluation of Growth and Physiological Responses of Three Rice (Oryza sativa L.) Varieties to Elevated Temperatures Kurniawan, Dede Yudo; Junaedi, Ahmad; Lubis, Iskandar; Sunarti, Titi Candra
Journal of Tropical Crop Science Vol 6 No 01 (2019): Journal of Tropical Crop Science
Publisher : Journal of Tropical Crop Science

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Abstract

Temperature is a primary factor that affects the rate of plant development and has great impacts on plant growth, metabolism, and yield. A study was conducted to analyze the effects of elevated temperature on rice morphological and the physiological growth. The research was arranged in a nested randomized block design consisting of two factors, temperatures and rice varieties. Elevated temperatures were provided through the uses of different materials of plastic roof and walls to have an average and maximum temperature of 27.6 °C and 41.6 °C (T1); 28.1°C and 43.8 °C (T2), and 29.5°C and 47.1 C (T3), respectively. The study used three varieties of rice, “Ciasem”, “Ciherang”, and “IR64”. All rice varieties showed signifi cant increases in tiller number per hill and shoot dry weight, but had a decrease in the stomatal conductance, transpiration rate, and SPAD values at grain fi lling stage with the increasing temperatures. The number of tiller per hill increased when temperature was elevated from 27.6 to 28.1 and 29.5°C by about 29.9 and 21.3%, respectively.
Karakterisasi Morfologi dan Fisiologi untuk Mendapatkan Marka Morfologi dan Fisiologi Padi Sawah Tahan Kekeringan (-30 kPa) dan Produktivitas Tinggi (> 8 ton/ha) Sulistyono, Eko; Suwarno, .; Lubis, Iskandar
Jurnal Ilmu Pertanian Indonesia Vol 17, No 2 (2012): Jurnal Ilmu Pertanian Indonesia
Publisher : Institut Pertanian Bogor

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Abstract

This study aims to obtain strains of drought-resistant rice with productivity more than 8 tons/ha, get critical point of soil moisture for drought-resistant rice and obtain morphological and physiological markers for drought-resistant rice. The First year researh consisted of the first experiment was arranged in a randomized block design consisting of two factors with three replications. The first factor is the frequency of irrigation is irrigation every 4, 8, 12, and 16 days. The second factor is 5 strains of rice paddies. The second experiment was arranged in a Split Plot design. The first factor as the main plot is composed control drought stress (irrigation every 2 days until the high pool of 2.5 cm) and drought stress (irrigated when soil water potential at between -30 kPa to -35.9 kPa). The second factor subplot was 100 rice strains to be selected for resistance to drought stress. The second year research was the main plot is composed of control (irrigation as farmers usually do) and drought stress (irrigated when soil water potential reached -30 kPa) and sub plot were 8 rice strains and 4 comparator varieties. Results of experiment is a critical point soil water potential of -35.9 kPa, Drought tolerant lines and production of ≥ 8 tons / ha by 8 lines of strain B12493C-MR-11-4-4, B11598C-TB-2-1-7-MR-4, TB155J-TB-MR-3, TB155J-TB-MR-3-2, B12476G-MR-20, B 12498C-MR-1-1-6, B12825E-TB-1-24, and B11598C-TB-4-1-1. The number of tiller and proline content were a marker of morphology and physiology of drought-resistant rice. Drought tolerant low land rice (-30 kPa) with high productivity (> 8 tons/ha) at farmer’s land condition were B11598C-TB-2-1-7-MR-4, TB155J-TB-MR-3, and TB155J-TB-MR-3-2. Keywords: law land rice, drought tolerant, morphological marker, physiological marker, proline
PENGARUH FREKUENSI IRIGASI TERHADAP PERTUMBUHAN DAN PRODUKSI LIMA GALUR PADI SAWAH Sulistyono, Eko; Suwarno, -; Lubis, Iskandar; Suhendar, Deni
Agrovigor Vol 5, No 1 (2012): MARET
Publisher : Agrovigor

