scholarly journals Respons fisiologi dan hasil lateks tanaman karet klon GT 1 di kebun karet rakyat terhadap sistem eksploitasi dan curah hujan

Kultivasi ◽  
2021 ◽  
Vol 20 (2) ◽  
Author(s):  
Yayuk Purwaningrum ◽  
Yenni Asbur ◽  
Dedi Kusbiantoro ◽  
Khairunnisyah Khairunnisyah
Keyword(s):  
Hevea Brasiliensis ◽  
Research Method ◽  
Split Plot ◽  
Main Plot ◽  
The Relationship ◽  
North Sumatra ◽  
Exploitation System ◽  
Thiol Level ◽  
Latex Production ◽  
Latex Yield

AbstrakKlon GT 1 adalah klon Slow Starter (SS) dimana perubahan sukrosa menjadi partikel karet di dalam pembuluh lateks berlangsung lambat dan pada saat gugur daun hasil lateks lebih stabil. Penelitian ini bertujuan untuk mengetahui hubungan curah hujan dan sistem eksploitasi terhadap fisiologi dan hasil lateks klon GT1. Penelitian dilaksanakan di Kabupaten Langkat Kecamatan Besitang Sumatera Utara, ketinggian tempat 500 – 700 m di atas permukaan laut. Analisa fisiologi lateks di PT. Sucofindo Indonesia. Tanaman yang digunakan adalah klon GT 1 umur 25 tahun dengan besar lilit batang antara 60 – 75 cm, diukur dengan ketinggian 130 cm dari permukaan tanah. Metode percobaan menggunakan Rancangan Split Plot. Petak utama adalah panjang alur  sadap, terdiri dari tiga taraf, yaitu panjang alur sadap 1/4 spiral, panjang alur sadap 1/2 spiral, dan panjang alur sadap 1/8 spiral. Anak petak adalah aplikasi stimulan, terdiri dari dua taraf, yaitu stimulan cair dan stimulan gas. Semua perlakuan diulang tiga kali. Hasil penelitian menunjukkan bahwa panjang alur sadap pendek dan aplikasi stimulan cair memiliki kadar sukrosa lateks tinggi . Aplikasi stimulan gas menunjukkan kadar sukrosa lateks yang tinggi pada panjang alur sadap panjang. Kadar tiol belum menunjukkan tingkat stress pada klon GT 1 dapat terlihat dari kadar tiolnya berkisar 0,84 – 1,10 mM. Produksi lateks klon GT 1 lebih dipengaruhi oleh sistem ekploitasi daripada  curah hujan.Kata Kunci: fisiologi lateks, Hevea brasiliensis, klon GT 1, slow starterAbstractGT 1 is a Slow Starter (SS) clone where the change of sucrose into rubber particles in the latex vessels is slow, and at the time of leaves fall, the latex yield is more stable. This study aimed to determine the relationship between agro-climate and exploitation system on the physiology and yield of latex clone GT1. The research was carried out in Langkat, Besitang, North Sumatra, at an altitude of 500 – 700 m above sea level. Physiological traits analysis of latex was conducted at PT. Sucofindo Indonesia. The plant used was a 25 years old GT 1 clone with a trunk circumference of 60 – 75 cm, measured at the height of 130 cm from the ground. The research method used Split Plot. The main plot was length of tapping path, consisted of 1/4, 1/2, and 1/8 spiral tapping groove length. The subplot was stimulant application, consisted of liquid and gas stimulant. The results showed that short tapping groove length and liquid stimulant application had high latex sucrose content, as given by long tapping groove length and gas stimulant application. Thiol level did not show the stress level in the GT 1 clone, it could be seen from the thiol level of 0.84 – 1.10 mM. Latex production of GT 1 clones was more influenced by the exploitation system than by rainfall.Keywords: GT 1 clone, Hevea brasiliensis, latex phyisiology, slow starter

scholarly journals Pemanfaatan Sluri Gas Bio yang Diperkaya Urin Kambing Fermentasi Terhadap Kecepatan Tumbuh, Produksi Daun dan Komposisi Nutrisi Pada Indigofera Zolliengeriana

2018 ◽  
Vol 1 (2) ◽  
pp. 188-193
Author(s):  
Rudini Arif ◽  
N Ginting ◽  
I Sembiring
Keyword(s):  
Animal Feed ◽  
Nutrient Composition ◽  
Growth Speed ◽  
Research Station ◽  
Leaf Production ◽  
Split Plot ◽  
Main Plot ◽  
Indigofera Zollingeriana ◽  
North Sumatra ◽  
Plot Design

