A new method for estimating the leaf area index of cucumber. Tuber yield growing degree day calculation fractional radiation interception, leaf area index, and extinction coefficient radiation use. Potato ng and loomis, 1984 is one of the few explanatory type potato models that simulates indivi. Harris 1978 0 the daily requirements of potato tubers during the critical bulking stage are 4. Pdf nitrogen fertilization has considerable effects on growth and yield of potato crop. From the observation in the 2 months after planting map, the sweet potato plants obtained leaf area index lai ranging between 1. Comparing methods for estimating leaf area index by multi. Specific leaf weight was shown to be a valuable index for comparing photosynthesis by various parts of a tree canopy over a season or throughout an entire year.
Potato plant infected with leafroll virus 49 figure 25. Global data sets of vegetation leaf area index lai3g and. Model simulations compared favourably with independent lai measurements obtained with a licor plant canopy analyzer over two seasons. Leaf area index lai of potato crop along the days after emergence dae at different fertilization treatments. This can be measured directly using tube solarimeters placed horizontally above and. Leaf area of 50 leaves of sweet potato plant using imagej. Snowden cultivar, plant nutrition, canopy, leaf area, tubers, stems, dry matter, plant population. Nicola yl followed by nicola gl was found to produce higher leaf area index. E on the dutchbelgian border, in the province of noordbrabant the netherlands. It is defined as the onesided green leaf area per unit ground surface area lai leaf area ground area, m 2 m 2 in broadleaf canopies.
Canopy expansion, growth and yield were examined in 19 genotypes of potato solanurn tuberosum l. Inversion of physically based radiative transfer models is the most established technique for estimating lai from remotely sensed data. Pdf free air co2 enrichment of potato solanum tuberosum l. Direct methods of lai estimation involve significant areas of cultivation and individually measuring the total leaf area, which is not an accurate method to assess. Estimating potato leaf area index for specific cultivars. Relationship between light interception, ground cover and. Potato, storage duration, store types, physiological age and leaf area index i. Pdf radiation interception and leaf area index from. Within this experiment lai and ground cover were highly correlated even under different management practices with correlation coefficients ranging from 0.
Leaf area index and ground cover measurements are frequently used to estimate light interception. Leaf area index lai and the fraction of photosynthetically active radiation absorbed by vegetation fpar are two examples of such variables. Pdf effect of three sand types on potato vegetative. Assessment of unified models for estimating potato leaf. Estimating individual leaf area of potato from leaf length niab. Nondestructive estimation of potato yield using relative variables. Pdf leaf area index in potato estimate from canopy cover. Since the lai of wheat is a crucial morphological index for monitoring its current growth context and estimating. In conifers, three definitions for lai have been used. Radiation interception and leaf area index from foliage cover in diploid potato. Phloem necrosis net necrosis in tuber following currentseason infec tion with leafroll virus 50.
Geopotato uses a creative commons attributionnoncommercialshare alike 4. Leaf area index also varied with storage period with tubers stored for 32 weeks. A simple quantitative model to predict leaf area index in. Shanjun luo, yingbin he, qian li, weihua jiao, yaqiu zhu, jinkuan yu, chang zhao, ruiyang xu, shengli zhang, fei xu, jing sun, zhongcai han, and chuang li assessment of unified models for estimating potato leaf area index under water stress conditions across groundbased hyperspectral data, journal of applied remote sensing 141, 014517 28. Leaf area measurement by photography or lightsensitive meters usually involves destructive measurement and is often fairly time consuming.
The leaf area index lai of the potato crop is extracted from the satellite data and used as input to a crop growth model that allows i to estimate the biomass growth after a spray advice and ii forecast potato yields. In field trials with potato several methods determining the proportion of intercepted solar radiation by the crop were compared. The objective of this study was to develop cultivar specific relationships to estimate the daily leaf area index lai for the potato crop solanum tuberosum l. Pdf physiological responses of potato solanum tuberosum. Ala method applying small number of plant samples leaf area of all experimented sweet potatoes with the value of r2 0. Pdf using sentinel2 data for retrieving lai and leaf. It is also considered as an essential factor in the crops ability to capture solar energy. Because leaf surfaces are the primary border of energy and mass exchange, important processes such as canopy interception, evapotranspiration, and gross photosynthesis are directly proportional to lai. Specific leaf area and leaf dry matter content as alternative. Leaf symptoms caused by interveinal mosaic 47 figure 23. Pdf a simple nondestructive technique for healthy and. Mean annual photosynthetic rate in five separate portions of a spruce canopy was directly proportional to observed differences in specific leaf weight r2. Furthermore observed and forecasted weather information is used as input for the crop. Plant height, leaf area index, net assimilation rate, root length, the root canopy ratio and tuber weight were not influenced by indigenous.
