scholarly journals Pengaruh metode aplikasi dan dosis stimulan cair terhadap produksi lateks pada tanaman karet Klon PR 300 umur 25 tahun

Kultivasi ◽  
2020 ◽  
Vol 19 (1) ◽  
pp. 1023
Author(s):  
Cucu Suherman ◽  
Intan Ratna Dewi ◽  
Ria Wulansari
Keyword(s):  
Hevea Brasiliensis ◽  
Block Design ◽  
Rubber Tree ◽  
Treatment Combination ◽  
Application Method ◽  
Randomized Block Design ◽  
The Common ◽  
Latex Production

Sari. Penggunaan stimulan pada tanaman karet (Hevea brasiliensis Muell. Arg.) merupakan salah satu upaya yang umum dilakukan untuk meningkatkan produksi lateks. Penggunaan stimulan bertujuan untuk memperpanjang masa aliran lateks sehingga lateks yang dihasilkan dapat lebih banyak. Penelitian ini bertujuan untuk mendapatkan kombinasi perlakuan terbaik dari metode aplikasi dan dosis stimulan cair yang digunakan untuk meningkatkan produksi lateks pada klon PR 300. Penelitian dilaksanakan pada bulan Maret sampai Mei 2015 di PT. PP Bajabang Indonesia yang memiliki ketinggian tempat 200 meter di atas permukaan laut dengan ordo tanah Inceptisol. Metode penelitian yang digunakan adalah Rancangan Acak Kelompok yang terdiri dari 11 kombinasi perlakuan yang diulang sebanyak tiga kali dengan susunan perlakuan sebagai berikut: Tanpa stimulant (A); Metode Groove + dosis 0,5 mL/pohon (B); Metode Groove + dosis 0,6 mL/pohon (C); Metode Groove + dosis 0,7 mL/pohon (D); Metode Groove + dosis 0,8 mL/pohon (E); Metode Groove + dosis 0,9 mL/pohon (F); Metode Bark + dosis 0,5 mL/pohon (G); Metode Bark + dosis 0,6 mL/pohon (H); Metode Bark + dosis 0,7 mL/pohon (I); Metode Bark + dosis 0,8 mL/pohon (J); dan Metode Bark + dosis 0,9 mL/pohon. Hasil penelitian menunjukkan bahwa metode aplikasi groove dan bark yang dikombinasikan dengan beberapa dosis stimulan cair pada tanaman karet umur 25 tahun menghasilkan volume lateks yang relatif sama dengan tanpa stimulan pada klon PR 300.Kata kunci: Klon PR 300 ∙ Stimulan karet ∙ Penyadapan Abstract. The application of stimulant on rubber tree is one of the common efforts to increase latex production. This application is supposed to extend the period of latex flow, so that can produce more latex. The aim of this research was to get the best treatment combination of application method and liquid stimulant dosage that used to increase latex production on clone PR 300. The research was conducted from March to May 2015 at PT. PP Bajabang Indonesia at 200 meters altitude. The research was arranged using Randomized Block Design (RBD), consisted of 11 treatments and 3 replications. The treatments were: Without Stimulant (A); Groove Method + 0.5 mL/tree dose (B); Groove Method + 0.6 mL/tree dose (C); Groove Method + 0.7 mL/tree dose (D); Groove Method + 0.8 mL/tree dose (E); Groove Method + 0.9 mL/tree dose (F); Bark Method + 0.5 mL/tree dose (G); Bark Method + 0.6 mL/tree dose (H); Bark Method + 0.7 mL/tree dose (I); Bark Method +0.8 mL/tree dose (J); and Bark Method + 0.9 mL/tree dose (K). The results of this research showed that groove method and bark method that combined with variant dosage of liquid stimulant in 25 years old rubber plants produced the same latex with no stimulant on clone PR 300.Keywords: Clone PR 300 ∙ Rubber stimulant ∙ Tapping 

scholarly journals Respons produksi tanaman karet klon BPM 24 terhadap jenis dan konsentrasi stimulan etilen organik kulit pisang

Kultivasi ◽  
2020 ◽  
Vol 19 (2) ◽  
Author(s):  
Syamsiyah Syamsiyah ◽  
Cucu Suherman ◽  
Santi Rosniawaty ◽  
Fetrina Oktavia
Keyword(s):  
Experimental Design ◽  
Hevea Brasiliensis ◽  
Block Design ◽  
Rubber Tree ◽  
Research Institution ◽  
Randomized Block Design ◽  
Latex Production ◽  
Tree Production ◽  
Latex Rubber