Karakteristik pakan ternak adalah tersedia dalam jumlah besar, murah dengan kualitas baik. Leguminosa seperti Indigofera zollingeriana adalah salah satu tanaman yang memenuhi karakteristik tersebut. Penelitian ini bertujuan untuk mengetahui pemanfaatan sluri gas bio yang diperkaya urin kambing fermentasi terhadap kecepatan tumbuh, produksi daun dan komposisi nutrisi pada Indigofera zollingeriana. Penelitian dilaksanakan di Lahan Loka Penelitian Kambing Potong Sei Putih, Kecamatan Galang Lubuk Pakam Sumatera Utara, pada bulan Maret sampai dengan Agustus 2015 menggunakan 24 buah bibit tanaman Indigofera zollingeriana. Rancangan yang dipakai dalam penelitian ini adalah rancangan split plot design (petak terbagi) dengan tiga dosis pemupukan yang berbeda pada petak utama yaitu R0 (75 ml/plot), R1 (150 ml/plot) dan R2 (225 ml/plot) dan dua jenis pupuk varisi sluri gas bio yang berbeda yaitu S1 (sluri) dan S2 (sluri yang diperkaya dengan urin kambing fermentasi) dengan 4 ulangan. Parameter yang diteliti adalah tinggi tanaman, produksi daun dan komposisi nutrisi. Hasil penelitian menunjukkan bahwa dosis pemupukan sluri dan sluri diperkaya urin kambing fermentasi tidak berpengaruh terhadap kecepatan tumbuh, produksi daun dan lemak kasar. Tidak terdapat perbedaan nyata antara jenis pupuk variasi sluri gas bio pada kecepatan tumbuh, namun terdapat pengaruh yang nyata (P<0,05) pada produksi daun dan komposisi nutrisi. Kesimpulan dari penelitian ini adalah penggunaan sluri dengan diperkaya urin kambing meningkatkan produktivitas Indigofera zolleingeriana.. Characteristics of animal feed are its availability in large quantities, low price, and good quality. Legumes such as Indigofera zollingeriana are one of the plants that meet these characteristics. This study aimed to determine the utilization of bio-gas slurry enriched with fermented goat urine on growth speed, leaf production and nutrient composition in Indigofera zollingeriana. The research was conducted at the Sei Putih Goat Cut Research Station, North Sumatra, Galang Lubuk Pakam District, from March to August 2015 using 24 Indigofera zollingeriana seedlings. The design used in this study was a split plot design with three different fertilization doses in the main plot, namely R0 (75 ml/plot), R1 (150 ml/plot) and R2 (225 ml/plot) and two different types of bio-gas slurry fertilizers namely S1 (slurry) and S2 (slurry enriched with fermented goat urine) with 4 replications. The parameters studied were plant height, leaf production and nutrient composition. The results showed that the dose of fertilizing slurry and slurry enriched with fermented goat urine did not affect growth speed, leaf production and crude fat. There were no significant differences between the types of bio gas slurry fertilizers at growth speed, but there was a significant effect (P <0.05) on leaf production and nutrient composition. The conclusion of this study was the use of slurry with enriched goat urine increased the productivity of Indigofera zollingeriana.

scholarly journals PENGARUH UMUR TANAMAN TERHADAP DIMENSI POHON SENGON (Paraserianthes falcataria. L) PADA KETINGGIAN TEMPAT TUMBUH YANG BERBEDA

2020 ◽  
Vol 21 (1) ◽  
pp. 67
Author(s):  
Aning Munir
Keyword(s):  
Environmental Factors ◽  
Growth And Development ◽  
Research Method ◽  
Genetic Factors ◽  
Plant Age ◽  
Paraserianthes Falcataria ◽  
Total Height ◽  
Split Plot ◽  
Two Factors ◽  
Main Plot

Sengon (Paraserianthes falcataria) can grow from beach to 1600 m sal. The influence of P. falcataria growth cannot be studied because the growth and development of a species is determined by genetic factors (G), environmental factors (E), and interactions between environmental and genetic factors (G + E). The objects of studies is the effect of plant age and altitude of the growing place against the dimension of P.falcataria and obtain the age of plant and altitude that produce the best tree dimension. The research method used experiments using Split Plot with two factors. The main plot factor is the height of the P. falcataria growing site. Results of studies were an interaction between the heights of the place with the age of P.falcaria plants against the volume of P. falcataria. The interaction of the total height and diameter based on the altitude of 825 m sal and the age of P. Falcatia 9 years produced the highest volume of P. falcataria with age of 7 years.

scholarly journals Pengaruh Umur Batang Bawah Terhadap Persentase Keberhasilan Okulasi Hijau pada Tiga Klon Karet (Hevea brasiliensis Muell Agr.)

