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Ceptometer LAI

Automated. Affordable. A lightweight, portable, linear array of PAR sensors designed for real time, non-destructive LAI measurements, the LP-80 has you covered when it comes to reliable results, along with time, labor, and cost savings. Request a quote Contact us Knowledge base LP-80. Download PDF or Print Page Leaf Area Index (LAI) is an important plant parameter for both farmers and plant scientists to monitor and/or model the growth and the well-being of plants. Since direct LAI measurement techniques are relatively laborious and time-consuming, various indirect methods have been developed and widely used since the early 1990s. The LP-80 ceptometer uses a linear array of PAR (photosynthetically. Key Words: ceptometer, gap-intercept, LAI, point-frame, quadrat, shrubs INTRODUCTION Leaf area index (LAI) is defined as the one-sided area of leaves above a unit area of ground (Kirkham 2005), and is related to plant-atmosphere gas exchange and plant growth (Kirkham 2005). The leaf is the location of many of the plant's mos ear PAR ceptometer, used to measure light interception in plant canopies, and to calculate Leaf Area Index (LAI). It consists of an integrated microprocessor-driven data logger and probe. The probe contains 80 independent sensors, spaced 1 cm apart. The photosen-sors measure PAR (Photosynthetically Active Radiation) in the 400 to 700 nm waveband Rice LAI measurement using LP-80 AccuPAR Ceptometer

To directly estimate leaf area index using NDVI values, develop a site-specific or crop-specific correlative relationship. The best way is to take colocated measurements of NDVI and LAI (e.g., using a LP-80 ceptometer). For example, colocated measurements of LAI and NDVI were acquired during a period of rapid canopy growth The AccuPAR LP-80 Ceptometer is a lightweight, portable, linear array of photosynthetically active radiation (PAR) sensors for non-destructive leaf area index (LAI) measurements. It allows you to measure canopy PAR interception and calculate LAI at any location within a plant or forest canopy. PAR data can be used with other climate data to. Comparison of leaf area index values measured with the AccuPAR ceptometer and the smart app PocketLAI for three types of canopy: (a) maize, (b) giant reed, and (c) natural grassland; 1:1 line (continuous) and linear regression line (dotted) for AccuPAR values below 5 m 2 m −2

ACCUPAR LP-80 Leaf Area Index Measurement METER

Adjusting Ceptometer Data to Improve Leaf Area Index

Leaf area index (LAI) is a dimensionless quantity that characterizes plant canopies.It is defined as the one-sided green leaf area per unit ground surface area (LAI = leaf area / ground area, m 2 / m 2) in broadleaf canopies.In conifers, three definitions for LAI have been used: . Half of the total needle surface area per unit ground surface area ; Projected (or one-sided, in accordance the. The LAI-2000 and ceptometer are designed to operate in homogenous canopies, not the sparse and irregular vegetation found at the Jornada Experimental Range. Thus these instruments were primarily useful for relative within-site plant area index monitoring. Calculation of some parameters required destructive sampling, a relatively slow and labor. The ceptometer LAI data mean was 0.85 and the point-intercept LAI data mean was 0.33, indicating that ceptometer LAI measurements were about 2.5 times greater than point-intercept LAI measurements. Regression analysis revealed high variation in regression equations defining the linear relationship between ceptometer and point-intercept measured. Ceptometer to LAI-2000 comparison. Direct comparisons of the ceptometer and the LAI-2000 were made on 14 Sep 2012 and throughout 2013. The ceptometer was used every 2 weeks, and every 4 weeks, simultaneous measurements were made with the LAI-2000. These comparisons included across-row as well as along-row measurements for corn and soybean

The LAI-2000 and Ceptometer are instruments that make measurements of the incoming radiation below a plant canopy. In the case of the LAI-2000, measurements are made in the blue (<490 nm) region, while the Ceptometer records incoming radiation in the PAR (400-700 nm) region. These dat when the operator holds the ceptometer horizontally, the PAR passing downward through the canopy can be mea-sured. The ceptometer stored the 16 PAR samples taken at each sampling site and calculated the LAI average automati-cally. This sitewide LAI average was then recorded along with general operator notes regarding the sampling site character the LAI from the images. Ground truth data is collected by a ceptometer within two hours of the flight of the drone. The two LAI datasets (LAI from the digital image and the LAI values from the LAI meter) are correlated, with R2 equal to 0.73. Keywords Leaf area index ·Drone-based mapping ·Precision agriculture · Citrus ·Image processing R. The aim of this study was to assess the leaf area index (LAI) of tomato and cucumber using an AccuPAR-LP-80-ceptometer to find the influence of irrigation. LAI was also determined by destructive. The Decagon's AccuPAR model LP-80 PAR/LAI Ceptometer, which is one of the field instruments provided, measures light interception in plant canopies and converting that PAR value into Leaf Area Index (LAI). It measures PAR ranges from 0 to 2,500 µmol m- 2 s- 1. AccuPAR has a calibrated external PAR sensor that it uses for making simultaneous.

