When trying to calculate the amount of potato seed needed, the row spacing, withinrow spacing, and seed size need to be taken into consideration. The estimation of percentage light interception from leaf area index and percentage ground cover in potatoes volume 100 issue 1 lindsay burstall, p. Ceptometers and canopy analyzers, as referred before, are methods for estimating the lai leaf area index. Making use of the clausiusclapeyrons equation with the masses of co2 equal to 44 g mol1 and of ch2o corresponding to 30 g mol1, and. Leaf area index is a major variable in carried out by measuring manually, or with. Comparison of two methods for estimating leaf area index on. In conifers, three definitions for lai have been used. Therefore, in order to estimate the water requirement of a crop we first need to measure the evapotranspiration rate.
Estimation, morphology, lam, leaf area, sweet potatoes. Leaf removal could also be based on maintaining a desired leaf area index lai. Previous studies have shown that the size of the potato leaf area is closely related to plant light interception rate and dry matter yield men and mengyun, 1995 and that plant growth and material accumulation determine the crop yield. Potato, storage duration, store types, physiological age and leaf area index i. Potato plant leaf area at tuber initiation and thus the plant ability to intercept radiation during tuber. Because most stomata are found in the lower epidermis, you will determine that surface area. Estimating potato leaf area index for specific cultivars. Quality control to estimating leaf area index with remote sensing imagery. For those reasons, there has been increasing interest in the study of factors determining growth and yield of potato crop, aim ing to optimize management of. Pdf yield response to insect defoliation is primarily a function of light interception. 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. Lai is a dimensionless variable and was first defined as the total onesided. Hemispherical photography, also known as fisheye or canopy photography, is a technique to estimate solar radiation and characterize plant canopy geometry using photographs taken looking upward.
The amount of foliage in the plant canopy is one of the basic ecological characteristics commonly quantified by leaf area index lai. Growth and yield response of irish potato solanum tuberosum to climate in jossouth, plateau state, nigeria. Leaf area index is the product of yield g 2 x% leaves. Leaf area index lai has been defined as the area of green leaves per unit area of the ground and is. Growth and yield response of irish potato solanum tuberosum to. Leaf area measurement by photography or light sensitive meters. A new method for estimating the leaf area index of cucumber. Lai directly quantifies canopy structure, and can be used to predict primary productivity and crop growth.
Leaf area index lai was calculated following the standard formula gardner et. Introduction leaves are the main photosynthetic organ in. Graphic presentation of the proposed approach step 2. Further, an objective method is proposed for the apportioning of the crop mixture area into component crops. There are two known androidbased mobile apps to measure leaf area. To arrive at the rate of transpiration, therefore, you must calculate the leaf surface area of each plant. Mean standard error leaf area index lai for fl1879 potato defoliated for low 50% and. The effect of leaf area index on potatoes yield in soils contaminated. The former, the glai, is a metric commonly used in.
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. 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. Nondestructive estimation of maize leaf area and weight. 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. Request pdf comparison of two methods for estimating leaf area index on. It is a key parameter in ecophysiology, especially for scaling up the gas exchange from leaf to canopy level.
Easy, accurate, inexpensive, and nondestructive methods to determine individual leaf area of plants are a useful tool in physiological and agronomic studies. Leaf area index estimates using remotely sensed data and brdf. Current methods for estimating lai from optical remote sensing are classified into three. Leaf area index and ground cover measurements are frequently used to estimate light interception. Setting up a germination test in a seedling raising tray. Harris skip to main content we use cookies to distinguish you from other users and to provide you with a better experience on our websites. This paper introduces a costeffective alternative called here millimeter graph paper method for standard electronic leaf area meter, using a millimeter graph paper. It consistently outperforms other methods such as ceptometry and hemispherical photography in terms of flexibility, advanced features, accuracy, and ease of use. Estimating individual leaf area of potato from leaf length niab. In these trials the intercepted par haa was derived from the integral over time of green leaf area index glai which was used as a measure of had. Leaf area index lai is the ratio of upper leaf surface area to ground area for broadleaf canopies, or projected conifer needle surface area to ground area for coniferous plants for a given unit area. Abstract the study investigates the response of irish potato to some climate variables in jossouth local government area of plateau state, nigeria.
