Reassessing the estimation of leaf area in oil palm (Elaeis guineensis Jacq.) by linear regression equation

AbstractThe area of individual leaves in oil palm has been conventionally estimated from a regression equation that is based on the size and number of leaflets. The aim of the present study is to verify the accuracy of this equation, which became standard in oil palm research. Therefore, true leaf area, measured with a video camera, was estimated from the product of number of leaflets per leaf (n) with mean length (l) times mid-width (w) of six of the longest leaflets (nlw). The database was assembled, annually for the first 4 years after planting, from 2961 leaves of dura × pisifera testcrosses descending from six distinct pisifera origins. The regression coefficients of the regression lines of nlw plotted against true area did not show a trend with age of the palms or a difference among pisifera origins. The common regression equation fitted through all data of this study accurately estimated true leaf area of the testcrosses and also the areas of 2- to 3.5-year-old dura palms of three distinct origins as well as 18-year-old tenera palms. These outcomes are at odds with the conventional regression equation that overestimates the true leaf areas by about 24%. A more recently-developed variant underestimates true area of the young tenera and dura palms by 28%, while overestimating true area of old tenera palms by 19%. Possible causes for these deviations from true area are discussed. The paper argues that parameters depending on leaf area of previous physiological studies need to be reassessed.

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The Effect of Palm Age and Planting Density on the Partitioning of Assimilates in Oil Palm (Elaeis guineensis)

Experimental Agriculture ◽

10.1017/s0014479700015696 ◽

1988 ◽

Vol 24 (1) ◽

pp. 53-66 ◽

Cited By ~ 11

Author(s):

C. J. Breure

Keyword(s):

Leaf Area ◽

Oil Palm ◽

Light Transmission ◽

Elaeis Guineensis ◽

Light Response ◽

Planting Density ◽

Maintenance Respiration ◽

Area Index ◽

Growth Respiration ◽

Photosynthetic Assimilation

SUMMARYYield and growth records from an oil palm planting density experiment, comparing 56, 110, 148 and 186 palms ha−1, and a progeny experiment, planted at 115 and 143 palms ha−1, were used to estimate the partitioning of assimilates into those used for structural dry matter (DM) production, and those used for growth and maintenance respiration.Gross photosynthetic assimilation (A) for closed canopies was estimated from absorbed photosynthetically active radiation (PAR), derived from actual sunshine hours, and the assimilation-light response curve, to be 128 t CH2O ha−1 year−1. A for non-closed canopies was calculated by correcting for the degree of light transmission, which in turn was estimated from recorded leaf area index values (L), i.e. the total leaf area per unit ground area.Forty-eight percent of gross assimilation was used for DM production, about half of this being lost in growth respiration. The remaining 52% was lost in maintenance respiration. These losses appeared to level off before crown expansion was completed, and since trunk biomass continued to increase, maintenance respiration per unit biomass (R) decreased with age.An increase in planting density reduced the assimilates available for bunch DM, had little effect on those for vegetative growth, but strongly reduced maintenance respiration and, since biomass was little affected, reduced R. Assimilates for bunch DM ha−1 reached a maximum at L = 5.6.The observed trends in R as a function of palm age and planting density merit further study.

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Pengaruh Pemberian Pupuk Kandang dan Mikoriza terhadap Pertumbuhan Tanaman Kelapa Sawit (Elaeis guineensis Jacq.) di Pembibitan Pre-Nursery

Agrotekma Jurnal Agroteknologi dan Ilmu Pertanian ◽

10.31289/agr.v3i2.1123 ◽

2019 ◽

Vol 3 (2) ◽

pp. 85

Author(s):

Yan Hariadi Lubis ◽

Ellen Lumisar Panggabean ◽

Azhari Azhari

Keyword(s):