The LAI value obtained by the allometric equations was used to compare the LAI obtained by the ceptometer and was designated as the reference LAI. For the Pinus stands the allometric equations were adjusted using biomass data of 30 trees collected across the entire Trás-os-Montes region The methods included the use of four instruments (AccuPAR Ceptometer, CI-100 Plant Canopy Analyzer, image processing with the AgVision System, LI-COR LAI-2000 Plant Canopy Analyzer) and the application of a logarithmic regression equation. The image processing method demonstrated the highest probability of accurately estimating LAI (P = 0.99) large number of stand-level estimates of LAI could be collected in a relatively short time. The Sunfleck Ceptometer (model SF-80, Decagon Devices, Incorporated), is a hand-held device designed to measure instantaneous fluxes of photosynthetically active radiation (PAR, 400-700 nm) quickly and eas-ily. The ceptometer has 80 light sensors.

The ceptometer was sensitive to changes in PAR transmittance resulting from foliage growth. Predicted stand LAI ranged from 3.5 in the dormant season to a maximum of 5.3 in late July. Predicted LAI values were within 9% of values determined from destructive sampling For example, ceptometer LAI measurements showed essentially no difference between the LAI measured at peak standing crop in 2009 and the LAI measured post-ephemeral leaf drop in the fall of 2009 , while point-intercept data indicated a dramatic drop in measured LAI over the same time period. These results may be partly due to the high.

There are at least three commercial instruments for the indirect measurements of LAI, and these are AccuPAR LP-80, Ceptometer (Meter Group, Inc., USA), LAI-2200 Plant Canopy Analyzer (Li-COR, Lincoln, Nebraska, USA); SunScan Canopy Analysis System (Delta-T Devices Ltd, UK); Demon (CSIRO, Australia) based on the point quadrat method Leaf area index (LAI) is a useful variable to characterize crop dynamics, productivity and water requirements. The three-fold aim of this work was to estimate the LAI of poplano pepper (Capsicum annuum L.) with a ceptometer, compare the results with the destructive method and analyze the relationship between the LAI and crop yield. The. estimate leaf area index (LAI) of eight open-grown deciduous trees, including six white mulberries (Moms alba) and two black cherries (Prunus serotina var. rufula). The methods included the use of four instruments (AccuPAR Ceptometer, CI-100 Plant Canopy Analyzer, image processing with the AgVision System, LI-COR LAI-2000 Plant Canopy Analyzer Francone et al. [6] tested a newly developed method (PocketLAI) against LP-80 ceptometer data, which implies that ceptometry is regarded to be an accurate LAI measurement method in spite of its. LAI also was measured for 242 plots in the site, using an AccuPAR LP-80 ceptometer. The first step after cleaning the point cloud involved detecting the higher forest canopy in the light detection and ranging (lidar) point clouds, using normal change rate assessment

LAI with Ceptometer - YouTub

ceptometer, used to measure light interception in plant canopies, and to calculate Leaf Area Index (LAI). It consists of an integrated microprocessor-driven datalogger and probe. The probe contains 80 independent photodiodes, spaced 1cm apart. The photodiodes measure PAR (Photosynthetically Active Radiation) in the 400-700nm waveband Evaluation of PocketLAI and other indirect methods (AccuPAR ceptometer, LAI-2000) for rice by adapting the ISO 5725 protocol for the validation of analytical methods 2. Comparison with AccuPAR ceptometer for canopy structures deviating from the assumption behind the light transmittance model implemented in PocketLAI PocketLAI IRRI, 8-11 October.

