Light interception of contrasting azimuth canopies under square and rectangular plant spatial distributions: simulations and crop measurements

Citation
G. Maddonni et al., Light interception of contrasting azimuth canopies under square and rectangular plant spatial distributions: simulations and crop measurements, FIELD CR RE, 70(1), 2001, pp. 1-13
Citations number
29
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Agriculture/Agronomy
Journal title
FIELD CROPS RESEARCH
ISSN journal
0378-4290 → ACNP
Volume
70
Issue
1
Year of publication
2001
Pages
1 - 13
Database
ISI
SICI code
0378-4290(20010401)70:1<1:LIOCAC>2.0.ZU;2-J
Abstract
Several studies have considered maize canopy as a homogeneous medium with a random leaf orientation distribution. Recent studies, however, have detect ed that maize leaf orientation in the horizontal plane (i.e., leaf azimuth distribution) can react filling empty spaces (e.g., intra-row or inter-row) due to plant spatial arrangement. "Rigid" genotypes present a random distr ibution of leaf azimuth, independent of planting pattern. "Plastic" genotyp es have the ability to modify leaf orientation. They generally present a ra ndom leaf azimuth distribution under square planting patterns, but tend to align their leaves perpendicularly to the row direction under rectangular p lanting patterns. We used three-dimensional models to reconstruct canopy ar chitecture, mimicking these two behaviors. We simulated mid-day (maximum su n elevation 79.4 degrees and 65.3 degrees) and daily light interception of fully developed canopies at various plant densities (3, 9 and 12 plants m(- 2)) and row spacings (0.35 and 0.70 m), and compared the results of these s imulations with data from a field experiment. Simulations and field measure ments showed that canopy behavior (plastic or rigid) has a significant (P < 0.05) effect on light interception. Plastic canopies in a rectangular plan t spatial distribution were able to increase (6-10% around mid-day), or mai ntain (during a day) similar light attenuation coefficients (k) to those un der square planting patterns. In rigid canopies, on the contrary, there was a reduction in k (10-12%) when grown under rectangular planting patterns, both at mid-day and during a day. Our results suggest that the plasticity o f maize canopy, based on leaf re-orientation, results in similar daily ligh t interception values in different inter-row distances. (C) 2001 Elsevier S cience B.V. All rights reserved.