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Showing 1 to 20 of 286 for “"leaf area"”.
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Estimating daily green leaf area index for corn in Virginia
A model to predict the daily green leaf area index (GLAI) for corn has been developed for Indiana conditions. Using daily maximum and minimum temperatures the GLAI was predicted for the vegetative stage, reproductive and grain filling stage, and the leaf senescing stage of corn. Predictions of GLAI …
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Investigations on the relation between leaf area and size of peaches
Thesis (M.S.)--Michigan State College of Agriculture and Applied Science, 1935
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Improved leaf area index estimation by considering both temporal and spatial variations
Variations in Leaf Area Index (LAI) can greatly alter output values and patterns of various models that deal with energy flux exchange between the land surface and the atmosphere. Customarily, such models are initiated by LAI estimated from satellite-level Vegetation Indices (VIs) including …
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Assessment of Soybean Leaf Area for Redefining Management Strategies for Leaf-Feeding Insects
Commercially available leaf area index (LAI) meters are tools that can be used in making insect management decisions. However, proper technique must be determined for LAI estimation, and accuracy must be validated for the meters. Full-season soybean require LAI values of at least 3.5 to 4.0 by …
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QUANTIFYING THE DISTRIBUTION OF FOREST FUNCTIONAL TYPES AND FOREST LEAF AREA INDEX IN THE ALPS
… and to build an extrapolation for other test areas in the Alps (Stubai and Ötz Valleys). Although a vast GIS data set had been assembled for the National Park, remote sensing was not previously used as a tool for land cover mapping and forest ecosystem analysis. For supervised classification, …
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Changes in Leaf Area and Nutrient Content of Celtis spp. Across a Precipitation Gradient in Texas
… that an increase in precipitation increases leaf size and the C/N ratio, but can decrease leaf nitrogen concentration, thereby increasing the quantity of forage while potentially decreasing quality. I examined whether this prediction held across the longitudinal precipitation gradient of …
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Elevated Atmospheric Carbon Dioxide and Ozone Concentrations Alter Leaf Area Index Through Changes in Leaf Production and Expansion
… for the change differed between the species. Leaf number was increased by elevated [CO2] in aspen, whereas individual leaf size was increased in soybean. Aspen and soybean had similar responses to elevated [O3]. Most previous research has ignored the potential effects of O3 on young leaves and …
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The short-term effects of fertilization on loblolly pine (Pinus taeda L.) photosynthesis, dark respiration, and leaf area
… (Rd), volume, height, basal diameter, and leaf area responses in eight clones to fertilization (112 kg/ha N) over the course of a growing season in the field. Measurements were conducted intensively before and after fertilization in order to track the initial physiological changes prior to …
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Leaf area index, light penetration, and carbohydrate reserves during growth of Kentucky 31 tall fescue (Festuca arundinacea Schreb.)
… interrelationship between dry matter production, leaf area index (LAI), light penetration through the canopy and carbohydrate reserve fluctuations during regrowth under different growth stages and cutting managements of Kentucky 31 tall fescue were studied in three field experiments during spring …
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The discrete wavelet transform as a precursor to leaf area index estimation and species classification using airborne hyperspectral data
… pine species (Pinus spp.), (2) estimation of leaf area index (LAI) using an empirically-based model, and (3) estimation of LAI using a physically-based model. For pine species classification, different sets of Haar wavelet features were compared to each other and to calibrated radiance. The …
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Influence of Several Herbicides on Visual Injury, Leaf Area Index, and Yield of Glyphosate-Tolerant Soybean <I>(Glycine max)</I>
… date, and herbicide treatment on soybean injury, leaf area index (LAI), and yield. Three glyphosate-tolerant soybean cultivars representing maturity groups III, IV and V were planted at dates representing the full-season and double-crop soybean production systems used in Virginia. Within each …
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Physiological effects of moisture stress, moisture stress conditioning, and leaf area manipulations on black alder seedlings (Alnus glutinosa (L.) Gaertn.)
… nodule sugar content, transpiration or leaf conductance; however, photosynthesis was significantly reduced. Only defoliations of 100% significantly lowered acetylene reduction. Defoliations of 45% caused increases in photosynthesis and transpiration of residual leaves three days …
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Validating Leaf Area Index (LAI) and canopy cover estimated from satellite imagery products with ground measurements in plum orchards, Western Cape
… performance, where accurate estimation of the Leaf Area Index (LAI) plays a central role in linking canopy structure to productivity. LAI is not only a key indicator of crop development and yield potential but also a critical input in biophysical and climatic models. However, direct measurement …
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Determination and Manipulation of Leaf Area Index to Facilitate Site-Specific Management of Double-Crop Soybean in the Mid-Atlantic, U.S.A.
… deficits common to the Mid-Atlantic USA. Leaf area index (LAI) is the ratio of unit leaf area of a crop to unit ground area and is a reliable indicator of leaf area development and crop biomass. An LAI of 3.5 to 4.0 by flowering is required to maximize yield potential. Soybean LAI will …
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Seasonal and Spatial Variation in Leaf Area Index, Litter Production, and Light Levels in Myrica Cerifera,Shrub Thickets Across a Barrier Island Chronsequence
Leaf area index (LAI), litter production and understory light levels of Myrica cergera shrub thickets were assessed on Hog Island, Virginia to quantify spatial and seasonal variations in leaf area and light attenuation among four thickets representing a successional chronosequence and compare …
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