Quantification of LAI was conducted throughout the growing season with a ceptometer (AccuPAR LP-80, Decagon Devices, USA). The ceptometer was placed perpendicular to the crop row, getting a good representative sample of the entire area below and between rows (distance between rows was 0.4m) Indirect methods allow for a quick estimation of the LAI and there is a strong interest in developing economic and user-friendly tools. The tools compared in the present study included two state-of-the-art, rather expensive, commercial instruments, i.e. the Sunscan ceptometer (Delta-T, UK) and the LAI-2000 (Li-Cor, USA) Projected leaf area index (LAI) and Beer-Lambert Law extinction coefficients (K) were estimated for 28-year-old Picea abies (L.) Karst., Larix decidua Mill., Pinus resinosa Ait., and Pinus strobus L. plantations using vertical profile data obtained with a portable integrating radiometer (sunfleck ceptometer). Predicted LAI values were compared. Ceptometer and LAI 2000 Plant Canopy Analyser, with destructive measurements of leaf area, (2) to compare LAI difference between four grass communities, and (3) to relate remote sensing products with LAI measurements. MATERIALS AND METHODS Study Site The field study was conducted at the West Block o

Comparison of leaf area index estimates by ceptometer and PocketLAI smart app in canopies with different structures. Francone C, G. Cappelli, M. Foi, R. Confalonieri, V. Pagani. Author information. ORCIDs linked to this article. Cappelli GA, 0000-0003-4430-9838; Field Crops. Leaf Area Index (LAI) is an important parameter in the measuring of crop health. Mathematical models are used to find the LAI from the images. Ground truth data is collected by a ceptometer within two hours of the flight of the drone. The two LAI datasets (LAI from the digital image and the LAI values from the LAI meter).

of the LAI and there is a strong interest in developing economic and user-friendly tools. The tools compared in the present study included two state-of-the-art, rather expensive, commercial instruments, i.e. the Sunscan ceptometer (Delta-T, UK) and the LAI-2000 (Li-Cor, USA). Thes The homogeneity of the canopy fraction measured along the ceptometer at each individual reading is a major requirement in order to obtain non‐biased LAI estimates. Therefore, the protocol followed to measure the transmitted photosynthetically active radiation at every sun position proved critical for the accuracy of LAI determination ORNL DAAC: Contains Decagon Ceptometer estimates of LAI and fPAR. Contains LI-COR LAI-2000 estimates of leaf area index and mean tip angle 2.2.1. Leaf Area Index Leaf area index was measured with an AccuPAR LP-80 PAR/LAI Ceptometer (Decagon Devices, Inc., Pullman, WA, USA) following Norman and Jarvis model [38] of radiation transmission and scattering. Three LAI measurements were performed per plot, with 10 below and one above canopy PAR measurements per LAI measurement. PAR samplin These methods include destructive sampling and optical instruments: the tracing radiation and architecture of canopies (TRAC), the LAI-2000 plant canopy analyzer, hemispherical photography, and the Sunfleck Ceptometer. The latter three calculate LAI from measured radiation transmittance (gap fraction) using inversion models that assume a random.

Leaf Area Index (LAI): The Researcher's Complete Guide METE

  1. Leaf area index (LAI) is de ned as the total, one-sided area of The AccuPAR LP-80 ceptometer measures sky gap fraction by comparing the intensity of PAR above to that below the canopy to assess canopy light interception and leaf distribution. LAI i
  2. Comparison of Leaf Area Index Estimates by Ceptometer and PocketLAI Smart App in Canopies with Different Structures A method for leaf area index (LAI) estimates based on gap fraction, derived from the segmentation of images acquired at 57 degrees below the canopy, was recently proposed and implemented in the smartphone app PocketLAI, and.
  3. The LAI-2000 ® and ceptometer overestimated LAI in all plots, whereas hemispherical photographs underestimated the values in all measurements, showing that these methods need calibration to be used. No differences were observed between actual LAI and visual estimates across stand ages of 2-8 years and LAI of 1.5-5.3 m 2 m −2 (P > 0.05)
  4. The purpose of this research was to measure and model vegetation growing seasons of deciduous tree species located at Murray State University Hancock Biological Station. The study began in September of 2015, and consisted of collecting leaf area index (LAI) from 3 defined locations using the Decagon LP80 Ceptometer, and Sentek soil probes to measure soil moisture/temperature
  5. Leaf area index and canopy cover can be estimated from measurements of intercepted PAR. The Ceptometer may also aid the user in understanding the importance of sunflecks in the photosynthesis and growth of forest understory plants and crops by recording their occurrance. Other Ceptometer applications include water stress studies, crop an
  6. The LAI-2000 and Ceptometer are designed to operate in homogenous canopies, not the sparse and irregular vegetation found at Jornada. Thus, these instruments were primarily useful for relative within-site plant area index monitoring. Calculation of some parameters required destructive sampling, a relatively slow and labor-intensive activity.
  7. Abstract: Forest leaf area index (LAI) is an important structural parameter controlling many biological and physiological processes associated with vegetation. A wide array of methods for its estimation has been proposed, including those based on the sunfleck ceptometer, a ground-based easy-to-use device taking non-destructive LAI measures
LAI with Ceptometer - YouTube