Leaf Area ◽

Oil Palm ◽

Elaeis Guineensis ◽

Dry Weight ◽

Stem Diameter ◽

Cow Manure ◽

Total Leaf Area ◽

Total Leaf ◽

Wet Weight ◽

Elaeis Guineensis Jacq

<h1>In the Indonesian economy, the oil palm commodity plays a pretty bright role because it serves as a source of foreign exchange. The need to develop technology in producing superior seeds. In this study discuss about the Influence of Giving Fertilizer and Mikoriza Against the Growth of Palm Oil Plants (Elaeis guineensis jacq.) In Pre-Nursery Nursery. This study aims to determine the effect of manure and mycorrhizal fertilization as well as its interaction on the growth of coconut plants in pre-nursery nurseries. The study was designed by Factorial Randomized Block Design consisting of 2 treatment factors. The first factor of treatment of manure (K) consisting of 4 levels, namely: K0 = 0 kg / polybag, K1 = 0.15 kg / polybag, K2 = 0.30 kg / polybag, and K3 = 0.45 kg/polybag. The second factor of mycorrhizal treatment (M) consisting of 4 levels, namely: M1 = 12.5 g/polybag, M2 = 25.0 g/polybag, M3 = 37.5 g / polybag. The results showed that the treatment of cow manure up to 0.45 kg/polybag can increase the height of seedlings, stem diameter, total leaf area, wet weight of seedlings and dry weight of seedlings, but did not affect the number of oil palm seedlings.Mikoriza treatment up to 37, 5 g / polybags can increase seed height, stem diameter, total leaf area, wet weight of seedlings and dry weight of seedlings, but have no significant effect on the number of oil palm seedlings. The interaction between cow manure and mycorrhiza had no effect on all parameters observed.</h1>

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White Stripe Disorder of Oil Palm (Elaeis guineensis) in Malaysia

Experimental Agriculture ◽

10.1017/s0014479700005135 ◽

1972 ◽

Vol 8 (2) ◽

pp. 161-169 ◽

Cited By ~ 2

Author(s):

J. A. Rajaratnam

Keyword(s):

Leaf Area ◽

Oil Palm ◽

Photosynthetic Activity ◽

Elaeis Guineensis ◽

White Stripe ◽

Spongy Mesophyll ◽

Air Space ◽

Oil Palms ◽

Palisade Cells ◽

Space Volume

SUMMARYOil palms with white stripe have greatly reduced yields. In the chlorotic areas of the leaflets, columnar palisade cells fail to develop and there is a reduction in air-space volume of the spongy mesophyll. Leaf area and photosynthetic activity are also reduced. Recovery of palms showing symptoms was spasmodic. The condition is discussed in relation to boron, to N/K ratio, polyphenols and availability of photosynthate.

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Optimasi Dosis Pupuk Nitrogen dan Fosfor pada Tanaman Kelapa Sawit (Elaeis guineensis Jacq.) Belum Menghasilkan Umur Satu Tahun

Jurnal Agronomi Indonesia (Indonesian Journal of Agronomy) ◽

10.24831/jai.v43i3.11252 ◽

2016 ◽

Vol 43 (3) ◽

pp. 250

Author(s):

Feni Shintarika ◽

Sudradjat , ◽

Supijatno ,

Keyword(s):

Leaf Area ◽

Nitrogen Fertilizer ◽

Oil Palm ◽

Elaeis Guineensis ◽

Block Design ◽

Nitrogen And Phosphorus ◽

Randomized Block Design ◽

Phosphorus Fertilizers ◽

One Year ◽

Leaf N Content

<p>ABSTRACT</p><p>The accuracy of fertilizer dosage for one-year-old oil palm plants is very important. The objective of the research was to determine the optimum rates of Nitrogen and Phosphorus fertilizers for young oil palm. The experiment was conducted at IPB-Cargill Teaching Farm of Oil Palm at Jonggol, from March 2013-March 2014. This study consisted of two separate experiments namely (1) Optimizing Nitrogen and (2) Optimizing Phosphorus. Both experiments used randomized block design with one factor and three replications. The treatments were five rates of nitrogen or phosphorus (0, 135, 270, 405, 540 g N per plant; 0, 135, 270, 405, 540 g P2O5 per plant). The results showed that nitrogen fertilizer rates increased height linearly at 10 month after treatment (MAT) and quadratically at 12 MAT. Stem girth, frond production and leaf area of 9th frond increased quadratically with N rates (9, 10, 12 MAT). Nitrogen fertilizer quadratically increased leaf chlorophyll content (12 MAT), but did not significantly affected leaf-N content. Phosphorus fertilizer increased palm height linearly (9, 10 MAT) and quadratically (12 MAT). Phosphorus linearly increased stem girth (12 MAT) and quadratically (9, 10 MAT). Frond production was quadratically increased with phosphorus rates (9, 10, 12 MAT). Phosphorus linearly increased leaf area of 9th frond (9 MAT) and quadratically (12 MAT). The optimum rates of nitrogen and phosphorus fertilizers for one year old plant was 382 g N and 331 g P2O5 per plant, respectively.</p><p>Keywords: inorganic, nutrient, optimum rates, single fertilizer</p>

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Estimative of Black Pepper leaf area with basis on the leaf blade linear dimension