AbstrakPuncak produksi tanaman karet klon BPM 24 dicapai pada tahun sadap ke-7 sampai 10, tetapi produksi menurun dengan cepat hingga mencapai titik terendah pada tahun sadap ke-15.  Stimulan merupakan teknologi yang digunakan untuk meningkatkan produksi lateks. Penggunaan stimulan sintetik yang berlebih dapat menurunkan produksi sehingga perlu dicoba stimulant organik. Penelitian ini bertujuan untuk mengetahui respons produksi tanaman karet klon BPM 24 terhadap aplikasi stimulan organik kulit pisang. Penelitian dilaksanakan di Kebun Percobaan Balai Penelitian Karet Sembawa, Palembang, Sumatera Selatan dari September sampai November 2019. Metode percobaan menggunakan Rancangan Acak Kelompok  dengan 11 perlakuan stimulan dan  5 ulangan. Pengamatan dilakukan terhadap produksi lama aliran lateks, volume lateks dan kadar karet kering. Hasil penelitian menunjukkan bahwa perlakuan stimulan organik kulit pisang Ambon dengan konsentrasi 200 g/L mampu meningkatkan lama aliran lateks, dan volume lateks, tetapi pemberian stimulan menurunkan kadar karet kering.Kata kunci : Stimulan Organik , kulit pisang, Lateks, karet Klon BPM 24 AbstractThe rubber tree production clone BPM 24 reaches its peak on 7th to 10th years of tapping incision. After that, the production declines rapidly to the lowest point at 15th year. Stimulant application is one of the technology to increase latex production. Excess application of synthetic stimulants can reduce production, so organic stimulants should be tried. The research intended to know the response of production of rubber tree (Hevea brasiliensis Muell. Arg) clone BPM 24 due to application of the organic ethylene stimulant made of  banana peels. The research was conducted from September to November 2019, at Experimental Plantation of Rubber Research Institution, Sembawa, Palembang, South Sumatra. The method of this research was the experimental design that used Randomized Block Design with 11 treatment and three times replication. The observation made on latex flowing duration, latex volume, and dried latex content. The result showed that application of organic ethylene stimulant made of banana peels cv. Ambon on 200 g concentration could increase latex flowing duration and latex volume,  but reduced dried latex content. Keywords: stimulant, banana peels, latex, rubber clone BPM 24. 

scholarly journals PRODUKSI TANAMAN KARET (Hevea brasiliensis) PADA WAKTU PENGUMPULAN LATEKS YANG BERBEDA

2019 ◽  
Vol 3 (1) ◽  
pp. 27-34
Author(s):  
Mochlisin Andriyanto ◽  
Andi Wijaya ◽  
Junaidi . ◽  
Arief Rachmawan
Keyword(s):  
Flow Rate ◽  
Hevea Brasiliensis ◽  
Block Design ◽  
Rubber Particle ◽  
Rubber Tree ◽  
Total Solid ◽  
Solid Content ◽  
Total Solid Content ◽  
Randomized Block Design ◽  
Collection Period

Latex is a colloidal suspended of rubber particle in rubber tree (Hevea brasiliensis). Technically, the capacity of rubber productivity can be determined by latex collectionperiod after being tapped. The objective of research was to obtain the differences of latex collection period. The study was conducted in September-November 2017 at the Sungei Putih Research Center in Experimental Estate with PB 260 (7 years tapped) on BO-2 (S/2 d3.ET2.5% Ga1.0 6/y(m)).The experimental designused a Randomized Block Design (RBD) with four treatments of latex collection periodi.e 20, 40, 60, 80 minutes after being tapped with three replicates respectively. The parameters observed was gram/tree/tapping (g/p/s), kg/ha/years, latex flow rate (ml/minutes) and total solid content (%).The results showed that latex collection period was significantly different to g/p/s, kg/ha/years and latex flow rate. Total solid content (TSC) was not significantlydifferent in all treatments. The latex collection period of 20 minutes after being tapped had higher productivity than 40, 60, 80 minutes.