2014 ◽  
Vol 1 (2) ◽  
pp. 95
Author(s):  
Nana Heryana ◽  
Saefudin Saefudin ◽  
Iing Sobari
Keyword(s):  
Success Rate ◽  
Hevea Brasiliensis ◽  
Experimental Station ◽  
Plot Size ◽  
Split Plot ◽  
Long Time ◽  
Main Plot ◽  
Plot Design ◽  
Research Institute

<p>Perbanyakan karet (Hevea brasiliensis Muell. Agr.) dengan okulasi cokelat membutuhkan waktu yang lama dalam pembibitannya, sedangkan perbanyakan dengan okulasi hijau belum banyak dilakukan karena tingkat keberhasilan masih sangat rendah. Salah satu faktor yang diduga berpengaruh terhadap keberhasilan okulasi hijau adalah umur bibit batang bawah. Tujuan penelitian adalah mengetahui pengaruh perbedaan umur batang bawah terhadap persentase keberhasilan okulasi hijau pada tiga klon karet. Penelitian dilaksanakan di Kebun Percobaan (KP.) Pakuwon, Balai Penelitian Tanaman Industri dan Penyegar pada bulan Januari-Desember 2013. Penelitian menggunakan rancangan petak terbagi, tiga ulangan dan ukuran petak 25 pohon. Petak utama adalah jenis klon batang bawah, terdiri dari 3 klon, yaitu K1 = AVROS 2037, K2 = PB 260, dan K3 = GT 1. Anak petak adalah umur batang bawah terdiri dari 4 taraf, yaitu U1 = 4 bulan, U2 = 5 bulan, U3 = 6 bulan, U4 = 7 bulan. Okulasi dilakukan dengan cara membuka kulit batang bawah, kemudian entres dimasukkan ke dalam jendela sayatan hasil pembukaan. Pengikatan sambungan dilakukan dengan menggunakan plastik khusus dengan cara dililitkan dari bawah ke atas. Pengamatan dilakukan terhadap persentase keberhasilan okulasi hijau pada umur tiga minggu setelah okulasi (MSO). Hasil penelitian menunjukkan bahwa keberhasilan okulasi hijau pada tanaman karet dipengaruhi oleh umur batang bawah. Untuk Klon PB 260 dan GT 1, makin tua umur batang bawah sampai maksimum 7 bulan di polybag maka semakin meningkat persentase keberhasilan okulasi, sedangkan pada klon AVROS 2037 belum memperlihatkan perbedaan yang nyata.</p><p>Kata kunci: Hevea brasiliensis, umur batang bawah, klon, keberhasilan okulasi hijau</p><p>Propagation of rubber (Hevea brasiliensis Muell. Agr.) using brown budding need a long time in the nursery, whereas the propagation usinggreen Budding has not yet been done due to the success rate is still very low. One of the factorthat might influence the successfulness of green budding is rootstock age.. The purpose of this study was to determine the effect of different age of rootstock on the percentage of green budding success in three rubber clones. The experiment was conducted at the Pakuwon experimental station (ES), Indonesian Industrial and Beverage Crops Research Institute, from January-December 2013. The research was done using split plot design with three replications, and the plot size is 25 trees. The main plot was the type of clones used for rootstock that comprised of 3 clones: K1 = AVROS 2037, K2 = PB 260, and K3 = GT 1. Meanwhile, the subplots were rootstock age consists of 4 levels, namely: U1 = 4 months, U2 = 5 months, U3 = 6 months, U4 = 7 months. Observations were made on the percentage of green budding success at 3 weeks old after grafting . The results showed that the success of the green budding on the rubber plants is influenced by the age of rootstock. The use of rootstock up to 7 months old in polybag in PB 260 dan GT 1 clones would increase the percentage of grafting success, whereas AVROS 2037 clone did not show any significant different.</p><p> </p>

scholarly journals Kajian Jumlah Populasi dan Varietas Terhadap Produksi dan Keuntungan Usahatani Bawang Merah di Sumatra Utara (Assessment of Population and Varieties Toward Production and Revenue of Shallot Farming in North Sumatra)