Ciência Rural ◽

10.1590/s0103-84782007000500039 ◽

2007 ◽

Vol 37 (5) ◽

pp. 1458-1461 ◽

Cited By ~ 1

Author(s):

Fábio Luiz Partelli ◽

Henrique Duarte Vieira ◽

Alexandre Pio Viana

Keyword(s):

Leaf Area ◽

Leaf Blade ◽

Correlation Coefficients ◽

Black Pepper ◽

Regression Equation ◽

Piper Nigrum ◽

Regression Equations ◽

Linear Regression Equation ◽

Linear Leaf ◽

Predicted Values

This research was aimed at establishing regression equations to estimate black pepper (Piper nigrum) leaf area based on linear leaf measures. Different black pepper varieties where growth on the field, four different size leaves were collected per plant with a total of 52 leaves to establish the regression equation and 28 to validate the equation for each variety (Bragantina, Laçará, Guajarina e Cingapura). Leaf midrib length (LML), maximum leaf broad width (MLBW) and leaf area (LA) were measured. Pearson's linear correlation coefficients were determined between observed and predicted measures with the observed LA, besides estimating the linear regression equation for each variety. The equations best-fitted to estimate LA based on circumscript rectangle were: 1) LA = 2.2689 + 0.6900 x LML x MLBW; 2) LA = 1.6402 + 0.6816 x LML x MLBW; 3) LA = 1.4942 + 0.6215 x LML x MLBW and 4) LA = 0.7467 + 0.6735 x LML x MLBW, for Bragantina, Laçará, Guajarina and Cingapura varieties respectively. For all equations predicted values had high correlation coefficient with observed values thus showing that these equations must be variety specific and that they are appropriate for black pepper leaf area estimative.

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GUANO FERTILIZER APPLICATIONS TO IMPROVE GROWTH OF PALM OIL SEEDS (Elaeis guineensis Jacq) IN PRE-NURSERY

Jurnal Ilmiah Pertanian ◽

10.31849/jip.v16i2.3608 ◽

2020 ◽

Vol 16 (2) ◽

pp. 94-99

Author(s):

Seprita Lidar ◽

Muryanto Muryanto

Keyword(s):

Leaf Area ◽

Oil Palm ◽

Elaeis Guineensis ◽

Fertilizer Treatment ◽

Observation Data ◽

Oil Seeds ◽

Randomized Design ◽

Number Of Leaves ◽

Completely Randomized Design ◽

Elaeis Guineensis Jacq

The study aims to determine the effect and get the best dose of guano fertilizer on the growth of oil palm seedlings in Pre Nursery conducted experimentally with a Completely Randomized Design (RAL) with 5 levels of treatment, 4 replications and 3 plants / plots with observational parameters are seed height, girth and number and leaf area. Observation data were analyzed statistically with variance and continued with Duncan test of 5% level. The application of guano fertilizer has a significant effect on plant height and leaf area, while the number of leaves and stem diameter has no significant effect. The 0.5 kg / polybag guano fertilizer treatment gave the best results to the growth of oil palm seedlings (Elaeis guineensis Jacq) in the pre-nursery.

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PENGARUH PEMBERIAN PUPUK HAYATI CAIR ULTRA GEN DAN PUPUK MAJEMUK NPK MAHKOTA (12-12-17-2) TERHADAP PERTUMBUHAN BIBIT KELAPA SAWIT (Elaeis guineensis Jacq.) DI MAIN NURSERY

Jurnal Agrotek Lestari ◽

10.35308/jal.v4i2.1625 ◽

2020 ◽

Vol 4 (2) ◽

Author(s):

Rian Jura Arrazi ◽

Agam Ihsan Hereri ◽

Erida Nurahmi

Keyword(s):