scholarly journals COMPORTAMENTO DO VIGOR FOLIAR EM SERINGUEIRA EM DIFERENTES FENOLOGIAS DE DOSSEL

Nativa ◽  
2018 ◽  
Vol 6 (5) ◽  
pp. 497
Author(s):  
José Carlos Pezzoni Filho ◽  
Roberto Filgueiras ◽  
Luis Gustavo Frediani Lessa ◽  
Victor Costa Leda ◽  
Célia Regina Lopes Zimback ◽  
...  
Keyword(s):  
Hevea Brasiliensis ◽  
Satellite Images ◽  
Vegetation Index ◽  
Normalized Difference Vegetation Index ◽  
Block Design ◽  
Rubber Tree ◽  
Tukey Test ◽  
Randomized Block Design ◽  
The Mean ◽  
Phenological Phases

O vigor foliar da seringueira demonstra variação durante o ano, refletindo fases fenológicas que influenciam na produção de látex, além de períodos suscetíveis à doenças e pragas. Assim, objetivou-se avaliar o vigor foliar dos clones GT 1 e RRIM 600 em abril e; em agosto, setembro e outubro, no município de Itiquira – MT, com clima classificado como Aw. Foram avaliados os vigores dos clones GT 1 e RRIM 600 em abril e; em agosto, setembro e outubro, meses precedente a desfolha anual e posterior a reenfolha natural, respectivamente. O vigor foliar foi avaliado baseado no Índice de Vegetação por Diferença Normalizada (NDVI) de imagens do satélite Landsat 5, onde suas médias foram avaliadas pelo teste de Tukey a 5% de probabilidade, com Delineamento em Blocos Casualizados e dois tratamentos (clones). Na análise, os dois clones apresentaram NDVI em abril com vigor foliar médio, ocorrendo diferença nas médias de NDVI, com maior no RRIM 600. Entre agosto e outubro o vigor foi alto, sem diferença entre o NDVI médio destes clones. O clone GT 1 com idade superior aos 19 anos demonstrou mudança de fenologia foliar em abril. O clone RRIM 600, posterior aos 17 ou 18 anos, demonstrou início de mudança fenológica das folhas em abril.Palavras-chave: Hevea brasiliensis, índice de vegetação, desfolha natural, fenologia. BEHAVIOR OF THE FOLIAR VIGOR IN SERINGUEIRA IN DIFFERENT PHENOLOGICAL PERIODS ABSTRACT:The leaf vigor of the rubber tree shows variation during the year, reflecting phenological phases that influence the production of latex, in addition to periods susceptible to diseases and pests. Thus, the objective was to evaluate the foliar vigor of clones GT 1 and RRIM 600 in April and; in August, September and October, in the municipality of Itiquira – MT, with climate classified as Aw. The vigores of clones GT 1 and RRIM 600 were evaluated in April and; in August, September and October, months preceding the annual defoliation and subsequent to natural refoliation, respectively. The foliar vigor was evaluated based on the Normalized Difference Vegetation Index (NDVI), Landsat 5 satellite images where its averages were evaluated by Tukey test at 5% probability, with a randomized block design and two treatments (clones). In the analysis the two clones presented NDVI in April with average leaf vigor, occurring difference in NDVI means, with greater in RRIM 600. Between August and October the vigor was high, with no difference between the mean NDVI of these clones. Clone GT 1 older than 19 years showed a change of foliar phenology in April. The RRIM 600 clone, after the age of 17 or 18 years, it showed the beginning of phenological change of leaves in April.Keywords: Hevea brasiliensis, NDVI, natural defoliation, phenology.

scholarly journals STIMULATION OF LATEX PRODUCTION IN SERINGUEIRA (HEVEA BRASILIENSIS L.) WITH ETRHEL DOSES

2018 ◽  
Vol 41 (5) ◽  
Author(s):  
Alessandro Teles da Cruz ◽  
Joseanny Cardoso da Silva Pereira ◽  
Sara Raquel Mendonça
Keyword(s):  
Positive Response ◽  
Block Design ◽  
Rubber Tree ◽  
Productive Performance ◽  
Rubber Production ◽  
Randomized Block Design ◽  
Long Time ◽  
Tapping Panel Dryness ◽  
Latex Production ◽  
Stimulation Of