2020 ◽  
Vol 29 (2) ◽  
pp. 219
Author(s):  
Sortha Simatupang
Keyword(s):  
General Population ◽  
Research Method ◽  
Population Level ◽  
National Productivity ◽  
Main Plot ◽  
C Value ◽  
Cultivation Techniques ◽  
North Sumatra ◽  
Selection Of ◽  
Plot Design

<p>Produktivitas bawang merah di Sumatra Utara saat ini lebih rendah dibandingkan dengan produktivitas nasional. Terkait hal tersebut, perlu peningkatan produksi melalui perbaikan teknik budidaya bawang merah. Perbaikan teknik budidaya diawali dengan melakukan pemillihan varietas yang adaptif pada tingkat populasi tinggi di antaranya, yaitu Maja, Bima Brebes dan Mentes. Penelitian ini bertujuan mengetahui teknologi peningkatan produksi dan keuntungan usaha tani bawang merah di Sumatra Utara. Lokasi kegiatan dilaksanakan pada lahan petani dengan ketinggian tempat 1.340 m dpl., yang terletak di Desa Pancur Batu, Kecamatan Merek, Kabupaten Karo, Sumatra Utara pada musim kemarau, bulan Mei hingga Juli 2017. Penelitian ini merupakan super impose dari kegiatan pendampingan pengembangan kawasan Hortikultura di Sumatra Utara. Metode penelitian menggunakan rancangan petak terpisah. Petak utama adalah populasi dan anak petak, yaitu varietas. Perlakuan populasi, yaitu: (a) 175.000 (umum dipakai), (b) 233.333, (c) 311.111, dan (d) 466.667 rumpun/ha. Perlakuan varietas, yaitu varietas Maja, Bima Brebes, dan Mentes. Hasil penelitian menunjukkan bahwa perbedaan varietas tidak berpengaruh nyata terhadap produksi bawang merah. Nilai B/C tertinggi diperoleh dari perlakuan populasi 233.333 rumpun/ha, yaitu 2,08, sedangkan B/C populasi umum (175.000 rumpun/ha) adalah 1,46. Untuk mendapatkan keuntungan paling tinggi secara ekonomi dan layak secara teknis pada budidaya bawang merah tujuan umbi konsumsi, direkomendasikan agar menanam dengan populasi 233.333 rumpun per ha dengan pilihan varietas Maja, Bima Brebes atau Mentes.</p><p><strong>Keywords</strong></p><p>Bawang merah; Keuntungan; Populasi; Produksi; Varietas</p><p><strong>Abstract </strong></p><p>The productivity of shallots in North Sumatra is currently lower than the national productivity. Related to this, it is necessary to increase production through improved shallots cultivation techniques. Improvement of cultivation techniques begins with the selection of adaptive varieties of shallots at high population level including Maja, Bima Brebes, and Mentes varieties. This study aims to determine the technology to increase production and profits of shallot farming in North Sumatra. The location of the activity was carried out on farmers’ land with a hight of 1,340 m.asl, located in Pancur Batu Village, Merek Subdistrict, Karo District, North Sumatra on dry season, may until july 2017. This research was a super impose of the activities of supporting the development of the horticultural area in North Sumatra. The research method used a split plot design. The main plot were population treatments and subplots, namely variety. Population treatments were : (a) 175,000 (commonly used), (b) 233,333, (c) 311,111, and (d) 466,667 clumps /ha; variety treatments were Maja, Bima Brebes, and Mentes. The results showed differences in varieties did not significantly affect to shallot production. The highest of B/C value was obtained by the treatment of the population of 233,333 clumps/ha was 2.08 while the B/C of the general population (175,000 clumps/ha) was 1.46. To get the highest profit economically and technically feasible in the consumption of shallot for tuber consumption, it is recommended that planting with a population of 233,333 clumps per ha with a choice among of Maja, Bima Brebes or Mentes varieties.</p>

Kredit Bermasalah sebagai Pemoderasi Pengaruh Tingkat Penyaluran Kredit terhadap Profitabilitas