Here we describe the work related to the estimation of leaf area index lai and specific leaf area sla, or its inverse, the leaf mass per area lma. Leaf area index values of potato solanum tuberosum l. Zeeb road, ann arbor, mi 48106 18 bedford row, london wcir 4ej. Measurement of leaf area in vegetable crops like potato, cucumber. Place 100 seeds on top of the sand and push them in 23 cm deep before covering. The reference rate, et0, is the estimate of the amount of water that is used by a wellwatered grass surface that is roughly 8 to 15 centimeters in height. The estimation of percentage light interception from leaf. 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. Leaf area index lai is widely used to describe the photosynthetic and transpirational surface of plant canopies.
In particular, in the domain estimation approach proposed, various crop mixtures are considered as domains. Therefore, accurate measurements of leave area index lai are essential to understand. It is defined as the onesided green leaf area per unit ground surface area lai leaf area ground area, m2 m2 in broadleaf canopies. Leaf area indexvalues of potato solanum tuberosum l. 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. Both of them are free to download, have an affordable price and provide precise plant leaf data. How can i calculate the lai leaf area index from landsat 8. Methodology for estimation of crop area and crop yield under. Within this experiment lai and ground cover were highly correlated even under different management practices with correlation coefficients ranging from 0. Leaf area index lai is a dimensionless quantity that characterizes plant canopies. However, some potatoes are planted at 34 and 38inch row spacing. Leaf area determination techniques after leaf collection, leaf area can be calculated by means of eitherplanimetric or gravimetric techniques daughtry, 1990. Lay the leaves to be measured on a 1cm grid and trace their outlines. How can i calculate the leaf area index of sugarcane.
The percent leaves is measured by separating leaf and nonleaf tissue from a representative subsample of the. New computer program for estimating leaf area of several vegetable crops. Estimating the water requirements of crops smart fertilizer. The planimetric approach is based on the principle of the correlation between the individual leaf area and the number of area units covered by that leaf in a horizontal plane. Had and haa were derived from leaf area index lai corrected by two methods, the percent reflectance pr. Some quantitative relationships between leaf area index and. In four out of five experiments with potato, face caused decreases in peak leaf area index, with the mean.
Leaf area index is defined as the projected area of leaves over a unit of land m2 m. Location of measurements, measurement design and equipment litterfall is collected according to the specific manual sampling and analysis of litterfall icp forests manual, part xiii. 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. Effect of early blight alternaria solani on healthy area duration and healthy area absorption of potatoes solanum tuberosum grown in canterbury new zealand with different nitrogen application and stress from potato cyst nematode globodera rostochiensis. Remote sensing of leaf area index lai and a spatiotemporally parameterized model for mixed grasslands li shen zhaoqin li xulin guo department of geography and planning university of saskatchewan saskatoon, sk s7n5c8, canada abstract leaf area index lai is an important biophysical variable used to reflect the vegetation condition in ecosystems. New zealand journal of crop and horticultural science. Inversion of the prosail model to estimate leaf area index of. There are some modern devices for determining the leaf area of plants. Estimating potato leaf area index for specific cultivars springerlink.
Leaf area estimation, growth analysis, and yield evaluation. Adding a nutrient to raise the soil test level above this critical value will not produce an economic return on the cost of that addition. A simple, costeffective method for leaf area estimation. Green leaf area index estimation in maize and soybean. Once et0 is known, the water requirement of the crop can be calculated. Leaf area index l, see table table1 1 for abbreviations of a canopy is an important variable in models for predicting crop growth and yields, quantifying cropweed competition, or modelling heat, energy and water exchanges in the plantsoilatmosphere continuum. In the standard situation leaves from a vegetative unit are removed one week before the truss above this unit is harvest ripe. Specific leaf area is a ratio indicating how much leaf area a plant builds with a given amount of leaf biomass. Effect of early blight alternaria solani on healthy area. Plus, learn how to measure leaf area index and the proscons of various methods.