ABSTRACT The use of the Ethrel® stimulant on rubber cultivation has become essential to ensure greater rubber production. When applied on the cut of the tree, this stimulant releases the ethylene gas that causes an increase of the exudation period of the latex flow. Dilutions and applications should be performed correctly so that they do not cause tapping panel dryness, which would leave the plant unproductive for a long time. Thus, the objective of this study was to evaluate the effects of increasing doses of ethrel on tapping panel dryness and rubber production of rubber tree clones. Three experiments were conducted using a randomized block design with four treatments (ethrel doses) and three replicates. The clones used were RRIM600, PR255 and PB217 submitted to doses of the stimulant Ethrel 0%, 2.5%, 3.3% and 5% with an interval of application of 30 days. The d/7 bleeding system was used. The productive performance was evaluated monthly and the total of plants with tapping panel dryness at the end of the work. All clones presented a linear positive response to increasing doses. The dose of ethrel 5% favors higher rubber yields in the three evaluated clones, but is associated with high percentage of drying. Thus, it was concluded that the production of rubber is affected positively with the increase of ethrel doses, but this increase causes a higher incidence of panel drying. Thus, it is recommended to use the ethrel 2.5% dose so the production is guaranteed without causing the tapping panel dryness.

scholarly journals Perubahan Cadangan Karbon pada Peremajaan Karet Rakyat

2014 ◽  
Vol 1 (3) ◽  
pp. 133
Author(s):  
Handi Supriadi ◽  
Yulius Ferry
Keyword(s):  
Hevea Brasiliensis ◽  
Block Design ◽  
Rubber Tree ◽  
Dry Weight ◽  
Carbon Stocks ◽  
Rubber Plantation ◽  
Fresh Weight ◽  
Fixed Carbon ◽  
Randomized Block Design ◽  
Fixed Carbon Content

<p>Peremajaan tanaman karet (Hevea brasiliensis) memberikan konsekuensi menurunnya cadangan karbon sehingga diperlukan teknik untuk meminimalisasi kehilangan tersebut. Penelitian bertujuan menganalisis perubahan cadangan karbon pada penebangan tanaman karet tua sebanyak 30%, 50%, 70%, dan 100% yang diikuti oleh penanaman karet muda dengan tanaman sela (jagung dan kacang tanah). Penelitian dilaksanakan bulan Januari sampai Desember 2013 pada pertanaman karet rakyat umur 25 tahun di Kecamatan Way Tuba, Kabupaten Way Kanan, Lampung. Rancangan yang digunakan adalah acak kelompok dengan tiga ulangan. Perlakuan yang diuji adalah penebangan tanaman karet tua 30%, 50%, 70%, dan 100% yang masing-masing diikuti dengan penanaman karet muda dan tanaman sela (jagung dan kacang tanah). Variabel yang diamati: (1) bobot segar dan kering (biomassa); (2) kandungan karbon terikat (fixed carbon); dan (3) cadangan karbon pada pertanaman karet, jagung, kacang tanah, dan tanaman karet muda. Hasil penelitian menunjukkan penebangan karet sebanyak 30%–100% dari populasi menurunkan cadangan karbon sebesar 7,4–24,29 ton C/ha. Penanaman karet muda dan tanaman sela (jagung dan kacang tanah) dapat berkontribusi terhadap penambahan karbon sebesar 0,98-3,28 ton C/ha sehingga kehilangan karbon akibat penebangan tanaman karet tua berkurang menjadi 6,29–22,92 ton C/ha.</p><p>Kata kunci: Hevea brasiliensis, peremajaan, cadangan karbon, tanaman sela</p><p>Rejuvenation of rubber tree (Hevea brasiliensis) can lead to a reduction of carbon stocks. Therefore, appropriate methods are needed to minimize such losses. The objective of this study was to analyze the changes on carbon stocks in the rejuvenation of rubber with logging system of 30%, 50%, 70%, and 100% and intercrops between the young rubber plantation (maize and peanuts). The research was conducted from January to December 2013 at smallholder rubber plantation in Way Tuba District, Way Kanan Regency, Lampung when the trees were 25 years old. The design used was a randomized block design with three replications. The tested treatments were logging of old rubber plants at 30%, 50%, 70%, and 100%, which then followed by planting of young rubber plants and intercropped (maize and peanut). The variables measured were: (1) fresh weight and dry weight (biomass); (2) fixed carbon content; and (3) carbon stocks on rubber plantation, maize, peanuts, and young rubber plants. The results showed that rubber logging at about 30%–100% could reduce carbon stocks by 7.4–24.29 ton C/ha. However, planting of young rubber plants as well as intercropped (maize and peanut) may contributed to the carbon enrichment up to 0.98-3.28 ton C/ha. Hence, the loss of carbon due to logging system turn out to be 6.29–22.92 ton C/ha.</p>

scholarly journals Phenotypic stability and genetic gains in six-year girth growth of Hevea clones