Leaf Area ◽

Oil Palm ◽

Elaeis Guineensis ◽

Block Design ◽

Stem Diameter ◽

Randomized Block Design ◽

Two Factors ◽

Aceh Province ◽

Number Of Leaves ◽

Almost All

This study aims to determine the effect of the concentration of ultra gene liquid biofertilizers and crowns compound NPK and to find out whether there is any interaction between the both of it on the growth of oil palm seedlings.This research was carried out at the main nursery land of Nusantara I Plantation Limited Company (PTPN I) Kebun Baru, Langsa City, Aceh Province from June to September 2017. This study used factorial randomized block design with 16 treatments repeated 3 times. This study consisted of two factors, namely the dose of ultra gene liquid biofertilizer 0.100, 200 and 300 ml and the dose of crowns compound NPK fertilizer 0,5,10 and 15 g. The results showed that the dose of Ultra Gen liquid biofertilizer significantly affected the stem diameter, leaf number and leaf area in almost all MSP and significantly affected the leaf area of 6 MSP. The dose of Ultra Gen liquid biofertilizer treatment has a very significant effect on the growth of oil palm seedlings, which is indicated by the parameters of the increase in stem diameter, number of leaves and leaf area, and only a significant effect on leaf area 6 weeks after observation. The dose of 200 ml of the Ultra Gen factor shows better growth than other doses. There is a real interaction on seedling growth as indicated by the parameters of the number of seedlings. The highest number of seed leaves was shown by the treatment of 100 ml / polybag ultra gen with NPK 5g/polybag (U1N1), and 200 ml / polybag with no NPK fertilization (U2N0), although not significantly different from the U0N0 and U3N3 treatment combinations, but significantly different with the combination of other treatments. Keywords: crowns NPK, oil palm seeds, ultra gene liquid biofertilizers

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RESPON PERTUMBUHAN BIBIT KELAPA SAWIT (Elaeis guineensis Jacq.) TERHADAP APLIKASI PUPUK N-P-K (12-0,6-6)

Jurnal Media Pertanian ◽

10.33087/jagro.v1i1.11 ◽

2016 ◽

Vol 1 (1) ◽

pp. 11

Author(s):

Nasamsir Nasamsir

Keyword(s):

Leaf Area ◽

Plant Height ◽

Oil Palm ◽

Elaeis Guineensis ◽

Dry Weight ◽

Fertilizer Application ◽

Plant Leaf ◽

Randomized Design ◽

K 12 ◽

Different Doses

AbstractThis research aims to know the oil palm seedling growth response in the main nursery toward N-P-K (12-0,6-6) fertilizer with the trademark Vedagro with different doses. The research was carried out in the Paal Merah Lama village, Southern Jambi sub district, started from 16 September until 16 Desember 2015. The research design used was Completely Randomized Design, with fertilizer dose of Vedagro as a treatment which consists of 6 levels, namely: d0 (control), d1 (5 g polybag-1), d2 (10 g polybag-1), d3 (15 g polybag-1), d4 (20 g polybag-1) and d5 (25 g polybag-1), using 4 replicates. The observed variables a plant height, totally plant leaf area, plant dry weight, and shoot-root ratio. The material used is oil palm seedlings aged 3 mounths. Data were analyzed using analysis of varians, then continued by Duncan test (DNMRT) at the 5% level. The results showed that giving real effect against the Vedagro fertilizer to plant height, totally plant leaf area, plant dry weight, and shoot-root ratio. 20 g dose of Vedagro fertilizer, showed the best effect on seeds height and dry weight, while the best effect on shoot-root ratio and totally plant leaf area was in 15 g dose.Keywords; the growth of plants, fertilizer application AbstrakPenelitian ini bertujuan untuk mengetahui respon pertumbuhan bibit kelapa sawit di pembibitan utama terhadap pemberian pupuk N-P-K (12-0,6-6) (merek dagang Vedagro) dengan dosis yang berbeda. Penelitian dilaksanakan di kelurahan Paal Merah Lama kecamatan Jambi Selatan, mulai 16 September sampai 16 Desember 2015. Rancangan yang digunakan adalah Rancangan Acak Lengkap (RAL), yaitu dosis pupuk Vedagro yang terdiri dari 6 level yaitu, d0 (kontrol), d1 (5 g polybag-1), d2 (10 g polybag-1), d3 (15 g polybag-1), d4 (20 g polybag-1) dan d5 (25 g polybag-1), dengan 4 ulangan. Peubah yang diamati adalah tinggi tanaman, luas daun total, berat kering tanaman dan nisbah tajuk akar. Bahan yang digunakan adalah bibit kelapa sawit berumur 3 bulan. Analisis data menggunakan analisis ragam dan dilanjutkan dengan uji Duncan (DNMRT) pada taraf α 5 %. Hasil penelitian menunjukkan bahwa pemberian pupuk Vedagro berpengaruh nyata terhadap tinggi bibit, luas daun total, berat kering tanaman dan nisbah tajuk akar. Pemberian pupuk Vedagro dengan dosis 20 g polybag-1 memperlihatkan pengaruh terbaik terhadap tinggi bibit dan berat kering bibit, sedangkan dosis 15 g polybag-1 menghasilkan pengaruh terbaik pada nisbah tajuk akar dan luas daun total. Kata kunci ; pertumbuhan tanaman, aplikasi pupuk

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