2020 ◽  
Vol 5 (1) ◽  
pp. 52
Author(s):  
Sukirno Sukirno
Keyword(s):  
Research Method ◽  
Quantitative Research ◽  
Stock Exchange ◽  
Survey Methods ◽  
Analytical Tool ◽  
Significant Positive Effect ◽  
Purposive Sampling ◽  
The Relationship ◽  
Positive Effect

Abstract This study aims to empirically challenge the moderation of Non-Performing Loans to the effect of Credit Distribution Rates on Profitability. The population of 81 bank companies listed on the Indonesia Stock Exchange in the period 2014-2018 and which met the criteria of the research sample (purposive sampling) were 22 companies. The research method uses survey methods with quantitative research approaches, the analytical tool used is moderation regression. This study concludes that the level of credit distribution has a significant positive effect on profitability and the existence of the problem loan variable is proven to be a moderating variable that weakens the relationship between the level of credit distribution and profitability.    

Hubungan Kepribadian dan Lingkungan dengan Kemampuan Bahasa Indonesia

2019 ◽  
Vol 2 ◽  
Author(s):  
Imam Mujtaba ◽  
Yufiarti Yufiarti ◽  
Elindra Yetti
Keyword(s):  
Research Method ◽  
Positive Relationship ◽  
Language Ability ◽  
Descriptive Statistics ◽  
Quantitative Approach ◽  
Assessment Scale ◽  
Correlation Technique ◽  
Correlational Method ◽  
The Relationship ◽  
Bahasa Indonesia

The purpose of this study was to determine the relationship between students’ personality and environment with their Indonesian Language ability. This research was conducted in South Tangerang City involving 392 2nd grade students. This research method used correlational method with quantitative approach by using descriptive statistics. Data was collected using an assessment scale instrument and analyzed by using correlation technique (regression). The results of this study showed that: (1) There was a positive relationship between personality and students’ Indonesian Language ability with a significant level of α = 0.05, obtained tcal 8.77 ˃ ttable 1.97. (2) There wasa positive relationship between the environment and the students’ Indonesian Language ability with a significant level of α = 0.05, which obtained 9.03 ˃ t table 1.97. (3) There was a positive relationship between personality and environment with the students’ Indonesian Language ability; with a significant level of α = 0.05, obtained tcal 7.92 ˃ t table 1.97. The Implications of the study identified that Indonesian Language ability of the students can be influenced by their personality and environment.

PENGARUH KEPEMIMPINAN DAN MOTIVASI TERHADAP KINERJA KARYAWAN PT. ASTRA HONDA MOTOR DI CIKAMPEK

2016 ◽  
Vol 4 (3) ◽  
Author(s):  
Nuridin, SE., MM Nuridin ◽  
Winda Lia Septiani
Keyword(s):  
Research Method ◽  
Employee Performance ◽  
Research Result ◽  
Sampling Technique ◽  
Analysis Approach ◽  
Explanatory Analysis ◽  
Leadership Motivation ◽  
Saturated Sample ◽  
Causality Relationship ◽  
The Relationship

The purpose of this study was to determine how the relationship and influence of leadership and motivation to employees performance at PT. Astra Honda Motor. The research method was used with Explanatory Analysis approach that explains the causality relationship between variables. Sampling technique was using saturated sample, all members of the population were sampled. From this research result was found there is a relationship and influence which is significant between the variables of leadership motivation to employee performance at PT. Astra Honda Motor among variables by using the test F, where F count larger than F table (32.173 > 3.158). Conclusion: There is a significant effect that can be explained by the result obtained from the R-square is 0530, which means that the variables of leadership and motivation are giving contribution of 53.0% to the variable of employees performance at PT. Astra Honda Motor, while the remaining 47.0% was contributed by other variables which not researched. Suggestions which the author convey to company, leadership which was contained in the company would need to be more increased, considers motivation of employees was good enough.