1999 ◽  
Vol 34 (7) ◽  
pp. 1223-1232 ◽  
Author(s):  
Paulo de Souza Gonçalves ◽  
Alberto Kazutoshi Fujihara ◽  
Altino Aldo Ortolani ◽  
Ondino Cleante Bataglia ◽  
Nelson Bortoletto ◽  
...  
Keyword(s):  
Experimental Design ◽  
Regression Coefficient ◽  
Block Design ◽  
Rubber Tree ◽  
Phenotypic Stability ◽  
Plateau Region ◽  
Genetic Gains ◽  
Paulo State ◽  
Randomized Block Design ◽  
Clonal Variance

Rubber tree [Hevea brasiliensis (Willd. ex Adr. de Juss.) Müell. Arg.] budgrafts of seven clones were evaluated on five contrasting sites in the plateau region of the São Paulo State, Brazil. The objective of this work was to study the phenotypic stability for girth growth. The experimental design was a randomized block design with three replications and seven treatments. Analysis of variance of girth at six-year plant growth indicated a highly significant clone x site interaction. Only linear sites and clone x site components of clone x year interaction were significant, indicating that the performance of clones over sites for this trait could be predicted. The clones GT 1 and PB 235 showed the greatest stability in relation to girth growth, with foreseen responses to change, introduced in the sites. The clones PB 235 and IAN 873 showed significative difference in relation to regression coefficient, representing clones with specific adaptability on favorable and unfavorable sites respectively. The clone GT 1 became the most promissory one in the study of stability and adaptability even showing low girth growth. Expected genetic gains from planting sites, along with estimates of clonal variance and repeatability of clonal means are generally greatest or close to the greatest when selection is done at the same site.

scholarly journals Genetic parameters and estimated genetic gains in young rubber tree progenies

2013 ◽  
Vol 48 (4) ◽  
pp. 411-416 ◽  
Author(s):  
Cecília Khusala Verardi ◽  
Erivaldo José Scaloppi Junior ◽  
Guilherme Augusto Peres Silva ◽  
Lígia Regina Lima Gouvêa ◽  
Paulo de Souza Gonçalves
Keyword(s):  
Genetic Gain ◽  
Genetic Parameters ◽  
Block Design ◽  
Rubber Tree ◽  
First Year ◽  
Genetic Gains ◽  
Selection Gain ◽  
Randomized Block Design ◽  
Using Data ◽  
Selection Of

The objective of this work was to assess the genetic parameters and to estimate genetic gains in young rubber tree progenies. The experiments were carried out during three years, in a randomized block design, with six replicates and ten plants per plot, in three representative Hevea crop regions of the state of São Paulo, Brazil. Twenty-two progenies were evaluated, from three to five years old, for rubber yield and annual girth growth. Genetic gain was estimated with the multi-effect index (MEI). Selection by progenies means provided greater estimated genetic gain than selection based on individuals, since heritability values of progeny means were greater than the ones of individual heritability, for both evaluated variables, in all the assessment years. The selection of the three best progenies for rubber yield provided a selection gain of 1.28 g per plant. The genetic gains estimated with MEI using data from early assessments (from 3 to 5-year-old) were generally high for annual girth growth and rubber yield. The high genetic gains for annual girth growth in the first year of assessment indicate that progenies can be selected at the beginning of the breeding program. Population effective size was consistent with the three progenies selected, showing that they were not related and that the population genetic variability is ensured. Early selection with the genetic gains estimated by MEI can be made on rubber tree progenies.

scholarly journals Maximization of genetic gain in rubber tree (Hevea) breeding with effective size restriction

2000 ◽  
Vol 23 (2) ◽  
pp. 457-462 ◽  
Author(s):  
Reginaldo Brito da Costa ◽  
Marcos Deon Vilela de Resende ◽  
Antônio José de Araújo ◽  
Paulo de Souza Gonçalves ◽  
Marcelo de Almeida Silva
Keyword(s):  
Population Size ◽  
Effective Population Size ◽  
Genetic Gain ◽  
Block Design ◽  
Rubber Tree ◽  
Effective Population ◽  
Randomized Block Design ◽  
Size Restriction ◽  
Combined Selection ◽  
Effect Index