Estimating individual leaf area of potato from leaf length. Growth and yield of potato plants grown from microtubers. Values obtained from dry weight and leaf area data fitted with beta function. Crude estimates of the area of potato leaves can be obtained by comparison with standard leaves of known area e. Pdf the influence of leaf area, light interception and. Aug 08, 2020 estimating potato leaf area index for specific cultivars. Modelling development and growth of the potato crop. In this study, we developed a new method using multiperiod relative vegetation indices rvis and relative leaf area index rlai data. Ground cover %c and leaf area index iaf variation, experienced during the potato cycle for commercial tdc and low tdb density treatments.
The growth and duration of crop leaf area determines the amount of solar radiation intercepted by the canopy and therefore influences the extent of photosynthesis, evaporation, transpiration and final dry matter yield. A technique for leaf area measurement utilizing water spray as an inexpensive substitute for electronic equipment was developed and tested with leaves of potato solanumtuberosuml. Noon canopy temperature was measured on 11 sunny days from 5 july to 15 august, using a portable infrared thermometer everest interscience, model 112. Inversion of the prosail model to estimate leaf area index of.
Leaf area index lai was determined on each ring using an optical system lai2000, licor, lincoln, nb. Lai is defined as the onesided green leaf area per unit vegetated ground area in broadleaf canopies and as onehalf the total needle surface area per unit vegetated ground area in coniferous canopies. Leaf area index drives both the within and the belowcanopy. These were followed by marabel and ditta, respectively.
This study aims to evaluate the suitability of the prosail model for lai estimation of three typical row crops maize, potato, and. Impact of water deficit on light interception, radiation use efficiency. Plus, learn how to measure leaf area index and the proscons of various methods. Log e l 1 were l 1 and l 2 are leaf area indices for successive weeks. Estimating potato leaf area index for specific cultivars springerlink. Results leaf area index lai effect of variety on laiin all the varieties, leaf area index. Assessment of unified models for estimating potato leaf area. The estimation of percentage light interception from leaf. Leaf area index lai, defined as the total onesided area of leaves per unit of ground area breda, 2003, is a key parameter in a wide range of biological and physical processes gower et al. In general, there was a higher concentration of chlorophyll under drought treatments.
Estimation of percentage light interception from leaf area index and percentage ground cover in potatoes. An explanation of yield differences in three potato cultivars. The leaf area index lai is defined as the proportion of leaf area per unit of land area. Introduction leaf area index lai has been defined as the area of green leaves per unit area of the ground and is considered a critical crop parameter jonckeereet al. Moreover, the lai observed during the 3 map had the value ranging from 4. In the irrigated treatment, genotypes differed both in the maximum leaf area index l ai achieved and in the duration the. Uptake of macronutrient uptake by a whole potato plant source. Leaf area index lai is a key variable for modeling energy and mass exchange between the land surface and the atmosphere. Lai is a complex variable that relates not only to the size of the canopy, but also to its density, and the angle at which leaves are oriented in relation to one another and to. Potato ng and loomis, 1984 is one of the few explanatory type potato. Radiation interception and leaf area index from foliage cover. Midlatitude forests and shrublands typically have lai values between 3 and 6. Improved estimation of leaf area index and leaf chlorophyll. Nondestructive measurement of the proportion of ground cover with the aid of a grid correlated well with the proportion of intercepted photosynthetically active radiation as measured with a tube solarimeter and with the leaf area index.