In Situ Ceptometer Leaf-Area-Index Measurement • LAI may be computed using a Decagon Accupar CeptoCepto etemeter™ tt at co s sts o a ea a ay o 80hat consists of a linear array of 80 adjacent 1 cm2 photosynthetically active radiation (PAR) sensors along a bar. • d Iitbthih tl Incident sunlight above the canopy, Qa, d th and th Leaf area index (LAI) is defined as the one-sided area of leaves above a unit area of ground. It is a fundamental ecosystem parameter that is a required input of process-based plant growth and biogeochemical models. Direct measurement of LAI is the most accurate method, but is destructive, time-consuming, and labor-intensive. LAI is highly variable in time and space on sagebrush-steppe.

Leaf Area Index (LAI) Meter Edaphic Scientifi

Keywords: digital hemispherical photography, cover photography, litter trap, AccuPAR ceptometer, LAI-2000. Rapid, reliable and meaningful estimates of leaf area index (LAI) are essential to the characterization of forest ecosystems. In this contribution the accuracy of both fisheye and non-fisheye digital photography for the estimation of. 2.6 Leaf area index We measured mean leaf area index (LAI) in each plot using an Accupar LP80 ceptometer. LAI is the one-sided area of leaves per unit ground area and is a measure of canopy density; it is expected to influence thermal environment via the interception of solar radiation (Algar et al., 2018 ; Campbell & Norman, 1998 ) Estimates from the LAI-2000 and Ceptometer were very similar (plant area index 0.3, leaf area index 0.22, total fractional cover 0.19, green fractional cover 0.14), while the ADC produced values 5% to 10% higher

Comparison of leaf area index estimates by ceptometer and

Comparison of leaf area index estimates by ceptometer and PocketLAI smart app in canopies with different structures. Francone, C., Pagani, V., Foi, M., Cappelli, G., Confalonieri, R. 2013 - Computers and Electronics in Agriculture, 96, 67-74 Development of an app for estimating leaf area index using a smartphone 1.1 Applications and measurement of leaf area index Leaf area index (LAI) quantifies the amount of leaf surface area per unit ground area. In forest ecosystems, the unit-less quantity LAI provides a measure of the leaf tissue available for photosynthesis. As such, LAI is a fundamental determinant of a range of ecosyste AccuPAR is a linear PAR/LAI ceptometer. In other words, it is a light interception sensor that measures PAR and LAI. It consists of a linear probe and a microcontroller datalogger. The probe contains 80 sensors that intercept light and transmit their data to the microcontroller The observed LAI of this database ranged from 6.4 to 0.34, once again showing the heterogeneity of the Portuguese Pinus forest. Also in general the research has demonstrated a significant difference in the accuracy of LAI as estimated by ceptometer in relation to reference values, thus measurements for Pinus should be corrected

LAI-2200C Plant Canopy Analyzer - LI-COR Bioscience

cover (predominantly Leaf Area Index) on the ground. LAI was estimated with a hemispheric camera system and/or a ceptometer in each of eight 40 m x 40 m plots and at each of 97 randomly selected points within the flightline. The hemispheric camera system was shown to be more effective than the ceptometer for measuring LAI in th Leaf area index (ceptometer) Leaf spot intensity (Florida 1-10 scale) Pod yield at harvest Data analysis: ANOVA and Tukey'stest at p≤0.05 •Peanut is susceptible to soilborne and foliar diseases which can negatively affect plant growth and final yield. • To reduce the severity of different peanut diseases, many fungicide chemistries with