The heritability coefficients and the genetic gains associated with individual, combined and among and within progeny selection, and with multi-effect index selection in long-term rubber tree [Hevea brasiliensis (Willd. ex Adr. de Juss.) Muell.-Arg.] breeding were determined using effective population size (Ne) restriction. Twenty-two half sib progenies were planted at the Jaú Experimental Station, São Paulo State, Brazil, in a complete randomized block design, with five replications and 10 plants per plot. The following traits were assessed when the plants were three years old: number of laticiferous vessel rings (NR), dry rubber production (RP), bark thickness (BT) and stem girth (SG). Significant variability was found among progeny with good chances of obtaining genetic gain for RP, BT and SG. Effective population size restriction caused a greater reduction in genetic gain for RP with combined selection and with the multi-effect index than for individual or among and within progeny selection. The simultaneous use of accuracy values and genetic gain from the lower limits of the confidence intervals for gain indicated that individual selection is to be preferred in Hevea breeding programs.

scholarly journals Effect of different application forms of efficient microorganisms on the agricultural productive of two bean cultivars

2019 ◽  
Vol 72 (3) ◽  
pp. 8927-8935 ◽  
Author(s):  
Alexander Calero Hurtado ◽  
Yanery Pérez Díaz ◽  
Dilier Olivera Viciedo ◽  
Elieni Quintero Rodríguez ◽  
Kolima Peña Calzada ◽  
...  
Keyword(s):  
Plant Growth ◽  
Block Design ◽  
Growth And Yield ◽  
Control Soil ◽  
Soil Inoculation ◽  
Randomized Block Design ◽  
Two Factors ◽  
Number Of Leaves ◽  
The Common ◽  
Number Of Seeds

The use of Efficient Microorganisms (EM) can be an effective alternative to improve plant growth and yield in the bean cultivation. Therefore, different forms of application of efficient microorganisms were evaluated in the production of two cultivars of the common bean from November of 2013 to March of 2014. Two factors were studied; the first one was comprised of the two cultivars, Velazco Largo (VL) and Cuba Cueto (CC-25-9-N). The second factor consisted of four treatments with EM; without EM (control), soil inoculation (100 mL L-1), foliage applications (100 mL L-1), and the combined soil inoculation (100 mL L-1) plus foliar applications (100 mL L-1). The experiment was carried out in a randomized block design, in factorial outline 2×4, with three repetitions. The agronomic indicators were evaluated as the number of leaves per plant, the height of plants, number of pods per plant, number of seeds per pod, the mass of 100 seeds (g) and the yield (t ha-1). The results showed that the different forms of application of efficient microorganisms stimulated the agronomic indicators evaluated in both crops. The associated applications between the inoculation of the soil and foliage applications of efficient microorganisms provided better results, producing increments in the yield of 1.13 t ha-1 in VL and 2.15 t ha-1 in CC-25-9-N.

scholarly journals PENGGUNAAN SENYAWA OSMOLIT DAN ALKALIN PADA PENYADAPAN TANAMAN KARET (Hevea brasiliensis)

2019 ◽  
Vol 3 (2) ◽  
pp. 110-120
Author(s):  
Mochlisin Andriyanto ◽  
Miftahul Huda Fendiyanto
Keyword(s):  
Experimental Design ◽  
Hevea Brasiliensis ◽  
Block Design ◽  
Randomized Complete Block Design ◽  
The Common ◽  
North Sumatra ◽  
Treatment Application

Stimulants are one of the common ways to increase yield in rubber plants. Recent, the stimulant that is widely used in rubber tapping is ethephon. Ethephon material can prolong the flow of latex so that yield increases. The combination of osmolyte and alkaline compounds is expected to be an alternative stimulant. Therefore, this study aimed to examine the use of osmolytes and alkaline in rubber plants. This research was conducted at the Experimental Design of the Sungei Putih Estate Research, Deli Serdang, North Sumatra in May-September 2016 with PB 260 clones planting year 2010 with a tapping system S/2 D3 Ga1.0 6 / y (m) in panel B0-2. The experimental design used was a Randomized Complete Block Design (RCBD) with 28 combinations of treatments. The observation parameters in this study were yield (g/p/s), girth (cm) before treatment application and yield (g/p/s) and yield (kg/ha/year) after treatment application. The observations showed that the addition of stimulants with osmolyte and alkaline compounds had a significant effect yield on rubber (g/p/s) in the first tapping slices. The 5% osmolyte and 10% alkaline compounds have yield rubber which is comparable to the application of stimulants made from ethephon in the first tapping slices. Application of 5% osmolyte and 10% alkaline compounds can be used as an alternative stimulant in rubber plants.

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