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Abstract

The research was conducted  in February-July 2010 in the greenhouse University Farm, Cikabayan, Dramaga, Bogor. This study aims to determine the effect of irrigation frequency on growth and production of five strains of  lowland rice, to determine critical point of soil water potential  for  drought tolerant screening.  This study used a randomized block  design  which consists of two factors and   three replications  for each combination of treatments. The results of this study indicate that the frequency of irrigation effect on plant height  at 8 and 12 weeks after planting (WAP), the number of tillering at  8 and 12 WAP, leaf length, ratio length / width of leaves, flowering age, number of productive tillers, panicle length, panicle number, number of grain per panicle, the percentage amount of grain fill, the weight of dry grain harvest, canopy dry weight, dry weight of milled grain, and the percentage decrease in production.  Drought stress decreased production by 32.44%,  41.52% and 48.87%  respectively at irrigation frequency of  8, 12, and 16 days. At optimum conditions of water availability, rice strains that produce the highest production is strain 1, 2, and 5. In drought conditions, all strains tested decreased production. Critical point of  soil water potential were -35.9, -25.8 and 0.3 kPa respectively on the vegetative phase,   reproductive phase, and   ripening phase.
PENGARUH UMUR TANAMAN DAN LAMA BANJIR TERHADAP PERTUMBUHAN DAN PRODUKSI GALUR-GALUR PADI SAWAH Sulistyono, Eko; Suwarno, -; Lubis, Iskandar; Triwidiyati, -
Agrovigor Vol 5, No 2 (2012): SEPTEMBER
Publisher : Agrovigor

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Abstract

Penelitian ini bertujuan untuk menjawab pada umur berapa tanaman akan mengalami kerusakan terbesar jika terjadi banjir, berapa lama banjir yang menyebabkan kerusakan terbesar dan bagaimana perbedaan respon galur-galur padi sawah terhadap banjir. Percobaan faktorial disusun dalam Rancangan Split Split Plot dengan tiga ulangan. Faktor pertama sebagai petak utama adalah Waktu banjir terdiri empat tingkat yaitu  8 minggu setelah tanam, 10 minggu setelah tanam, 12 minggu setelah tanam, dan 14 minggu setelah tanam.  Faktor kedua sebagai anak petak adalah lama banjir terdiri tiga tingkat yaitu banjir selama 3 hari, banjir selama 6 hari, banjir selama 9 hari. Faktor ke tiga adalah 20 galur padi sawah. Perlakuan kontrol adalah 20 galur yang tidak mengalami banjir.  Banjir yang terjadi pada umur tanaman 10 minggu setelah sebar menyebabkan penurunan produksi paling besar. Periode kritis tanaman padi terhadap banjir yaitu pada saat tanaman padi berumur 10 sampai 12 minggu setelah sebar. Banjir selama 3, 6, dan 9 hari menyebabkan penurunan produksi sebesar masing-masing 23.4, 25.8, dan 48.6 %.
Karakterisasi Morfologi dan Fisiologi untuk Mendapatkan Marka Morfologi dan Fisiologi Padi Sawah Tahan Kekeringan (-30 kPa) dan Produktivitas Tinggi (> 8 ton/ha) Sulistyono, Eko; Suwarno, .; Lubis, Iskandar
Jurnal Ilmu Pertanian Indonesia Vol 17, No 2 (2012): Jurnal Ilmu Pertanian Indonesia
Publisher : Institut Pertanian Bogor

Show Abstract | Original Source | Check in Google Scholar | Full PDF (88.273 KB)

Abstract

This study aims to obtain strains of drought-resistant rice with productivity more than 8 tons/ha, get critical point of soil moisture for drought-resistant rice and obtain morphological and physiological markers for drought-resistant rice. The First year researh consisted of the first experiment was arranged in a randomized block design consisting of two factors with three replications. The first factor is the frequency of irrigation is irrigation every 4, 8, 12, and 16 days. The second factor is 5 strains of rice paddies. The second experiment was arranged in a Split Plot design. The first factor as the main plot is composed control drought stress (irrigation every 2 days until the high pool of 2.5 cm) and drought stress (irrigated when soil water potential at between -30 kPa to -35.9 kPa). The second factor subplot was 100 rice strains to be selected for resistance to drought stress. The second year research was the main plot is composed of control (irrigation as farmers usually do) and drought stress (irrigated when soil water potential reached -30 kPa) and sub plot were 8 rice strains and 4 comparator varieties. Results of experiment is a critical point soil water potential of -35.9 kPa, Drought tolerant lines and production of ≥ 8 tons / ha by 8 lines of strain B12493C-MR-11-4-4, B11598C-TB-2-1-7-MR-4, TB155J-TB-MR-3, TB155J-TB-MR-3-2, B12476G-MR-20, B 12498C-MR-1-1-6, B12825E-TB-1-24, and B11598C-TB-4-1-1. The number of tiller and proline content were a marker of morphology and physiology of drought-resistant rice. Drought tolerant low land rice (-30 kPa) with high productivity (> 8 tons/ha) at farmer’s land condition were B11598C-TB-2-1-7-MR-4, TB155J-TB-MR-3, and TB155J-TB-MR-3-2.