Field Leaf Area Index (LAI) Measurements for Estimating

  1. The non‐intrusive in situ LAI measurements were found to be significantly correlated with in situ above‐ground biomass measurements, suggesting that future field sampling of biomass and LAI can be obtained using a ceptometer
  2. Leaf area index of boreal forests- Theory, techniques, and measurements Jing M. Chen, • Paul M. Rich, • Stith T. Gower, 3 John M. Norman, 4 and Steven Plummer s Abstract. Leaf area index (LAI) is a key structural characteristic of forest ecosystems because of the role of green leaves in controlling many biological and physical processes i
  3. P. S. P. Soilsearch Equipment Private Limited - Offering Ceptometer From Decagon Devices, Soil Testing Device, Soil Testing Machine, मिट्टी परिक्षण के उपकरण, New Items in Maharaja Tagore Road, Kolkata, West Bengal. Read about company. Get contact details and address| ID: 1345289038
  4. Ceptometer LAI=3.2 (wet season) 0,0 1,0 2,0 3,0 4,0 5,0 65 37 49 53 49 29 25 21 17 73 93 97 53 49 53 57 05 65 93 21 81 09 37 97 25 53 13 41 01 29 57 17) Day of year MODIS LAI 2000-2017 AENP Bot Res AENP Sundays Thicket - Botanical Reserv

Example of how a diurnal sequence of ceptometer measurements can be used to correct for the time-dependent bias of row orientation in instantaneous ceptometry: (a) median correction factor (median ratio of diurnal average of inferred plant area index (PAI) to instantaneous value of inferred PAI across 239 genotypes) vs. time of day of. AccuPAR model LP-80 Ceptometer from Meter Group Measure Canopy PAR and Calculate LAI The AccuPAR model LP-80 is a lightweight, portable, linear photosynthetically active radiation (PAR) sensor. It lets you measure canopy PAR interception and calculate leaf area index (LAI) at any location within a plant or forest canopy. PAR data can be used wit Leaf area index (LAI, projected leaf area per unit ground area) is an important structural property of forests. Because leaf surfaces are the primary sites of The ceptometer has 80 light sensors placed at 1-cm intervals along a linear 80-cm wand, attached to a bat-December 1988 RAPID ESTIMATION OF LEAF AREA INDEX 176

Leaf area index was estimated with a non-destructive canopy imager and light interception was measured with a 1-m long ceptometer throughout the summer (June - August) each year. There were no differences in LAI in 2016, while Spindle-Nic29 combinations (regardless of pruning technique) demonstrated the lowest and most optimal LAI values in. LAI as estimated using the Beer-Lambert model from measurements of interception using a hand-held ceptometer. Source The data are documented in Duursma et al. (2003) and Robinson et al (2005). Details Nothing in particular. PREF, and northern Idaho, are very attractive A ceptometer measures LAI by comparing photosynthetically active radiation (PAR) above and below tree canopies. We used a FLIR (Forward Looking Infrared) camera to measure the thermal characteristics of both (1) the tree canopy and (2) the area of cooling beneath the tree in each of the four cardinal directions (resulting in eight thermal. LAI can be measured on the ground by harvesting leaf tissue and quantifying the leaf surface area or by various indirect techniques, such as hemispherical photography or the use of optical instruments (Plant Canopy Analyzer, DEMON, ceptometer, etc)

ACCUPAR Ceptometer model LP-80 ICT Internationa

  1. ed by destructive sampling for comparison. The research was conducted at the Liaoning Water Conservancy Institute, North China in 2016
  2. g radiation by means of a fish-eye lens.
  3. The NEW Plant Canopy Imager CI-110 captures wide-angle canopy images while estimating Leaf Area Index (LAI) and measuring Photosynthetically Active Radiation (PAR) levels. Images live-update on the built-in capacitive monitor, providing instant data for verification and analysis with integrated software in the field under any daylight conditions
  4. Leaf area index (LAI), m 2 of leaf per m 2 of ground, has been identified as one of the most important biophysical variables for landscape to regional-scale research (Pierce and ceptometer calculated an arithmetic mean for each point based on the 16 PAR samples. The calculated LAI value fo
  5. ated by conifer forests, inter
  6. ish, suggesting in high LAI systems a universal deployment method is not as critical as it is in low LAI systems. Citing Literature. Volume 102, Issue 4. July 2010.
  7. We compared simultaneously obtained measurements of LAI from a linear ceptometer and digital hemispheric photography in 21 forest stands on Prince of Wales Island, Alaska. We assessed the relationship between these estimates and allometric LAI based on tree diameter at breast height (LAIDBH). LAI values measured at 79 stations in thinned, un.
ACCUPAR Ceptometer model LP-80 | ICT InternationalAccuPAR LP-80 Ceptometer AccuPAR LP-80 Ceptometer [E-240