Level2a sentinel2 data are available for download from the. The effect of leaf area index on potatoes yield in soils contaminated. Leaf area index lai and chlorophyll content, at leaf and canopy level, are important variables for agricultural applications because of their crucial role in photosynthesis and in plant functioning. Graduate thesis or dissertation leaf area index and. A simple quantitative model to predict leaf area index in sorghum. Potato leaves showing symptoms of potato virus x 48 figure 24. Leaf expansion is one of the most important growth. A simple, costeffective method for leaf area estimation. Estimation, morphology, lam, leaf area, sweet potatoes. Relationship between groundcover and leaf area index in a. Jul 19, 1995 leaf area index lai is widely used to describe the photosynthetic and transpirational surface of plant canopies. Journal of dryland agriculture growth variability of. After measurement of fresh weight, the area of the sample was measured with a deltat devices cambridge, uk area measurement system.
Assessing broadband vegetation indices and quickbird data in estimating leaf area index of corn and potato canopies jindong wua, dong wangb, marvin e. Absolute growth rate agr, gday, leaf area index lai, m2 m2, and specific leaf area sla, m2 day. The leaf area measurement used is lam by comparing it with the values of leaf area measurement using rating and average leaf area ala estimation methods. From danbatta location the leaf area index produced were highly significantly p. Accurate estimates of lai were difficult to obtain with small plots of. Radiation interception and leaf area index from foliage.
Relationship between light interception, ground cover and leaf area index in potatoes. Mean annual photosynthetic rate in five separate portions of a spruce canopy was directly proportional to observed differences in specific leaf weight r2 0. Inversion of the prosail model to estimate leaf area index of maize, potato, and sunflower. Leaf area indexvalues of potato solanum tuberosum l. Assessing broadband vegetation indices and quickbird data in. Lai is a dimensionless variable and was first defined as the total onesided. In the irrigated treatment, genotypes differed both in the maximum leaf area index l ai achieved and in the duration the canopy was maintained. Physiological assessment of water stress in potato using. The user may copy, distribute and transmit the work and create derivative works. Leaf area index influences photon capture, photosynthesis, assimilate partitioning, growth, and yield formation rajcan and tollenaar, 1999.
An efficient greenhouse method to screen potato genotypes. Pdf using sentinel2 data for retrieving lai and leaf and. Analysis of plant growth of ten varieties of sweet potato. Modeling expansion of individual leaves in the potato canopy. Shoot pruning on sweet potatoes aims to reduce the high of lai value. Pdf relationships between ground cover, intercepted.
Lai can be simply defined as the amount of leaf surface area per unit ground area, and has broad applications in ecophysiology, water balance modeling, and characterization of vegetationatmosphere interactions. Leaf area index lai is widely used in many facets of potato solanum tuberosum l. Full text views reflects the number of pdf downloads, pdfs. Aug 18, 2020 leaf area index lai is a key structural parameter and indicator of plants status. The first tuber formation in microtuber plants was about 7 days later than in conventional seed tuber plants, while tuber bulking occurred about 14 days later in. Triticum aestivum, genotype x environment interaction, and 9 more leaf area index, specific leaf area, air temperature, winter wheat, solanum tuberosum. Introduction leaves are the main photosynthetic organ in. Plant biology, ecology, potato, triticum aestivum, genotype x environment interaction, and 9 more leaf area index, specific leaf area, air temperature, winter wheat, solanum tuberosum, leaf area, triticum aestivum l. A study was carried out at the national root crops research institute, potato. Potassium requirements of potato tubers during the bulking stage are very high as they are considered to be luxury consumers of potassium. Results leaf area index lai effect of variety on laiin all the varieties, leaf area index lai increased from 6 weeks after planting wap. A leaf area index lai expresses the leaf area per unit ground or trunk surface area of a plant and is commonly used as an indicator of the growth rate of a plant.
