and you may need to create a new Wiley Online Library account. the reflectance curves depend on leaf composition and orien-tation. Greening of young leaves was associated with decreases in both reflectance and transmittance in the middle wavelengths of the PAR region, while leaf senescence was associated with increases in both reflectance and transmittance, primarily in the longer wavelengths of the PAR region. Internal cell structur C. Equivalent water content D. All of these. Winter Cover Crops in Illinois: Evaluation of Ecophysiological Characteristics of Corn. A. Maize Morphophysiological Responses to Intense Crowding and Low Nitrogen Availability: An Analysis and Review. Greening of young leaves was associated with decreases in both reflectance and transmittance in the middle wavelengths of the PAR region, while leaf senescence was associated with increases in both reflectance and transmittance, primarily in the longer wavelengths of the PAR region. Learn about our remote access options, Dep. Financial support provided, in part, by the Ontario Ministry of Agric., Food and Rural Affairs, and the Natural Sciences and Engineering Res. Mcq Added by: Muhammad Bilal Khattak. of Canada. Working off-campus? Vegetation typically absorbs in the red and blue wavelengths, reflects in the green wavelength, strongly reflects in the near infrared (NIR) wavelength, and displays strong absorption features in wavelengths where atmospheric water is present. Leaves from six leaf positions were harvested on eleven dates between 55 and 134 d after planting. Genetic Variation in Physiological Discriminators for Cold Tolerance—Early Autotrophic Phase of Maize Development, https://doi.org/10.2135/cropsci1997.0011183X003700020022x. The Response of Leaf Photosynthesis and Dry Matter Accumulation to Nitrogen Supply in an Older and a Newer Maize Hybrid Thepurposeofthis workis to provide suchinformation forusein remotesensing andenergybalance studies. Leaf absorptance of incident photons in the PAR region by healthy, fully expanded leaves ranged from approximately 0.88 to 0.91; much lower values were observed for young, chlorotic, or senescing leaves. Green vegetation leaf reflectance primarily depends on several leaf parameters, such as the internal structural parameters of the leaf mesophyll, pigment content (e.g., Chl, carotenoid, and anthocyanin), leaf water content, and leaf dry matter content [13,14,15]. Our objectives were (i) to monitor changes leaf ahsorptance in a typical maize crop over the growing season, and (ii) to determine if absorptance of maize leaves could be accurately estimated with a SPAD 502 hand‐held chlorophyll meter (Minolta Corporation, Ramsey, NJ). IF YOU THINK THAT ABOVE POSTED MCQ IS WRONG. Use the link below to share a full-text version of this article with your friends and colleagues. Leaf reflectance depends primarily on_____? Regression analysis revealed a strong relationship (r2 = 0.98) between leaf absorptance and SPAD value, suggesting that the SPAD meter could be used to provide a rapid estimate of leaf absorptance in the field. Enter your email address below and we will send you your username, If the address matches an existing account you will receive an email with instructions to retrieve your username, © 2020 American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America, By continuing to browse this site, you agree to its use of cookies as described in our, Urban Agriculture & Regional Food Systems, Journal of Production Agriculture (1988–1999), I have read and accept the Wiley Online Library Terms and Conditions of Use.