AccuPAR PAR/LAI Ceptometer - tms-lab

Aim To evaluate the PocketLAI® smart app for estimating leaf area index (LAI) in woody canopies. Location Northern Italy. Methods PocketLAI - a smartphone application for LAI estimates based on gap fraction derived from the real‐time processing of images acquired at 57° below the canopy - was tested on continuous forest stands, plantations, spotted shrub‐lands and spotted tree‐lands There was good agreement between LAI observed in the field using a line ceptometer and the LAI inferred by the MODIS sensor on the Terra satellite platform, 2 months later in the same season. Responsible NASA Official : Sadashiva Devadig fd_ceptometer() returns a single data set that includes estimates of the fraction of photosynthetically available radiation (faPAR) absorbed by the canopy as well as leaf area index (LAI_cept)-each derived from a handheld ceptometer (LP-80; Decagon Devices) (Table S11 in Atkins et al. 2020) Comparison of leaf area index estimates by ceptometer and PocketLAI smart app in canopies with different structures / C. Francone, V. Pagani, M. Foi, G. Cappelli, R. Confalonieri. - In: FIELD CROPS RESEARCH. - ISSN 0378-4290. - 155(2014 Jan), pp. 38-41 2.2. Destructive Estimation of Leaf Area Index (LAI) Leaf area (LA) per plant was assessed for the 40 trees used in this study (10 trees cv. Cripp's Pink, 18 trees cv. Ultra Red Gala 1 (3.8-4.0 m tall) and 12 trees cv. Ultra Red Gala 2 (2.5-3.0 m tall)). After taking digital images and light measurements from tree canopies, plants were completely defoliated

Comparison of matched LAI estimates from the AccuPAR

The usefulness of the SunScan ceptometer in estimating the leaf area index (LAI) of a sugarcane (cv. NCo376) crop canopy was investigated in Zimbabwe. This was determined by making LAI measurements with the instrument at selected points in the field, followed by destructive sampling at the same points. The two sets of data were then compared Leaf area index (LAI) is an important parameter controlling many biological and physiological processes associated with vegetation on the Earth's surface, such as photosynthesis, respiration, transpiration, carbon and nutrient cycle and rainfall interception. LAI can be measured indirectly by sunfleck ceptometers in an easy and non-destructive way but this practical methodology tends to. The correction is automatically performed by the ceptometer and the Leaf Area Index (LAI) was extracted using FV2200 software (Licor Bioscience, v2.1.1). For each plot, two LAI values were averaged before comparing with canopy closure data obtained from RGB images collected the same day. Multi-feature supervised machine learning approac the LAI measurements were a good proxy of green LAI. For the sites located in Israel, LAI measurements were an average of three measurements taken in the same field of view (FOV) as the spec-tral measurements using a ceptometer (AccuPAR LP80, Decagon Devices, Inc., Pullman, WA, USA) programmed differently accord-ing to the manufacturer's.

Canopy density (measured LAI) across the study vineyardPPT - Plant Canopy Analysis PowerPoint Presentation, freeFunctional Ecology and Global Change Lab » Blog Archive

LAI-2200C Plant Canopy Analyzer. The world standard for non-destructive leaf area index measurements in plant canopies. LI-3000C Portable Leaf Area Meter. A proven system for fast, non-destructive leaf area measurements in the field. LI-3100 major global LAI product validation programs are reviewed. This is followed by a discussion of different validation methods that can be used in the field in situ sensors used to LAI and f APAR collect and measurements (e.g., Li-Cor LAI-2200, TRAC, AccuPar Ceptometer, Digital Hemispherical Photography (DHP) and the Plant Canopy Imager CI-110) If a producer could quickly and easily use a ceptometer to estimate AGB at a future date, then they might have an opportunity to contract with a biofuel production facility for a certain amount of AGB. Measurements of mean FI-PAR and mean LAI were calculated from ceptometer readings to determine if future AGB yield could be predicted Specifically, using an AccuPAR LP-80 Ceptometer, 300 indirect in situ LAI measurements were taken at various sites within the black mangrove (Avicennia germinans) dominated forests of the northern section of this system. From this sample, 225 measurements were then used to develop linear regression models based on their relationship with. Several methods have been proposed in the field measurements, such as the PAR ceptometer (AccuPAR), Plant Canopy Analyzer (LAI-2200), and digital hemispherical photography (DHP).However, the.