NILAI KERJA DITINJAU DARI ETNIS BATAK TOBA PADA ANGGOTA SATUAN BRIGADE MOBILE KEPOLISIAN DAERAH SUMATERA UTARA

2019 ◽  
Vol 4 (1) ◽  
pp. 8-14
Author(s):  
Debi Angelina Br. Barus
Keyword(s):  
Work Values ◽  
Quantitative Description ◽  
The North ◽  
Work Value ◽  
Toba Batak ◽  
Relationship Of ◽  
The Relationship ◽  
North Sumatra

This study aims to determine the relationship of work values with the Batak Toba ethnic. This research was conducted at the Mobile Brigade Unit of the North Sumatra Regional Police. The subjects in this study were 45 people. This study uses a quantitative description approach. The results of the study are to find that hamoraon, hagabeon and hasangapon (3H) are in line with the principle of the work value of Brimob members. 3H is the peak achievement of individual Toba Batak ethnic work value in the mobile brigade unit of the North Sumatra regional police. Keyword: Work value, Batak Toba Etnic   Penelitian ini bertujuan untuk mengetahui hubungan nilai kerja dengan etnis Batak Toba. Penelitian ini dilakukan di Satuan Brigade Mobile Kepolisian Daerah Sumatera Utara. Subjek dalam penelitian ini adalah 45 orang. Penelitian ini menggunakan pendekatan kuantitatif deskripsi. Hasil penelitian adalah menemukan bahwa hamoraon, hagabeon dan hasangapon (3H) sejalan dengan prinsip nilai kerja pada satuan anggota Brimob. 3H merupakan puncak pencapaian dari nilai kerja individu yang beretnis Batak Toba di satuan brigade mobile kepolisian daerah Sumatera Utara. Kata Kunci: Nilai kerja, Etnis Batak Toba

scholarly journals Interaction of dicamba, fluthiacet-methyl, and glyphosate for control of velvetleaf (Abutilon theopharsti) in dicamba/glyphosate-resistant soybean

2021 ◽  
pp. 1-21
Author(s):  
Jose H. S. de Sanctis ◽  
Amit J. Jhala
Keyword(s):  
United States ◽  
Field Experiments ◽  
The United States ◽  
Application Rate ◽  
Herbicide Application ◽  
Soybean Yield ◽  
Agronomic Crops ◽  
Split Plot ◽  
Main Plot ◽  
Biomass Reduction

Abstract Velvetleaf is an economically important weed in agronomic crops in Nebraska and the United States. Dicamba applied alone usually does not provide complete velvetleaf control, particularly when velvetleaf is greater than 15 cm tall. The objectives of this experiment were to evaluate the interaction of dicamba, fluthiacet-methyl, and glyphosate applied alone or in a mixture in two- or three-way combinations for velvetleaf control in dicamba/glyphosate-resistant (DGR) soybean and to evaluate whether velvetleaf height (≤ 12 cm or ≤ 20 cm) at the time of herbicide application influences herbicide efficacy, velvetleaf density, biomass, and soybean yield. Field experiments were conducted near Clay Center, Nebraska in 2019 and 2020. The experiment was arranged in a split-plot with velvetleaf height (≤ 12 cm or ≤ 20 cm) as the main plot treatment and herbicides as sub-plot treatment. Fluthiacet provided ≥ 94% velvetleaf control 28 d after treatment (DAT) and ≥ 96% biomass reduction regardless of application rate or velvetleaf height. Velvetleaf control was 31% to 74% at 28 DAT when dicamba or glyphosate was applied alone to velvetleaf ≤ 20 cm tall compared with 47% to 100% control applied to ≤ 12 cm tall plants. Dicamba applied alone to ≤ 20 cm tall velvetleaf provided < 75% control and < 87% biomass reduction 28 DAT compared with ≥ 90% control with dicamba at 560 g ae ha−1 + fluthiacet at 7.2 g ai ha−1 or glyphosate at 1,260 g ae ha−1. Dicmaba at 280 g ae ha−1 + glyphosate at 630 g ae ha−1 applied to ≤ 20 cm tall velvetleaf resulted in 86% control 28 DAT compared with the expected 99% control. The interaction of dicamba + fluthiacet + glyphosate was additive for velvetleaf control and biomass reduction regardless of application rate and velvetleaf height.

Estimation of the Area of Rubber Leaves (Hevea brasiliensis Muell. arg.) Using Two Leaflet Parameters

1972 ◽  
Vol 8 (4) ◽  
pp. 311-314 ◽  
Author(s):  
T. M. Lim ◽  
R. Narayanan
Keyword(s):  
Hevea Brasiliensis ◽  
Simple Method ◽  
Different Ages ◽  
The Relationship

SUMMARYA rapid, simple method is described for estimating the area of rubber leaves from two measurements on the middle and one of the side leaflets. The relationship between the area of a leaflet (A) and its length × breadth (LB), described by the expression A = 0.654 LB, does not vary between the three leaflets or between leaves of different ages, and clonal differences are slight.

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