However, in potatoes, a leaf area index of 3 is sufficient for the interception of 9095% of the incoming radiation, which can maintain the. In sequential terms of sampling from two potato varieties with different duration of growing season, the effect of leaf area index l, lai, on yield of tubers in soils. Bauera adepartment of forest resources, university of minnesota, 115 green hall, 1530 cleveland avenue north, st. Modeling temperature and radiationdriven leaf area. Leaf area index lai is a dimensionless quantity that characterizes plant canopies. Assessing broadband vegetation indices and quickbird data. Apr 01, 2018 the study area that was used for our uav experiment and data simulations, was a potato field solanum tuberosum l. Yield response of ten varieties of sweet potato ipomoea. A smaller green leaf area will not only reduce crop transpiration, but also reduce crop photosynthetic rate due to less light interception. Leaf area index lai, one half the total green leaf area per unit horizontal ground surface, is an important structural property of vegetation. From 6 wap to 11wap, the leaf area duration was calculated using the formula. Knowing the total area covered by leaves helps scientists monitor how much water, carbon, and energy the trees and plants are exchanging with the air above and the ground below. This investigation tested the accuracy of a commercially available instrument licor lai2000 for measuring lai nondestructively on a potato crop.
Inversion of the prosail model to estimate leaf area index. The use of the area under the diseaseprogress curve audpc to assess quantitative disease resistance in crop cultivars. Sep 12, 2001 relative leaf expansion rate, r l a, the lntransformed leaf area index b, and the leaf area index c as a function of thermal time illustrated for potato. Paul, mn 55108, usa bdepartment of soil, water, and climate, university of minnesota, st. Continuous line for a constant r l, broken line for a linearly decreasing r l, symbols in b and c for potato cultivars varying from early maturity, m 8 to late m 3. The leaf area index lai of plant canopies plays an important role in controlling the interactions between terrestrial environments and atmospheric variables networks of groundbased measurements for the routine acquisition of relevant observations, in particular over subsampled geographical regions. Previous studies have reported correlations between leaf area index and ground cover ranging from 0. Comparison of the retrieving precision of potato leaf area index derived from several vegetation indices and spectral parameters of the continuum removal method shanjun luo a,b, yingbin he, zhuozhuo wang b, dingding duana, jingke zhangc, yuantao zhang, yaqiu zhub, jinkuan yua, shengli zhang d, fei xud, jing sun, zhongcai han and weihua jiaoe. Leaf area index influences photon capture, photosynthesis, assimilate partitioning. Drought reduced both the rate of canopy expansion and the maximum l ai achieved. Half of the total needle surface area per unit ground surface area.
Relationship between leaf area index lai estimated through the destructive sampling of biomass and the percentage of. Leaf area measurement by photography or light sensitive meters. For example, leaf area index lai and ground cover gc are two traits frequently used in monitoring plant growth khurana and mclaren, 1982. Leaf area index lai is an important vegetation leaf structure parameter in forest and agricultural. For example, a leaf area index of one means the area is entirely covered by one layer of leaves. The estimation of leaf area in field crops the journal of. Some desert ecosystems have a leaf area index of less than 1, while the densest tropical forests can have an lai as high as 9. In the mechanical method, the value of ala method is closely similar to that of lam compared to that of rating method, showing ala 0. Tt0 is accumulated of mean temperatures 11 c per day from emergence. Journal of agricultural science, cambridge 100, 241 244. A simulation model for potato growth and development. Study of a nondestructive method for estimating the leaf area. A canopy with an leaf area index of 3 would have a 3. The microtuber plants had a lower initial increase in root and leaf area index than conventional seed tuber plants, but had the same leaf area index after about 40 days from emergence.
A method of estimating the mean leaf area per leaf or per plant of a field crop by means of this regression is described. The relative leaf area rla was calculated by dividing the area of each leaf by the mean leaf area of the plant for each rlh as follows. Comparison of the retrieving precision of potato leaf area. Sep 20, 2017 the results showed that spectral information was correlated. Leaf area index, defined as the total leaf area per unit ground area, is commonly used to quantify vegetative canopy structure welles and norman, 1991.
Yield was determined for each irrigation treatment after manual harvesting of. Pdf radiation interception and leaf area index from foliage. Radiation interception and radiation use efficiency of. Forest and crop leaf area index estimation using remote. The growth and yield of potato solanum tuberosum l. Pdf leaf area indexvalues of potato solanum tuberosum l. Nondestructive estimation of potato leaf area index using a. Due to sampling problems, reliable lai data were only available from 7 july onwards.
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